Sprint booster for RS4

[zachf88]

My brother just got a sprint booster for his ML63 and it made a HUGE difference in throttle response. I was wondering if they made one for the RS4 and where can I buy one?

[KevinS4]

I know PG performance carries them.
talk to Kendall tell her Kevin sent you.
[email protected] or 888-806-7978

[zachf88]

Thanks Kevin, I just emailed her! I think I've talked with her before when I ordered parts for my GTi back in 03

[beung]

If this is what I think it is, it sonds like the "sport" button that was in my E46 M3....

It didn't give you more HP or anything like that it just ramped up the fly by wire throttle. Basically making the throttle more sensative, if you had your foot at 10% throttle, this will make it lets say 25% instead?

[ABT B7]

I am sure they make one for RS4, I know for sure they have one for S4... PG Performance in Surrey is a good place to contact, both Kendall and Paul Jr. are very nice. Let us know what you think if you decided to install it.

[zachf88]

I definitely want one. I've always driven cars with software (Dinan BMW's) and I got use to the great throttle response. I'm only looking for an increased throttle response. I don't need any more power or a voided warranty so software is out of the picture.... I'm just waiting to hear back from Kendall

[khyber]

For some reason I keep thinking I've read somewhere that since the throttle is electronic you can actually adjust the sensitivity with a vag com? I keep trying to find more info on it but now I can't. Maybe this is just what you're looking for? If anyone has any info on that (not to threadjack), I'd love to know.

[KevinS4]

No problem. I deal with Kendall often. I'm sure you'll hear from her soon.

[b spot]

The throttle response on S4's is ass. (No RS4 experience, not sure if it's similar). Even with software (APR) I find it's brutally inconsistent and the throttle by wire system is the one thing I hate about these cars. Whoever programmed it did a really really bad job.

[zachf88]

Damn PGperformance shipping policy.... The shipping address has to match your billing address.... I'm in Canada on a student visa and I can't get credit while I'm in Canada (or I would be kicked out of the country) but I pay for everything using my American credit card and bank card. So I have to find a friend to accept the package in the states and have it shipped back to canada (another $22 and 10 business days) so it'll be at least 17-20 business days before I receive it. So messed up! Sorry, had to rant....

[cit1991]

The sport button already does this.

[KevinS4]

Damn PGperformance shipping policy.... The shipping address has to match your billing address.... I'm in Canada on a student visa and I can't get credit while I'm in Canada (or I would be kicked out of the country) but I pay for everything using my American credit card and bank card. So I have to find a friend to accept the package in the states and have it shipped back to canada (another $22 and 10 business days) so it'll be at least 17-20 business days before I receive it. So messed up! Sorry, had to rant....

Ask if she can ship it to me. I would be more then happy to reship it to you.

[zachf88]

The sport button already does this.

not quite.... sprint booster will improve throttle response even more (maybe even 3x what the sport button does) but i'll let you guys know in a month!

[ABT B7]

Ask if she can ship it to me. I would be more then happy to reship it to you.

I am willing to do the same. I dealt with them before too.

[Shomegrown]

What a stupid mod.

It doesn't make your car faster. If you want more power, push the gas down more. That's what it's for.

[zachf88]

What a stupid mod.

It doesn't make your car faster. If you want more power, push the gas down more. That's what it's for.

As I mentioned before, I DO NOT want more power, I just need better throttle response. Audi has horrible throttle delay and Halifax is very hilly (I moved here from a very flat place)


Thanks guys for the offer.... I think I can get my parents to ship it back to me but I really appreciate it!!

[ABT B7]

What a stupid mod.

It doesn't make your car faster. If you want more power, push the gas down more. That's what it's for.

Throttle response does not equal power. You will get INSTANT throttle response time with this mod and go faster and also handles better in comparison with more HP.

[ABT B7]

As I mentioned before, I DO NOT want more power, I just need better throttle response. Audi has horrible throttle delay and Halifax is very hilly (I moved here from a very flat place)


Thanks guys for the offer.... I think I can get my parents to ship it back to me but I really appreciate it!!

Hey no worries Zachf88, that's what AZ is here for.

[Shomegrown]

Throttle response does not equal power. You will get INSTANT throttle response time with this mod and go faster and also handles better in comparison with more HP.

Handle better, WTF are you talking about?

It won't make any reasonable change in "throttle response".

It just makes the car more touchy/jumpy...and actually MORE difficult to handle (and modulate power) at the limit.

