Let me give you a bit of back story. Really looking for some help on what do here. Long post warning!
Bought this car a year ago now. Did over 1300 miles with her on track this year and could not be more happy with the cars performance. You can read the mods I have in my build thread but quick summery she is fully built. Car runs near perfectly however I am running into and issues and I am not sure where to go with it. Not like I can go test a solution as the car only does this at 135ish mph +. I think the trans has a new clutch, new flywheel and a MGW race spec shifter. Motor is super built and almost 80% all new. Ok here is what I have going on.
Road America is very fast.. thanks for clearly that up Andy.
So going down the front straight.... In 5th gear... the car will start a very noticeable FULL car vibration. Not in the wheel, not in dash or a panel. The WHOLE car. I can feel it in my ass. Now I have not tried to push through this as well if something goes.. I am doing near 140 mph. What I have done is shift into 6th gear to try and see if that would do it and the car goes into limp mode. Yep motor goes down to 2k rpm and I need to come off track. Turn the car off and then turn it back on and everything is great. Keep that in mind it also has that going on.
Hear are my thoughts and let me know what you think.
Possibly a transmission issue or driveline issue?
Aero issue? Air getting trapped in the car?
Something else rotating? Brakes are all brand new. Wheels are balanced and have been rebalanced.
I have a friend with a GT350 race car that was also experiencing this same thing. He had the stones to keep pushing the car to 150+ and the vibration went away. In his case was it a aero issue?
With my 6th gear issue I am not really able to push as I am getting close to maxing out 5th gear at around 140+
Please give me any and all input you guys have. Road America is my favorite place to be in the world and this is really hurting me. Got some goals I am trying to get and they are not possible with this issue.
Andy
Bought this car a year ago now. Did over 1300 miles with her on track this year and could not be more happy with the cars performance. You can read the mods I have in my build thread but quick summery she is fully built. Car runs near perfectly however I am running into and issues and I am not sure where to go with it. Not like I can go test a solution as the car only does this at 135ish mph +. I think the trans has a new clutch, new flywheel and a MGW race spec shifter. Motor is super built and almost 80% all new. Ok here is what I have going on.
Road America is very fast.. thanks for clearly that up Andy.
So going down the front straight.... In 5th gear... the car will start a very noticeable FULL car vibration. Not in the wheel, not in dash or a panel. The WHOLE car. I can feel it in my ass. Now I have not tried to push through this as well if something goes.. I am doing near 140 mph. What I have done is shift into 6th gear to try and see if that would do it and the car goes into limp mode. Yep motor goes down to 2k rpm and I need to come off track. Turn the car off and then turn it back on and everything is great. Keep that in mind it also has that going on.Hear are my thoughts and let me know what you think.
Possibly a transmission issue or driveline issue?
Aero issue? Air getting trapped in the car?
Something else rotating? Brakes are all brand new. Wheels are balanced and have been rebalanced.
I have a friend with a GT350 race car that was also experiencing this same thing. He had the stones to keep pushing the car to 150+ and the vibration went away. In his case was it a aero issue?
With my 6th gear issue I am not really able to push as I am getting close to maxing out 5th gear at around 140+
Please give me any and all input you guys have. Road America is my favorite place to be in the world and this is really hurting me. Got some goals I am trying to get and they are not possible with this issue.
Andy
