heymoej

iTrader: (67)

[QUOTE=Black LS1 T/A;9008992]OK ... I've gone thru five tranny rebuilds and none last thru the year.

i am a little confused? are you saying you have gone threw 5 performabuilt trannys? if so we need to talk...........

performabuilt

iTrader: (25)

Well if thats a planet you had at some time I can tell you what happened there , Its a cheap non oem japaneese chineese planet , That planet is actually weaker than the stock 4 pinion planet.You would never see one of those in a performabuilt unit.And we have never built a unit for either of these.
Frank at PerformaBuilt

TXCAMSS

iTrader: (60)

There is something weird going on. Looking at your logs, it's almost like their is a calibration issue with the tach or something. If you are rolling into it off the line you may be caught between cruise and WOT tables. I tend to normally trust the rpms as a reference to where the car is shifting as it is going to drop once the next shift is actually made. The gear command could be delayed for a variety of reasons so I do not log that PID. Your shift extension is all over the place as well. It should be pretty darn consistent unless you are shifting at a much lower or higher rpm. On that one log you shifted at 6500-6600 and your SE was over 1000 off between 1-2 and 2-3 ?

I set my shift points at 6500-6600 and they nail the shifts at that rpm as expected unless the trans fluid is abnormally cold or the air quailty is stellar and then we are only talking maybe a 100 rpm variance.

I would try logging with the minimum PIDs (eliminating the shift command) and see how close your shifts based on rpms are to where you have them commanded in the tune. They should be consistently within a few hundred rpm. A loose TC will allow some over shoot especially at the 1-2 shift.

Keep in mind that when you spin off the line, it really throws the pcm for a loop so you may end up chasing your tail until you get her to somewhat stick.

Are you vacuum modulated?

The transmission issues I have no idea. That would be a good question for the builder, but there is something going on, but I would not be manually shifting that transmission. If you downshift after a launch it IS going to wanna break something.

Stab N Steer !!!!!

Good luck!

Black LS1 T/A

[quote=heymoej;9010636]Some time after I got the supercharger in, the pump failed. I took the tranny out, bought my first yank converter and installed a tranny cooler. Ran fine about a year or so.

The first time I tried to do a pull with the 422 and my ET Streets ... the FIRST pull, it wiped out 3rd and 4th gear.

I bought a "Performance Tranny" I was told would hold up to my power. I made it thru the rest of the summer, but the next summer I went to the strip it went bye-bye. 3/4 clutches again.

Another guy who claimed he had built trannies for guys up to 800 HP convinced me to give him a try (one guy he built one for corrobarated). He put the Z-Pak? in it. I made it thru that summer ... 3/4 hasn't failed on me anymore, but then the planetary broke. He said he would make good on it. Took it back, the next time the sun shell broke. The last time the pump shredded all to hell. Each time he did not bill me for his labor, but I had to crawl around on the concrete to take that sucker out, put it back in and I paid for the parts. I got tired of looking at a 4L60E, but don't want to revert to a 3-speed transmission.

Since the last time I took it to him, it has been fine. But, needless to say, I don't have a lot of confidence in this build over the long haul.

performabuilt

iTrader: (25)

We have seen this before. And it will kill the 3-4 clutch quick. I cant say this will fix yours but it has fixed a couple others when its come up. Customers of ours have reported back the fix is how I know about it. Theres a setting to do with the TPS when you look at it you will see it is set at 60 move it up to 70 , in the few cases we have been involved in that solved it. It seems to happen on some cars with either larger MAFs or CAM and HEADS and LOOSE stalls. Its seems to vary a couple people I have run into with the issue it was intermtant or TRACK ONLY and a couple others it was any time they went WOT. Hope this helps. I wish I could tell you exactly what the name of the setting is. But cannot remember but I told another guy about it a few weeks ago and when he looked he had no trouble finding it.

Mike101

iTrader: (3)

I will send my tranny back to FLT to get refreshened and it would be practically brand new..check it out https://ls1tech.com/forums/lsx-parts-sale/887485-fs-level-5-4l65e-flt-c6-z06-wheels-w-tires.html
great way to save some money!

Black LS1 T/A

Outstanding! Thanks for the info!

It definitely feels like it is TPS related. It mostly happens at the track. I run great on the street. But, in important races back home on country roads, where we do long burnouts and even put a little bleach down to heat up, I et the same thing.

Disappointing.

The car runs like a bat out of hell, but when I race, it falls on it's face. It seems to be related to when I get good traction, that's when it happens. With my Street tires or less sticky drag radials on, it just spins thru the gears, but it shifts predicatably about 300 or so RPMs after the shift points I've set.

