automatic hits revv limiter before shifting?
03-18-2011, 07:07 PM
#1
Teching In
Thread Starter
Join Date: Mar 2011
Posts: 10
Likes: 0
Received 0 Likes
on
0 Posts
automatic hits revv limiter before shifting? hey i just bought this 02 z28 about 2 weeks ago and seems like everytime i stump it it hits revv limiter going out of first gear and its a automtaic.. also the other night i was on the highway and kicked it and when it downshift it bounced like crazy for a couple sec's then shifted.. it has headers mufflers and slp air box.. im thinking something may has played with the shift points what do yall think??
03-18-2011, 07:40 PM
#2
Launching!
Join Date: Sep 2009
Location: SOUTH CAROLINA
Posts: 260
Likes: 0
Received 0 Likes
on
0 Posts
Hi,you need to make some adjustments!!your max hp/tq is about 5250 rpm's.
However, you will probably shift at about 5750-5900 rpm's and receive max benefits from your car. To many rpm's equals catastrophic failure to your engine. Drive smart and enjoy your ride....have a blessed weekend......
Captain jim
03-19-2011, 02:49 AM
#3
Launching!
Join Date: Feb 2004
Posts: 260
Likes: 0
Received 0 Likes
on
0 Posts
Sounds like someone,
hasn't calibrated your txmsn WOT shift parameters correctly.
To have this problem means it isn't on a factory tune; you'll need to find who's altered the PCM and get it sorted properly.
hasn't calibrated your txmsn WOT shift parameters correctly.
To have this problem means it isn't on a factory tune; you'll need to find who's altered the PCM and get it sorted properly.
03-19-2011, 02:55 AM
#4
same problem i had with my car when i bought it. the dumb owner before me had a hypertech tune in there with the shift points changed all crazy and the redline set at like 6800 on a stock top end!!! just get your shift points changed by a tuner or handheld tuner
03-19-2011, 09:51 AM
#5
Maybe someone has the shift points set too high but every once in a while I will see one that is doing this and the tune is ok but the trans flares or is lazy to complete the shift until several hundred rpm later.
If you do not have access to tuning software or someone to look at your calibration try scanning it first. With any decent scan tool, log the shift commands and make sure the trans is not getting weak or slipping before making the shift.
If you do not have access to tuning software or someone to look at your calibration try scanning it first. With any decent scan tool, log the shift commands and make sure the trans is not getting weak or slipping before making the shift.
Last edited by DynoDR; 03-21-2011 at 09:11 AM.
03-20-2011, 10:34 PM
#7
Teching In
Join Date: Jan 2011
Posts: 8
Likes: 0
Received 0 Likes
on
0 Posts
My old z28 started doing that and continued to get worse. Once i rebuilt the tranny it never happend again. this was a bone stock car down to the factory paper filter and original tires when i bought it.
Trending Topics
03-21-2011, 07:31 PM
#9
Teching In
Thread Starter
Join Date: Mar 2011
Posts: 10
Likes: 0
Received 0 Likes
on
0 Posts
thanks guys. im going to try to find someone that has a programmer bc its shiftin at like 6500 rpm lol imma just manual shift or not get on it. pray its not my transmission bc i seriously dont got money lol with having to pay for school and car payment lol.. ill have a automatic trans class in summer so maybe i can fix it for cheap if it is bad lol just gonna BABY it lol but its so hard to do..
03-21-2011, 07:50 PM
#10
Do not manually shift your automatic or you will be buying a new one. It's as easy as not getting on it till the problem is fixed. Every stock AT car I have seen has hit the limiter on the 2-3 WOT shift. I usually adjust the rev limiter up a few hundred RPM's to fix this. All you need to do is get it tuned, but first check your fluid to make sure that it is serviced properly.
03-24-2011, 11:50 AM
#13
Teching In
Thread Starter
Join Date: Mar 2011
Posts: 10
Likes: 0
Received 0 Likes
on
0 Posts
yep transmission is messed up now its having trouble shifting into 2rd.. changed transmission fluid and filter not much improvement. just gonna baby it till i can do different.
