Lil IHRA classification help please!! Newbie Alert!

[KennyAnderson]

Originally Posted by Frank B.

If you have a 93 car it is not shifted by computer. Also your PCM is chip tuned not flash tuned. Just mt 2 cents

Frank its got a 4L60E tranny. I a total newbie to this deal but I believe the computer controls this one. In 93 they also built some with 700R4's which use a governor. I got the computer dal. After I make my changes I plan on taking it to a local computer car guru to burn a chip for me.

[KennyAnderson]

Originally Posted by bigshow2966

Do the older cars have an Intake Air Temp sensor? I know on my GTO it would pull timing when temps went up. Only problem was it was so close to the radiator it was reading water temps in the stock location. It would slow down a ton.

I dunno. Maybe. Did you just unplug it? I just raced it in Jackson SC and although I wasn't the only one, it was tough predicting et as we had big weather changes every day.

[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.

[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

[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!