RPM question
Thread Starter
Instructor
Joined: May 2010
Posts: 230
Likes: 2
From: indianapolis Indiana
6000 rpm in 3rd gear? are you serious. the rear end feels so light. i feel like its going to go sideways even at 3000 rpm
Race Director
Joined: Jul 2007
Posts: 18,681
Likes: 47
From: Reno is so close to Hell you can see Sparks , State Of Confusion
St. Jude Donor '12-'13-'14
Team Owner
Joined: May 2006
Posts: 21,473
Likes: 356
From: Palmdale, Ca----- 2009 Cyber Gray 4LT A6 F55 452 RWHP 422 RWTQ- RIP 1998 C5 734 RWHP & 585 RWTQ-----
Can you please elaborate on what kind of ENGINE PROBLEMS's?
Your statement sounds like a huge blanket statement and very knowledgable, I think you might owe an explanation of some sort.
If indeed he does have serious "ENGINE" problems as you state then I believe you need to state what they are or if you have first hand experience with the same problem please offer a solution and not just some off the wall statement to make your posts go up.
This is the Tech section and owners need sound serious advice on how to repair a problem and not cause more with statements like yours.
Thanks,Matt
Pro
Joined: Jul 2008
Posts: 666
Likes: 2
From: Weston WV
my only curiosity is How is shifting early ENGINE problems, wouldn't that be a TRANS issue.
interested to see results once you turn T/C off your car shouldn't shift until abotu 6K under wide open throttle.
interested to see results once you turn T/C off your car shouldn't shift until abotu 6K under wide open throttle.
Racer
Joined: Feb 2010
Posts: 388
Likes: 0
From: Effingham IL
Mr Bill is on to somthing!!!!! I almost bet that the larger wheels are the problem.. On my handheld tuner it has wheel size ajustments for speedo and shift points for adding larger wheels. By the way in bone stock form my 2001 a4 shifted at 5,800 at wot no matter what i did.
Racer
Joined: Apr 2010
Posts: 385
Likes: 0
From: Corona California
It's a high performance car it's probably been driven hard! maybe too hard?, and could have some sort of engine damage, i had a 90 Z28 and let the oil get a little old and my girlfriend drove it hard and after awhile it wouldn't rev out, just like what he describes, i'm no mechanic just stating an opinion just like everyone else, why is everyone so quick to jump on people's **** on here? take it to a mechanic!!!, most people like me on forums don't know ****!.
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Pro
Joined: Dec 2009
Posts: 688
Likes: 18
From: Seattle Wa
It's a high performance car it's probably been driven hard! maybe too hard?, and could have some sort of engine damage, i had a 90 Z28 and let the oil get a little old and my girlfriend drove it hard and after awhile it wouldn't rev out, just like what he describes, i'm no mechanic just stating an opinion just like everyone else, why is everyone so quick to jump on people's **** on here? take it to a mechanic!!!, most people like me on forums don't know ****!.
Race Director
Joined: Apr 2005
Posts: 11,138
Likes: 11
From: Fremont CA
St. Jude Donor '06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16-'17-'18-'19-'20
NCM Sinkhole Donor
Your problem is not a traction control issue.
First of all, your car would show on the DIC screen "TRACTION CONTROL ACTIVE" and you have never seen that.
Secondly, even if you are so focussed on the rest of the world that you missed the message, I did a delta calculation on the tires you are using. The front to rear ratio is only 0.3% off from the factory delta. You have to be over 1.2% to fool the computer into thinking you are having slippage.
Take your car to a shop that can reprogram the shift points and call it a day.
One more thing, take your car on the freeway, put it in 3rd gear, and set the cruise control at 70mph. Take note of the RPM's, and report back here.
First of all, your car would show on the DIC screen "TRACTION CONTROL ACTIVE" and you have never seen that.
Secondly, even if you are so focussed on the rest of the world that you missed the message, I did a delta calculation on the tires you are using. The front to rear ratio is only 0.3% off from the factory delta. You have to be over 1.2% to fool the computer into thinking you are having slippage.
Take your car to a shop that can reprogram the shift points and call it a day.
One more thing, take your car on the freeway, put it in 3rd gear, and set the cruise control at 70mph. Take note of the RPM's, and report back here.
Thread Starter
Instructor
Joined: May 2010
Posts: 230
Likes: 2
From: indianapolis Indiana
Ok. I think i found the problem
I drove it this morning with traction control off. I noticed following
1. If i push gas pedal to floor : it goest up upto 3000 rpm and changes gear. engine makes roaring sound and it accelerates slowly
2. if i accelerate it gradually it went up to 5000 rpm. it accelerates like a very fast
I put it in 3rd gear and tried to merge into highway and rpm went upto 5500 with traction coltrol on.
I drove it this morning with traction control off. I noticed following
1. If i push gas pedal to floor : it goest up upto 3000 rpm and changes gear. engine makes roaring sound and it accelerates slowly
2. if i accelerate it gradually it went up to 5000 rpm. it accelerates like a very fast
I put it in 3rd gear and tried to merge into highway and rpm went upto 5500 with traction coltrol on.
Racer
Joined: Apr 2010
Posts: 385
Likes: 0
From: Corona California
Ok. I think i found the problem
I drove it this morning with traction control off. I noticed following
1. If i push gas pedal to floor : it goest up upto 3000 rpm and changes gear. engine makes roaring sound and it accelerates slowly
2. if i accelerate it gradually it went up to 5000 rpm. it accelerates like a very fast
I put it in 3rd gear and tried to merge into highway and rpm went upto 5500 with traction coltrol on.
