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Thanks. I have the 2650 installed with meth and headers. Tuned to almost 700 wheel hp. Haven’t touched the internals yet. Was told by my well known national builder I’m good to 700 WHP. Just wanted to see what you thought since you worked for Magnuson and saw their testing as well.
Just be happy right there and have fun with it. Its a gamble to push is further and obviously it burns a hole in your wallet to do a short block build. Plus 700 rwhp will get you down in the low 10s is you want to go to the track or you can Sideways Jones it anytime you want. Good build for sure.
Just be happy right there and have fun with it. Its a gamble to push is further and obviously it burns a hole in your wallet to do a short block build. Plus 700 rwhp will get you down in the low 10s is you want to go to the track or you can Sideways Jones it anytime you want. Good build for sure.
totally agree here. I really feel 700 rwhp is the happy spot for this car mainly on street. More than that and it’s hard to put the power down unless your at a prepped track.
totally agree here. I really feel 700 rwhp is the happy spot for this car mainly on street. More than that and it’s hard to put the power down unless your at a prepped track.
More than 700 WHP…heck it won’t hook now at 700whp.
I had EastCoast Supercharging tune my c7 LT1 on meth with all stock fuel system and so far so good for the first season. It made 670 rear wheel through a A8
I may be the only one on this forum that does not own a corvette or a Camaro! I own two GMC Yukon Denali. One a 2014 with a supercharged LS3 and a 2018 with a supercharged LT4. In the spirit of this thread I will talk about the 2018.
I really liked the power added to the LS3 with a 2650 Maggie at ~10 psi boost. It is a blast to drive. (Those of us that cannot get into and out of a corvette without assistance!) I am 6’8” tall and weigh about 240 lbs. And 71 years old.
When I bought the 2018 I started looking for what options the LT1 had and decided to, at 70000 miles, to buy a GM crate motor LT4, swap the supercharger that came with it for the 2650 Maggie from the LT5 engine. Added headers. There is about 19% loss through the power train with transmission, transfer case and huge drive shaft. So flywheel numbers are calculated to be in the low 700 hp. (Beating the new Cadillac V series Escalade!) This is on pure 93 octane gasoline.
I am looking at what it will take to get this engine running on E85, as my next step.
One last piece of info. I pulled the 10 speed transmission and had it rebuilt with raybestoes friction plates and parts they are using in drab racers pushing 2000 hp for thier passes at the 1/4 mile.
Just an old guy trying to be comfortable and fast!
When i installed the LT4 supercharger it had a light surge at low speed 20-34 mph i've put about 1500 miles on it and it's getting worse now any ideas i replaced the plugs the old ones looked fine the car has the Z06 fuel pump and injectors with long tube headers and catless x-pipe also GM cold air intake
When i installed the LT4 supercharger it had a light surge at low speed 20-34 mph i've put about 1500 miles on it and it's getting worse now any ideas i replaced the plugs the old ones looked fine the car has the Z06 fuel pump and injectors with long tube headers and catless x-pipe also GM cold air intake
Did you check intake tube? sometimes it gets loose and causes a vacuum issue. But sounds like a vacuum or MAP sensor location issue.
LT4 supercharger on my 6.2 LT1 broken piston rings
Originally Posted by johny125
I am new to superchargers and have read a bunch about how the LT1 is not the best platform to supercharge. Issues relating to the high compression ratio, piston ring tolerance, fuel starvation, etc, have me discouraged in adding a centrifigal or roots supercharger. So the question is........Has anyone actually experienced a supercharger FAILURE on an LT1 supercharger that is tuned correctly with 7# of boost? I am SO MUCH on the fence. Some installers say the injectors and fuel pump need to be upgraded to Z06 and some do not. Would it be cheaper and safer to just save for a Z06??
LT1 Corvette with a LT4 supercharger installed after approx 15,000 kms of driving engine is now torn apart as per broken piston rings on 7 out 8 pistons . Broken piston C7 6.2 LT1 with LT4 supercharger installed .
