04-05-2024, 07:24 AM | #29 | |
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If you're ever out this way, give me a shout and we should connect for a bite to eat and you can give me the low-down on Auto-x with the 5th gen. I used to do some in smaller FWD cars I've owned, and I have my SS on Watkins Glen and PineView, but never autox - the visibility and weight lead me to think it probably isn't super competitive. https://gwatneyperformance.com/lifte...ont-hurt-will/
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GPI Max Package 2.0: Brodix BR7 heads/GPI porting, MAX3 cam, ST2116LSR, BSR Max Lift rockers, LS7 LSXR with 103mm TB, Vararam OTR, Mcleod RXT, G-Force/Strange 9" IRS setup with 4.63 gear. 551whp, 11.1@124mph.
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04-05-2024, 06:25 PM | #30 | |
Drives: '94 Z28+ '15 Z/28 Join Date: Jun 2009
Location: Cheektowaga, NY
Posts: 1,285
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6th gen SS 1LE's are ringers in the F-Street class. They are neck and neck with the new Mach 1, and at most large events you'll see a bunch of them. If I do an event with the Finger Lakes Region SCCA, I'll let you know. They race at the Seneca Army Depot which is 30 minutes from Watkins Glen.
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1973 Mach 1, 351C cruiser
'15 Z/28 Red Hot, A/C 1980 Z28- resto-mod project 1979 Y84 Trans Am 1986 IROC-Z |
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04-08-2024, 11:53 AM | #31 | |
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GPI Max Package 2.0: Brodix BR7 heads/GPI porting, MAX3 cam, ST2116LSR, BSR Max Lift rockers, LS7 LSXR with 103mm TB, Vararam OTR, Mcleod RXT, G-Force/Strange 9" IRS setup with 4.63 gear. 551whp, 11.1@124mph.
Got a question about a GPI product? Feel free to shoot me a message! |
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04-17-2024, 12:02 AM | #32 |
Drives: Chevrolet Camaro Z28 (2015) Join Date: Feb 2023
Location: Washington state
Posts: 83
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another update. Car is almost done. map is not complete yet, at moment it's set at 21degree advance but it is "only" giving 520hp at wheels... everyone (me included) is expecting something around 550 given how extreme the cam is.
Tuner was not 100% confident this can be achieved with tune given current result. My suspicions are on the heads. The MAST Factory might not be fluxing that good. anyway... we will see, before end of week I should have the final verdict. I don't care about HP, I just want to fix that valve problem with heads. There was a problem with pushrods being too "thick" for the head, which was restricting oil flow into the head. That was a scary moment, now solved.
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2015 Red Z/28. Seattle area |
04-17-2024, 01:25 PM | #33 |
Drives: '94 Z28+ '15 Z/28 Join Date: Jun 2009
Location: Cheektowaga, NY
Posts: 1,285
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They can't hit the actual rack, they hit the steering shaft. You have to remove the bolt on the shaft, pull the top part out, and then zip-tie it to the side during the install.
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1973 Mach 1, 351C cruiser
'15 Z/28 Red Hot, A/C 1980 Z28- resto-mod project 1979 Y84 Trans Am 1986 IROC-Z |
04-17-2024, 10:28 PM | #34 |
Drives: Chevrolet Camaro Z28 (2015) Join Date: Feb 2023
Location: Washington state
Posts: 83
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2015 Red Z/28. Seattle area |
04-19-2024, 10:32 PM | #35 |
Drives: Chevrolet Camaro Z28 (2015) Join Date: Feb 2023
Location: Washington state
Posts: 83
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got the car back.
First of all... the car sounds MEAN. Like, really loud (despite stock exhaust) and absolutely menacing. here's a cold start (the 1st cold start I heard of it) https://youtube.com/shorts/BhsriMgaqxI?feature=share phone doesn't fully capture the chop speaking about more interesting stuff...we were all a bit disappointed by the result. It's good but we were expecting more given how extreme the cam is. car drivability is VERY low below 2000 rpm, engine picks up revs much quicker and sound is definitely insane above 3000 rpm. very race-car like. I couldn't pull gears to the end so i can't speak for perceived performance, but overall it feels a bit quicker. I was expecting at least 550 at wheel... we are close, but both me and tuner were expecting more, with much less extreme cams they saw over 560 at wheel. my theory is that there are 2 factors at play here: 1/ in washington state we only have 91, so a bit is loss due to "bad" fuel 2/ everyone else that changed to a similar setup also changed intake and 103mm CF. I did not. Maybe airflow is a constraint at high revs? lastly, it would well be that the heads don't flow better than the stock heads, but it's unlikely to be honest. I will post more as I will drive it, today I could only suffer in heavy traffic while I was bring it back home. Seattle is as bad as Los Angeles in that regard (no joking)
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2015 Red Z/28. Seattle area |
04-21-2024, 08:45 AM | #36 |
Drives: '15 Z/28 Join Date: Nov 2021
Location: AtATrack
Posts: 77
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High performance aftermarket is filled with overly optimistic hp/torque figures and backed by shops with optimistic dynos. This is what sells.
