i made a pass today with teh convertor locked. when the 2-3 shift comes at WOT the cars RPMS seem to drop alot it will go to about 4100. car feels like it then takes forever to get the RPMs back up but then pulls good. is that how its supposed to be?? i feel it is faster unlocked. rpms dont vary much from teh shift when i race. any ideas?
car feels slower with the convertor locked?? why?
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REDS HOT AIR
Buick Tweaker
- Joined
- May 24, 2001
- Messages
- 3,433
mines runs alot better with converter lockedare you recording your runs on t-link or direct scan?
If so email me the file... If not get one
I find direct scan to be a must have to get these cars dialed in .. dont know how I was going fast before having it.
what converter you running? mine droped from 5850 rpm to like 3700 on 3rd gear shift with converter locked
That's because you locked it too early. The best time to lock the TCC at WOT is AFTER the 2-3 shift. Wait a few seconds, or until you're up around 75 or so to lock it. That way the motor doesn't get pulled down out of it's power band and feel so boggy like you've experienced.
Unless you're making enough hp to run in the 10's or at least, very low 11's. Locking the TCC before the 2-3 shift occurs is counter productive.
Are you trying to run 18 psi with pump gas? How much knock did you get? Your combo (cam and improved heads, big turbo) may want to rev more, but 4100 should still be above the torque peak.
Locking the TC will even pick up a 13 second car up 2 mph in the 1/8th mile (locking after the 1-2 shift)
Locking the TC will even pick up a 13 second car up 2 mph in the 1/8th mile (locking after the 1-2 shift)
While in some cases that may be true, It's been my experience that locking the TCC before the 2-3 shift often can reduce the top end charge, and this is especially true if a good high quality clutch assembly is in use!
And while at 4100rpm he is well above the torque peak, the problem is, that far down the track, torque plays less of a role and horsepower is now the primary motivating factor
IMHO he's just suffering what many others have found. Locking the TCC before the 2-3 shift on some combinations just doesn't work
ok so is it even worth locking it in third gear?? is that even gonna be worth the .2 and 2mph?? yeah locking it in first is bogging the car down when the 2-3 shift happens. is it worth locking it now?? if so what are some people getting when they lock it in third, any gain at all?? thanks for the help guys.
oh by the way i dont have a T-link but i am gonna put a lap top hoepfully this week to get some numbers. the car is running on 20psi with no knock thanks to xylene. i ahve yet to crank the boost up as it has low miles on it. i just need to tune it since the car only went 112 the other night at hte track.
Steve Wood
Active Member
- Joined
- Jul 18, 2001
- Messages
- 2,338
Follow Dave's advice and give it a try. He has done it more than once.
Just trying to get a handle on this...
I know that most chip manufacturers lock the TCC at 45 MPH under most conditions. What is the 'standard' lock up speed at WOT? I thought my car made the 2-3 shift with the converter already locked.
I know that most chip manufacturers lock the TCC at 45 MPH under most conditions. What is the 'standard' lock up speed at WOT? I thought my car made the 2-3 shift with the converter already locked.
BM Computer Src
New Member
- Joined
- May 28, 2001
- Messages
- 429
Re: Just trying to get a handle on this...
Only race chips will lock the TCC under full throttle. Your right about 45 MPH for normal use, not full throttle.
I have always locked my converter at the line and when it hits second gear it locks. Always have gained 2-3 mph, but I'll try it daves way next time and see what mine does.
Only race chips will lock the TCC under full throttle. Your right about 45 MPH for normal use, not full throttle.
I have always locked my converter at the line and when it hits second gear it locks. Always have gained 2-3 mph, but I'll try it daves way next time and see what mine does.
What I do is launch in 2nd gear and hold the 2-3 shift a few hundred extra rpm's so when it shifts into 3rd you won't be below the power band. I gain about 3 tenths and 4 moh or so as opposed to running unlocked. You would want to make sure you have good valve springs of course.
Originally posted by jojo
Hey dave how do you get your converter to lock at 80mph? my options in the chip are 49 and 51
thanks,
jojo
I think you're confusing cruise lock (the 49 and 51 you refer to) with WOT lock (programmable in the Extender).
Dave the instruction sheet they gave me with the chip, says:
Full Throttle Torque Converter Lockup: Can be locked up at a desired MPH. The (Number X4 + 45) is the lockup MPH. i.e. 1=49mph, 2=53mph. Zero disables this feature. Program the desired number into Cell 13.
What am i doing wrong here? im curious how you get yours to lock up at 80?? when this is not one of the options listed. You said you are locking yours through the Extender chip right? and not a manual switch.
thanks,
jojo
Hey Look, thats what i was looking for. I just called Ram Chargers for some info, cause i was not looking past the examples they give in the instruction sheet
then it just hit me! why are they only giving me two options to lock my converter at such a low MPH??? duh!! of course!! increments of 4mph with each number. The formula X4 + being the base, duh!!!thanks Look
jojo
