HP Tuning on E85
Melting Slicks
Joined: Feb 2000
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From: new orleans
Build
If you look at what GPI and Prey do, you would get 600 rwhp for that much money! If you’re going to run E and it really available in your area i would bump the compression a full point. It would scream and with the right combo rev to 7500. And sound wonderful doing it.
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Melting Slicks
Joined: Aug 2022
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I'm thinking mill the heads for +0.5 compression, cam and nicely worked heads with a tune for both pump 93 and E85. Maybe 550whp is possible? If you decided to build the exhaust side with headers and cats, maybe knocking on 600whp? I'd like to have a 7000rpm LT2 that could be right on top of Z06 power numbers at a couple of hundred pounds less. That would do nicely. I'd pay $20K for that.
Le Mans Master
Joined: Mar 2001
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From: Omaha
2020 Corvette of the Year Finalist (performance mods)
C4 of Year Winner (performance mods) 2019
550-600whp with 7,000rpm redline cam package would be great and really make me reconsider staying on the list for a Z06. The problem with any higher than 7,000 is that's where the tach stops on the C8. Guess you could do a shift light if you had a higher rev limit, but I like seeing it on the tach.
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Melting Slicks
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Enticing idea, isn't it? LT2 built for 7000rpm with a mild cam, 12:1 compression ratio, worked heads with valves perfectly sized to work with the cam, equal length long tube headers with 2" primaries and 200-cell sport cats and topped off with tuning to get the most out of it. Maybe seeing 600 crank with an E85 map? If that were doable for a reasonable outlay, I think a lot of people would get in line. Many of us want more out of the car but don't want to play the allocation games with the higher end models. You could buy an 1LT, throw this mythical $20K at it and have a hell of a car for under $90K.
EvanZR1, as to the tach stopping at 7K, it is digital so I'm sure some whiz kid could figure out how to get a new tach up there.
EvanZR1, as to the tach stopping at 7K, it is digital so I'm sure some whiz kid could figure out how to get a new tach up there.
Last edited by combatninja; Jul 23, 2023 at 02:52 PM.
Dig
Joined: Jan 2006
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From: Port Saint Lucie FLORIDA & HONDURAS
Enticing idea, isn't it? LT2 built for 7000rpm with a mild cam, 12:1 compression ratio, worked heads with valves perfectly sized to work with the cam, equal length long tube headers with 2" primaries and 200-cell sport cats and topped off with tuning to get the most out of it. Maybe seeing 600 crank with an E85 map? If that were doable for a reasonable outlay, I think a lot of people would get in line. Many of us want more out of the car but don't want to play the allocation games with the higher end models. You could buy an LT1, throw this mythical $20K at it and have a hell of a car for under $90K.
EvanZR1, as to the tach stopping at 7K, it is digital so I'm sure some whiz kid could figure out how to get a new tach up there.
EvanZR1, as to the tach stopping at 7K, it is digital so I'm sure some whiz kid could figure out how to get a new tach up there.
^^ this I believe will be doable in the future. Probably happening right now
600 crank vs wheel should make a huge difference in 4th gear.
Post #24. Brett (Pray Performance) can get things done. Not just on a dyno.
With HP Tuning and … once a trans tune happens …. NA C8’s will be going 9’s in decent air
Racer
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From: Oklahoma
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Melting Slicks
Joined: Aug 2022
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For sure. There might well be a whole lot of disappointed folks that drop a lot of coin on a NA build now that tuning is a thing only to kind of think "it's still slow from a roll". The NA pathway is definitely not for the roll racers or the half mile guys. You had better be cool with spending a LOT of money for modest gains in terms of dyno numbers or trap speeds. Where it will make a difference is going to be responsiveness and an enlarged powerband at the top. Instead of falling off up above 5000rpm, these should keep pulling hard up to 6800-7000 or so. It will really make a difference to the road course guys. I think a Z51 Stingray with 550-575whp that can rev out to 7000 rpm and a couple hundred pounds taken out might be just what a lot of folks have been looking for. Let's get a trans tune and revised 4th and 5th gears while we're at it. But then you're probably into the $30K range on pricing and you start to think a Z06 makes a lot more sense.
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Racer
Joined: Apr 2020
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From: Oklahoma
For sure. There might well be a whole lot of disappointed folks that drop a lot of coin on a NA build now that tuning is a thing only to kind of think "it's still slow from a roll". The NA pathway is definitely not for the roll racers or the half mile guys. You had better be cool with spending a LOT of money for modest gains in terms of dyno numbers or trap speeds. Where it will make a difference is going to be responsiveness and an enlarged powerband at the top. Instead of falling off up above 5000rpm, these should keep pulling hard up to 6800-7000 or so. It will really make a difference to the road course guys. I think a Z51 Stingray with 550-575whp that can rev out to 7000 rpm and a couple hundred pounds taken out might be just what a lot of folks have been looking for. Let's get a trans tune and revised 4th and 5th gears while we're at it. But then you're probably into the $30K range on pricing and you start to think a Z06 makes a lot more sense.
