Ok, I've just about had it with this freekin converter.
It's stalling @ 1200 RPM, it's supose to be a 1800 stall.

Now here is how my drive train is set up

38" ties, 4.10 gears, auto. See sig for mods.Used to be 3.55's.

The trans place is trying to tell me (over and over again) that my tires are the problem.
I'm calling BULLS*!T.

I dont care if I have 29" tires or 44" tires the **** stall should be @ 1800.
When I hit the go peddle (foot not on brake) it will NOT go past 1200 till I start rolling then the tach goes with the speedo

Am I incorrect on this?
The problem I'm having is the turbo just wont spool even with the big sticks and box till 17-1800rpm, so @ 1200 it just sits there and blows diesel out the tail pipe, looks like a old freight train it's so thick.
And my HTB2 just inst that big to have these problems.

I'm getting ready to swap in a 4th converter that will be a higher stall but at this point I'm doubtfull. and no I'm not doing it, he is going to pay a shop to install it this time.
I dont have the money to get a DTT or Goerend converter like I would like.

Guess I just wanted to rant for a min. But seriously I have been around auto tranys for a long time building little go fast trucks etc and I have never had an issue with a converter stalling to low and after going through 3 converters already I'm getting bummed.

Anyinput at this point would be great.

BTW, the company I bought the trans from has benn VERY nice and they are working with me to get it where it needs to be I'm just having a hard time spending $45.00+ on oil every time I have to swap the dang thing.

thanks
dan

 

First off I'm no real expert but I think your tires do play a factor?
That said though there is a difference between stall and efficency.
My converter stalls at 1600 but the truck needs a large amount of brake peddle pressure to keep it stopped at idle since its very tight( me no likey) so if I let off the brake at idle the truck will be up to 30mph in drive in no time. When I drove Piers truck it had a 1800rpm stall converter that was fairly loose so it spooled way faster to 16-1800 and then hooked hard( me likey) so if they built the converter real tight and you combine it with your huge tires its a combo you no likey. With a smaller tire your rpm would come up much faster. JMO

 

I can agree and disagree with the tire statment.
Tell me how it matters what dia of tire I'm running, The converter isnt locked durring accell it's supose to slip to a certin "stall" then off you go.
If I apply my brake and hit the go peddle the RPM goes to 1250 and just sits there.
So how does that have anything to do with tire size? I can see the tire size comming into factor afer you get rolling but not from take off (dead stop).

What I'm looking for is a 18oo stall converter, I hit the go peddle and the rpm goes to at least 1800 and I start to move.

Maybe I'm asking to much but I dont think so.

Anyone else?

dan

 

Lock-up and stall are two different things. Lock-up is controled by a computer and stall is fluid flow over the fins. In any of my converters I have had when you get to within 3-4 hundred rpm of its stall speed they got tight enough to spin the tires. Even my 8" 5800rpm TCI Nitrous converter will spin the tires by 4800-5000 rpm if I dont really jab the throtle. Your large tires take huge torque multiplication to turn over the small stockers that equates to the amount of power needed to turn them. Like you said your large turbo isnt spooled till after the converter is tight. The smaller tire just takes less effort to turn, in turn getting your truck to move.

 

I agree with you. The truck will start to move long before the stall speed. The only way to find out true stall speed is to put a transbrake on it. Why dont you just have the company re-stall the convertor a couple hundred rpm higher. There are alot of factors that play into the factor of convertors stall speed. If you change the HP and TQ of your motor, you change your stall speed. Tire size will also play a factor in the way a convertor acts, once you are moving.

 

Well we have changed the converter 3 times now. One time was due to a faulty valve in the valve body that was causing drag in the OD clutch pack and not allowing full line pressure for lock up so it just toasted the entire trans/converter. second time was to change the stall and it was no differant, third time there was something wrong with the new converter (inside) it just wouldnt line up. So now we are going to go for a fouth time.
I am in the process in taking the 38's off and switching to 36's as well. Just hate to take off a set of tires that arnt bairly half worn and over $300.00 each. However I do under stand the extra power/brakring required to move and stop the larger tires so I'm willing to do it.

Just getting tired of buying cases of oil and R & Ring the trans.

I understand the truck will start moving before the advertised stall however, I should be able to apply the brakes and at least get it to 80% of the advertised stall no? Should be able to get it to at least 1400.
This is supose to be a 1800 stall.
It WILL NOT go beyond 1200 RPM period.

I guess I just wanted to rant a bit.

The company I got the parts from is being VERY helpfull and fully standing behind thier product so this is not a complaint about them. The guy I deal with is very nice and understands what I require to make my truck useable and is working with me to make that happen.
Just need some other input to make sure my requirements are not out of the resonable area.

dan

 

Hey Zuk
Its good they are standing behind their product because I have dealt with a few that wouldnt. The other thing you could try is a faster spooling turbo or compounds. I would guess with the stock turbo and the fuel you have you would be very happy with the drivability even with the big tires. The problem is your just not making enough power at 12-1400rpm to stretch out that converter. Even a stock size tire and your combo wont be great, just a little better. I would keep the tires and look into a small set of twins. Good luck with it I hope they come up with a converter you are happy with

 

I would love twins but I'm just not in the position right now to spend $4500+.
So I'll switch my tires and attempt to get a converter thats just not so tight.

dan

 

i had problems with mine they were making it wrong though. but mine stalls on a pulling truck and it`s stalls out at min 2800 rpms so i have help the brake and i can get 3200rpms before it wants to move. i would say tey have the wrong stall in it from everything i have went though

 

My truck does the same thing yours does Zuk. I have a goerend converter, and he has since raised the stall a little on his new converters, but when I mash it, rpm's go to 1200, and then when the truck catches up with that, the turbo will finally spool around 1500, and its fine. Taking off with a load, it is really too tight, but its awesome once you get rolling. Its just aggrovating. I have 3:55's, and 285's, and I dont get spooled in 1st till around 20mph. But, I can power brake it, and bring it to 1800 and then the tires start spinning, so the stall is 1800 or so, but You have to get on top of the turbo to reach the stall. And it sounds like you cant get on top of your turbo to reach the stall. So yes, a looser converter would help you out.

Eric

 

Thanks, that's what I have been thinking as well. Found a local company that builds triples for a good price and will build to my specs so I'm thinking I'll give it a try. Going to go with say around 1800 at least. Also seriously thinking of switching back to the 35's on a more permanent basis.

BTW the Trans company bailed on me. He had some problems with the plant that was assembling them for him so he decided to build them in house and it hurt him I believe. To bad he sure was a nice guy. But I sure cant endorse his product any longer. This conver deal was in my oppinion was caused by lack of follow through on the converter manufacture. They just kept sending out the same part# thinking it would just magically get better. It didnt.

dan

 

I would think that bigger tires would cause the TC to flash higher than smaller tires. Your truck has to work harder to move the truck than with smaller tires. 1200 rpm stall is brutal. I had a 1400rpm BD TC and just hated it. My truck would smoke and slow to spool. My current 2000rpm TCS converter is so smooth and the spool-up is pretty sweet. I usually drive my truck in OD so the higher stall doesn't bother me. I don't now the value of running a low rpm stall in a truck.