Quote:
Originally Posted by Stielow
Jeff
The last 3 builds were no paint required and two were stock engines. I loved Gunner with the stock LT4. That car worked great. I was going to swap it over to LT5 power but I chose to build a whole new car instead.
What's new....
I want to try the new LT5 set up. The Direct Injection in the newer LT engines work great. I was going to leave the LT5 stock then I started to talk to Katech and see the work they are doing with the LT5 stuff.
JackAss 2.0 with the 427 LS9 on E85 ran great. It made 970 HP on E85 and never overheated. I think we can do the same with a LT5 at 6.2 Liters on E85.
On every build we learn something new and I'm just evolving the builds as I go along. Yes it would have been easier to just do another Big LS9 but I've done a few of those now and want to do the LT5. Everything has some small tweeks to fix issues we found on earlier builds.
Some examples:
Hellfire had brake cooling ducts and JA 2.0 did not and Gunner did not. I found out I need brake cooling ducts. JA 2.0 with ABS and Carbon Brakes killed brake pads as well as Gunner with Iron rotors. Matt and I have a new system we hope works.
I finally added data logging to the diff and transmission on Gunner and the data shows I do need to diff cooler if you wan to run more than two 20 minute sessions on a open track day. The transmission did not get as hot but we cool it also. (I will keep the data logging feature on the new build)
The combination of a C&R cooling stack on a stock LT4 will allow you to run a 20 min session on an open track day. Add E85 on the high output stuff and it will also keep things in check. I ran JA 2.0 on a 85 degree day hard and the oil temp was 260 F and the water was 210 F.
E85 fuel is cheap and keeps everything cool on track.
Downside to flow enough fuel (E85) to support 970ish HP you need 2.1 Gallon a Min at 60 PSI. Seem simple right? Try making it work at 1/2 a tank.. This is where I spent a lot of time on the phone with Carl Casanova from VaporWorx. After 5 attempts we got a solution on JA 2.0. 2 complete Hellcat fuel systems controlled by one VaporWorx controller.
Matt at Sled Alley has been key to all the iterations. We evolved the oil dry sump system to the point I feel we have a viable solution. By modifying a Peterson 2 gallon tank to 3 gallon we do not have any oiling issues. Hiding it in the cowl is cool but time consuming.
Driveline angles, we move the trans tunnel up 1.5 inches to get a 1 degree angle on the engine. Seems easy but a lot of fab work.
Just a ton of small details. I enjoy the build and new challenges. New parts and technologies are coming along all the time.
If all goes well I hope to have this car on track in Aug. 2020.
Thanks
Mark
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Awesome details. Thanks for sharing Mark.