Quickin

See sig for entire set-up.

5 weeks ago everything was complete and dynoed perfectly. When I was going to pick the car up I got a call that the tranny had a minor internal leak. Another tranny was sent out, installed and re-dynoed. This time though, the converter was slipping at 3,800 rpm. The first time we didn't have that problem. The converter was sent back to Yank, checked and sent back. It's still slipping. The 2nd tranny was dynoed and checked out just fine before it left FLP.

Any ideas?

PCM maybe, and not the converter or tranny?

I'm desperate!!!! If you only knew how much. <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

Ragtop 99

iTrader: (7)

when you say the converter was slipping, can you describe under what circumstances this occurs (e.g. WOT, part throttle, hot/cold, all gears/some gears, speed, where it slips to).

Quickin

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Ragtop 99:
<strong> when you say the converter was slipping, can you describe under what circumstances this occurs (e.g. WOT, part throttle, hot/cold, all gears/some gears, speed, where it slips to). </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">It was slipping during the dyno runs as the throttle was increasingly being opened up.
On the street, the tires would break loose before the slippage would occur. But on the dyno it would slip bad at 3,800 rpm.

Ragtop 99

iTrader: (7)

so you were trying to lock the converter up at WOT and at 3800 it would not hold lock-up?

pedaltothemetal

If you are in the lock up mode, and and depress the throttle too much, the convertor will unlock and your rpms will go up. This will be normal.
What is not normal is if your transmission is slippin?

Leo

Quickin

The only way I can describe it is: The first dyno run with the first tranny and converter went fine, no slipping, did a nice pull up to 5,000 rpm. The 2nd tranny was sent out because of the leaky 1st tranny. The only thing that was changed was the tranny. They dynoed it again and it could not go past 3,800 rpm without the converter letting loose. The converter was sent back, checked and re-installed. Same thing, it can't go past 3,800 without slipping.

I'm pretty sure the converter was locked for the dyno runs.

FLP is sending a Vigilante converter to try tomorrow.

Quickin

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by pedaltothemetal:
<strong> If you are in the lock up mode, and and depress the throttle too much, the convertor will unlock and your rpms will go up. This will be normal.
What is not normal is if your transmission is slippin?

Leo </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">If the verter is locked and you want to go WOT, the motor may rev up a bit but then it should re-hook and go to red-line on the rpm gauge, right?

Once this thing starts slipping at 3,800, that's it, it keeps slipping.

Orange Krush

So guys what's the vedict on this? <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

Clutch is not locking up in the convertor properly or it is unlocking prematurely? <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

Is this problem fixable with LS1 Edit tuning? <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

Does he need a vacumn modulated tranny? <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

Would the slipping sensation be less pronounced if he had more rear gear? <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

Does he have to much convertor for that thumper of a motor? <img border="0" alt="[worship]" title="" src="graemlins/gr_hail.gif" /> (436) <img border="0" title="" alt="[Eek!]" src="gr_eek2.gif" />

Inquiring minds "NEED" to know! <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" />

Quickin

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Orange Krush:
<strong> So guys what's the vedict on this?

The clutch is not locking up in the convertor properly or it is unlocking prematurely? <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

Is this problem fixable with LS1 Edit tuning? <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

Does he need a vacumn modulated tranny? <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

Would the slipping sensation be less pronounced if he had more rear gear? <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

Does he have to much convertor for that thumper of a motor? <img border="0" alt="[worship]" title="" src="graemlins/gr_hail.gif" /> (436)

Inquiring minds want to know! <img border="0" title="" alt="[Wink]" src="gr_images/icons/wink.gif" /> </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">I spoke with Mike today, it's a VM tranny. Yank is saying it's the tranny and FLP is saying it's the verter.
Maybe I can catch a break and this Vig fixes the problem. But it just doesn't seem that it's either the tranny or the verter. 2 trannies, 1 verter that has been checked by Yank and still the same problem. Since it's slipping at 1 rpm it seems like to me that it's something else. Also, engines under spray have put out much more than 500 RWHP with these same parts and no problems, but I'm certainly no expert.
Mike has been bustin *** to figure this out, he gets the entire project completed in a couple weeks and then the mystery drivetrain problem pops up, what a Royal PITA!!!

<img border="0" alt="[bang head]" title="" src="graemlins/gr_banghead.gif" /> perfect smiley

gwj

Can you post the Dyno runs?
When you say the TC was locked, you mean manually locked? I guess you know that at WOT the TC will NOT lock up w/o an enforced lock up?
How did you determine that something is slipping, a flat spot with the torque @ 3800 rpms until?
Sorry, we're just trying to figure out whats what.

Quickin

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by gwj:
<strong> Can you post the Dyno runs?
When you say the TC was locked, you mean manually locked? I guess you know that at WOT the TC will NOT lock up w/o an enforced lock up?
How did you determine that something is slipping, a flat spot with the torque @ 3800 rpms until?
Sorry, we're just trying to figure out whats what. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Mike Norris has everything like that. I'm in Ft. Lauderdale, he's in Orlando. I'll try to get all that tomorrow.

I do think he manually locked it for the run.
The verter started to slip at 3,800 rpm and never grabbed again until the rpm's went under 3,800.

Thanks

gwj

Norris has a pretty good rep here in FL, from what I've heard he'll give you the straight dope.
It concerns me that I hear so much lately 'bout Yanks TC's.(I have an ST3500 that has performed flawlessly). But then one hears problems about different trannies and TC's. What is sad is when the customer gets caught in a pissing match between vendors: we all lose. Hope you get everything squared away,and don't be to quick to put the blame down until you can identify the source.After that, let the chips fall where they may.
BOL.

pedaltothemetal

Hi Lyle,

That's the great thing about dynoing after an install. You find all the weakness that has to be addressed then and there. Since they have our car so long, why not take care of your fuel pump.

Leo

Orange Krush

Hmmmmm....! <img border="0" title="" alt="[Frown]" src="gr_sad.gif" />

Anyone! <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

Ragtop 99

iTrader: (7)

An unlocked high stall converter at WOT is not going to drop down to 3800 rpm. Mine won't drop below 5200 rpm unless I force it to lock-up. That's half the gain of having a converter is not having your rpms drop all the back back down.

At WOT, the stock programming is to unlock the converter and let it slip. However, if the converter is refusing to lock-up using a special program in edit (I do this on the dyno) or with a manual lock-up switch or Tech II, that is a different situation.

Orange Krush

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Quickin:
<strong>
FLP is sending a Vigilante converter to try tomorrow. </strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Hey Lyle did the Vig make a difference? <img border="0" title="" alt="[Confused]" src="images/icons/confused.gif" />

WeatherGuy

Lyle,

Check your PM.

Greg

Got Me SOM

iTrader: (2)

Its probably the converter Lyle. Hopefully the Vig will fix it. What are you throwing in a vig3200 or vig3600?

Quickin

Just got home.

Mike is putting the verter in today so i hope to hear something later.

Crossing fingers.

pedaltothemetal

Hi Lyle,
I got you email the other day. I send you back already. Hope you got it.

Leo