hai.........anybody in here run about 140mph, with the hks cams 264.
i did and my engine vibration shaking the whole car, is that normal?

 

probably experiencing fuel cut i suppose. Normal? Well yes i suppose it's normal but would you want it to keep happening? No.

 

I raced an M5 on the parkway til I think about 150mph+, I glanced down so quick I dont know exactly but I was redlined in 5th gear.. my car was suprisingly strong feeling, just ordinary vibrations! Oh yeah the M5 was still BEHIND me

 

fuel cut? how can a fuel cut can make the whole car shaking?

 

fuel cut makes the engine rock back and forward violently. Thus, the whole car shakes for a sec.

 

it shook at 140 or is it still shaking?

 

vibrate on the whole car body, but the power feel strong nothing change......it's just the vibration..........like the engine want to jump out from the car but something hold on it.
can you imagine that?

 

Who installed your cams? It sounds like a balance shaft may be out of time. It's not fuel cut if you have a Dynoflash. Sounds like a timing issue to me.

-Paul

 

I've went up to approx. 150 with 264's no problems here. I would not think fuel cut is the problem here imo.

 

cams install by the profesional.
by the way how can the balance shaft out of time?
educate me please..........

 

Did the vibration start during braking? Just a question since warped rotors will cause vibrations throughout the car very easily at that speed.

 

The timing belt turns a balance shaft. If during the cam install, the balance shaft were allowed to slip a tooth or two, or worse, if the timing belt were completely removed and the balance shaft were timed 180 degrees out of phase, then instead of preventing vibration it would add to it. Although you would probably notice the extra vibration at idle. There are really a lot of possilities for your problem:

Wheels/tires out of balance
Transmission problem
Balance shaft
Engine knock (if it were knock, your engine probably would have destroyed itself)

It is most certainly not fuel or boost cut. Those are taken care of by the dyno flash. There are probably several other possibilities that I haven't thought of. Do you notice any excessive vibrations at high RPM in lower gears? Anything else you can think of that might help?

-Paul

 

as long it hits around 125/130 above and somehow the whole car vibrate, but when you release your foot from the gas pedal right away when its vibrate the vibration is gone right away.

 

How many miles do you have on the car? It may just be a misfire due to old plugs. You may want to pull your plugs and inspect them. If they looked fouled I would replace them. If that doesn't help, then I'm not sure what the problem may be.

-Paul