Re-Tune with smaller pulley?
SSU'S Vice Mod
Joined: Jul 2004
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From: Hazard Co. Maryland
Obvisously you just increased the amount of boost going in so you'd want to increase the amount of fuel going in too. How much more boost will the 3.7 give you? Do you have something to tune with or do you have someone do it for you?
Launching!
Joined: Jun 2004
Posts: 236
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From: Kintnersville, PA
yeah bro, you will need to tune. im not sure how much more boost that will give you but you may need bigger injectors, maybe a fuel pump. you'll need to address fueling and timing curves...
Thread Starter
TECH Resident
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From: Jacksonville NC
I have the fuel system (SVO 42's/walboro).
I wanting a little more than 4lbs, but I was originally scared to go above 5. I think a 3.7 will give me 6-7lbs
My tuner is 3hrs away. :-( But he is worth the drive.
Thanks!
I wanting a little more than 4lbs, but I was originally scared to go above 5. I think a 3.7 will give me 6-7lbs
My tuner is 3hrs away. :-( But he is worth the drive.
Thanks!
Originally Posted by KraZy
D1-sc
U will most likely need a tune... You will have to add more fuel in the VE table after you peg the MAF. I peg mine around 4200rpm seeing 6psi or so. U might peg yours around 6000rpm. So make sure u keep the rpms under 5500rpm just for safety until u tune it. Good luck.
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If you drive the car hard with the new pulley on there and no new tuning it will go... 
I know i did it.... tuned for 7 psi and swaped to a smaller pulley and saw 11 psi..... same pump and injectors as you and when the motor did go..... we pulled the heads and it was a big mess... detination like crazy.... 4 holes on 4 different pistons and my spark plugs were green... meaning i was way lean..... that was a $$$ mistake that could of been stopped if i would of just drove the 2 1/2 hrs to my tuner..... but that history now.....
Kyle
I know i did it.... tuned for 7 psi and swaped to a smaller pulley and saw 11 psi..... same pump and injectors as you and when the motor did go..... we pulled the heads and it was a big mess... detination like crazy.... 4 holes on 4 different pistons and my spark plugs were green... meaning i was way lean..... that was a $$$ mistake that could of been stopped if i would of just drove the 2 1/2 hrs to my tuner..... but that history now.....Kyle
Originally Posted by KraZy
yes intercooled.
b1 cam, headers, off road y, 3600multi disc
ran 11.9's on street tires with only 4#'s
b1 cam, headers, off road y, 3600multi disc
ran 11.9's on street tires with only 4#'s
U will need larger injectors than the 42lbs. I maxed my 42lbs around 530rwhp with 7psi. Good luck.
Thread Starter
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From: Jacksonville NC
yikes!! 4'' pulley was 11lbs? 4'' pulley on my D1 was only 4lbs.
I dont think 3 more lbs of boost is going to give me 130 more hp. I would be scared of the bottom end then.
I dont think 3 more lbs of boost is going to give me 130 more hp. I would be scared of the bottom end then.
Launching!
Joined: Jun 2004
Posts: 236
Likes: 4
From: Kintnersville, PA
Originally Posted by Badzracing
As a point of reference, I have a p1sc and HAD a 4.00" pulley making 11lbs. I recently put a 3.6" on and it jumped to 16lbs.
Originally Posted by BoostedWS7
i dont know, i had lucas 42.5's and was running more boost and was not maxing them out. was at 60psi too. 