Ideally, you want a long travel linear gas pedal with small throttle inputs equalling small changes in torque delivery.

There is a map in the Motronic ECU that changes the "relative torque request". Tuners could do the same thing that this doohicky does for free.

They don't. Why? Because it isn't a great idea.

[zachf88]

Handle better, WTF are you talking about?

It won't make any reasonable change in "throttle response".

It just makes the car more touchy/jumpy...and actually MORE difficult to handle (and modulate power) at the limit.

Ideally, you want a long travel linear gas pedal with small throttle inputs equalling small changes in torque delivery.

There is a map in the Motronic ECU that changes the "relative torque request". Tuners could do the same thing that this doohicky does for free.

They don't. Why? Because it isn't a great idea.

Do you have one or have you tried one out? Seriously!

As stated earlier, I'm use to instant "jumpy" throttle response. I also use to race open wheel karts and they were drive by wire. I want my RS4 to have the same response.

[Shomegrown]

Do you have one or have you tried one out? Seriously!

No, and I don't have to because I know how a DBW system works. All this device does is reduce your throttle resolution and give the illusion of better throttle response.

As stated earlier, I'm use to instant "jumpy" throttle response.

Fine, have fun with it. It makes no sense IMO.

I also use to race open wheel karts and they were drive by wire.

What does that have to do with anything? That's like saying "I used to race open wheel karts and they had 4 wheels. I want my RS4 to handle like that". Every drive by wire system has different response time and resolution which is determined by the hardware and the ECU coding.

[zachf88]

No, and I don't have to because I know how a DBW system works. All this device does is reduce your throttle resolution and give the illusion of better throttle response.



Fine, have fun with it. It makes no sense IMO.




What does that have to do with anything? That's like saying "I used to race open wheel karts and they had 4 wheels. I want my RS4 to handle like that". Every drive by wire system has different response time and resolution which is determined by the hardware and the ECU coding.

I meant drive by throttle cable (like older cars....) But just please stop wasting every bodies time and STOP posting in this thread. Thanks

Kendall never emailed me back today as she said she would.... how nice

[Shomegrown]

I meant drive by throttle cable (like older cars....) But just please stop wasting every bodies time and STOP posting in this thread. Thanks

Kendall never emailed me back today as she said she would.... how nice

Shave your pubes. You might be able to convince women your junk is longer.

It's the same concept.

[zachf88]

that was totally uncalled for! I asked you nicely to stop posting, so please don't post. I do not want this thread to become into a huge argument/disagreement.

Also, your post make no sense..... All I want is for my car to have a more sensitive throttle to make it easier to go up hills and to heel-and-tow without having to ride the clutch or what-not. I drove my brother's ML63 and it made a HUGE difference in throttle response.

I'll be the guinea pig and buy this product and see what it does. and for the last time, I'M NOT LOOKING FOR MORE POWER, I Just want a more sensitive throttle!

[ieatfishburitos]

too lazy to push the pedal down further? I just don't get it. You. Could wire up a two position switch and have throttle either 0 or 100%. Real drivers want more resolution which gives more control. If you have problems with hills depress the throttle more. Heck maybe you could hire a servant to lay on your floorboard and push on your foot when you approach a hill.

[cit1991]

Sport removes the damping/delay from the response. Only the ECU can do that. Conversion of the pedal signal cannot.

90% torque at 35% pedal travel, and no delay...More? You really want it to be like a 2-stroke, on/off?

[Shomegrown]

that was totally uncalled for! I asked you nicely to stop posting, so please don't post. I do not want this thread to become into a huge argument/disagreement.

Also, your post make no sense..... All I want is for my car to have a more sensitive throttle to make it easier to go up hills and to heel-and-tow without having to ride the clutch or what-not. I drove my brother's ML63 and it made a HUGE difference in throttle response.

I'll be the guinea pig and buy this product and see what it does. and for the last time, I'M NOT LOOKING FOR MORE POWER, I Just want a more sensitive throttle!

You're such a baby Zachster.

You want to make it easier to go up hills? Are you too lazy to push the gas pedal down far enough?

It has nothing to do with the clutch.

What makes this thing stupid is that you get all your power in the first half of the accelerator travel. Then the last half does basically nothing.

It also won't make the car any more responsive when you floor the pedal. It only "pretends" you're giving it 50% throttle when you're actually giving it 25% throttle.

Well, if 50% is what you want, why not just save the $100 and actually push the accelerator halfway down?

And read the post above mine, he's right. Sport mode already does what you're asking.