Stay in 2nd to get to 60... instead of the 58mph shift :/
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Melting Slicks
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Yep, 4th would carry you to 124.26mph and 2nd would top out at 62.13mph. I've got some ideas for tweaked ratios for 4th-6th but even if we get stuck with the same ratios, the 7000rpm redline would really help things out. Who knows, with sticky tires and a proper launch, even a car with a really mild cam and headwork might rip off a 2.6s 0-60 given that there'd be only one shift to make.
Le Mans Master
Joined: Mar 2001
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From: Omaha
2020 Corvette of the Year Finalist (performance mods)
C4 of Year Winner (performance mods) 2019
Z51 would hit 125MPH at 7009rpm in 4th. Non-Z51 would hit 130MPH at 6895rpm in 4th. Cam and raised rev limit to 7000-7200 would be a huge benefit to either for runs up to 130. It would also let non-Z51 hit 175MPH at 6903rpm in 5th, and Z51 would hit 170MPH at 7090rpm, so both would be helped in 1/2 mile & mile events as well.
Le Mans Master
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From: Tampa Florida
The delay may be due to the GM TCM recall communication service. I received my letter last month for scheduling which I haven't done yet
Pro
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From: Memphis Tennessee
https://www.youtube.com/watch?v=FeEi...5jZSBjOA%3D%3D
If you don't feel like wasting 10 minutes, the car has Eventuri intake, Ligenfelter PTR carbon intake w/throttle body, Paragon headers & Paragon exhaust. No tune, it put down a pitiful 437whp on 91. Tuned for 91 it put down 451. Tuned with 93 it put down 465. E85 tuned put down 500. Kinda......disappointing to be honest. The startling number is the tuned 93 number of 465 with all those bolt ons. That seriously sucks. I'd be expecting that number or better with no tuning at all. What they neglected to get was just the number on 93 with stock tuning, which would've been interesting. Until I see something revolutionary, I think that tuning is a waste of time until you are into a cam and/or headwork.
I'd estimate that to replicate that build you'd be looking at $13,000-$14,000 at retail prices. Um, that's a hard 'no' from me, dawg.
If you don't feel like wasting 10 minutes, the car has Eventuri intake, Ligenfelter PTR carbon intake w/throttle body, Paragon headers & Paragon exhaust. No tune, it put down a pitiful 437whp on 91. Tuned for 91 it put down 451. Tuned with 93 it put down 465. E85 tuned put down 500. Kinda......disappointing to be honest. The startling number is the tuned 93 number of 465 with all those bolt ons. That seriously sucks. I'd be expecting that number or better with no tuning at all. What they neglected to get was just the number on 93 with stock tuning, which would've been interesting. Until I see something revolutionary, I think that tuning is a waste of time until you are into a cam and/or headwork.
I'd estimate that to replicate that build you'd be looking at $13,000-$14,000 at retail prices. Um, that's a hard 'no' from me, dawg.
Well all of those mods don't put out any real HP on this platform anyway, so they're basically cosmetic mods only. I don't care what the manufacturers say they gain, I've seen plenty of dynos and heard plenty of reviews on everything that show there's hardly any gain, if any at all with them. If you put that $13,000+ into a real performance package like heads/cam/tuning or forced induction then you'd net much better results.
Last edited by DomLS3; Jul 25, 2023 at 05:06 PM.
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Melting Slicks
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Some of it might be snake oil (looking at you, PTR intake) but headers are pretty proven on this platform. I don't think it's fair to say they're 'cosmetic'. I guess the real question is, what does a bone stock C8 put down on 91 Cali pisswater? 410whp? Honest question. That will tell us how much the suite of modifications conspired to add. There is so much info missing from this video that it is hard to make any real determinations as to what exactly is happening and why.
Instructor
Joined: Jan 2021
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From: Redwood City, CA
Yes a, because it voids the warranty. I’ve modified all of my previous 9 Corvettes, but it’s just not worth it on the C8 with the trans failures. I don’t think the failure rate is really as bad as many make it out to be, but even if it’s 1%, that’s still a decent risk as opposed to previous manual transmission cars.
I have the same opinion. I'm going to wait for my warranty to end before rolling the dice.
Racer
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From: Oklahoma
Pro
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From: Oklahoma
We love our NA motors and it’s fun to compare and watch gains across our platform. But I can’t help but laugh at ourselves. All these numbers are totally embarrassing on most other forums….especially turbo car forums. My teenagers can get a $500 chip on their Japanese car and get an extra 100HP. We’re talking $14,000 for 60HP on our C8’s. Has to be the most $$$’s/HP ever!
Porsche, BMW, and Audi are the cheapest $$’s/HP gains. They are getting 100-200whp gains for $1500 tunes. Crazy. NA vs Turbo.
Porsche, BMW, and Audi are the cheapest $$’s/HP gains. They are getting 100-200whp gains for $1500 tunes. Crazy. NA vs Turbo.
Racer
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