03-24-2011, 02:21 PM
#14
On The Tree
iTrader: (2)
Join Date: Jan 2007
Location: Rochester Ny
Posts: 140
Likes: 0
Received 0 Likes
on
0 Posts
Mine was doin the same thing as u describe. Tried tuning and tuning and it didnt help. It kept gettin worse and finally the tranny
took a **** on me. Ordered up a FLT Stage IV...Problem solved
took a **** on me. Ordered up a FLT Stage IV...Problem solved
03-25-2011, 09:30 AM
#15
TECH Addict
iTrader: (10)
Join Date: Jun 2004
Location: Commerce Twp, MI
Posts: 2,918
Likes: 0
Received 0 Likes
on
0 Posts
Funny how everyone assumes it's tune related in the first bit of this thread. 
What I would do...
1) Read the tune. If you find someone who has tuning software, this is free. It only costs money to change/upload a tune in most cases. This will tell you if the tune has been altered and how.
2) Start saving money now. It's likely that the trans has seen some miles (maybe not as many easy ones as you may have thought) and the clutch packs and/or bands are worn. If the tune comes back looking stock or within reason, you're going to need the money you've been saving.
3) Start looking for trans shops in your area. If you drive this car as hard as it sounds like you do, then you're going to want to make friends with them now.
4) If by chance it is all in the tune, convince the person with the software from step 1 to retune your trans settings for $150~200. It's super easy to tune a trans - especially on a car that hasn't been heavily modified. Most of the stock tables work great.
What I would do...
1) Read the tune. If you find someone who has tuning software, this is free. It only costs money to change/upload a tune in most cases. This will tell you if the tune has been altered and how.
2) Start saving money now. It's likely that the trans has seen some miles (maybe not as many easy ones as you may have thought) and the clutch packs and/or bands are worn. If the tune comes back looking stock or within reason, you're going to need the money you've been saving.
3) Start looking for trans shops in your area. If you drive this car as hard as it sounds like you do, then you're going to want to make friends with them now.
4) If by chance it is all in the tune, convince the person with the software from step 1 to retune your trans settings for $150~200. It's super easy to tune a trans - especially on a car that hasn't been heavily modified. Most of the stock tables work great.
03-25-2011, 04:37 PM
#16
Funny how everyone assumes it's tune related in the first bit of this thread.
What I would do...
1) Read the tune. If you find someone who has tuning software, this is free. It only costs money to change/upload a tune in most cases. This will tell you if the tune has been altered and how.
2) Start saving money now. It's likely that the trans has seen some miles (maybe not as many easy ones as you may have thought) and the clutch packs and/or bands are worn. If the tune comes back looking stock or within reason, you're going to need the money you've been saving.
3) Start looking for trans shops in your area. If you drive this car as hard as it sounds like you do, then you're going to want to make friends with them now.
4) If by chance it is all in the tune, convince the person with the software from step 1 to retune your trans settings for $150~200. It's super easy to tune a trans - especially on a car that hasn't been heavily modified. Most of the stock tables work great.
What I would do...
1) Read the tune. If you find someone who has tuning software, this is free. It only costs money to change/upload a tune in most cases. This will tell you if the tune has been altered and how.
2) Start saving money now. It's likely that the trans has seen some miles (maybe not as many easy ones as you may have thought) and the clutch packs and/or bands are worn. If the tune comes back looking stock or within reason, you're going to need the money you've been saving.
3) Start looking for trans shops in your area. If you drive this car as hard as it sounds like you do, then you're going to want to make friends with them now.
4) If by chance it is all in the tune, convince the person with the software from step 1 to retune your trans settings for $150~200. It's super easy to tune a trans - especially on a car that hasn't been heavily modified. Most of the stock tables work great.
But haven't you heard SS? If something is not right these days it HAS TO BE THE TUNE!
03-26-2011, 07:04 PM
#17
Teching In
Thread Starter
Join Date: Mar 2011
Posts: 10
Likes: 0
Received 0 Likes
on
0 Posts
gettin trans fixed nxt week. gettin it beefed up and shift kit and whatever esle he wants to do. probly gonna be around 1600-1800 so it sucks but hey alteast now all i need is heads/cam and intake and ill be sittin pretty lol
