I had to prove Dave W and everyone else wrong on this and it can be done! That said I would NEVER try it again, what a PIA! Would have been easier to swap to a 1227747 then run a 16197427 without VSS...Originally Posted by dave w
I had to prove Dave W and everyone else wrong on this and it can be done! That said I would NEVER try it again, what a PIA! Would have been easier to swap to a 1227747 then run a 16197427 without VSS...
1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
-= =-
Then you noticed the same difference I did. Everything just seemed to work better when mated to the 4L60E.
The man who says something is impossible, is usually interrupted by the man doing it.
well i do i have a couple 7747s and a 4288 laying around
They would be tricky to get running in an MPFI application.
The man who says something is impossible, is usually interrupted by the man doing it.
The driveability was from the E-Trans and being able to dial in the shift points better. The 4L60E even gave better driveability than the 700r4 it replaced with a Holley 4bbl carb.
With no engine modifications or tuning done you can completely change the feel of how a vehicle drives with changing shift points in 4L60E. Good stuff!
1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
-= =-
My 5.7 Express van was one of the prime examples of how NOT to tune a 4L60E shift. The shifts were way too early and the converter clutch locked way too early and stayed locked too long.With no engine modifications or tuning done you can completely change the feel of how a vehicle drives with changing shift points in 4L60E. Good stuff!
Exactly! My 1998 Silverado with 3:73 gears and a towing package is the exact opposite!
Another prime example is a B body LT1. It's just a big slllluuuusssshhhhh, never feel a gear cahnge or TCC lockup. Flash in a Caddy V4P tow package bin, even stock and it feels more like a sport car or truck, few tweaks and wow!
1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
-= =-
Ok i found a 1227727 pcm started swapping out the bad 6870 ecm today and wondered about injector wiring the 7727 pinouts have injector grounds and i guess i have to bypass esc module then wire in a map sensor via the existing maf wires
i got the ecm out of a 3.1 v6 grand prix so i have to modify the memcal
Last edited by Aholt91ss; 06-23-2013 at 05:34 AM.
ok update i have conneted the 7427 pcm to the camaro and did the tbi to mpfi.zip it wont idle i have to keep foot on pedal any ideas
if im not wrong, the optical speed sensor(yellow buffer box on the back of the camaro speedo) already puts out 2000 ppm................
yeah i figured that out didnt at first but looked at pinouts and found vss pin in connector
UPDATE: found mpfi bin tried it runs decent and idles just needs some tweeking bypass esc module first time this thing has run in 10 years
i am using a od pfi maf bin even though it has map sensor installed will this cause problems?
Last edited by Aholt91ss; 07-08-2013 at 06:40 AM.
im think there is hot restart issues it will ran last night but ive trying all day to get it to run and it wont at all
im thinking about buying me a megasquirt bypass the headache
Yes! There are a bunch of ZIp folders in this link, need to find the non MAF ones and read them. There are many changes needed to a stock TBI bin to make it run MPFI, then tuning.
Just a lot more money for a different headache!
It could be anything at this point? Have you checked to see what codes are set? Do a data log and post it up so we can see what's happening and can help... What bin did you start with? You can post it as well.
1990 Chevy Suburban 5.7L Auto ECM 1227747 $42!
1998 Chevy Silverado 5.7L Vortec 0411 Swap to RoadRunner!
-= =-
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