how much boost on this setup

[Guest]

hey i got a v4 sti and hav just upgraded to a twisted gt2876r setup i hav full fuelling setup with 800cc injectors walbro fuel pump split fuel rails etc. front mount extractors bla bla bla. just wanna know if someone has run a setup similar to this and how much boost were they running, this is a stock sti engine the internals hav not been forged. i was thinking around 20-22psi???

[Disruptz]

I would very higly extremly +1111!!1111!!!!! recommend that setup getting profesionally tuned rather than use a simple mbc.. I hope that's not what you are doing,

otherwise 22psi. ;D....but maybe 18psi...coz your engine won't withstand it very long.

[Guest]

Don't go over 18.5psi unless you've replaced the MAP sensor to suit... They flatten out after that and BAMMO!, there goes a piston.

[Pappu1]

 Hopai said:

Don't go over 18.5psi unless you've replaced the MAP sensor to suit... They flatten out after that and BAMMO!, there goes a piston.

what models would that limit hold true?

[Tony]

 capster said:

hey i got a v4 sti and hav just upgraded to a twisted gt2876r setup i hav full fuelling setup with 800cc injectors walbro fuel pump split fuel rails etc. front mount extractors bla bla bla. just wanna know if someone has run a setup similar to this and how much boost were they running, this is a stock sti engine the internals hav not been forged. i was thinking around 20-22psi???

Same turbo and injector set-up that I have. I am currently running it at 20psi... I have got a built engine now, but I did run this turbo on my standard engine at 15psi and it survived fine (did quite a few track days etc on it like that).

[Guest]

 pappu']

[quote name='Hopai said:

Don't go over 18.5psi unless you've replaced the MAP sensor to suit... They flatten out after that and BAMMO!, there goes a piston.

/quote]

what models would that limit hold true?

V3 - 6. To a certain degree the 7-8 are the same but from around 21psi... V9 & 10 of course not having forged internals I wouldn't run more than 18 on without supporting equipment, (uprated sensors, reflash, etc).

With the later models the ECU's are somewhat self learning and have the ability to self adjust maps within reason, but they only have a limited range before things start getting hazardous.

You've got to remember that Factory MAP sensors in the older cars only have a 2.3Bar absolute range, so that's 1.3Bar of artificial pressure, the other 1 bar being natural air pressure (or 0psi boost), the sensors start to read from absolute vacuum...

You may or may not have troubles with turning the boost up higher than the sensors can read, but I wouldn't unless I'm trying to kill a engine!

[Guest]

 Hopai']

[quote name='Hopai said:

Don't go over 18.5psi unless you've replaced the MAP sensor to suit... They flatten out after that and BAMMO!, there goes a piston.

/quote]

what models would that limit hold true?

V3 - 6. To a certain degree the 7-8 are the same but from around 21psi... V9 & 10 of course not having forged internals I wouldn't run more than 18 on without supporting equipment, (uprated sensors, reflash, etc).

With the later models the ECU's are somewhat self learning and have the ability to self adjust maps within reason, but they only have a limited range before things start getting hazardous.

You've got to remember that Factory MAP sensors in the older cars only have a 2.3Bar absolute range, so that's 1.3Bar of artificial pressure, the other 1 bar being natural air pressure (or 0psi boost), the sensors start to read from absolute vacuum...

You may or may not have troubles with turning the boost up higher than the sensors can read, but I wouldn't unless I'm trying to kill a engine!

My version 4 map sensor happily reads upto 1.5 bar - and yes its original

[Guest]

 Tony']

[quote name='capster said:

hey i got a v4 sti and hav just upgraded to a twisted gt2876r setup i hav full fuelling setup with 800cc injectors walbro fuel pump split fuel rails etc. front mount extractors bla bla bla. just wanna know if someone has run a setup similar to this and how much boost were they running, this is a stock sti engine the internals hav not been forged. i was thinking around 20-22psi???

/quote]

Same turbo and injector set-up that I have. I am currently running it at 20psi... I have got a built engine now, but I did run this turbo on my standard engine at 15psi and it survived fine (did quite a few track days etc on it like that).

how many kw atw did you get on this setup??

[Optical]

 Qwerty']

[quote name='Hopai said:

Don't go over 18.5psi unless you've replaced the MAP sensor to suit... They flatten out after that and BAMMO!, there goes a piston.

/quote]

what models would that limit hold true?

V3 - 6. To a certain degree the 7-8 are the same but from around 21psi... V9 & 10 of course not having forged internals I wouldn't run more than 18 on without supporting equipment, (uprated sensors, reflash, etc).

With the later models the ECU's are somewhat self learning and have the ability to self adjust maps within reason, but they only have a limited range before things start getting hazardous.

You've got to remember that Factory MAP sensors in the older cars only have a 2.3Bar absolute range, so that's 1.3Bar of artificial pressure, the other 1 bar being natural air pressure (or 0psi boost), the sensors start to read from absolute vacuum...

You may or may not have troubles with turning the boost up higher than the sensors can read, but I wouldn't unless I'm trying to kill a engine!

My version 4 map sensor happily reads upto 1.5 bar - and yes its original

same here, works to 22psi on the link before it maxes out

[Tony]

 capster said:

how many kw atw did you get on this setup??

230 kw atw is what the dyno said.

[Guest]

 Tony']

[quote name='capster said:

how many kw atw did you get on this setup??

/quote]

230 kw atw is what the dyno said.

was this on the gcp dyno?? wat psi were u running to get the 230kw atw??? and when did it reach full boost?? lol just wondering if all the money spent going twisted turbo was worth it or sohuld i have just stuck to the vf22

[Tony]

 capster said:

was this on the gcp dyno?? wat psi were u running to get the 230kw atw??? and when did it reach full boost?? lol just wondering if all the money spent going twisted turbo was worth it or sohuld i have just stuck to the vf22

nah not GCP, the dyno we used was DDT in New Plymouth. That is with 20psi/1.4 bar, gets full boost at 4000rpm (now that I changed to the 0.63 turbine housing).

I guess the number doesnt sound too impressive considering, but in the real world, my car has not let me down

Its only a number at the end of the day......