Torque Converter Toast
Thread Starter
Burning Brakes
Joined: May 2014
Posts: 884
Likes: 128
From: Rhine Georgia
Torque Converter Toast
700r4 trans....Old converter was a middle of the road model lockup 3000 stall. It was a Summit brand so I have no idea who made it for Summit. Lasted 2 years of just playing around no track or racing. It did fine but would never lock up like it should. I just lived with it. Never ran hot so I let it go. Converter started leaking last week.
Engine dyno 470 TQ. I went with another 3000 stall but switched to FTI Performance SRL Series converter.
https://www.summitracing.com/parts/FTI-SRLT3082
Hoping this will be a step up from the old brand X converter.
Question is....Will I notice any performance or driving difference with a better converter? I'm not a track guy but I do enjoy spirited driving from time to time.
Engine dyno 470 TQ. I went with another 3000 stall but switched to FTI Performance SRL Series converter.
https://www.summitracing.com/parts/FTI-SRLT3082
Hoping this will be a step up from the old brand X converter.
Question is....Will I notice any performance or driving difference with a better converter? I'm not a track guy but I do enjoy spirited driving from time to time.
Le Mans Master
Joined: May 2006
Posts: 9,993
Likes: 1,136
From: League City Tx
The FTI converter will be better in every way.
Probably drive closer to stock around town, will flash higher when you nail it on sticky tires, and will likely be more efficient on the big end...
Just make sure your lock up control device is working correctly...(vacuum switch or whatever you are using)
Probably drive closer to stock around town, will flash higher when you nail it on sticky tires, and will likely be more efficient on the big end...
Just make sure your lock up control device is working correctly...(vacuum switch or whatever you are using)
Le Mans Master
Joined: May 2006
Posts: 9,993
Likes: 1,136
From: League City Tx
I had great luck with the FTI converter in my C5Z. I did send it back in to be restalled twice because it was a little too loose up top at my power level (900 ish) at the time. They always had fast service and dialed the converter in well the last time.
Pretty much all of the fast guys are using FTI....
They usually give you one free restall also incase you don't like it behind your combo.
Safety Car
Joined: Jan 2009
Posts: 4,000
Likes: 299
From: New York
What do you mean the "Converter" started to leak
Did it have a hole in it ? A bad weld ?
Or do you mean the front of the transmission leaked ?
In which case its a front pump Bushing issue. DO NOT install a new converter with out addressing that pump seal and bushing
And a 700R4 needs the lock up feature to cool the transmission properly . If you did not have lock up it . Your issue may be in the valve body NOT the converter.
Did it have a hole in it ? A bad weld ?
Or do you mean the front of the transmission leaked ?
In which case its a front pump Bushing issue. DO NOT install a new converter with out addressing that pump seal and bushing
And a 700R4 needs the lock up feature to cool the transmission properly . If you did not have lock up it . Your issue may be in the valve body NOT the converter.
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,116
From: Crossville TN
What kind of controller are you using to manage the lockup shifts on/off?
The TCC can throw craps if it sees too much torque going through it. That unit is only meant be function at normal flat/shallow rise conditions. It should drop out of lockup when going up hills or under load. If it is just being managed with an ON/OFF switch, it can risk damage to the TCC.
The TCC can throw craps if it sees too much torque going through it. That unit is only meant be function at normal flat/shallow rise conditions. It should drop out of lockup when going up hills or under load. If it is just being managed with an ON/OFF switch, it can risk damage to the TCC.
Thread Starter
Burning Brakes
Joined: May 2014
Posts: 884
Likes: 128
From: Rhine Georgia
I'm not sure how its setup. I know there is no extra switch like some people use. Its supposed to lockup automatically and unlock on breaking. The installer tried 2 different switches and it never locked after I first noticed it. (I didnt notice it not locking for a couple of days). We did verified that that the converter was a lockup model. I'm hoping this new converter will lockup on install. If not I'll have to dig deeper.
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Le Mans Master
Joined: Dec 2006
Posts: 8,837
Likes: 1,028
I'm not sure how its setup. I know there is no extra switch like some people use. Its supposed to lockup automatically and unlock on breaking. The installer tried 2 different switches and it never locked after I first noticed it. (I didnt notice it not locking for a couple of days). We did verified that that the converter was a lockup model. I'm hoping this new converter will lockup on install. If not I'll have to dig deeper.
Thread Starter
Burning Brakes
Joined: May 2014
Posts: 884
Likes: 128
From: Rhine Georgia
Le Mans Master
Joined: Dec 2006
Posts: 8,837
Likes: 1,028
Team Owner
Joined: Jan 2006
Posts: 37,637
Likes: 3,116
From: Crossville TN
I believe that is a lockup valve repair kit. The early 700-R4 lockup valves were prone to sticking; that one won't stick.
But, it has nothing to do with controlling the lockup shifts (on/off).
But, it has nothing to do with controlling the lockup shifts (on/off).
Thread Starter
Burning Brakes
Joined: May 2014
Posts: 884
Likes: 128
From: Rhine Georgia
Update:
Very happy on trip home. Rides like a different car. Lockup works correctly. Car responds better and does not lug like before at lower speeds. Much more fun.
I did switch to the sonnax super hold servos while trans was out. All shifts are crisp. 3-4 was soft before.
Changes were: new fluid, FTI billet converter (same stall speed as old Summit converter 3000) and the sonnax super hold servos.
Very happy on trip home. Rides like a different car. Lockup works correctly. Car responds better and does not lug like before at lower speeds. Much more fun.
I did switch to the sonnax super hold servos while trans was out. All shifts are crisp. 3-4 was soft before.
Changes were: new fluid, FTI billet converter (same stall speed as old Summit converter 3000) and the sonnax super hold servos.