obd2 swap
Joined: Nov 2001
Posts: 10,023
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From: LT1 land...the "409" of the 90s!
No no 
The reason i was asking how fast is most have the problem around 17 and faster 60 FT times. an if they are running a TH400 they probably had the problem
I have cars in the 9s and 10s on my 4L60Es and Ed Write one of the oldest and best around. He posts here. If you search his name you should come up with some thing.
What happens is there is a table that sets the "No VSS" code if stall is higher then "X" and there is no VSS signal
Ed was telling me Yank and Edge converters seem to have the biggest issues although I have seen it bad with Fuddle converters and also on TCI and PI converters.
I run a transmission shop durring the day and Speed Secrets at night so I see alot of them
The reason i was asking how fast is most have the problem around 17 and faster 60 FT times. an if they are running a TH400 they probably had the problem I have cars in the 9s and 10s on my 4L60Es and Ed Write one of the oldest and best around. He posts here. If you search his name you should come up with some thing.
What happens is there is a table that sets the "No VSS" code if stall is higher then "X" and there is no VSS signal
Ed was telling me Yank and Edge converters seem to have the biggest issues although I have seen it bad with Fuddle converters and also on TCI and PI converters.
I run a transmission shop durring the day and Speed Secrets at night so I see alot of them
Gotcha ... nope I am nothing more then a stock lt1 with crap exhaust and a 3200 stall! Best 60' so far was a 1.92 on my first pass and only pass with the new tranny and stall. This was on 40psi street tires ... so I would say a 1.7 or better would be pretty easy with a good stick tire! Not to much spin of the hole ... felt better, hot night ... so I was happy I guess. Sticky tire, and bolt ons will really help me out!
As far as that table goes the only VSS related thing I found was "Vss Diag. Enable Min RPM" which mine is at 3,000 ... this was found in the ECM constants. I do most of my own tuning, so thats why I was wondering! There has to be a way to tune around this!
As far as that table goes the only VSS related thing I found was "Vss Diag. Enable Min RPM" which mine is at 3,000 ... this was found in the ECM constants. I do most of my own tuning, so thats why I was wondering! There has to be a way to tune around this!
so its still ed wright the only one with a fix? well gimme his number and what does his tune cost?
the only thing i hear bad is that he tunes it and when he does you cannot ever ahve any1 else tune it again. which aint a bad problem but i hear sometimes he can be hard to get ahold of?
the only thing i hear bad is that he tunes it and when he does you cannot ever ahve any1 else tune it again. which aint a bad problem but i hear sometimes he can be hard to get ahold of?
Yah, the magic stall point seems to be ~3300 +/-. Around there is where these problems start. And it's ONLY with 4L60E's, since they're PCM controlled. Any other trans does not count.
This (and the fact that it annoyed the heck out of me with its looseness) is why I sent my converter back to Yank and had them restall it DOWN to "as tight as you can get it". I shipped a ST3500, it came back as a SY3000. So far it does seem tighter, but I haven't driven the car more than backing it in/out of my shop. Need to do a bunch of work before I can take it to the streets.
Ken @ Carputing sent me an attempted fix a long time ago, but it didn't work. I have Datamaster logs showing me going from 3mph to 140 mph in 1 frame of data. The PCM don't like that.
At this point, I don't want to go back to an OBDII PCM either, so if this Yank starts acting up on me, I'll sell it and go back to a full size 2400 converter (hey Ellis, is Pac Trans still around? ). I sure hope it works though, I'm about $1000 in to it at this point (original purchase plus rebuild).
Oh, and Ed's web site is fastchip dot com
This (and the fact that it annoyed the heck out of me with its looseness) is why I sent my converter back to Yank and had them restall it DOWN to "as tight as you can get it". I shipped a ST3500, it came back as a SY3000. So far it does seem tighter, but I haven't driven the car more than backing it in/out of my shop. Need to do a bunch of work before I can take it to the streets.
Ken @ Carputing sent me an attempted fix a long time ago, but it didn't work. I have Datamaster logs showing me going from 3mph to 140 mph in 1 frame of data. The PCM don't like that.
At this point, I don't want to go back to an OBDII PCM either, so if this Yank starts acting up on me, I'll sell it and go back to a full size 2400 converter (hey Ellis, is Pac Trans still around?
