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Old 06-13-2004, 04:47 PM
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t400 to 700r

I have a tpi 350 with edelbrock rpm heads ,rpm cam,edelbrock runners in a 88 nissan pickup with t400 & ford 3.55 gears.Need
better gas mileage.It is around 10 now.I will change to a comp
12-249-4 cam.This cam has 206-218 with 212 overlap.The tranmission shop here in mexico said he could change a 700r to a non lockup .Is this possible and can i use the t400 converter? Will this cause overheating in od?How much will my mileage change.Sorry for all the stupid questions.I have gotten a lot of info from here. Thank you for any help. This is my first post.
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Old 06-13-2004, 05:52 PM
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Obviously with TPI you have a computer to run it, is everything hooked up that allows the computer to read all parameters correctly?

You should NEVER get 10 mpg with a TPI on a 350 unless something is seriously malfunctioning or you have it installed in something like a bulldozer.

things like changing the cam as you mentioned, will definitely mess with the signals the computer must be able to comprehend.

Without having a new chip set to new parameters and all changes taken into consideration (new cam), your engine will not run correctly.

"said he could change a 700r to a non lockup .Is this possible" YES

"and can i use the t400 converter?" NO

I don't understand why you would NOT want the lock-up torque convertor, when you are asking for more mileage.
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Old 06-13-2004, 06:13 PM
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Sorry I did not give all the info on my truck.
It has an Accel ECM with Calmap program.The engine has a non computer distributor.The fuel map was programed by me.The best iI know how from an example found on the net. If you could direct me to someone who could help ?Love the old t400, never any problems with it.
Thanks again.
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Old 06-13-2004, 06:19 PM
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I would have to say your ecm is looking at a LOT of things it cannot recognize.

The only thing that comes to mind about programming it more precisely to the added performance parts you have installed is to see what the guys over at www.thirdgen.org have to say, many of their cars were factory TPI.
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Old 06-13-2004, 10:57 PM
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Thanks for the info.
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Old 06-14-2004, 04:03 PM
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Why did you go with a non-computer distributor? The components of the TPI all act together to give you the right timing and mixture for THAT moment. Removing any one of these components can seriously mess with how it will function. We have a Vette we run thats pretty heavily modified and it still averages 16mpg and the driver is in no way light on the gas lol.
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Old 06-14-2004, 06:46 PM
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Short on money at the time and i had the distributor when a
750 carb was on the truck.what transmission are you running .also what gear.have ordered a distributor,but will go to the states to pick up .
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