Note : If your going to put a supercharger on your LT1 6.2 litre my best advise install forged pistons and rods lower the compression ratio to 10.5:1 or lower or your going to end up with a broken piston In the future .
Last edited by CorvetteLT1LT4SC; Jun 5, 2023 at 09:43 PM.
LT1 Corvette with a LT4 supercharger installed after approx 15,000 kms of driving engine is now torn apart as per broken piston rings on 7 out 8 pistons . Broken piston C7 6.2 LT1 with LT4 supercharger installed .
Note : If your going to put a supercharger on your LT1 6.2 litre my best advise install forged pistons and rods lower the compression ratio to 10.5:1 or lower or your going to end up with a broken piston In the future .
What were the other aspects of the build? WHP? meth, any other mods?
No methanol could have helped , stock C7 with LT4 supercharger installed 573 RWHP. Aluminum pistons and the close ring gap along with 11:5:1 compression can’t handle 9 plus psi boost that’s it . Don’t make the mistake I did . I’m currently rebuilding my motor lowering the compression ration installing forged internals so the lower end can handle the 9 - 14 psi boost pressure.
No methanol could have helped , stock C7 with LT4 supercharger installed 573 RWHP. Aluminum pistons and the close ring gap along with 11:5:1 compression can’t handle 9 plus psi boost that’s it . Don’t make the mistake I did . I’m currently rebuilding my motor lowering the compression ration installing forged internals so the lower end can handle the 9 - 14 psi boost pressure.
Doesn't sound like you went over board at all. What were you up to when it popped?
I've put 10k miles on my stage 1 Edelbrock (which from what people say is the most docile kit you can get) 5.5lbs boost and its the only mod on the car. Car puts down a conservative 500whp/500tq which was my goal as i wanted the car to feel like my Gen III Viper.
When you guys say you have no issues, if you only use the power once in a while for short bursts you may be fine
I doubt a supercharged LT1 would handle happily roadcourse usage with 20-30min session of heavy use....
Do you know/know of anyone that has road raced/tracked regularly an aftermarket supercharged C7? Very curious if there is some safe level, like say 550 HP, all day long at the track and not just for some 1/4 miles, street racing, etc.
Do you know/know of anyone that has road raced/tracked regularly an aftermarket supercharged C7? Very curious if there is some safe level, like say 550 HP, all day long at the track and not just for some 1/4 miles, street racing, etc.
I think you're just going to have to make a decision based on whats been said. If you have the money and ability to build the bottom end, do it. It's good insurance. However, tehres a wealth of people here stating they've safely been running high power levels on quality parts amd tune woth no issues. I live in the SOCAL desert and drive a few hundred miles a day with no issues. I'm sure your 20 or 30 minute track runs are not THAT much harder on the bottom end.
I think you're just going to have to make a decision based on whats been said. If you have the money and ability to build the bottom end, do it. It's good insurance. However, tehres a wealth of people here stating they've safely been running high power levels on quality parts amd tune woth no issues. I live in the SOCAL desert and drive a few hundred miles a day with no issues. I'm sure your 20 or 30 minute track runs are not THAT much harder on the bottom end.
Doing those few hundred miles a day, are you sustaning high RPMs for 20-30 minutes at a time though? If you're not, you're not sitting under boost for extended peroids of time force feeding the combustion chambers high pressures and heat with no break inbetween.
Doing those few hundred miles a day, are you sustaning high RPMs for 20-30 minutes at a time though? If you're not, you're not sitting under boost for extended peroids of time force feeding the combustion chambers high pressures and heat with no break inbetween.
exactly. I’m about 625 rwhp at 8-9 psi with meth stock lt1 fuel system. 10k of running her pretty good. Adding lt4 fuel system and E85,gonna be in the 675 range. With the added fuel and Dsx lowside hoping it’ll hang in there for another 10k.lots of people at that level no issues. At 600 she’ll live a long time.
I am by no means an expert.
There is many knowledgeable guys here with more experience.
But I believe with stock internals at 600 rwhp you would be fine for many happy miles.
top shops will tell you up to 700 rwhp on a good tune is safe.
I do run a meth setup that is supposed to really help also and would recommend it .
