urgent: tc over 3400 is bad!! PCM??
#1
urgent: tc over 3400 is bad!! PCM??
in Camaro performances magazine
ive read the following:
"For automatice-equipped cars, a higher stall torque converter is a good way to chop a couple of tenths off your e.t. The 3,300 stall range is what you want on a mostly stock car. if you go above 3,400, however, you'll need to have the computer recalibrated. Otherwise, the PCM will think the trans is slipping."
well before 2 days ive ordered tci 3500.. if what the magazine says is true then i will cancel the order and order tci 3,200
what do u think guys.. i dont beleive magazines but could this be true???
ive read the following:
"For automatice-equipped cars, a higher stall torque converter is a good way to chop a couple of tenths off your e.t. The 3,300 stall range is what you want on a mostly stock car. if you go above 3,400, however, you'll need to have the computer recalibrated. Otherwise, the PCM will think the trans is slipping."
well before 2 days ive ordered tci 3500.. if what the magazine says is true then i will cancel the order and order tci 3,200
what do u think guys.. i dont beleive magazines but could this be true???
#2
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I think you will be fine with a 3500 stall. I have heard of some cars throwing a code for excessive TC slippage but that was with 4400+ stalls.
FWIW I have run 2800-5000 stalls in my 98 Z28 and have never had a TC slip code.
John
FWIW I have run 2800-5000 stalls in my 98 Z28 and have never had a TC slip code.
John
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You'll be fine, but computer tuning would easily take care of any SES lights. If you ride the converter at low throttle input, sometimes the computer will set a P1870 code for excessive slippage. I've seen small converters set the light before under the right conditions, so I'm not sure why they picked a 3400 rpm cutoff point...And remember, its a magazine, not gospel.
#4
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Originally Posted by Caprice2002
in Camaro performances magazine
ive read the following:
"For automatice-equipped cars, a higher stall torque converter is a good way to chop a couple of tenths off your e.t. The 3,300 stall range is what you want on a mostly stock car. if you go above 3,400, however, you'll need to have the computer recalibrated. Otherwise, the PCM will think the trans is slipping."
well before 2 days ive ordered tci 3500.. if what the magazine says is true then i will cancel the order and order tci 3,200
what do u think guys.. i dont beleive magazines but could this be true???
ive read the following:
"For automatice-equipped cars, a higher stall torque converter is a good way to chop a couple of tenths off your e.t. The 3,300 stall range is what you want on a mostly stock car. if you go above 3,400, however, you'll need to have the computer recalibrated. Otherwise, the PCM will think the trans is slipping."
well before 2 days ive ordered tci 3500.. if what the magazine says is true then i will cancel the order and order tci 3,200
what do u think guys.. i dont beleive magazines but could this be true???
#6
yes but it looks simular to my sig but its LTZ instead of SS .. my car is classified as family cars but it still go fast.. i dont know alot about pcm so i dont want to bother my self .. if 3500 might needs re programing then i wont put it .. cuase ppl in my country dont know alot about TC guess re programing would be hard or expensive.. those i cant deal with
#7
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Originally Posted by Caprice2002
yes but it looks simular to my sig but its LTZ instead of SS .. my car is classified as family cars but it still go fast.. i dont know alot about pcm so i dont want to bother my self .. if 3500 might needs re programing then i wont put it .. cuase ppl in my country dont know alot about TC guess re programing would be hard or expensive.. those i cant deal with
1. "Idle hunt", vehicle could not keep idle even a stop light. Taking foot off the gas on freeway @ 60 MPH, RPM's would drop to 600, give it gas, the RPM's would goose up to 2500, then engage the transmission.
2. "shifting between 3rd and OD at freeway speeds", could not find what gear it wanted to stay in. TC would lock and unlock at will, and one time I drove home @ 65 MPH with the converter unlocked, with RPM's @ 4000.
I knew these things were a possibility from research, and reading other posts, so I had the car dyno tuned and all the problems were solved.
This is what the tuner told me:
A stall @ 3,000 or above does not work with the stock shift points, the PCM can not figure out where to properly shift the vehicle anymore. The Torque Management has to be deleted (01 & 02 models) or timing is pulled @ higher RPM's at the shift point when the PCM reads increased line pressure from the new TC. My idle RPM was also raised in the PCM.
On my vehicle I also added a B&M 24K trans cooler, a 3 Qt. aluminum deeper pan, Transgo shift kit, and TCI SF-29 flexplate, with ARP bolts.
Get your ducks all in a row before the TC install, I suggest you find a tuner that is familiar with your type of vehicle, and make an appointment right after the TC install. If you are luckey enough that your car drives properly, you can always cancel the tune.
For the week I had to drive my vehicle after the TC change, before the dyno tune, it was pure misery.
My friend installed a 2600 stall with a 1.6 STR (not worth the time or trouble), in his 02 Z28, and did not experience any problems, he did not need any PCM adjusting.
Good luck
SteveC
Last edited by SteveC; 06-23-2004 at 05:14 PM.
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Caprice2002 did you order the biggest tranny cooler you could fit also?? You are in Kuaite(sp haha) right?? There a few guys here from there also you should see if any of them are near you to help with programming.
#9
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The vettes had some issues with 3500+ stalls. Most camaros do not.
I've been around dozens of camaros with 3500 - 4400 stalls w/o programming. The issues described by Steve C, I commonly see with gear swaps and very rarely with converter swaps, except for the idle issue which is easily solved w/o programming. That said, a good 3000 - 3300 stall will net most of the gains seen by a 3500 stall so I wouldn't hesitate to use a Vig 2800, Yank 3000 or TCI 3300.
I've been around dozens of camaros with 3500 - 4400 stalls w/o programming. The issues described by Steve C, I commonly see with gear swaps and very rarely with converter swaps, except for the idle issue which is easily solved w/o programming. That said, a good 3000 - 3300 stall will net most of the gains seen by a 3500 stall so I wouldn't hesitate to use a Vig 2800, Yank 3000 or TCI 3300.
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man, i keep reading pros and cons of installing a TQ, I was thinking about getting in on the tci tq GP from thunder racing but now i am starting to think twice about it.I have a predator custom tune in the car right now with torque management already deleted, but the car recently has become a daily driver for both myself and my wife. this is the one mod i really want to do but also the biggest one that has me worried.
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I had to have mine tuned with my 3200. The stock computer had a torque management that would almost make the car shut off. felt like it was going no where with a loud *** noise.
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Ragtop 99:
I installed a custom tune i received from Diablosport, with TM deleted, could those parameters be changed with the predator? If so what is recomended with a tci ssf 3500? thanks.
I installed a custom tune i received from Diablosport, with TM deleted, could those parameters be changed with the predator? If so what is recomended with a tci ssf 3500? thanks.