RoadRunnerZ28

hi there!


i am writing you from germany, my english is not good, but i hope you understand a bit

i have motor problems with my 1996 camaro z28 cabrio
the motor is tuned with a chip, treatment of the cylinder head and a stronger and better camshaft, and little other dings.
there should be about 320-330 HP

if i test the errormemory, everything seems to be ok, there is no error warning.

the us car scene in germany is small, there are not many experts, no one could tell me what is with my car. my car "expert" told me that everything is okay, but i dont believe.
the problem is that i am not a mechanican. i cant repair my car, i have to bring it away.

i need 8 second from 0 to 100 km/h
the endspeed is about 230 km/h and should be much more...

the normal speed with this motor should be about 5,5 seconds.
and endspeed about 260 km/h (or is this not correct?)

i have automatic


i hope u can help me?

greetings from germany

funina91ss

how many miles are on your car?Does it rev freely?You might need it tuned to the Cam you selected depending on size. Give us some more info on the car specs. gear ratio and stuff like that. Welcome to the Family to run a 142mph isnt that bad to me... but I guss a 160 would be faster.We go to gail around he if we get cought doing something like that.

Good Luck Sean

RoadRunnerZ28

the car has 43000 km...i dont know how many miles that are

the owner before me tuned the car, i buyed it complete 3 years ago. i dont know the gear ratio
the serial HP are 275 HP i think.

i also have a stroker kit inside, i dont know wich one. the chip is from hypertech.

funina91ss

I think you are going to have to take it to someone who can look at it and knows what they are doing.It could be a # of things.Again good luck

TobyZ28

You mentioned that 230 km/h is your endspeed, or top speed the car will do. Approximatly what RPM are you at when you are doing 230km/hr? I have a 1995 Z28 Automatic and after 230km/hr the speed climbs VERY slowly. I have not gone far beyond that as Highways here in Canada aren't quite like the Autobahn

With a CAM and other things you should be able to go beyond 230 BUT if your rear gears have been changed you might have difficulties reaching top speed.

"i need 8 second from 0 to 100 km/h" - How are you measuring this? Your speedometer is actually slightly behind your actual speed and you might very well be doing 0 to 100 a second or 2 faster than 8 seconds. If you have measured this time at a race track then there is definatly something wrong. 5.5 should be approximatly where you should be from 0-100 with your cam.

I hope this helps. Oh hey, I was born not far from Munich! I only know very little German tho, as I grew up here

RoadRunnerZ28

thank you all!

if i drive 230 kmh, the rpm is about 5500 i think

mayb your right with the speedometer. i have measuring with a stop clock in my hand during i step on the gas

might be a little dangerous )

TobyZ28

Well i'm quite sure about the speedometer not being 100% accurate when you look at the guages. A lot of people have mentioned that on the board before.

I have a feeling that your rear gears might have been modified with the car to give it more low end torque and you might be topping them out at 5500 rpm. Given that your engine is cammed, it might rev higher, but if your computer wasn't programmed properly it might not shift at the right locations or even have the limiter still on it.
Does your car shift at around 5700-5800 rpm (stock shift point on an 1995 A4) ?
I don't think your cars running bad as you think. I'm sure somone here can help you find out what gears you have by looking at the 5500 RPM & 230Km/H stat. I just dont know it off hand myself!

RoadRunnerZ28

yes, i think so to that the rear gears are modified. but i dont know the correct gear ratio.

i must ask my expert and hope he can tell it me.

when i make a kickdown, the car shifts at 5500 rpm

a year ago it shifts by 6000 rpm, but my expert told me its not good for the motor, i will blow him up if i do this many times.
so he changed it to 5500 rpm

i think i should reset the chip and everything and my expert should config everything new....

TobyZ28

Well there you go Because your rear gears were swapped out for ones with a higher ratio to give you more power off the line and accellerating, your top speed has been reduced slightly. With your rpm also reduced to 5500 it has also been reduced a bit more as well.
shifting at 5500 is better than 6000 in terms of the life of your engine, but because your car is cammed and has other "goodies" it might very well be OK shifting at 6000. Ideally you want the car to shift near the peak of your power curve, and your cam shifting below that peak might be reducing your accelleration slightly and limiting your top speed when your going fast. This is all to save your engine some extra wear. I would say that you can safely raise your shift point up to 5800 to help your accelleration and you might want to talk to your engine builder about your maximum RPM as well. My car is almost all stock parts and i shift around 5800 and it doesnt seem to have any problems at all. Again, IF your CAM was designed to shift best around 5500 then your engine builder is right, but to me most CAMs people put in their car give them more power at a slightly higher than stock RPM like 6000 or 6500 rpm.

I think your car is "running" fine and is possibly just shifting in the wrong place and is definatly topping out at 230 because of your gears.