C5 down on power
Thread Starter
Instructor
Joined: Mar 2004
Posts: 150
Likes: 0
From: Allen TX
C5 down on power
Gentlemen,
I own an 02, MN6, Z51 coupe and, after working on my old man for a couple of years, he finally gave in and bought a beautiful red-on-red 04, MN6 Z51 coupe last September. After I drove his car, it felt soft compared to mine. So, this past weekend, we broke out the GTech and ran the numbers: My car 294 hp
, his car 261 
So, the objective data backed up the subjective impressions. What could be causing this? The car runs great, sounds good, gets good mileage, no check engine lights, MAF is clean/clear, and both cars are stock.
Thanks,
Bullman
I own an 02, MN6, Z51 coupe and, after working on my old man for a couple of years, he finally gave in and bought a beautiful red-on-red 04, MN6 Z51 coupe last September. After I drove his car, it felt soft compared to mine. So, this past weekend, we broke out the GTech and ran the numbers: My car 294 hp
, his car 261 So, the objective data backed up the subjective impressions. What could be causing this? The car runs great, sounds good, gets good mileage, no check engine lights, MAF is clean/clear, and both cars are stock.
Thanks,
Bullman
Last edited by Bullman; Jul 23, 2007 at 04:06 PM.
Thread Starter
Instructor
Joined: Mar 2004
Posts: 150
Likes: 0
From: Allen TX
Hmmmmm....
Possible culprits we have discussed include:
1) Clogged fuel filter (I hope not, as this is a pain to fix on the 04's)
2) Clogged injectors
3) Engine is pulling timing for one reason or another
4) One or maybe two cylinders is not firing to its full potential
5) ???
Possible cures:
1) Fuel system cleaner (Techron)
2) New spark plugs/wires
3) Dyno tune?
4) ???
I am hopeful that a few of guys have dealt with a similar issue and can offer some good suggestions. I can tell my Dad does not like having the slower Corvette...
Bullman
Possible culprits we have discussed include:
1) Clogged fuel filter (I hope not, as this is a pain to fix on the 04's)
2) Clogged injectors
3) Engine is pulling timing for one reason or another
4) One or maybe two cylinders is not firing to its full potential
5) ???
Possible cures:
1) Fuel system cleaner (Techron)
2) New spark plugs/wires
3) Dyno tune?
4) ???
I am hopeful that a few of guys have dealt with a similar issue and can offer some good suggestions. I can tell my Dad does not like having the slower Corvette...
Bullman
Instructor
Joined: Jan 2005
Posts: 102
Likes: 0
From: Oklahoma
Is the same person Testing the cars, could all come down to your type of tires.
Now if you have the 1st Gtech without the dyno and etc the 2nd Gtech has the dyno and the graph and plug and play so you can download onto a computer and than you can see whats really happening.
Maybe the car needs a tune up most people don't tune up there cars thats why they buy and sale them when there a few years old. Good luck.
Now if you have the 1st Gtech without the dyno and etc the 2nd Gtech has the dyno and the graph and plug and play so you can download onto a computer and than you can see whats really happening.
Maybe the car needs a tune up most people don't tune up there cars thats why they buy and sale them when there a few years old. Good luck.
Thread Starter
Instructor
Joined: Mar 2004
Posts: 150
Likes: 0
From: Allen TX
Yes, I drove both cars on the same day so the driving was equally good/bad. Tires are different with his car on 275 Kumho ASX's, and mine on 295 Goodyear Eagle F1's. I don't understand how tires could have made that amount of difference.
I have the original GTech and cannot download graphs etc. However, the car feels softer at all RPM's. It does not launch as hard or pull to redline as quickly. For example, I was dumping the clutch from 2500 RPM and getting almost no wheelspin. Try that in my car and
I agree that a good tune up could not hurt and we will probably do that regardless.
I have the original GTech and cannot download graphs etc. However, the car feels softer at all RPM's. It does not launch as hard or pull to redline as quickly. For example, I was dumping the clutch from 2500 RPM and getting almost no wheelspin. Try that in my car and
I agree that a good tune up could not hurt and we will probably do that regardless.
