I have a 1993 Z28 Camaro.
Ive heard these things top out at ya know the 150+ mph range.
I heard they can do 140 easy.
Now when Im in my car, I get to about 115.
My car starts shaking a vibrating.
Not like a violent shake to where Ill lose control.
But a shake to where i have to slow down a bit to get it to go away.
My question is...
What are the possible reasons for this shaking?
Ive seen a couple people have the same problem too.
Oh and its a stock LT1, except for exhaust and a performance chip.

 

A couple of possibilities are tire imbalance or driveshaft imbalance.

 

tire vibrations are usualy felt at lower mph but driveshaft virations come on at higher mph.jack the car up ,put it in park or gear and make sure the ebrake isnt applied,then pry at the driveshaft with a prybar or huge screwdriver near the u-joint while looking for ANY play inbetween the ujoint and the ujoint cap.same for front and rear ujoint.also grab the driveshaft at the front ujoint and give it a good shake back and forth while looking for play where the yoke sits inside the tailshaft of the trans.it might move a slight bit(say 1/32)and thats normal,but if that thing moves a 1/8 of an inch like mine did youll need a new tailshaft bushing.also look for trans fluid leaking from the tailshaft,that is a dead giveaway that the bushing is shot.this will cause a high speed vibration as well.also check for dings or places where spot welded on weights might of been knocked of on the driveshaft.as a rule of thumb with driveshafts i like to get the balance checked after i change ujoints and if that all checks out clear then get the tires looked at.be carefull untill this is fixed,you dont want to loose a driveshaft at 115 mph!and yes these cars go about 150-160 in stock form with the fuel cutoff disabled.i lost a girlfriend that way!

 

the easiest way to fix that problem is to not drive so fast, your going to kill someone seriously i know from experience

you could also try to put a hose clamp on the driveshaft and see if it is any better, if its worse rotate it 180 and try again, its pretty much trial and error

 

What would a hose clamp do?

 

add weight to one side, therefor balancing the driveshaft

 

I really wouldn't go attaching things like a hose clamp to the driveshaft.............that's not quite the right way to go about balancing it.

Getting it professionally balanced or simply getting an aluminum shaft is the safe way.

 

thats the dumbest idea ive ever heard!!!

 

I would not recommend this method.....

I replaced my 93Z steel shaft with an aluminum shaft..... There were issues with the steel shafts causing vibration above 60~70 MPH.... If your 93Z had the option of Z rated tires, then those speeds are possible... But if not, then you have to reprogram the computer and remove the limiter..

I have had mine clocked at 154~156 MPH, confirmed by radar(+/- 1mph), and in a controlled enviroment...

 

Hose clamps are the diagnostic method given by the professional engineers who wrote the FSMs for almost every RWD car I've owned, including my LT1 vette. In fact, in the vette FSM the hose clamps are not only given as the diagnostic method, but also as the final solution.

Presumably a professional mechanic would follow the FSM and/or common practice, both of which say to use hose clamps.

 

thank you, i was hoping someone who actually knew what they were talking about would chime in here before i responded

sometimes this forum amazes me with peoples stupidity, and how no matter what they are always right

 

I'll admit that I don't know everything there is to know about everything, and I'll still be learning to the day that I die. However, this in no way means that I'm stupid, rather it's simply a lack of knowledge about certain subjects.

I'm here to help as much as I can, as you are to and if you have professional education about balancing drive shafts with hose clamps, then I'm more than willing to admit that I was wrong.

However it's clear what kind of human being a person is when they start name calling in a help tech forum. If you disagree with that, then this time you're the one who is wrong.

 

My guess is that he wasn't aiming that jibe at you. The genius who said "that's the dumbest idea I've ever heard" fits the description better.

It is better to not say things like "that's not the right way to do X" when you don't know that to be a fact. A better way to say it might be something like "that doesn't sound like a good idea to me."

I'm sure, being an electrician, that you can relate to knuckleheads giving non-code-compliant household wiring advice. I spend a fair amount of time on electrical forums so I know how that is...

 

Key word; Professional You did not mention that..... So, who's stupidity comes to play???????

You need to be more informative about the information you give.... Most here are not familiar with that technique.....

 

exactly, sorry panda. but like stated here if you are not sure of what you are talking about maybe you should not tell someone else they are wrong if you yourself dont know