What torque converter

[the idiocracy]

I need some help selecting a torque converter. I am currently running an turbocharged Inline 6 with a Fitech EFI setup. I am changing from a Th350 to a 700R4. Not a racecar, just a hotrod cruiser that will do the occasional burnout. Turbo is set to 10.5 psi and has a bit of lag...nothing to dramatic. occational

I was thinking of something in the 2200-2500 range for a stall, but I also want it to lock up at highway speed (3.73 rear and a 28" tire...cruising rpm will likely be right around that 2500 area).

Is 2500 stall too high?

[Rickysnickers]

If you have your cam specs, then I would get those and check with a few different convertor companies to see what they recommend. I have a 700r4 and am using an FTI convertor. It has lockup and seems to work well.

[RustyPile]

Originally Posted by the idiocracy

I need some help selecting a torque converter. I am currently running an turbocharged Inline 6 with a Fitech EFI setup. I am changing from a Th350 to a 700R4. Not a racecar, just a hotrod cruiser that will do the occasional burnout. Turbo is set to 10.5 psi and has a bit of lag...nothing to dramatic. occational

I was thinking of something in the 2200-2500 range for a stall, but I also want it to lock up at highway speed (3.73 rear and a 28" tire...cruising rpm will likely be right around that 2500 area).

Is 2500 stall too high?

Forced induction, camshafts, rear gear ratios, and torque converters have to be coordinated or they won't play well together.. A cam with too much overlap will allow the boost to simply "blow through", causing a loss of boost. Conservative duration coupled with high lift is the key.. A long duration cam (normal aspiration) requires a "loose" torque converter so the higher idle speed doesn't try to pull the vehicle during stops.. Plus the "looser" (is that a word??) torque converter allows the engine to get into the camshafts power band, same way a lower gear allows the engine to rev higher..

Under normal circumstances, simply adding forced induction doesn't require a Torque converter change.. As was stated previously, check with the camshaft manufacturer for torque converter recommendations..

[HO455]

Congratulations on your combination. It sounds cool!
I recommend giving Continental Torque Convertors a call. They are a smaller company that is happy to build one off units for special applications. As opposed to the big companies that select the closest thing they build out of the catalog and send it.

[the idiocracy]

Heres the cam specs (attached). It runs surprisingly hard for a chinese turbo thats probably too big, hence the bit of lag. But its a fun truck to drive. That said, I'm not looking for ET or a perfectly match combo. Really looking for something thats going to have a slightly higher than stock stall speed and have good driving characteristics.

[Getter-Done]

In the past I run Art Carr transmission parts.
He owns a business in Huntington Beach, CA now.
As he states on his web page

Don't be Fooled!
WE ARE NOT CONNECTED or AFFILIATED with
ART CARR PERFORMANCE of TEXAS,
or
ACT TRANSMISSION of NORTHRIDGE, CA

These parts were very good quality. And never had any trouble with the trans after the rebuild.

Here's link. there is also info about TV cable for the 700.

Link:http://cpttransmission.com/techinfo.htm











.

[LS short box]

I've used Yank and Circle billet converters in the 3000-3200 stall range on a few projects and they drove like stock until you leaned on it. Buy a good converter. FTI has good rep on LS1tech. Yank and Circle kind of start in $450 -500 range. Make sure you run a good trans cooler. A stall converter will create a bit more heat. Call them and see what they recommend.