Littlehorn

Swaybars are whiteline adjustable front and rear Front is set to the second softest setting out of 4 Rear is set to the softest setting out of 2 Tyres are 17 inch 255 rear and 235 front.

Hey, I have been slowly building up an R33 Gtst track car over the past 5 or so years. I feel that the car is just about where it needs to be in terms of upgraded/strengthened/adjustable parts now but i am having trouble dropping my lap times mostly due to oversteer. I am hoping there is some knowledge out there that you might be able to share with me. Here is a video of how the car goes at the moment which also should give you an idea of its handling characteristics. https://www.youtube.com/watch?v=PeUwsz22pOU and here is a basic rundown on the car and setup. It is a 96 S2 Gtst with a steel wheel holset core and about 240kw Interior - Stripped interior about 180kgs removed - 8 point roll cage Handling - Bilstein shocks valved for track work - Springs 350 front 550 rear - Ikeya formula front upper (front set to 3.2 negative) - Ikeya formula rear upper (rear set to 1.6 negative) - Ikeya formula rear toe (pretty sure toe was set to neutral) - Alloy subframe bushes - Polly bushes just about everywhere else - Nismo 2way LSD - Hicas Lock bar - Height adjustment set to about stock - 20mm spacers - Federal FZ201 semi slicks (about 34psi hot in front and 32psi in rear) There are other RWD cars running similar setups and power to weight lapping 3-4 seconds faster, now obviously the driver is going to have a big impact here, but looking at there videos they seem to have a lot more corner grip and stability.

There is no vibration at 5500rpm in neutral.

Here is a pic of my engine mounts, anyone know if this is normal?

I was running 10psi before turbo. Since the turbo was highflowed It has been running 8psi. Reason i am getting tuned is it felt weaker after the turbo install. But i did have the vibration before the turbo install.

I will check tonight but im pretty sure i get no vibration in neutral which i guess would rule out flywheel imbalance, and mean the problem lies somewhere from crankshaft forward. If the engine mounts are bad i would guess that i would get little vibration in neutral as there is no load on the engine correct? Other reason why i am suspecting possible tune issue has increased the vibration is that i have recently installed a new steel wheel turbo HRC internals in stock mounting position. Which may be aggravating the problem. Going in next wednesday to get a link installed and tune with someone who knows what they are doing, he will also be replacing the plugs and gaping them himself.

I changed the timing belt not long ago harmonic balancer appeared all good. Could the vibration be caused by a misfire only occuring at high rpms?

The transmission is actually new (second hand reconditioned). I had the same vibration before it was replaced. The other possibility is the gearbox mounting bush which is still standard not sure how squishy this should be. Or the engine mounts which are standard but i have no idea how to test there is little to no movement when i try to move engine by hand.

HI guys i have a 96 R33 gtst race car. I have been getting a vibration at speed for a little while which has increased recently and is now a real worry to me. Car has a nismo 2way lsd, solid subframe bushes, super pro front diff bushes. Car also hasnt been tuned running exhaust filter front mount and 10psi ebc (Going in for tune next week) Symptoms: Vibration is through the steering wheel and dash when i get into 4th. 1st and 2nd gear no vibration at any speed/rpm. 3rd gear vibration from ~5500rpm 125-130kmph 4th gear vibration from ~5500rpm 160kmph (Vibration is much heavier than in 3rd the whole dash feels like it is shaking up and down) Haven't managed to test 5500rpm in 5th gear as i run out of track but im assuming it would be the same problem. Things i have checked - Drive shaft u joints all look/feel good and are in alignment. - Steering rack has no play - Wheel bearings appear fine - Wheels have been thoroughly checked and they are in balance. - Car has been aligned Any ideas on what this could be?

Has anyone tried one of these? http://www.driftinnovation.com/en/hd170-action-camera Has similar features 1080P LCD External Mic Remote start