RS2 tuning

[VladaS2]

Hi, question for someone knowledgeable.

When RS2 are tuned to 360+ hp, what boost are they upped to?

For best performance is it better to unplug N75 and run on manual boost control (WG spring) or tune up the boost chip for that new pressure?

Thanks

[sherv]

Hi there,

Mine runs 360bhp with a custom remap. Boost is lifted from 20psi (1.4bar) to 25psi (1.7bar)

That's the total of my knowledge hope it helps

[alg]

Hi, question for someone knowledgeable.

When RS2 are tuned to 360+ hp, what boost are they upped to?

For best performance is it better to unplug N75 and run on manual boost control (WG spring) or tune up the boost chip for that new pressure?

Thanks

As Shev said but to add that you do not unplug the WGFV/N75 as you have no protection if something goes wrong down the line.
The WG spring is usually changed to improve early boost onset and the rest is motronic reprogramming. Or at least it is if you use a tuner like MRC.

[VladaS2]

I've heard that motronic will not allow more then 1.3 bar boost when programmed and that it is the reason why n75 has to be unplugged so that boost can be controlled manually.

Sherv do you have a dyno plot of your car? When does the boost come and how it holds?

I am pretty interested in any dyno's from tuned rs2's, and how the boost map is looks like.

[merlin's S4]

I've heard that motronic will not allow more then 1.3 bar boost when programmed and that it is the reason why n75 has to be unplugged so that boost can be controlled manually.

Not true!!! Even a remap on a standard S2 would see 1.4-1.5 bar with motronic! Take a look at any of the big power 20v turbos on here still running with motronic and the N75 Valve!

[VladaS2]

Actually rs2 is factory 1.4 bar so it got to work Does anyone have a boost map of a chipped rs2??

[Jamo]

Ask Sal, his RS2 did 354 bhp unchipped but with 3" exhaust and downpipe.

RS2 ECU has 3 bar absolute MAP sensor in it I believe as standard so it can be tuned to 2 bar.

[sherv]

354bhp with exhaust and downpipe......woah!

I've requested the paperwork from Doug at MRC and will post if it arrives.....

I wonder if any bhp will be freed with the Miltek catback??!! Perhaps next is to complete the system with downpipe then??

[Matt_D]

It should do Dan mainly due to the larger bore so allowing the exhaust gasses to escape quicker, how much more i'm not sure 5-10bhp perhaps ?!?

Donwpipe would be an ideal combo for it, should release those extra horses!

Not long to wait now

[alg]

I've heard that motronic will not allow more then 1.3 bar boost when programmed and that it is the reason why n75 has to be unplugged so that boost can be controlled manually.


Sherv do you have a dyno plot of your car? When does the boost come and how it holds?

I am pretty interested in any dyno's from tuned rs2's, and how the boost map is looks like.

Boost levels: stock is peak at 1.3 Bar (1.4 Bar when trying hard) dropping
to 0.8 at the redline. Remapped it is peak at 1.8 Bar, dropping to 1.1 at the
redline.
quote from Doug at MRC when I asked so the answer to your first question is no if the tuner knows motronic

Got maps but was asked not to distribute. Boost is flat from earlier peak around 2800 with gradual fall off at redline as stated above. Never dyno'd mine mapped.

[Jamo]

Very few tuners know motronics there's a couple who claim they do but don't.

[VladaS2]

alg: thanks for info. Can you tell me what rpm is max boost (1.8 bar) at?

jamo: I think only the wheel hp counts, as different machines will show different flywheel hp (it's only a guess of the machine after all). So interesting would be to hear from Sal what is the wheel hp that his rs2 showed and to compare it to stock.

[Jamo]

alg: thanks for info. Can you tell me what rpm is max boost (1.8 bar) at?

jamo: I think only the wheel hp counts, as different machines will show different flywheel hp (it's only a guess of the machine after all). So interesting would be to hear from Sal what is the wheel hp that his rs2 showed and to compare it to stock.

Other way round as different machines will show different transmission loss for wheel power making it inaccurate.

wheel power is very american. I always think in terms of flywheel as when figures are released this is the figure they release.

Correct me if i'm wrong.

[alg]

alg: thanks for info. Can you tell me what rpm is max boost (1.8 bar) at?




jamo: I think only the wheel hp counts, as different machines will show different flywheel hp (it's only a guess of the machine after all). So interesting would be to hear from Sal what is the wheel hp that his rs2 showed and to compare it to stock.

2000 flat curve to 5500 and then drops off

[robo]

Ask Sal, his RS2 did 354 bhp unchipped but with 3" exhaust and downpipe.

RS2 ECU has 3 bar absolute MAP sensor in it I believe as standard so it can be tuned to 2 bar.

Which one??