Question about MAF readings ** Logs inside**

[RLB6]

This was a 3rd gear to 4th gear change. The MAF readings pegged at 229 g/s as it should but then when getting into 4th gear, while still WOT the MAF readings drop and never recover.

Is this normal or is my MAF on it's way out:

http://spreadsheets.google.com/pub?k...vTfHuQ5AxVjmeg

BTW, this is on B9 (holding at 21 PSI) T8, no meth on the REVO 550cc file.

[CO AVANT]

That last reading before the cf's drop back to 0 in 4th gear is just a result of letting off the pedal. I do not like that -9 right at the shift points on your BTDC's. When you shift your maf readings always drop back down and rise again once full boost/power is reached. At least in your tranny and setup it seems as if 3rd gear is your money gear for power. I think your logs look normal. Log block 031 with blocks 003 and 020 next time. I am seeing higher 4th gear MAF #'s on a 3" VR6 housing (1.8t sensor) at 5000ft ;) Also be aware that once cool weather hits again, those 4th gear MAF #'s will prolly be maxed out again at 229g/s.
I am surprised you can get away with running T8 down there on 91 without meth... humidity?

[mike-2ptzero]

Looks fine to me. The maf readings get right back to the same thing at the same rpm, it didn't reach 229 because you didn't even get to 5600 rpms where it hit 229 in 3rd gear.


If you look at your log you hit nearly the same maf readings at the same rpm in both 3rd and 4th gear.




5000
3rd gear = 199.11
4th gear = 196.14

5400
3rd gear = 219.06
4th gear = 213.94


CO AVANT - How do you get he is running 91 octane? He is in the north east in MD so I am sure he is running 93. I think you also missed the fact that he is "Tiptronic" so its not like he has to lift off the throttle during a shift. LOL

But the maf readings will still drop because the rpms do drop and that means the amount of exhaust flow also decreases.

[CO AVANT]

oh yeah, forgot he is TIP. Just guessed on the 91oct. I have never filled up on the east coast so I have no clue what grade of gas they get out there. anything else you want to try to tear apart with my response mike-2ptzero?

[mike-2ptzero]

Didn't know east coast didn't have 91. Are you a noob now?

[CO AVANT]

What are you talking about? I thought 91 was the norm for premium in most places (like most of the midwest/west). Do they offer 91 out there too or is it just 93? I don't really travel to the east coat like I already said, so I really don't know... Only reason I can see as to why no one in the western region gets 93 as the norm is because of the higher elevations...

[dougyfresh]

We have 91 out here. Just hard to find. I can find it at some Sunoco and BP stations. Most stations carry 87, 89 and 93.

I remember seeing 85 in CO

[CO AVANT]

Yeah higher you go in elevation the less octane is required. I feel they aim that more toward NA over FI though. You can increase timing by a few deg more (~+3-4) at 5000ft compared to sea level on your typical 1.8T setup. I would love to see 93 at the pump out here lol! Only one station within a 40 mile radius of me sells 93... Berthoud CO, same place I took your fmic to....to find out it was shut down

[mike-2ptzero]

Well seeing that 99.9% of the car owners up at 5000 ft dont do their own tuning of their cars to take advantage of higher octane, so there isn't a point for it.

[CO AVANT]

very true Mike, 93 is pretty pointless out here for most applications. Certain engines/computers can adapt to a certain extent though. Not fully optimal but still make more power. My buddy saw significant gains on his R6 just by filling up a tank with the 104 without any program changes...

[F16HTON]

Back off to timing 7 and you will see more power. If you look at your BTDC readings when there is CF you are pulling timing. The goal is to add as much timing as possible and get no pull whatsoever.

[RLB6]

I forgot to mention that I'm running 93 octane. It's available anywhere in the mid-atlantic Jordan . Sorry that I didn't specify that. Oh yeah, and I'm tiptronic so there's no need to lift of the throttle in between shifts

You're right Mike, I didn't get back to that RPM range because I was running outta road but I'll try to duplicate what I did in 3rd gear. Logically, it looks like I would get back to 229 g/s.

Taking Gregg's advice and stepping down the timing to 7 on the SPS and see if that get's me more umph!

Thanks guys.

BTW, a T8 setting was not nearly as possible with the 440 file, running just on 93 octane. REVO 550 file FTW!

[RLB6]

Back off to timing 7 and you will see more power. If you look at your BTDC readings when there is CF you are pulling timing. The goal is to add as much timing as possible and get no pull whatsoever.

What's the max boost you would run on the 71R elim with 93 octane, regardless of timing. I've heard that the GTRS and the 71R elim. max out efficiency a t the same boost range. I doubt that. I'm sure the 71R can be dialed in for more boost and still be efficient.

I'm asking these "noob" questions because at first I wasn't able to take advantage of all the pontential power of an eliminator kit. I have changed up some hardware and now I can take advantage of it's full potential but wanna see if I can squeeze a bit more outta her.

