I posted this in transmission too but they dont wanna seem to help... or maybe they dont know, ok here's the deal I put the new tranny in... Lock up still dont work... but anyways, what happens when your torque converter stall is too high, I knew if it was too high I would have to burn another chip but I was told this TC aint that high stall and it should not force me to burn a new chip. Well this is what is happening, about 3/4 throttle when I hit about 75 the engine just dies like it has a govener on it... is that the reason? Do I need to change som crap in the chip???

 

stall speed shouldn't bother the chip.

later
tim

 

From a very technical perspective, it will effect things. Some guys say the car will need less timing down low, to keep traction controllable. While others will say advance can come in faster since there isn't much engine load until the flashed rpm but that's usually for guys running big tires or something lacking torque to begin with. I doubt you're burning your own eproms so no, it won't make a difference that you'll be able to change let alone feel. You know how mechanical dissy's use springs and weights to tune the spark curves, hook up vacuum for mileage etc. Well the ecm has it's own tables that combine all of it into a surface map. Another good reason to spend the $100 on eprom burning equipment so now you can run computer controlled timing on ANY engine even if you don't use it for fuel. Just a thought. If the motor is just reving but no power it could be either fuel or spark related. I wouldn't point to the tc for your troubles. Look at the fluid to make sure there is enough and when the engine "dies" is it revving up really high and just having a hard time maintaining speed (fuel or timing). If it's reving high and not moving check your trans fluid level and the TV cable. Might help anyways if it's been a while.
What chip are you using now and what mods are involved?

 

ok ok your right i cant say I burn chips... because I dont have the equipment to do so, but I do know how to burn chips, my friend has the burner so there is no reason for me to purchase one, and him and I go on a tune frenzy and do some tuneing burning 4-5 chips a car i a night when we are bored, so yes I do burn chips, sort of... leading to the solution to my problem, when my back was turned that little sneaky sob put a limiter on the chip, for the fuel pump to cut out at 75mph, but my speedo never worked before and now that it does because the gear in the tranny is not electric signal anymore, my speedo works and I never would have figured that the cable driven speedo sent an electric siginal to the ecm, now i know... I had known about the limiter but thought he took it off when we burned more chips but i guess not. So i apolagise to waste all your time with this but thanks for the info, it helped me figure out why it is the way it is... just gotta wait for my friend to get back into town so we can burn some more chips. Thanks all.

 

dp

 

I thought our cars use VSS input for fuel pump cut-out?

 

Yeah, that's what is posted. And it isn't the fuel pump that's cut-out, it's just the injectors. With a patch you can make it into a rev limiter anywhere from 0 to 6345rpm , it's cool when you do your own eproms.

 

"I never would have figured that the cable driven speedo sent an electric siginal to the ecm, now i know" sent doubts into my head (b/c speedo has nothing to do with VSS, right?) -- I never bothered to look whether it was speedo-driven, tach-driven (certain RPM in OD) or VSS driven... I suspected it was VSS because I have 3.08 gears and it still cuts out at 106 mph (when my speedo is past 110).

Yeah, my bad it should have said fuel cut-out --- I experienced it many a time -- if it were fuel pump cut-off I'd be in big trouble I guess (would it take it long to bump the fuel pressure back up? I don't know, I don't want to know when I'm in triple digits... )

And I know, I can't wait for my EE buddy and me to finish making our own burner ... I am an experienced low-level programmer and I can't wait to get my hands on the chip -- right now I just use WinALDL -- and then I'll join you guys on the PROM board.

This is kind of off-topic, but wouldn't fuel cut-off at high RPMs (such as for rev-limiting purposes, like that patch posted on PROM board) cause a hyperurectic (sp?) shock and eventually burn holes in pistons..

MSD-6AL just randomly drops sparks, keeping the RPMs below the limit and keeping the chambers cold and rich (instead of hot and lean like fuel cut-off would) -- another cool side-effect of dropping sparks is that you can keep the engine close to rev limit whilst having it floored and it produces marvelous sounds Also good for tires warm-up, drifting, power-on oversteer and whatnot... I tried it on some eurotrash cars, but I don't want to spend $$$ for MSD.

 

Of course the spark is better but this ecm is OEM equipment. It's impressive enough that you can set the rev limiter or mph limiter be it spark or fuel. In general, anything slower than a 12 second drag car shouldn't require holding an rpm to launch. Maybe if it's stick but then it shouldn't be drag racing often enough to require it. Holding up against any rev limiter isn't good and you'd be suprised at how well the fuel cut-off works. It sounds JUST like a spark drop system and even with the wet-flow tbi it won't dip more than a couple hundred rpms if that. I only tested it at 3500rpm and then set it to 6100. Use the fuel rev limiter as a free patch and only as a safety net. If you hit up against it because you shifted manually and went into neutral it won't do enough harm to be measurable.

 

Sweet! Can't wait to start chippin' away

 

I bet there is a way to make it spark cut-off but it would be a crued method. I'm 99.99% sure that the ecm couldn't predict which cylinder it was firing so it's out of the question to do a cut off in that sence and if you held up against the rev limiter with all spark being cut-out you'd foul the plugs. Like I said though, not really worth doing, just use it as a safety net.