Dec
R & D, Tech Spotlight
Transforming a Corvette C8 with the GPI 625 Package!
Initial Assessment and Goals
Our objective was clear from the start: to elevate the Corvette C8 and the LT2 platform beyond the standard power-adders, focusing on a naturally aspirated (NA) setup for consistent, reliable, robust performance without the additional weight and heat soak issues associated with forced induction.
Dyno Testing: Establishing a Baseline
With just about 2,500 miles on it, our test C8 Corvette showed promising potential on our dyno, recording 498 horsepower (449 RWHP) and 485 lbft of torque (437 RWTQ). After some initial tuning adjustments, we were ready to dive deeper into the modifications and product development.
Step-by-Step Upgrades: The Path to Power
The transformation of the Corvette began with the installation of a set of Kooks Headers, marking the first significant leap in power, as the car achieved 517 horsepower (466 RWHP).
This was followed by the addition of the Haltek Air Box, which further increased the output to 528 horsepower (476.5 RWHP).
The project then moved into a more comprehensive phase with engine modifications, involving the porting and milling of the factory LT2 cylinder heads, which significantly improved the compression ratio. The final touch came with the intake and throttle body modifications, done alongside our new LT2 camshaft, propelling the horsepower to an impressive 596 (537 RWHP)!
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GPI – LT2 Cam (Gen 5)$469.00
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GPI – Ported OEM LT2 (Gen V) Cylinder Heads PackageFrom: $1,095.00
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Chevrolet Performance – LT2 Intake Manifold Package (12697714)Varies Based on Options
The E85 Transformation
The transition to E85 fuel with a DSX flex fuel kit was a turning point, boosting the power to an incredible 625 horsepower (564 RWHP) and torque to 569 lbft (513 RWTQ), ensuring seamless performance with no compromises in drivability.
Introducing the GPI C8 Corvette 625 Package
This entire suite of modifications, collectively known as the GPI C8 Corvette 625 Package, represents a pinnacle in Corvette C8 customization. It’s a testament to our commitment to R&D and innovation.
Conclusion: A New Era for the Corvette C8
The GPI C8 Corvette 625 Package is not just a set of upgrades; it’s a complete transformation of what a Corvette C8 can achieve. We’re proud to share this complete LT2 performance package with the automotive community and look forward to pushing the boundaries of the platform even further.
Stay tuned for more updates and thank you for being a part of this journey!
Just wanted to write in due to everyone is always so fast to write bad things that happen with these builds. I watched a Video that Ryan put out on the LS3 kit. I have a 2010 Camaro SS had 35k miles on it when I bought it. Has an automatic transmission, I had the good old 6.2 LS L99. I bought the I whole kit to swap to a LS3 . I did reuse that factory oil pump due to I felt like I have plenty of oil pressure hot or cold good oil pump. Purchased everything else Ryan mentioned on the Video, cam ( SS3), gmhp lifters , springs, cam plate, chain, dampene (dog bone), ARP head bolts , everything on the list he recommended. Since I’ve built and tuned with a PTC 3800 to 4000 converter and still running the 3:27 gear in the rear, working on the 3:91 gear and posi unit now. The car also has 1 7/8” long tube headers and cold air intake. The reason I’m writing in is to let the whole GPI group that they stand alone in customer service, advise, RECOMMENDATIONS, and most of the performance that this combo of parts made to this car. It started as I said a stock L99 and I left the bottom end as I found it in good shape with 35k miles on it. It dyno at 465 to the tire after all these parts were installled. I did put a smaller pulley on the crank (25%) underdrive, the rest is stock, I’ve got more complements on the cam sound than any other cam I’ve ever had, that’s not all the cam does , I have run many cars with more cubic inches and more performance parts molars, fords and others. The car is like a different car with this kit Ryan talked about, I’m very happy and very satisfied with everything l bought , everything I needed was in the kit, didn’t have to run around looking for little parts to finish the build they were all there down to the new crankshaft pulley bolt. 465 hp does not set the world on fire but you go from a little less than 300 to 465 with these parts alone and you can tell that you spent your money in the right place. Just thought I would talk about the good things also, everyone is quick to talk about the bad things well I got to say are good things, when I do more or do this build to another car it will have 100% GPI PARTS AND SUPPORT. Thanks for listening.
Hello I was looking at this 600 horsepower package for the C8 Corvette that you guys offer. I have a lot of similar components all I would need is for the vehicle to be tuned on flex fue ldo you guys offer that? If so is there a Transit package that can get it to your facility?
I’m looking to do the entire package for the C8, heads, cam, headers, e-85, I’d like to have you guys get and install the intake from Lingenfelter, plus the cold air box. I’m looking at having the car super reliable but with close to 600 rwhp. Please respond to this message so I can set up my budget for it. I am open to suggestions on additional items you guys believe would be of benefit for my build but I’m trying to stay under $25,000 if possible. I’d like to get started as soon as possible. Thanks!
Rich
If you would email us at support@gwatneyperformance.com so we can get more info from you and setup a date and time to be able to get you in