I'm running a $32B EPROM in a 1227165 ECM (87 vette).
There's a few things the I can't seem to get from an archive search. First, is "low gears" 1-3, and "high gears" 4th(OD)? There seems to have been some argument over this.

Second, what relation do the TCC constants have to the TCC tables and which is the "master" figure? Because the constants only have speed, are they absolute no matter what the TPS indicates? Or do the tables override the constant settings?

Thanks.
(BTW: Great board!)

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Joe Cygan
His: 87 Black Convertible Automatic, all stock
Hers: 85 White Coupe Automatic, Wolverine Cam, NOS-150,MSD, Borla Exhaust
http://www.cygan.com

 

Usually low gears are 1-2, and high 3-4.

Your TTC guestions have me confused.
How about naming which constants you looking at. By master do you mean Forced Losuk up?.

 

Ok, sure.
In TunerCat there are the ECM Constant entries for TCC Unlock/Lock MPH for each high and low gears.

But, then there's the tables for TCC Unlock/Lock with MPH:TPS% for each high and low gears.

My question would be if I set it not to lock in low or high gears below 40MPH in the constant(MPH Only). Then the tables only come into effect Over 40MPH??? So, both have to be true for the lockup to occur, not either to be true.

For example:
I'm driving 35MPH, even though the TPS table shows to lock 28MPH:26.2%TPS, If my throttle is at 20% it still wont lock because I set the constant to not lock below 40MPH?

I have no idea if I'm explaining this well, if you like, I could put up a screen shot of the TunerCat entries.

(if you have an extra minute, I can't find a reference to Fan PWM Duty Cycle% vs. Coolant Temp. in the archives either. What's a fan PWM duty cycle? I thought it was either on or off)

Sorry to ask what might seem like stupid questions, I'm trying to get as much as I can by searching the archived posts.
Thanks for your reply.

 

Read my post, i dont know if it will help or not, it seems nobody really knows. i think i will email tunercat and see if they have any explination. i know im using a different ecm, but i essentially asked the same question.

https://www.thirdgen.org/messgboard/...ML/001855.html

 

There were some referemces to PWM controlled fans but I don't think any of them are F Boc related.

The TCC has a min enable temp..

The TCC only locks under a given set of circumstances, ie min TPS, and road speed. to little TPS and it opens and too much TPS and it opens, often there is a forced apply at high speed.

Is that what your asking?.

If not what is it your trying to change?

 

I'm trying to eliminate lock-up below 40MPH as much as I can. And, allow lockup at "highway" cruizing speed.

Mainly I guess I was wondering if all the entries are evaluated together and if they are AND'ed or OR'd to come up with the final decision to lock or unlock.

 

thats a good question, i never even thought of the graphs and constants working together or independantly. The way i was explained it was that first will never lock up. 2-3 are your low gears, and you want your high gear, 4th gear locked at cruising but not at wot.
in my hypertech chip, they moved the constant tcc lockup numbers up from stock by 12mph, on each setting. somthing like 48mph in my bin for a stock 92camaro w/ 305.
so i think if you modify your low gear table so that its impossible for the converter to lockup under something like 30, by setting the lower line above the higher line and have them cross. it wont lockup on you. till over 30. then again, that might not be the best thing in the world in terms of the converter heating up.

so i think they are OR'd but im not sure.

anybody know how to rig an led to show tcc lockup on/off?

ive decided to leave my graphs stock for now, until somebody else figures out the meaning of them

 

Folks, you should do a search on this board concerning the TCC lockup. Look for a fella named "PJ Moran". He has done much research on this topic, and his posts will set you straight. There is more to it than just the lock/unlock constants. If you set the constants for low gears really high, in order to prevent lockup, it still will lock in low gears. I found that out myself. You also have to mess with the tables.

As far as that min temp to enable lockup, where is that located? Hidden in the machine code no doubt!!!

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Best ET 14.413 @95.57 without
pulling valve covers or manifolds.
Also with stock 2.77 rear end!!!

 

click the link i posted above. he responded to my post.

well, it looks like pj does know the $32B table, but in mine there are 2 lines. guess im leading some to think too complicated, my ecm must be different, or the hacks are different or something. maybe its the def files, i dont know where the split comes in that i have 2 lines on my tc charts and you guys have 1.

[This message has been edited by snflupigus (edited August 28, 2001).]