Can cruise control remain constant with a MBC?

[absolutegtr]

Ever since I installed my MBC, it seems as though cruise control cannot maintain speed going up a hill. After searching the little threads that came up....its seems as though this is what to expect with a MBC, correct?

Its not just cruise control though....As a driver I cannot regulate boost what-so-ever. Its either no boost or all boost. Obviously I am bypassing the N75 completely with the MBC (N75 is still plugged in though). Its not just going up a hill though, I cannot, for example, 30% throttle. Its getting real frustrating!

i know others have MBC's...does your car have this probelm? Or do you just live with it?

[Audi Skate Snow]

when I had my MBC before EBC, this was never an issue for me.

[absolutegtr]

when I had my MBC before EBC, this was never an issue for me.

Did you run the MBC in-line with the N75 or just by itself?

Also (like i said I am running just MBC the N75 is by itself but still plugged in).....do I need to close the other two ports on the N75? Or can they just vent to the atmosphere?

[widgget]

Did you run the MBC in-line with the N75 or just by itself?

Also (like i said I am running just MBC the N75 is by itself but still plugged in).....do I need to close the other two ports on the N75? Or can they just vent to the atmosphere?

ordered my MBC today so i can't comment on how well it functions with cruse control. you should leave the N75 connected to the TIP and then loop a small section of hose to the other two ports. if you don't do this your going to be sucking in unfiltered air, not allot but it doesn't take much sand to ruin your day.

[absolutegtr]

ordered my MBC today so i can't comment on how well it functions with cruse control. you should leave the N75 connected to the TIP and then loop a small section of hose to the other two ports. if you don't do this your going to be sucking in unfiltered air, not allot but it doesn't take much sand to ruin your day.

thanks, i guess i will have to do that....but obviously that wont fix the problem, lol.

its clear that the n75 controls boost...but why would I have this problem when others dont?

[mike-2ptzero]

when I had my MBC before EBC, this was never an issue for me.

Less of an issue with the larger turbos, more of an issue with a K03/K04 since the turbo spools up so quickly and this causes surging issues. This even becomes an issue with a mbc and K03/K04 while trying to hold part throttle going up a hill, the wg just becomes an on/off switch. Basically K03/K04 + MBC is a NO go.

[actlsub9]

Its not just going up a hill though, I cannot, for example, 30% throttle. Its getting real frustrating!

There is no part throttle boost with an MBC. The wastegate will not be opened until you reach your set boost.

N75 FTW

[Audi Skate Snow]

you should leave the N75 connected to the TIP and then loop a small section of hose to the other two ports. .

this is how I ran my MBC as well.

[sean1.8t]

There is no part throttle boost with an MBC. The wastegate will not be opened until you reach your set boost.

N75 FTW

BT with no n75 and MBC.

no problem with part throttle, you just have to be light on your lead foot. also no problem with my cruise.

[mike-2ptzero]

BT with no n75 and MBC.

no problem with part throttle, you just have to be light on your lead foot. also no problem with my cruise.

Yes because it is not a problem with a BT, its only a problem with a K03/K04 because you basically breath on the K03/k04 and it hits full boost.

[sean1.8t]

Yes because it is not a problem with a BT, its only a problem with a K03/K04 because you basically breath on the K03/k04 and it hits full boost.

yes i know.

i was just confirming your point and showing greg that there is partial boost with standalone MBC setups

[mike-2ptzero]

Ok. I think the only thing that works well with the n75 is the K03/K04, after that point a EBC is the best choice.

[actlsub9]

yes i know.

i was just confirming your point and showing greg that there is partial boost with standalone MBC setups

Different strokes for different folks.

Unless I intend to boost over MAP limit, then its n75 for me.

[mike-2ptzero]

Different strokes for different folks.

Unless I intend to boost over MAP limit, then its n75 for me.

You would be suprised at how much better the power band feels with a EBC vs a N75, even when running under 21psi.

[absolutegtr]

Mike, that's what I figured... Guess I am SOL until I go bigger, eh?

Is it possible for me to run the MBC online or in conjuction with the N75?

Thanks guys

[old guy]

Mike, that's what I figured... Guess I am SOL until I go bigger, eh?

