LS1 with AI 226 CNC heads/Fast 92mm dyno results
03-12-2016, 07:33 AM
#1
LS1 with AI 226 CNC heads/Fast 92mm dyno results I put a stock LS1 from a 2002 Z28 in my 91 Camaro about 2 years ago. It was stock other than tune, Stainless Works 1 3/4 LT headers, 3.5in Mufflex exhaust, and FTI 3200 stall torque converter. That combination made 340HP, 350ft.lbs. It ran a 12.8@109.7 on cheap Firehawk tires with that combination.
I made some changes over the winter, wanted some more power without spending a huge amount. Since this car is mainly a weekend cruiser that makes a few drag strip passes a year I wanted to stay fairly conservative. I want to run a decent 1/4 mile but didn't feel the extra expense of AFR/TFS heads would be worth it for what I'm doing with the car. I picked up a set of 243 heads from a Z06 corvette with the light weight valves...happend to find them locally for a good deal last fall. I contacted AI and Phil recommended a cam/heads package to get me where I want to be, I'm very happy with the results.
Here is a full run down of the combination.
Stock 2002 LS1 short block, around 36k miles
243 heads, AI 226 CNC porting, milled to 62cc
BTR .660 valve springs
Comp Cams Trunion upgrade
AI 228/232@.05, .625 lift, 112LSA cam
Fast 92mm intake
1 3/4 LT headers
3.5in Mufflex Exhaust
Nick Williams 92mm throttle body
Fast 36lb injectors
85mm MAF
FTI 3200 stall torque converter
stock 4l60e
Strange 12 bolt with 3.42 gears
For those wondering about the drivablilty of the combination, it drives very well. The idle is slightly rough but not too bad. I can still turn the AC on at idle, rpm dips a little but it doesn't want to die. It lost a small amount of low end torque but at about 3500 rpms it really comes alive. I wouldn't want to go any bigger with the cam in my application. It's a pretty good balance of power and driveablilty.
The attached graph shows the stock combination vs. the new H/C/I combination. Same dyno jet dyno for both. I realize dyno numbers don't mean a whole lot but this is a good comparison since both combinations were put on the same dyno. I think it would benefit from steeper gears and a higher stall speed torque converter but since it's mainly a street car, I'm not planning on changing anything unless something breaks. I'll find out how it does at the track later this year.
I made some changes over the winter, wanted some more power without spending a huge amount. Since this car is mainly a weekend cruiser that makes a few drag strip passes a year I wanted to stay fairly conservative. I want to run a decent 1/4 mile but didn't feel the extra expense of AFR/TFS heads would be worth it for what I'm doing with the car. I picked up a set of 243 heads from a Z06 corvette with the light weight valves...happend to find them locally for a good deal last fall. I contacted AI and Phil recommended a cam/heads package to get me where I want to be, I'm very happy with the results.
Here is a full run down of the combination.
Stock 2002 LS1 short block, around 36k miles
243 heads, AI 226 CNC porting, milled to 62cc
BTR .660 valve springs
Comp Cams Trunion upgrade
AI 228/232@.05, .625 lift, 112LSA cam
Fast 92mm intake
1 3/4 LT headers
3.5in Mufflex Exhaust
Nick Williams 92mm throttle body
Fast 36lb injectors
85mm MAF
FTI 3200 stall torque converter
stock 4l60e
Strange 12 bolt with 3.42 gears
For those wondering about the drivablilty of the combination, it drives very well. The idle is slightly rough but not too bad. I can still turn the AC on at idle, rpm dips a little but it doesn't want to die. It lost a small amount of low end torque but at about 3500 rpms it really comes alive. I wouldn't want to go any bigger with the cam in my application. It's a pretty good balance of power and driveablilty.
The attached graph shows the stock combination vs. the new H/C/I combination. Same dyno jet dyno for both. I realize dyno numbers don't mean a whole lot but this is a good comparison since both combinations were put on the same dyno. I think it would benefit from steeper gears and a higher stall speed torque converter but since it's mainly a street car, I'm not planning on changing anything unless something breaks. I'll find out how it does at the track later this year.
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03-12-2016, 05:46 PM
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Great results through that auto and 12 bolt for sure. I'd be happy with that considering you left some compression on the table and have a FAST 92 instead of a 102.
Jason
Jason
03-13-2016, 03:06 PM
#17
