more than 22psi???

[M5 TT]

Reading threads on here it looks like 99% go stage 1 or 2 and use the stock boost limit of 22psi.

Anyone added a higher range map sensor (calibrated in tune) and tune for 28psi??. I read 22psi is about the limit of the standard clutches but with careful tuning I guess the clutches could be saved.

Cant find turbo compressor map they maybe struggle at much more than 22psi top end anyway??.

Lots of graphs I see top end dying off, wonder how much timing can be optimised to keep top end power a bit longer. Some running very conservative timing top end.

[allmotor_2000]

Stock Compressor is out of its efficiency range at 22psi and turbine housing so small that EGT’s skyrocket.... all bad stuff.

Upgrade the turbo if you want more power.

[MissionPerformance]

The limit of stock clutches is around 20/21psi at 4K. As you go up in rpm, the limit goes up very quick and at around 6k, your clutches can hold 25psi.

A well maintained M5 can take about 24psi of boost after 5k rpm, though officially these turbos do fall out of efficiency at 21psi in a 650bhp range.

Here is a dyno from one of our customers when we tried to find absolute limit of stock turbos. Even though the boost was 27psi, keep in mind that there was a lot more power to be had at the same boost only if had more efficient/properly sized turbos.

[IMG]http://missiontuning.com/media/image..._M5_Limits.PNG[/IMG]

[M5 TT]

thanks for the replies.

seems like there is some power to be had over 21psi if tuned correctly.

anyone know where I can find a compressor map??

[epiphanyray]

Originally Posted by MissionPerformance

The limit of stock clutches is around 20/21psi at 4K. As you go up in rpm, the limit goes up very quick and at around 6k, your clutches can hold 25psi.

A well maintained M5 can take about 24psi of boost after 5k rpm, though officially these turbos do fall out of efficiency at 21psi in a 650bhp range.

Here is a dyno from one of our customers when we tried to find absolute limit of stock turbos. Even though the boost was 27psi, keep in mind that there was a lot more power to be had at the same boost only if had more efficient/properly sized turbos.

[IMG]http://missiontuning.com/media/image..._M5_Limits.PNG[/IMG]

Hey Alex, with SSP clutches installed + Catless DP + Stock Turbos + 100% meth + 100 Race fuel, what is the best/max/safe Boost PSI from 3000 RPM and above to achieve close to 700 WTQ + 720WHP

I remember my stock clutches were slipping when you requested about 20psi at 3000 RPM, and then you simply upped to about 22PSI from 3000+ RPM.

What kind of scale (boost by rpm/gear) would you guys do to achieve this?
Something like :2800rpm 20-21psi
and about 25psi from 3500-7200rpm?