how much boost should i feed my baby???

exanator · Post by **exanator** » Thu Sep 14, 2006 1:58 pm

im running a (brand new) gt17 turbo ar .53 front and .48 rear (originally off a 2 litre saab 9.3) and full 2.5 inch exhaust straight off turbo.

also 300x280 intercooler.

also ive rec'od my head. (pistons n rings seem to be in great condition)...no blow by and bore's were all clean when head was removed for reco! originally engine has 150 thousand k's

have boost gauge and gfb boost controller!

ive put it up to 9.5psi(b4 i reco'd head) comfortably but wanting a bit more boost???
im currently on 5psi for the first 500k's of running in the head but once that happens i wanna up the boost!! any info or suggestions due to experience would be much appreciated!

Post by **The Renegade** » Thu Sep 14, 2006 2:14 pm

Don't do it without an intercooler.

Post by **shanec86** » Thu Sep 14, 2006 3:31 pm

should do 12 psi easy

wis41 · Post by **wis41** » Thu Sep 14, 2006 3:32 pm

didnt know heads had a run in period....? ive never done this.
Wissam

raddavey · Post by **raddavey** » Thu Sep 14, 2006 3:36 pm

I think just the cam needs to be broken in but wouldn't take that long. Honestly i never did anything after i got my cam regrind. Just put the supplied lubricant on it when i installed it and adjusted all the tappets after it warmed up.

Anyway 12-14psi would be as much as i would go.

Post by **The Renegade** » Thu Sep 14, 2006 3:50 pm

wis41 wrote:didnt know heads had a run in period....? ive never done this.
Wissam

When I got the heads on my old V8 done, I had to drive it for a certain period (can't remember how long) and then take it back to the mechanic for him to check clearences and head bolt tensions.

photoglossy · Post by **photoglossy** » Thu Sep 14, 2006 4:14 pm

Probably about the same as the t2... 10-12psi will be ok without in IC, any more and you will be getting into the danger zone.

Get an intercooler dude... if you really are serious about getting into boost you have to have one.

Post by **shanec86** » Thu Sep 14, 2006 4:24 pm

umm... he says he has a cooler???

"Im running a (brand new) gt17 turbo ar .53 front and .48 rear (originally off a 2 litre saab 9.3) and full 2.5 inch exhaust straight off turbo.

also 300x280 intercooler."

photoglossy · Post by **photoglossy** » Thu Sep 14, 2006 4:49 pm

well... what can i say... i should read more:p Boost it up to 14psi and be done:)

Paul Smith · Post by **Paul Smith** » Thu Sep 14, 2006 4:55 pm

I'm pretty sure cam run in involves not revving the ring out of it for a while.

exanator · Post by **exanator** » Thu Sep 14, 2006 6:28 pm

thanks for all this info, keep it coming well......

ive revved it out a bit lol but only on 5psi so i hope its fine!!!

yeh ive got a 300x280 cooler

(also have a 400x300 cooler but not sure whether to use it or not)

would 14psi lean out at all???

and will i need to do anything ot the timing???

angel · Post by **angel** » Thu Sep 14, 2006 6:40 pm

exanator wrote:thanks for all this info, keep it coming well......

ive revved it out a bit lol but only on 5psi so i hope its fine!!!

yeh ive got a 300x280 cooler

(also have a 400x300 cooler but not sure whether to use it or not)

would 14psi lean out at all???

and will i need to do anything ot the timing???

i wouldn't run 14psi with the stock ecu, especially with all the new work you have done to the engine, do you have a malpassi? id run it at 12psi with a cooler, better to be safe than sorry. but thats my opinion only.

BQ.05.TD · Post by **BQ.05.TD** » Thu Sep 14, 2006 6:51 pm

exanator wrote:thanks for all this info, keep it coming well......

ive revved it out a bit lol but only on 5psi so i hope its fine!!!

yeh ive got a 300x280 cooler

(also have a 400x300 cooler but not sure whether to use it or not)

would 14psi lean out at all???

and will i need to do anything ot the timing???

why wouldent u use the bigger cooler. the bigger the better. or are u so stingy and dont wanna do the cooler pipeing for it

Post by **The Renegade** » Thu Sep 14, 2006 8:51 pm

angel wrote:I wouldn't run 14psi with the stock ecu, especially with all the new work you have done to the engine, do you have a malpassi? id run it at 12psi with a cooler, better to be safe than sorry. but thats my opinion only.

I agree.

exanator · Post by **exanator** » Thu Sep 14, 2006 9:35 pm

well it aint that much of a modification to put bigger cooler!!!

jst not sure about the hassle of it and whether there would be a difference!

so 12psi is it aye!!!

also i dont have a malpassi and am not sure how they work to be honest???

any light shed on the MALPASSI unit would be fantaatic as i know they regulate fuel to a higher extent due to higher boost but not sure on installations etc....