I drove it this morning with traction control off. I noticed following
1. If i push gas pedal to floor : it goest up upto 3000 rpm and changes gear. engine makes roaring sound and it accelerates slowly
2. if i accelerate it gradually it went up to 5000 rpm. it accelerates like a very fast
I put it in 3rd gear and tried to merge into highway and rpm went upto 5500 with traction coltrol on.
your car should rev past 5,500 in any gear with or without traction control on, take it to a mechanic please!
Thread Starter
Instructor
Joined: May 2010
Posts: 230
Likes: 2
From: indianapolis Indiana
Is it ok to drive the car like that?
Team Owner
Joined: May 2006
Posts: 21,473
Likes: 356
From: Palmdale, Ca----- 2009 Cyber Gray 4LT A6 F55 452 RWHP 422 RWTQ- RIP 1998 C5 734 RWHP & 585 RWTQ-----
Ok. I think i found the problem
I drove it this morning with traction control off. I noticed following
1. If i push gas pedal to floor : it goest up upto 3000 rpm and changes gear. engine makes roaring sound and it accelerates slowly
2. if i accelerate it gradually it went up to 5000 rpm. it accelerates like a very fast
I put it in 3rd gear and tried to merge into highway and rpm went upto 5500 with traction coltrol on.
I drove it this morning with traction control off. I noticed following
1. If i push gas pedal to floor : it goest up upto 3000 rpm and changes gear. engine makes roaring sound and it accelerates slowly
2. if i accelerate it gradually it went up to 5000 rpm. it accelerates like a very fast
I put it in 3rd gear and tried to merge into highway and rpm went upto 5500 with traction coltrol on.
HP Tuners is one of the best to use, your local Vette shop should use this and can jog it on the dyno and reinact your conditions or do it on the stree/freeway safely. It almost sounds like it is going into limp mode.
Have you tried to pull any codes off the PCM from your DIC? (Sorry if I missed it)
Thanks,Matt
Race Director
Joined: Apr 2005
Posts: 11,138
Likes: 11
From: Fremont CA
St. Jude Donor '06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16-'17-'18-'19-'20
NCM Sinkhole Donor
Are you serious? You bought a Corvette and don't want to pay to fix it? Something is seriously wrong with the programming in your car. I would be taking it to a local shop that specializes in dyno tuning or street tuning Corvettes. Pay the $300-$500 and have them do a full tune on the car. It will run better, produce more power, get better gas mileage, and SHIFT WHEN IT IS SUPPOSED TO.
Team Owner
Joined: May 2006
Posts: 21,473
Likes: 356
From: Palmdale, Ca----- 2009 Cyber Gray 4LT A6 F55 452 RWHP 422 RWTQ- RIP 1998 C5 734 RWHP & 585 RWTQ-----
Just find a local Corvette Late model GM shop that has a dyno and HP Tuner software. The tuner will know what to do and it should be relatively inexpensive.
Thanks,Matt
Race Director
Joined: Apr 2005
Posts: 11,138
Likes: 11
From: Fremont CA
St. Jude Donor '06-'07-'08-'09-'10-'11-'12-'13-'14-'15-'16-'17-'18-'19-'20
NCM Sinkhole Donor
I was just thinking - another possibility is a partially clogged fuel filter. If the filter is restricting fuel flow, it's just like letting off the throttle - in which case the car will upshift.
Try this - put the car in second gear and try seeing what happens when you hit wide open throttle. Does the car keep going up to 5k+ RPM's when locked in second? Or does it bog down at 3k like always?
If it bogs down at 3k in 2nd gear, that would point toward a fuel issue rather than just a shift point issue.
Second - try this (already said it, but you didn't do it)...
Take your car on the freeway
Get up to 70 mph
Hit Cruise control to maintain 70
Change car into 3rd gear
Look at the RPM's and report the exact RPM's back here.
This will tell us if the rear end ratio has been changed. If it was and the person never reprogrammed the computer, that could cause shift point problems.
Just a couple things worth looking at before you pay someone else to do it.
Try this - put the car in second gear and try seeing what happens when you hit wide open throttle. Does the car keep going up to 5k+ RPM's when locked in second? Or does it bog down at 3k like always?
If it bogs down at 3k in 2nd gear, that would point toward a fuel issue rather than just a shift point issue.
Second - try this (already said it, but you didn't do it)...
Take your car on the freeway
Get up to 70 mph
Hit Cruise control to maintain 70
Change car into 3rd gear
Look at the RPM's and report the exact RPM's back here.
This will tell us if the rear end ratio has been changed. If it was and the person never reprogrammed the computer, that could cause shift point problems.
Just a couple things worth looking at before you pay someone else to do it.
Race Director
Joined: Jul 2007
Posts: 18,681
Likes: 47
From: Reno is so close to Hell you can see Sparks , State Of Confusion
St. Jude Donor '12-'13-'14
It's a high performance car it's probably been driven hard! maybe too hard?, and could have some sort of engine damage, i had a 90 Z28 and let the oil get a little old and my girlfriend drove it hard and after awhile it wouldn't rev out, just like what he describes, i'm no mechanic just stating an opinion just like everyone else, why is everyone so quick to jump on people's **** on here? take it to a mechanic!!!, most people like me on forums don't know ****!.
Le Mans Master
Joined: Apr 2003
Posts: 6,001
Likes: 0
From: Palm Bay FL
St. Jude Donor '05-'06-'07-'08-'09-'10-'11
WOW
I got dizzy just trying to read this thread. Shifting at 3000 RPM is a problem. All I can say my A4 2:73 rear end shifts in to 3rd around 105 mph. 
I got dizzy just trying to read this thread. Shifting at 3000 RPM is a problem. All I can say my A4 2:73 rear end shifts in to 3rd around 105 mph.