GM Racing Exhaust Ported Cylinder Head
11-07-2013, 05:09 PM
#77
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Not trying to threadjack but how much of a difference did it make? Staged, you should sell me your Corsa exhaust because I don't think GM used that exhaust. Lol jk
11-07-2013, 07:48 PM
#79
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I picked up 28hp and 17 ft/lbs with the GMR head I bought from John Powell, put me at 263hp/238ft/lbs. Stock cams, kn typhoon, gmpp catback, zzp longtube with high flow cat from autowerks, stage 3 injectors on a m62 with coated rotor on a 2.9 pulley. It ran great all season on track and with the yyz and koni yellows I was shaving 3 to 4 seconds off my lap times at every track I saw this year...compared to last years times. I added a griffin, option b and dual pass to keep iat temps in line, going to single pass for next year as I plan on running a few tracks down south...Rd Atlanta and Barber so wanna make sure heat doesn't become an issue. Long story short, the head was the least expensive bang for the buck given the gains I saw. Adding tvs this winter and engine is done.
11-07-2013, 07:52 PM
#80
I picked up 28hp and 17 ft/lbs with the GMR head I bought from John Powell, put me at 263hp/238ft/lbs. Stock cams, kn typhoon, gmpp catback, zzp longtube with high flow cat from autowerks, stage 3 injectors on a m62 with coated rotor on a 2.9 pulley. It ran great all season on track and with the yyz and koni yellows I was shaving 3 to 4 seconds off my lap times at every track I saw this year...compared to last years times. I added a griffin, option b and dual pass to keep iat temps in line, going to single pass for next year as I plan on running a few tracks down south...Rd Atlanta and Barber so wanna make sure heat doesn't become an issue. Long story short, the head was the least expensive bang for the buck given the gains I saw. Adding tvs this winter and engine is done.
11-07-2013, 08:05 PM
#81
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Yeah, sorry, I knew I was forgetting something. Prior to head change boost was peaked at 18 or 19psi depending on air quality, saw it hit 20 a couple times on track. Post head swap boost peeked at 15 or 16 psi, on track the highest I saw all season was 17psi. That was when John Heinricy was driving it on track with me in pass seat, so either he is just so good he got more boost out of the car(which he is and did) or the angle I was looking at the gauge made it look like he picked up some boost?
11-12-2013, 07:22 AM
#82
Yep, sure did.
Was a 3" version though, but lets not split hairs
Awesome!!
Thank you for adding this. You and I have a similar setup, minus the M62 & stock cams part (although, I might be installing stock cams again).
Are u running pump gas? 93 octane?
I look forward to installing my GMR head even more now.
Was a 3" version though, but lets not split hairs
I picked up 28hp and 17 ft/lbs with the GMR head I bought from John Powell, put me at 263hp/238ft/lbs. Stock cams, kn typhoon, gmpp catback, zzp longtube with high flow cat from autowerks, stage 3 injectors on a m62 with coated rotor on a 2.9 pulley. It ran great all season on track and with the yyz and koni yellows I was shaving 3 to 4 seconds off my lap times at every track I saw this year...compared to last years times. I added a griffin, option b and dual pass to keep iat temps in line, going to single pass for next year as I plan on running a few tracks down south...Rd Atlanta and Barber so wanna make sure heat doesn't become an issue. Long story short, the head was the least expensive bang for the buck given the gains I saw. Adding tvs this winter and engine is done.
Thank you for adding this. You and I have a similar setup, minus the M62 & stock cams part (although, I might be installing stock cams again).
Are u running pump gas? 93 octane?
I look forward to installing my GMR head even more now.
Last edited by Staged07SS; 11-12-2013 at 10:46 AM.
11-12-2013, 07:32 AM
#83
Update:
Sadly, I didn't get to mess with tearing the car apart this weekend.
Had to give the winter beater some much needed attention ie. new brake lines and fuel lines.
This week, I will start tearing her apart for sure.
Sadly, I didn't get to mess with tearing the car apart this weekend.
Had to give the winter beater some much needed attention ie. new brake lines and fuel lines.
This week, I will start tearing her apart for sure.
11-12-2013, 03:00 PM
#86
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Yep, sure did.
Was a 3" version though, but lets not split hairs
Awesome!!
Thank you for adding this. You and I have a similar setup, minus the M62 & stock cams part (although, I might be installing stock cams again).
Are u running pump gas? 93 octane?
I look forward to installing my GMR head even more now.
Was a 3" version though, but lets not split hairs
Awesome!!
Thank you for adding this. You and I have a similar setup, minus the M62 & stock cams part (although, I might be installing stock cams again).