[zachf88]

I'm only looking for the throttle response to be quicker. IE, NO DELAY WHEN I PUSH THE PEDAL. When I received software on my previous cars, there was no delay between when I pushed the peddle and the rpm change. The RS4 has a big delay between the time the pedal is tapped and the rpms climb. Pushing the pedal harder would only cause the RPM's to jump higher. Thank you for ruining a good thread! But whatever, I'm not going to argue with you. I have better things to do with my time. Anyway, It's my car and my money - not yours. I'll buy this thing and hope it's what I'm looking for. If not, then oh well.

Also, the sport button on the US-spec RS4 only opens up the exhaust valve.

The exhaust valve is closed in 1st,2nd, and 3rd gear until a certain rpm. the sport button opens the flap at all rpms in all gears.

*Edit* Kind of funny though, I just went through the whole thread and read each post.... almost every post you made shomegrown, you have used callous name calling or insulting comments, but I didn't respond with any ugly, demeaning comments. I was a gentleman; responded nicely and asked you kindly to stop posting in this thread. So please, grow up!

[Shomegrown]

I'm only looking for the throttle response to be quicker. IE, NO DELAY WHEN I PUSH THE PEDAL. Pushing the pedal harder would only cause the RPM's to jump higher. Thank you for ruining a good thread!

Reading your post makes me think you don't understand what the device is doing.

It's your money, and if you're happy with it...that's all that counts.

Keep in mind that it could void your powertrain warranty.

[zachf88]

I can easily take the device out and the dealer would never know! That's one of the main reasons why I want to do this.

[khyber]

I'm only looking for the throttle response to be quicker. IE, NO DELAY WHEN I PUSH THE PEDAL. When I received software on my previous cars, there was no delay between when I pushed the peddle and the rpm change. The RS4 has a big delay between the time the pedal is tapped and the rpms climb. Pushing the pedal harder would only cause the RPM's to jump higher. Thank you for ruining a good thread! But whatever, I'm not going to argue with you. I have better things to do with my time. Anyway, It's my car and my money - not yours. I'll buy this thing and hope it's what I'm looking for. If not, then oh well.

Also, the sport button on the US-spec RS4 only opens up the exhaust valve.

The exhaust valve is closed in 1st,2nd, and 3rd gear until a certain rpm. the sport button opens the flap at all rpms in all gears.

*Edit* Kind of funny though, I just went through the whole thread and read each post.... almost every post you made shomegrown, you have used callous name calling or insulting comments, but I didn't respond with any ugly, demeaning comments. I was a gentleman; responded nicely and asked you kindly to stop posting in this thread. So please, grow up!

+1. If anyone here drives an S or RS4, and says they don't feel a slight delay when they're cruising to when they depress the pedal more, clearly doesn't drive their car enough. Or they have some kind of factory freak. I definitely know exactly what you're talking about, And it is definitely a huge complaint of mine. My only argument to this issue though, is that I think a lot of it also has to do with the weight transfer when you do it. I'm not saying that's the entire problem, I'm saying I think that's part of it. As far as I know there is no snub mount for the RS4, but in the S I know it made a huge difference in that responsiveness, or at least the feel of that responsiveness. I think that the mushy stock snub mount give the engine/transmission a lot of play. I especially noticed this because my snub mount actually shattered and slowly fell to pieces leaving essentially nothing there . After that happened, I noticed what seemed like a HUGE delay in throttle responsiveness but in actuality wasn't the throttle being unresponsive, it was the engine and/or transmission shifting after depressing the throttle.

Now I see both sides of this argument and both make sense. But I don't think you guys are arguing the same thing. There is a difference between the throttle responsiveness that Zachf88 is saying he wants and the type of programming you all are speaking of. Although, you could argue that what you guys speak of would actually partially help solve this problem. If you wanted it to be quicker, and half the input would produce double the power, would that not be quicker? Whether it's marginal or not. Personally I like things to be touchier. The way I see it, the softer (softer meaning the more spaced out the throttle inputs are) it is, the harder it is to consistently rev match, or in general just predict where your tach is going to land. I (and as many people have stated also) have a very hard time driving my S4 perfectly. If you think the throttle on the S or RS4 is perfect, good for you, but I respectfully disagree, and think that many other S and RS drivers would too.

[Shomegrown]

*Edit* Kind of funny though, I just went through the whole thread and read each post.... almost every post you made shomegrown, you have used callous name calling or insulting comments, but I didn't respond with any ugly, demeaning comments. I was a gentleman; responded nicely and asked you kindly to stop posting in this thread. So please, grow up!

