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more boost

02gt

02gt

Well-Known Member
well it has been a thought for sometime now, i want to swap pullies later on this spring. Now the question that i'm wondering one of you guys may know is how much more boost can i run with out retuning my car. When greg at RET tuned my car he gave me a 12 to 1 A/F ratio at 7lbs of boost. I'm think of a 3.33 pulley at this time which i believe could be 11lbs of boost. My car these days throw's a code that reads that both cylinder banks run rich, which leaves me to believe i could throw a smaller pulley and the extra air will help the A/F ratio. That being said i will be throwing a intercooler before that so.... what you guys think?????
 
orange395w

orange395w

OG MEMBER
Staff member
I don't care what anyone tells you, do not run your car after a pulley swap unless you get a tune! If you do you are playing with fire especially since you do not have a wideband 02. 12:1 is not rich. It's actually starting to cross over to the lean side of the house. A blower car should ideally be at 11:0-11:5-1. Your car probably throws that code from back wash into the cylinders after coming off of a hard run. At 12:1 A/F I would venture to say that your car has more in it as it is. Sometimes too lean isn't mean. Be safe not sorry. If you swap pulleys get a tune and don't get on it until you do. Just my .02$
 
02gt

02gt

Well-Known Member
the code will start most of the time after the car is just started and then i go down the road a bit and then it starts. But that was the answer i was expecting but seeing how im going to throw the intercooler on it may as well do a pulley swap and shoot for 375+ to the wheels.
 
xavier296

xavier296

Well-Known Member
FYI, I did back to back dyno runs with the SAME tune with a 3.0 and a 3.5 pulley, and the air fuel was exactly the same on both runs. That is the beauty of the MAF. I do have a wideband though to make sure. Spend the cash on a used wideband and then go for it!
 
02gt

02gt

Well-Known Member
some times i get the 'right bank rich' code. I know that is normal condsidering this car has a blower. But it didn't throw the code until october and that is about 3 months after the car was tuned which i think is a little unual but i think the car doesn't recognize the S/C and it throws a code because it thinks it should be running 14's in A/F ratio.
 
02gt

02gt

Well-Known Member
yes i did, i did during lunch. works fine now. what do you suggest beside the hose to rememdy the blow by?
 
orange395w

orange395w

OG MEMBER
Staff member
You could slow down the velocity of the air travel by T'ing that line off and installing another check valve/pcv there along with an oil catch can ($12.99 Home depot) to keep the oil out of the intake.
 
wickedstangs

wickedstangs

Chula Vista, CA
Staff member
Administrator
02gt said:
some times i get the 'right bank rich' code. I know that is normal condsidering this car has a blower. But it didn't throw the code until october and that is about 3 months after the car was tuned which i think is a little unual but i think the car doesn't recognize the S/C and it throws a code because it thinks it should be running 14's in A/F ratio.
Click to expand...

No codes are normal... Need the DTC please...:) And quite taking your car to that shadetree mechanic orange something...:)
 
02gt

02gt

Well-Known Member
untitled.jpg


should it look like this? seems like simple mod but where would i get a catch can like that?
 
orange395w

orange395w

OG MEMBER
Staff member
I wouldn't recommend that catch can. That is actually designed for a vacuum pump setup. You don't want an open breather because it will suck unmetered air from the atmosphere and may cause a lean condition at idle and part throttle. I say may because sometimes the computer can compensate for this somewhat controlled vacuum leak.

You want a closed one like the one steeda sells, but you can get that same water/oil separator from homes depot for $12.99 like already stated.
 
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