Hey guys I need your help. I bough Yank Pro Truck Series converter 10.5 for an 4l80e rated for up to 1200 RWHP. I was told that this converter is going to be to TIGHT for my 5.3 turbo that's going to be max 600-700 RWHP, Not do to the stall but do to that its rated for up to 1200 rwhp and I should of gotten one rated for up to 650 rwhp.


My thinking was well for 200 dollars more I get a converter that's rated for more hp and its going to be a stronger better build converter. Obviously I was wrong with this thinking but im wondering if this is a big mistake.




Did I get the wrong converter ? I don't want my car to be a dog do to a wrong converter . I don't really care if its going to make it just a tad bit slower but if its going to be a noticeable difference I guess it would matter to me. Thank you guys in advance.

 

SIZE of the converter has a lot to do with how it performs. including stall, drivability, performance etc. The reason they're recommending the smaller converter(probably 9.5"/245mm converter) is more than likely to let the turbo spool on the transbrake. with that 10.5 converter there's just to much converter for the engine to be able to get up in the RPMs for the turbo to light.

further more we offer custom designed converters incorporating our power adder and boosted application stators that allow the turbo to spool easier without having the ridiculously high stall range.

 

Ok but I allready bought the converter it was 1000 bucks ..I'm not going to use a transbrake .. what I want to know if this is a big mistake or something that I would loose minor power.. maybe I can send it back so they can make it looser ?

 

For $1000 you should have called one of the converter company's and had them recommend one for your level.

 

I should have done a lot of things in life .. but I didn't and I made a mistake and now I need to know how big of a mistake ..... I believe the difference between their 1200 hp converter b vs 600hp is that one is 10.5" and the other one is 9.5"

 

There no way for us to know because there is no info on that converter. It does say you get a free restall in the first year. So if it doesn't perform the way you like just ship it back and have them restall it for you. I wish there was more info on their site so we could better inform you but there isn't so your not going to get much help.

 

Since you have the one year free restall i would go ahead and run it and see how it performs and determine if you're happy with it.

you can always come back here with results and let us know how it did. Im sure we'll be able to give you our opinions on what you may or may not leaving on table.

Happy New Year!

-Dalton

 

Probably some of the confusion here is that the stall speed is rated at a TQ level.

Kfactor= stall speed/ sqrt(torque). So if you have half the torque the converter is rated for you won't get the same stall.

 

Where does it say the stall is set by TQ level? I didn't see that

 

Hp is a man made number to compare things. Hp is work done over time. With work being tq. That's why camshaft profile is so important when picking parts for a converter

Take for example a BM 3000 holeshot. Behind a mild 355sbc it may stall at 3000, behind a stock 283 it may stall at 2200 because the smaller motor just can't make the tq to turn any faster, but that same converter behind a 572bbc may stall at 5500rpm

Turbo motors can be tricky since we can build a lot of boost on the two step, and the technology these days has gotten way better that proper converters can be built

 

It's probably somewhere in an expiration section of every manufactures website but I don't usually see it on the individual conver page.

As FTI mentioned before if you have a free re stall if you have a torque curve or a guess at it they can probably re stall it to be more friendly.

I don't think it's a matter of the parts won't work just that it will be off for you power level.

 

So I spoke to Dave at Yank and he said that he will build me a looser converter at 3600 stall ... I told him that my cam ask for 3200 and he said it should work perfect.. I'm a little lost on how it will work but I have to trust him. He is also using a 10.5 instead of a 9.5 which I would of though he would of done . But he is not charging me anything only shipping for exachanging it...

 

That is good news!

I really like the Yank Truck Thruster 2600 in our Procharged TBSS. Blew some minds with a series of 1.6 60's in a 5100+lb truck.

 

I have a 10.5" 1200 HP 3200 stall converter from circle D behind my 5.3. I have zero problems building tons of boost on the line. Its fairly tight for driving around town but once it sees boost it gets pushed up there a bit. I can easily stall it to 4500 with boost.

 

Engineers and physicists often disagree on this.
Engineers say HP is Torque over Time, or that torque is an instantaneous measurement of HP.
Physicists say that HP is a direct measurement of energy (1 HP = 745 Watts).

 

This made me feel 100 times better

 

Personally, I would just run it. Cam size is going to make a huge difference, though. If you have a lot of duration and a wide LSA, you'll never get boost on that converter.

 

Well I allready send it back , they will make it looser and stalled it at 3600
I have a 228r cam
228/228
.600 / .600
112 lsa

 

Yeah you have a lot more cam than I do. Mine makes insane torque at low RPM so I have no issues.

 

Do you think I would have issues with my cam ? I mean like make no boost