I'm sure your mother is very proud.

+1. If anyone here drives an S or RS4, and says they don't feel a slight delay when they're cruising to when they depress the pedal more, clearly doesn't drive their car enough. Or they have some kind of factory freak. I definitely know exactly what you're talking about, And it is definitely a huge complaint of mine. My only argument to this issue though, is that I think a lot of it also has to do with the weight transfer when you do it. I'm not saying that's the entire problem, I'm saying I think that's part of it. As far as I know there is no snub mount for the RS4, but in the S I know it made a huge difference in that responsiveness, or at least the feel of that responsiveness. I think that the mushy stock snub mount give the engine/transmission a lot of play. I especially noticed this because my snub mount actually shattered and slowly fell to pieces leaving essentially nothing there . After that happened, I noticed what seemed like a HUGE delay in throttle responsiveness but in actuality wasn't the throttle being unresponsive, it was the engine and/or transmission shifting after depressing the throttle.

Now I see both sides of this argument and both make sense. But I don't think you guys are arguing the same thing. There is a difference between the throttle responsiveness that Zachf88 is saying he wants and the type of programming you all are speaking of. Although, you could argue that what you guys speak of would actually partially help solve this problem. If you wanted it to be quicker, and half the input would produce double the power, would that not be quicker? Whether it's marginal or not. Personally I like things to be touchier. The way I see it, the softer (softer meaning the more spaced out the throttle inputs are) it is, the harder it is to consistently rev match, or in general just predict where your tach is going to land. I (and as many people have stated also) have a very hard time driving my S4 perfectly. If you think the throttle on the S or RS4 is perfect, good for you, but I respectfully disagree, and think that many other S and RS drivers would too.

That's what Zach doesn't seem to understand. Any "delays" in the system will still be there. That's coded into the ECU and you're not changing that.

If you floor the car quickly, the throttle will open nearly instantly. That's as quickly as the system can possibly respond, adding this device won't change anything.

So take your pick, open the throttle quickly halfway down or buy this device and open the throttle 25% or so. It will have the same effect.

I would hate to see someone waste their money on this thinking it would solve the DBW issues in these cars. That's programming and emission related. A full chip is your best option there.

[ABT B7]

Handle better, WTF are you talking about?

It won't make any reasonable change in "throttle response".

It just makes the car more touchy/jumpy...and actually MORE difficult to handle (and modulate power) at the limit.

Ideally, you want a long travel linear gas pedal with small throttle inputs equalling small changes in torque delivery.

There is a map in the Motronic ECU that changes the "relative torque request". Tuners could do the same thing that this doohicky does for free.

They don't. Why? Because it isn't a great idea.

You will have better handle if you are capable of doing it since you will have 100% control of the throttle without any delay. If you disagree I respect your opinion but please don't dis other people's opinion and be respectful. Also people are looking for different things for their cars. If you don't like it, keep your mouth shut and move on, if you like it, kindly compliment on it. We don't want to see any arguments going on in the thread that's unrespectful, and it is wasting people's time. It's other people's hard earned money and they can do whatever they want to it. Seriously you can't tell people where to spend (or not to spend) their money because you don't have the right to! At the end of the day, they are paying for it not you!!

Zachf88, I know PG Performance offers 30 day money back on that product, so if you don't like it you can return it to them and get that refunded. You may want to check with them on that since you are not from Vancouver locally.

[sammyrusso]

my last car was e46 m3 and i tell you when i out that thing in sport mode felt like another beast..took me a lil to get used to it..was so sensitive at first the car would shake back and forth cause wasnt used to it...now in my rs4 am kinda dissapointed...i dont feel any real difference in sport mode...sometime i think the only difference is in my head...someone above said there is no diff in usa model...so i say props to you...let me know if it is any good

[Shomegrown]

You will have better handle if you are capable of doing it since you will have 100% control of the throttle without any delay. If you disagree I respect your opinion but please don't dis other people's opinion and be respectful. Also people are looking for different things for their cars. If you don't like it, keep your mouth shut and move on, if you like it, kindly compliment on it. We don't want to see any arguments going on in the thread that's unrespectful, and it is wasting people's time. It's other people's hard earned money and they can do whatever they want to it. Seriously you can't tell people where to spend (or not to spend) their money because you don't have the right to! At the end of the day, they are paying for it not you!!

Zachf88, I know PG Performance offers 30 day money back on that product, so if you don't like it you can return it to them and get that refunded. You may want to check with them on that since you are not from Vancouver locally.