Is it possible for me to run the MBC online or in conjuction with the N75?

Thanks guys

Clicky click

[absolutegtr]

Oldguy, thanks...... Again, LOL

That was the exact thread I was looking for!

One last question: after running the MBC in parallel will I have to reconfigure it? Or will it retain the current boost pressure I am seeing now?

[old guy]

Oldguy, thanks...... Again, LOL

That was the exact thread I was looking for!

One last question: after running the MBC in parallel will I have to reconfigure it? Or will it retain the current boost pressure I am seeing now?

The N75 will control the boost. The MBC will clip any spikes if it is set below the N75 threshold. If the MBC is set above the N75 then the N75 will control the maximum boost.

[absolutegtr]

The N75 will control the boost. The MBC will clip any spikes if it is set below the N75 threshold. If the MBC is set above the N75 then the N75 will control the maximum boost.

Just to clarify, I have the MBC set to 16psi....so the N75 will limit me to stock settings (~10psi)?

[old guy]

Just to clarify, I have the MBC set to 16psi....so the N75 will limit me to stock settings (~10psi)?

If you are running stock tuning with the N75 you will be limited to around 11 psi. Having the MBC set at 16 but run in parallel with the N75 will not raise the boost any. The N75 is going to clip it at 11psi. Now if you were running some other tune that was causing a nasty spike that you wanted to control, running the MBC in parallel would be a way to control it by capping the maximum boost. For example, running a K04 with the 1+ (FXK03) file will cause a wicked spike. You could control this running the N75 and capping the boost with the MBC. (Not that i am recommending this set up!)

[absolutegtr]

If you are running stock tuning with the N75 you will be limited to around 11 psi. Having the MBC set at 16 but run in parallel with the N75 will not raise the boost any. The N75 is going to clip it at 11psi. Now if you were running some other tune that was causing a nasty spike that you wanted to control, running the MBC in parallel would be a way to control it by capping the maximum boost. For example, running a K04 with the 1+ (FXK03) file will cause a wicked spike. You could control this running the N75 and capping the boost with the MBC. (Not that i am recommending this set up!)

I see, I see

See I am on the stock software. I did the "diode mod" about a week or two ago. I guess I am SOL until I go bigger and actually get a file.

Thing is there are plently of VW's and B5's doing this diode mod. Car runs great and finally has some balls, lol. Its just partial throttle that kills the car/ride/drive.

[sean1.8t]

You would be suprised at how much better the power band feels with a EBC vs a N75, even when running under 21psi.

plus i like the added benefit of controlling boost to exactly where i want it.

no spikes, and no suprises.

the n75 was intended for stock cars

[old guy]

I didn't realize that you were running the "diode" mode so I'm not really sure what would happen if you ran the MBC and N75 in parallel. If I understand the diode mode correctly you are "fooling" what the ECU sees from the MAP sensor and consequently raising the boost. Having no experience with the diode mode I don't know how far you can "fool" the ECU into raising the boost. I would think running the N75 would help reduce the on-off effect you get from just running the MBC and you could still use the MBC to cap the maximum boost so you don't fry your motor when you start to lean out from insufficient fueling.

[absolutegtr]

I didn't realize that you were running the "diode" mode so I'm not really sure what would happen if you ran the MBC and N75 in parallel. If I understand the diode mode correctly you are "fooling" what the ECU sees from the MAP sensor and consequently raising the boost. Having no experience with the diode mode I don't know how far you can "fool" the ECU into raising the boost. I would think running the N75 would help reduce the on-off effect you get from just running the MBC and you could still use the MBC to cap the maximum boost so you don't fry your motor when you start to lean out from insufficient fueling.

Thanks oldguy, I will give it a try tomorrow.

Lets hope the motor doesnt run lean now, lol...I've been logging and everything seems to be doing alright

I see it as the diode mod is the same as Stage 1 (stock injectors)

[texasboy21]

ive got the diode mod and its the same. its gotten a little better since ive fine tuned the mbc's spike and course boost.

barrett

[audikid66]

will it be better to run an EBC with my k04 rather then a MBC? i had the mbc on when i had my k03 and i loved how the boost came on