700r4 standard shift points @ WOT??
Thread Starter
Burning Brakes
Joined: Aug 2006
Posts: 878
Likes: 2
From: BC
700r4 standard shift points @ WOT??
Ever since doing an LT1 intake conversion my 700r4 trans seems to be shifting earlier at WOT. I just want to know what can make this difference?
On the TPI it would shift between 52-5400 rpm, I'm only seeing 4700 rpm now I've converted. Seeing as the conversion was to let the engine rev further i'm annoyed that my trans is changing sooner!
I have adjusted the TV cable so that at WOT at the butterfly the TV cable is fully tight. If I wasn't reaching full WOT at the pedal side would this cause the earlier change?
I know that I need to shorten the throttle cable slightly since the intake swap.
Please help!!
Dan
On the TPI it would shift between 52-5400 rpm, I'm only seeing 4700 rpm now I've converted. Seeing as the conversion was to let the engine rev further i'm annoyed that my trans is changing sooner!
I have adjusted the TV cable so that at WOT at the butterfly the TV cable is fully tight. If I wasn't reaching full WOT at the pedal side would this cause the earlier change?
I know that I need to shorten the throttle cable slightly since the intake swap.
Please help!!
Dan
Drifting
Joined: Oct 2006
Posts: 1,934
Likes: 3
From: Citrus Heights California
Are you sure your TPI was shifting that late? I always thought a stock TPI quit making power at 4800 RPM. I'm not sure why it's shifting later. A Trango shift kit might help or a heavier governor. I believe you should dyno it first and find out when your Hp and torque peak. That will help you determine a good shift point.
Last edited by Kool88vette; Mar 10, 2008 at 10:23 AM.
Race Director
Joined: Sep 2000
Posts: 17,298
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From: The Top of Utah
Did you change TBs? If not, is the outer TV cable mounting point at the TB end, in the same place? Your previous shift point of 52-5400 rpm was awfully high for a stock TPI. Had you changed something to delay the shift point? On my car, adjusting the TV cable had little effect on the shift points, however, it is not proper to try to use the TV cable adjustment to alter the shift points. TV cable geometry and adjustment are quite critical. A screw up here can cost you a transmission. I would very carefully check to be sure the TV cable is operating correctly.
RACE ON!!!
RACE ON!!!
Drifting
Joined: Oct 2006
Posts: 1,934
Likes: 3
From: Citrus Heights California
Did you change TBs? If not, is the outer TV cable mounting point at the TB end, in the same place? Your previous shift point of 52-5400 rpm was awfully high for a stock TPI. Had you changed something to delay the shift point? On my car, adjusting the TV cable had little effect on the shift points, however, it is not proper to try to use the TV cable adjustment to alter the shift points. TV cable geometry and adjustment are quite critical. A screw up here can cost you a transmission. I would very carefully check to be sure the TV cable is operating correctly.
RACE ON!!!
RACE ON!!!
You can screw up your transmission in a few miles if the TV cable adjustment is not right.
Thread Starter
Burning Brakes
Joined: Aug 2006
Posts: 878
Likes: 2
From: BC
I have changed the Distributor and Coil etc to a different design (Camaro) I do seem to be getting a cleaner Tach reading now, maybe its just a case of the Tach was over-reading previously?
The engine used to stop making power quite a bit before it changed gear when it was on the TPI.
The engine used to stop making power quite a bit before it changed gear when it was on the TPI.
Thread Starter
Burning Brakes
Joined: Aug 2006
Posts: 878
Likes: 2
From: BC
the TV cable is adjusted so its at full stretch when at WOT, I assume thats the only way to do it. I cant adjust it in the recommended way as its mounted further on the side than standard and theres more angle. It pulls itself tight on the ratchet mech... it wont pull itself through.
Race Director
Joined: Sep 2000
Posts: 17,298
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From: The Top of Utah
Originally Posted by dan_t
the TV cable is adjusted so its at full stretch when at WOT, I assume thats the only way to do it. I cant adjust it in the recommended way as its mounted further on the side than standard and theres more angle. It pulls itself tight on the ratchet mech... it wont pull itself through.
RACE ON!!!
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Thread Starter
Burning Brakes
Joined: Aug 2006
Posts: 878
Likes: 2
From: BC
what is the fix then? I'm not the first to have done an intake swap.
here is the best picture I have at the moment.
I have PM'ed Pete K so I hope he may be able to help!
here is the best picture I have at the moment.
I have PM'ed Pete K so I hope he may be able to help!
Last edited by dan_t; Mar 10, 2008 at 12:03 PM.
Race Director
Joined: Sep 2000
Posts: 17,298
Likes: 33
From: The Top of Utah
Originally Posted by dan_t
what is the fix then? I'm not the first to have done an intake swap.
RACE ON!!!
Drifting
Joined: Oct 2006
Posts: 1,328
Likes: 14
From: Stafford Connecticut
A constant pressure valve body made by TCI is one answer to your problem .Summit sells them. With one of these you can adjust your cable anyway you want and not ruin your trans.The unit keeps a minimum 200 psi on your trans no matter how the cable is adjusted.
Drifting
Joined: Oct 2006
Posts: 1,934
Likes: 3
From: Citrus Heights California
The only difference I can see is your TB and TV bracket. It looks like it's moved forward. Or maybe it looks that way because your accordian looks squashed. The cable can be adjusted. I think my SR moved the TB and the TV bracket forward about an inch. I opened your photo into my pictures for a close up. You can do the same with my photo. I think you repositioned the bracket where the TV cable adjustment is about 2" foward of stock. I would not attempt to drive it that way. Have a Tranny expert set your TV cable or get one of those constant pressure valves from summitracing.com.
Last edited by Kool88vette; Mar 10, 2008 at 07:00 PM.