Black LS1 T/A

And yes, it has occurred to me that is why it's so hard on the 3 & 4 clutches, with all that early shifting and so much torque behind it.

Black LS1 T/A

Do they replace the clutches when they re-freshen? Will it be warranteed when they send it back out?

Thanks!

99Hawk262

iTrader: (19)

Yes, they replace anything that shows signs of wear....basically, when FLT refreshes a tranny, you get the same thing as if you'd just bought a brand new unit. That was one of numerous factors behind my purchasing one from them.....lifetime refreshes for a very small fee, and lets not forget their bulletproof reputation!! As for warranty, I'm sure it would come with one but you'd need to PM Vince and ask him.

Black LS1 T/A

Maybe I'm denser than your customer, but I can't find a parameter with that value of 60 that seems related.

Here are some TPS/MAF/MAP related parms I find; do any of these ring a bell? (If not, if you can get the calibration section from that customer, or dig it out of your memory, I'd much appreciate it.)

(Engine Diagnostics)

MAF Parameters
Parm and Value: MAF Test Max TPS: 50
Maximum throttle position (TPS) allowed to run the MAF frequency fail tests.

TPS Parameters
Parm and Value: TPS Test Min MAP: 55
This is the lower MAP threshold to allow the TPS diagnostic tests to executed.
A failed TPS diagnostic test will set DTC P0121.

Parm and Value: TPS Test Max MAP: 65
This is the upper MAP threshold to allow the TPS diagnostic tests to executed.
A failed TPS diagnostic test will set DTC P0121.

TPS vs RPM Test Lower
(This is a range of RPM values vs TPS%)
For this diagnostic test the PCM will monitor the actual TPS position and engine RPM then referring to this table will expect the TPS to be above/equal to these values for a given RPM.
For cammed cars that idle above stock RPMs the lower thresholds may need to be lowered to stop a TPS fault code being set.

TPS vs RPM Test Upper
(This is a range of RPM values vs TPS%)
For this diagnostic test the PCM will monitor the actual TPS position and engine RPM then referring to this table will expect the TPS to be below/equal to these values for a given RPM.

performabuilt

iTrader: (25)

I will try and get info, I think its this one but I am not sure,
Parm and Value: TPS Test Max MAP: 65
This is the upper MAP threshold to allow the TPS diagnostic tests to executed.
A failed TPS diagnostic test will set DTC P0121.

Black LS1 T/A

I think I've set that code, too

So you would set the value to 70? Or a bit higher?

LS1curious

what power adder,how heavy,how many cubes,what is the power band ? a 4l60e can in some circumstances survive that type of power but typically its a crap shoot. There are only a handful of units proported to have survied that type of abuse for any real length of time. The trick is shifting the unit just right. I really think your goals are a bit unrealistic for a 4l60e. there are other alternatives.

performabuilt

iTrader: (25)

They told me they set it at 70 but it may vary in different cars and I will tell you I am not a tuner, Just going on what I was told

NicD

iTrader: (7)

If you don't want to have to worry about that code coming up and ruining your shifting and potentially your tranny just disable it completely by setting the TPS max to 100 and TPS min to 0. Setting it higher slowly bit by bit works as well to find the threshold but it's a trial and error and not worth it IMO.

TXCAMSS

iTrader: (60)

That's exactly what I did also. Inever expoerienced the symptoms you described, but I go the the tip from a fellow LS1tech member a while back.

It makes sense. G/L!!

Black LS1 T/A

Thanks again, guys ...

Gilbert@Ace Racing

This is the correct strategy to use in racing apps. Anything else is going to cause erroneous ehift points under power.

I highly recommend you run a Vacuum Modulator on your tranny.

I tell folks each and every day that taking a 4L60E into severe duty is a compromise at best. You have to resolve yourself to the fact that you will break the unit from time to time. It is inevitable. It's Drag Racing friend!

I tell guys that unless I am building a 2,500 H/P Glide anything else is a compromise! Meaning, if you want to keep a medium duty transmission in a severse duty application expect it to break. The best builders in the business cannot predict a hard parts failure, they can only build the unit using the best components, best skills and secrets they know to use.

Sometimes though, the units with the best parts do not last long because they were not setup properly. The 4L60E is not for everybody's bench.

Good luck. if you would like to discuss your car in detail feel free to call me. No problem making the time for a fellow drag racer!

g

Caveman

iTrader: (2)

RE: Black LS1 TA
For one thing I dont know why at that power level you are trying to run without 28" tires, that car has no traction which is probably a big reason you keep breaking trannys. My car has a very similar power setup and cuts consistant 1.32 to 1.36 60's at 3685lbs.