What Turbo Size to use?

[AjPetrarca23]

im trying to find out what size t3 turbo to use for my SOHC ex setup that will be running 7psi. i know that some of the t3 turbos are way to big for my motor and dont even really make boost.


UPDATE!!

 

[2slo4u]

if you want quick spool for a daily driver pick up a t3 with a .48exhaust housing
i have that for my b series and its a quick spooler and im sure with a d series it'll be even faster

 

[AjPetrarca23]

.48 A/R. . is that waht the exhaust is if it says .48A/R

 

[AjPetrarca23]

whats the smallest t3 turbo made?

 

[TiiM iiS l3eAsT]

look for a 42/48 turbo......made by Garrett or AiResearch .....usually can be found on a saab

 

[AjPetrarca23]

.57 COMPRESSOR WHEEL TRIM

.50 A/R COMPRESSOR

.63 A/R TURBINE

that is what i have in my car now and it doesnt spool up like i want. will i see much of a difference if i get the 42/48.

 

[got traction]

im runin a t3/t4 .57 trim. full boost about 5,000 rpm...but thats on a block thats like 8.5:1 compression

 

[xxsenceo89x]

.57 COMPRESSOR WHEEL TRIM

.50 A/R COMPRESSOR

.63 A/R TURBINE

that is what i have in my car now and it doesnt spool up like i want. will i see much of a difference if i get the 42/48.

with the 42/48 i had 10psi by 3k with 8.5-1 compression

edit: dont shoot for a psi. 7psi on the turbo you have now isnt going to be the same 7psi as the one your going to put on.

 

[Matt.]

look for a 42/48 turbo......made by Garrett or AiResearch .....usually can be found on a saab

garret is airresearch

 

[AjPetrarca23]

the turbo i have now isnt even making good boost at all. i thought it was too big for motor.

so i should get the 42/48?

 

[2slo4u]

if you do get it you'll spool up quicker..but the top end will be pretty flat

 

[TiiM iiS l3eAsT]

garret is airresearch

well no s**t lol but some turbos say garrett on them and some say airesearch on them.....

what brand is your turbo.....i might trade you turbos.....im looking for somethen a lil bigger

 

[djrenok]

im runin a t3/t4 .57 trim. full boost about 5,000 rpm...but thats on a block thats like 8.5:1 compression

Same here, just throw in some vitaras and custom I beam rods to bring compression down to 8.5.1 and go with a 53 trim. thats what i got. Pulls hard from 4-7K

 

[AjPetrarca23]

So i put the 42/48 turbo in. its alot better but im still not fully satified. im untuned now. how much of a difference in HP will i feel after my tune.

 

[codyllee]

About 43.35 more whp.... i really hope you are not making any full-throttle pulls being untuned and all. Do you have a wideband to monitor your a/f ratios? Getting tuned will yield a big difference!

 

[AjPetrarca23]

i dont even really feel that much boost right now being untuned. idk what the prob. is everything is hooked up right with no boost leaks

 

[TiiM iiS l3eAsT]

maybe the fact that your untuned has something to do with it???

 

[toneekay]

is your motor built? most y8's dont have problems making power, or boost, or feel, or pull with a 57/63

 

[AjPetrarca23]

no its not built. ima just get a tune and see what happens. or just take it to someone who can figure it out.

 

[toneekay]

^it just probably needs a good tune.. what turbo were you running before this one?