Are u running pump gas? 93 octane?
I look forward to installing my GMR head even more now.
11-12-2013, 07:44 PM
#89
I agree. I have had built a LSJ engine for customers with TVS and a very nice ZZP stage 2 cam set, and the engine made 323 whp on street pump gas. I make with stock cams 320 whp on race gas and 305 whp or street pump gas.
difference is , I have very nice torque band very good on the track and a rev band that starts with peak torque at 4500 ( more peak torque than the stage 2 ZZP and more peak torque than Mr. B shows, and that torque on cams may be a higher peak.) Cross over is about 800 rpm less with the stock cams.
So this makes the car very driveable. Admittedly I run single pass, and I drive like a granny on the street.
The valve train wear on the stage 2 cam set up is pretty hard. On Time Attack, BITD GM tried really hard to get the 272 cams to work, and at the 11th hour with the Time Attack event coming up, and many blown engines in dyno testing, the decision was made to go back to stock cams. LSJ stock cams are very well thought out imho.
There are lots of folks like cams, and I wish them all well with the LSJ. That said,
Speedbuggy, I am with you. And the OP. lol
difference is , I have very nice torque band very good on the track and a rev band that starts with peak torque at 4500 ( more peak torque than the stage 2 ZZP and more peak torque than Mr. B shows, and that torque on cams may be a higher peak.) Cross over is about 800 rpm less with the stock cams.
So this makes the car very driveable. Admittedly I run single pass, and I drive like a granny on the street.
The valve train wear on the stage 2 cam set up is pretty hard. On Time Attack, BITD GM tried really hard to get the 272 cams to work, and at the 11th hour with the Time Attack event coming up, and many blown engines in dyno testing, the decision was made to go back to stock cams. LSJ stock cams are very well thought out imho.
There are lots of folks like cams, and I wish them all well with the LSJ. That said,
Speedbuggy, I am with you. And the OP. lol
11-12-2013, 07:52 PM
#90
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If I can get to 305is on 93 octane I'll be happy with that, nicely balance for the track on 235 tires and still a good daily driver. With the new trans going in next week and the 4.45 final I think I'll be good. Single pass is also in the works before spring.
11-12-2013, 11:37 PM
#96
Nothing set in stone. The gmr head came with brand new stock cams and I have been tossing around the idea of using them. I also wanted to follow the time attack engine as close as possible, which ran stock cams. Although, I must admit I do love my s1 cams. They have similar torque as stock, but really pull hard to my 7.5k limiter.
Last edited by Staged07SS; 11-13-2013 at 07:51 AM.
11-12-2013, 11:59 PM
#97
Timing chain will be left alone, but I will be installing new arp timing chain guide bolts. I will re inspect the chain, but when I did my cam install last winter everything looked mint. I also have the upgraded tensioner installed and will be purchasing a new one after for the head install.
11-12-2013, 11:59 PM
#98
I agree. I have had built a LSJ engine for customers with TVS and a very nice ZZP stage 2 cam set, and the engine made 323 whp on street pump gas. I make with stock cams 320 whp on race gas and 305 whp or street pump gas.I.
difference is , I have very nice torque band very good on the track and a rev band that starts with peak torque at 4500 ( more peak torque than the stage 2 ZZP and more peak torque than Mr. B shows, and that torque on cams may be a higher peak.) Cross over is about 800 rpm less with the stock cams.
So this makes the car very driveable. Admittedly I run single pass, and I drive like a granny on the street.
The valve train wear on the stage 2 cam set up is pretty hard. On Time Attack, BITD GM tried really hard to get the 272 cams to work, and at the 11th hour with the Time Attack event coming up, and many blown engines in dyno testing, the decision was made to go back to stock cams. LSJ stock cams are very well thought out imho.
There are lots of folks like cams, and I wish them all well with the LSJ. That said,
Speedbuggy, I am with you. And the OP. lol
difference is , I have very nice torque band very good on the track and a rev band that starts with peak torque at 4500 ( more peak torque than the stage 2 ZZP and more peak torque than Mr. B shows, and that torque on cams may be a higher peak.) Cross over is about 800 rpm less with the stock cams.
So this makes the car very driveable. Admittedly I run single pass, and I drive like a granny on the street.
The valve train wear on the stage 2 cam set up is pretty hard. On Time Attack, BITD GM tried really hard to get the 272 cams to work, and at the 11th hour with the Time Attack event coming up, and many blown engines in dyno testing, the decision was made to go back to stock cams. LSJ stock cams are very well thought out imho.
There are lots of folks like cams, and I wish them all well with the LSJ. That said,
Speedbuggy, I am with you. And the OP. lol