[CO AVANT]

well I know my gtrs was "maxed out" up here. I know most guys say you make your most power on ~21-22psi, but after doing two different dyno runs back to back I was making more power on 23psi than 21psi. Car runs much more optimal on the lower boost setting though since anything over ~20psi and you're just pushing more and more hot air. My full T25 2871R spikes higher boost at the same 85 duty setting on the ebc (25psi vs. 22psi on gtrs). Don't know if the choked 71R elim could do the same though as the hardware configuration and sizing is different...

[RLB6]

well I know my gtrs was "maxed out" up here. I know most guys say you make your most power on ~21-22psi, but after doing two different dyno runs back to back I was making more power on 23psi than 21psi. Car runs much more optimal on the lower boost setting though since anything over ~20psi and you're just pushing more and more hot air.

That 23 PSI was on race gas, correct and not 91 oct.?

[F16HTON]

Jordan is 100% correct...

I do make more power on 25psi than on 22 psi, but 22psi is all around better for me because the IATs are much lower.

The air up in Colorado has the basically same oxygen ratio as it does at sea level, however the atmospheric pressure is much less...the turbo is an equalizer but it can never make up all of the difference...

The bottom line is that at altitude, you need to make up 2psi right out of the gate and you will never be able to catch up to the pressures of sea level...

IMO Jordan has done all of the correct modifications to make his car run as well as it can at altitude...

[A4 TSCHUSS]

WTF, how are you running T8 my car would have pinged to death at even T7 with the meth off.

[RLB6]

WTF, how are you running T8 my car would have pinged to death at even T7 with the meth off.

You need to dump that 440 file and get with the 550 file hotness son! . Imagine what you could do with a 550 file PLUS meth PLUS lemmi

[A4 TSCHUSS]

yes but your timing is that of like T6 while you are on T8 since it starts pulling timing And I will have a GT30 file soon

[RLB6]

And I will have a GT30 file soon

Well hopefully, you won't get plagued like everyone else in the 2.0 realm. I wish you luck on that endeavor.

BTW, that log was done in 90 deg weather.

[A4 TSCHUSS]

im not doing 2.0 but I will be putting in pauter rods, new rod bearings, AEB forged pistons and new piston rings.

[CO AVANT]

You should get the pauter rods with the forced pin oiling David

yes those dyno's were on 104oct like all my dyno's...but like Greg said, I lose pressure up here....race gas up here runs like 91oct at sea level....at least that is what my butt dyno tells me.

[A4 TSCHUSS]

I already have the rods and pistons but didnt get that option, didn't really look into it, o well....

[mike-2ptzero]

I already have the rods and pistons but didnt get that option, didn't really look into it, o well....

It isn't a big deal, I dont have that option on my pauters and have been running the same ones for 6 years now. Best thing you can do is to make sure you use coated bearings.

[A4 TSCHUSS]

yeah I will be getting those. Trying to decide if I want to just get OEM std. rings or get some file fit rings. Im thinking the OEM rings would do fine and I wouldnt have to worry about the tedious process of filing them and fitting them in the cylinder to check the end gap with feeler gauge then filing more or whatever.

[dougyfresh]

Well hopefully, you won't get plagued like everyone else in the 2.0 realm.

Now, now!





Please post up when you go T7. I'm curious to see the differences.

[RLB6]

Now, now!





Please post up when you go T7. I'm curious to see the differences.

Ooops. Sorry, you're still up and running. . I'm gonna do some runs tomm. on T7.

[dougyfresh]

Ooops. Sorry, you're still up and running. . I'm gonna do some runs tomm. on T7.

Haha. I'll forgive you.

Oh, my rear view mirror boost gauge is almost done. I'm halfway through. Got the fine detail work to finish up. Looks good . Can't wait to have a mirror back in my car. Driving without one is like driving a moving van.

[RLB6]

Haha. I'll forgive you.

Oh, my rear view mirror boost gauge is almost done. I'm halfway through. Got the fine detail work to finish up. Looks good . Can't wait to have a mirror back in my car. Driving without one is like driving a moving van.

Sweet. Everyone who's seen it, loves it. They think that it's a factory option

[wolfdog]

Oh, my rear view mirror boost gauge is almost done. I'm halfway through. Got the fine detail work to finish up. Looks good . Can't wait to have a mirror back in my car. Driving without one is like driving a moving van.

and illegal if I'm not mistaken. it's a good thing your boost is turned down so the men in blue don't need to take a closer look at you.

[mike-2ptzero]

and illegal if I'm not mistaken. it's a good thing your boost is turned down so the men in blue don't need to take a closer look at you.

Nope, it is illegal to have no outside mirror on the driverside.

[dougyfresh]

Nope, it is illegal to have no outside mirror on the driverside.

I used to get harrassed for that all the time with my Jeep since I always took the doors and mirrors off. Mirrors tend to find trees while on the trail.

[mtbrider]

RLB6 you should come down to the DIY day (see regional section) so that we can compare set-ups. I remember that you wanted to do that.

[RLB6]

RLB6 you should come down to the DIY day (see regional section) so that we can compare set-ups. I remember that you wanted to do that.

Didn't know about that. I'll look for it in the regionals.