I think that you approached this in the correct way with before and after measurements. And you know that any dyno will have variations of +/- X%. You can run the same exact configuration two different days and get different numbers. Personally, I think that a ~15+% gain after a tune and headwork is great. It will be interesting to get your impression about real world driveability since that is probably the most important measure. The car does sound like a dragster! Enjoy it with the nicer weather. |
04-21-2024, 04:11 PM | #37 | |
Drives: Chevrolet Camaro Z28 (2015) Join Date: Feb 2023
Location: Washington state
Posts: 83
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Quote:
Hey, thanks for the message. I really don't mind about HP, but similar setups with less extreme cams gave 560+ on Z06 on the same dyno, tuned by same people. This is why we are a bit surprised by the result. I don't need more power, I don't care... but this might be a sign of something being off. One example could be a shorter pushrod ? or the insufficient air intake (i doubt it, but who knows). Said so: car drivability. Severely affected. Car refuses gas below 1900rpm, especially in high gears. It will stumble and buckle and requires VERY smooth accelerator action. Lowering one gear and getting >2000 is almost required in real traffic situations. I was expecting this, so no big surprise there. Point is that less extreme cams give more power with more drivability (if this is the case), which means that combination of these pieces I've put together is not giving 100% of what they could. I will keep driving it a few days checking oil pressure and oil temp. I want to make sure everything is fine. Car sounds incredible from 3000rpm, like a real racing V8. Big cams sure deliver in terms of sounds on a pushrod V8
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2015 Red Z/28. Seattle area |
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04-21-2024, 04:12 PM | #38 | |
Drives: Chevrolet Camaro Z28 (2015) Join Date: Feb 2023
Location: Washington state
Posts: 83
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Quote:
is it possible to do it even after installation of headers?
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2015 Red Z/28. Seattle area |
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04-22-2024, 06:33 AM | #39 |
Drives: '94 Z28+ '15 Z/28 Join Date: Jun 2009
Location: Cheektowaga, NY
Posts: 1,285
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All dyno's read different, but you did do a baseline before, and your baseline numbers were right were most others fall. If your baseline was 420-425~ish, then I'd say your new numbers are accurate. An MSD Atomic Airforce and a 103+mm TB will certainly add more power but that's a tough $1700 to spend along with another dyno tune. I don't know if they'll give you the 25-30hp that you're looking for. But they are pretty easy to install.
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1973 Mach 1, 351C cruiser
'15 Z/28 Red Hot, A/C 1980 Z28- resto-mod project 1979 Y84 Trans Am 1986 IROC-Z |
04-23-2024, 09:35 PM | #40 | |
Drives: Chevrolet Camaro Z28 (2015) Join Date: Feb 2023
Location: Washington state
Posts: 83
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update.
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We will also try to fix the problem of steering column hitting the headers... we will try both via releasing the top bolt and by shimming engine mounts (if push come to shove).
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2015 Red Z/28. Seattle area |
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04-24-2024, 06:40 AM | #41 | |
Drives: '94 Z28+ '15 Z/28 Join Date: Jun 2009
Location: Cheektowaga, NY
Posts: 1,285
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https://www.camaro5.com/forums/showthread.php?t=573885 I still don't understand why your headers hit, unless the cylinder head casting is different enough. I saw that the shop said that they were taller than the stock heads, needing different pushrods, so I believe your problem with your headers hitting may be because of your heads. My Kooks 2" fit just fine.
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1973 Mach 1, 351C cruiser
'15 Z/28 Red Hot, A/C 1980 Z28- resto-mod project 1979 Y84 Trans Am 1986 IROC-Z |
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04-24-2024, 06:37 PM | #42 | |
Drives: Chevrolet Camaro Z28 (2015) Join Date: Feb 2023
Location: Washington state
Posts: 83
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Quote:
Thank you for the installation post
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2015 Red Z/28. Seattle area Last edited by void_kp; 04-24-2024 at 06:50 PM. |
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