). I sure hope it works though, I'm about $1000 in to it at this point (original purchase plus rebuild).Oh, and Ed's web site is fastchip dot com
Last edited by Camaroholic; Aug 12, 2006 at 11:06 AM.
no ion cant...i use him now and we tried a few differant things lowering shift points reducing shift firmness but nothing worked...pcm4less said they would gaurantee me a fix(for 175 plus shipping) and ed i hear definately has a fix...
i cant believe that you have to go through this trouble...from what i understand its s simple loss of a signal from the tranny on hard launching that does this...so why cant you replace a sensor? or rewire somethin to eliminate it?
i cant believe that you have to go through this trouble...from what i understand its s simple loss of a signal from the tranny on hard launching that does this...so why cant you replace a sensor? or rewire somethin to eliminate it?
TECH Addict
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From: The beautiful Kingdom of Bahrain
There are people that know the fix but it's like this big freegin secret started by Masons or something. If you search really hard on camaross.com youll find enough info to piece it together. You may even find Jimmy Hoffa.
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Verdad Gallardo yea but i dont have tuning capabilities...and i dont mind paying some1 but it cant be that hard to just tune this issue, granted its a secret and not many know how...but they dont have to mess with no fuel no timing no nothing, shouldent take a professional more than 20 30 minutes...that plus im getting broke over this problem and im hoping some1 will offer me better than 175 for 30 minutes of work...hioefully in the 50 range at most... 
id really like some1 to say i feel your pain lemme help ya out....
id really like some1 to say i feel your pain lemme help ya out....
If it is a vss issue as stated earlier, you can program out the vss completely from the pcm. i will need to go to the track and datalog and tune ... i will see what i come up with! this makes no sense to me because a lot of odb2 cars swap back to obd1 due to larger cam shafts causing more issues and throwing codes ... you can tune around almost anything in these cars, this would probably be another one, just not many know about it because it really isnt a known issue, and only a handful have fixed it.
i think mad z28 tuned out my vss...he told me he changed it to shift by rpm only and i still have this problem...if anyone can help me tune this i really wanna get his fixed its annoying because i wanna put a bottle on my car but all my plans are haulted due to this...and im actually kinda broke...ed just sent me a mesage and said he would tune it for 350...or i can drive 4 hrs to okla(not that bad) and hell dyno tune it for 550
that a great deal but i dont have 350 more or 550 to fix this....
and i dont think a dyno tune on my 306 is worth it, ill wait till i have a custom cam..
that a great deal but i dont have 350 more or 550 to fix this....
and i dont think a dyno tune on my 306 is worth it, ill wait till i have a custom cam..
dyno tunes are never really worth it imo ... going to the track and tuning is where it really is at. dyno's are good for a/f readings thats about it imo ... especially for a stalled lt1. i would love to help you out, but you not having the ability to get a datalog done or a copy of your current tune to look at i would love to see it. especially how they got it to shift by rpm ... because the shift tables are by mph vs tps. thats why going to the track and data logging when the car shifts through the pcm is much more valuable then a dyno tune, you can find out what rpm it shifted at, at what mph, and make fine adjustments ... 4-5 passes and you could have it dialed in. as far as the vss i found something last night in the pcm that i bet it could be tuned out ... problem is i dont have this problem on my car, and you already did the odb2 swap :\
thats the problem i havent done the obd2 swap..i cant get the thing to work, i ahve the obd1 computer in my car right now to be able to drive it...i wish i could datalog somehow...what are yall guys using i think im goana hve to start looking into this tuning urself and datalogging all the goodies
what kind of problem are you having>
cause on mine i keep over revving 2-3 shifts and my tuner and i tried soo many things to try and fix it but wont work. This keeps burning out my 2-3 clutches.
3200 stall here.
cause on mine i keep over revving 2-3 shifts and my tuner and i tried soo many things to try and fix it but wont work. This keeps burning out my 2-3 clutches.
3200 stall here.
prolly due to weak clutches...the 1-2 shift is my problem...your problem might be the 2-4 band, i know there is a pic in there that can be the wrong size not long enough......send frank a message....
http://www.cahallperformancetransmissions.com
he will build you an almost undestructable overdrive gm tranny
http://www.cahallperformancetransmissions.com
he will build you an almost undestructable overdrive gm tranny
well my bad, rumors get around i guesss i should have asked first...im goana try one person that said he could help out for almost free, then if it doesnt i guess im goana be stuck with it, till i get le2 heads custom cam and go to ed for a dyno tune