Lil IHRA classification help please!! Newbie Alert!

[Frank B.]

93 's came with a 4l60 not 4l60e. 94's and 95's came with 4l60e with OBD1 computer. 96 to 98 came with OBD2 computers. Cars with the OBD1 computer have shifting problems with a high stall convertor.

[Dan Fahey]

Originally Posted by Frank B.

93 's came with a 4l60 not 4l60e. 94's and 95's came with 4l60e with OBD1 computer. 96 to 98 came with OBD2 computers. Cars with the OBD1 computer have shifting problems with a high stall convertor.

That is correct for the 1-2 shift. However there is a 1-2 Fix for the OBD1 PCM's.
You could run up to a 3000 stall converter without it.
More than that the sensor on the rear of the trans shifted preventing the 1-2 shift under load.

Ed Wright or Bryan Herter (PCMforless)can send you a BIN file for the 1-2 Fix.
TunerCat and LT1 edit are two software available for loading and tuning files.

d

[KennyAnderson]

Originally Posted by Frank B.

93 's came with a 4l60 not 4l60e. 94's and 95's came with 4l60e with OBD1 computer. 96 to 98 came with OBD2 computers. Cars with the OBD1 computer have shifting problems with a high stall convertor.

Ok, thanks, I'm learning! What controls the shifts in a 4L60? What type of computer is in my 93?

[Frank B.]

The 1993 4l60's shifts are controlled by a govenor with springs and weights. The 93 computer is an EPROM chip type computer that can be reprogrammed by Ed Wright,Bryan Herter,etc.

[KennyAnderson]

Originally Posted by Frank B.

The 1993 4l60's shifts are controlled by a govenor with springs and weights. The 93 computer is an EPROM chip type computer that can be reprogrammed by Ed Wright,Bryan Herter,etc.

Excellent! At least I can adjust the shiftpoints myself. I would definitely have preferred the OBD2 but had no idea and this car was too good to pass on. When a guy like me who hasn't raced off the bottom for YEARS can jump in a car and go to the Div Finals and go rounds, not bad!

PS Thanks again Dan!

[Dan Fahey]

Originally Posted by KennyAnderson

Ok, thanks, I'm learning! What controls the shifts in a 4L60? What type of computer is in my 93?

Contact
Ed Wright on Class Racer...
or
Bryan Herter at bryan@pcmforless.com

They are excellent and experienced tuners.
Bryan sent a Bin Files for my car and it ran great.
When he brought the Dyno Truck to Pocono had it Dynoed.
Made tiny change which only yielded a hundredth better ET.

Dan

[Dan Fahey]

Anyone who wants to get a Car Classified.

Mike Baker from IHRA can send you an IHRA Technical Information Form.
He just sent me a copy.

May create a Database with one of my IT guys to help move the process along.

They have a few already in the pot being worked over.
They are earnestly busy for another month or so to finish the season.

Dan