So you're saying that we shouldn't warn people not to buy products that won't solve their problem?

Interesting.

Well, SWEET BRAH, HOOK UR RIDE UP WITH DAT IM SURE IT WILL BE WAY BETTAH.

[khyber]

I'm sure your mother is very proud.




That's what Zach doesn't seem to understand. Any "delays" in the system will still be there. That's coded into the ECU and you're not changing that.

If you floor the car quickly, the throttle will open nearly instantly. That's as quickly as the system can possibly respond, adding this device won't change anything.

So take your pick, open the throttle quickly halfway down or buy this device and open the throttle 25% or so. It will have the same effect.

I would hate to see someone waste their money on this thinking it would solve the DBW issues in these cars. That's programming and emission related. A full chip is your best option there.

Ok, well in response to that, why won't it solve the problem? And if it won't, do you know anything that will? I don't know what this product does behind the scenes, I've just heard what it's supposed to do for the most part. And to me it sounds like it may be the solution. Hard to say but to some it may be worth trying (it probably would be to me if I were better off and could justify making the purchase). I mean obviously there must be some way to cure this if other cars with similar systems work very well? I'm just wondering what you can do to fix it?

Well, SWEET BRAH, HOOK UR RIDE UP WITH DAT IM SURE IT WILL BE WAY BETTAH.

I can definitely say I actually laughed out loud for that.

[ABT B7]

So you're saying that we shouldn't warn people not to buy products that won't solve their problem?

Interesting.

Well, SWEET BRAH, HOOK UR RIDE UP WITH DAT IM SURE IT WILL BE WAY BETTAH.

Yes you should, but like I said, everyone has different opinions on what works and what not. Its not your money they are spending! So MOVE ON!

[ieatfishburitos]

You will have better handle if you are capable of doing it since you will have 100% control of the throttle without any delay.

I respectfully disagree with your statement. If you've ever driven a car on a track you surely understand when pushing a car through corners, a very slight difference between how much throttle is applied is the difference between losing control or going very fast through the corner. Effectively the change you are talking about removes the finite control of the throttle for more of an all or nothing approach.

I'm not sure how I can better explain it to you, but imagine having 900 hp and your throttle hooked up to a on/ off switch. It would work fine for a straight away, but if you turned off the switch entering a corner and turned on the switch mid corner your car would spin out of control. That is an exaggerated example to explain the loss in resolution or granularity you are proposing.

It's basic electronics which explain the loss in resolution. If you consider a analog to digital converter, it samples the analog signal at say 12Khz, or 12000 times per second. There is a lot of information that exists between the sampling periods that is then ignored. If you sample the information at 96Khz or 96000 times per second, your signal will sound much better and closer represent the "real" signal. The analogy is similar to what you are proposing doing, you'd rather have fewer throttle positions that start at a higher value, instead of having access to a full range of positions.

[ABT B7]

I respectfully disagree with your statement. If you've ever driven a car on a track you surely understand when pushing a car through corners, a very slight difference between how much throttle is applied is the difference between losing control or going very fast through the corner. Effectively the change you are talking about removes the finite control of the throttle for more of an all or nothing approach.

I'm not sure how I can better explain it to you, but imagine having 900 hp and your throttle hooked up to a on/ off switch. It would work fine for a straight away, but if you turned off the switch entering a corner and turned on the switch mid corner your car would spin out of control. That is an exaggerated example to explain the loss in resolution or granularity you are proposing.

It's basic electronics which explain the loss in resolution. If you consider a analog to digital converter, it samples the analog signal at say 12Khz, or 12000 times per second. There is a lot of information that exists between the sampling periods that is then ignored. If you sample the information at 96Khz or 96000 times per second, your signal will sound much better and closer represent the "real" signal. The analogy is similar to what you are proposing doing, you'd rather have fewer throttle positions that start at a higher value, instead of having access to a full range of positions.

You have a very good point here. I agree with you. However, I think theoretically if you gain more control of the throttle body, the reaction time between the car and your command would be shorten; therefore, you should be going quicker cornering at the same limit. Without going through the route of gaining more power, I think gaining the throttle response time is a good way to go. Fast cars are not easy to drive, driver is a big element in this issue. I probably should of worded my statement differently than what I have stated.

But I do agree with your point respectfully and you have a very good argument there as well.

[PenguiN]

How does it feel when your brother beats you in his SUV? haha... I saw the RS4 get pooped on by the ML63. Fast ass car!