What RPM Torque Converter

[kmcminn]

Hughes GM20 with 2000rpm stall in a TH400 behind a stock LQ4. I couldn't be happier with how it works. Does not run through the brakes and will crawl great on the technical stuff. Supposedly has stator modifications for more torque multiplication. My transmission cooler fan is thermostat controlled and does not run very much. The low price was a bonus: http://www.summitracing.com/parts/hup-gm20

That is the exact one I was looking at!

Good!!!! No more killing it on hills

Good!!!! No more killing it on hills

Good!!!! No more killing it on hills

Bradley, you don't have to worry about yours stalling out cause your gayzr is an auto.

 

[B.DRAKE]

Bradley, you don't have to worry about yours stalling out cause your gayzr is an auto.

ATS RIGHT!

 

[pushrod-racing]

I have a 600 hp big chevy with 228-234 601 lift Dane cam. I have built trans and a1100 13 in converter and Looove it. My motor idles at 900 rpms with no brake issues and no slip in the rocks and will hold back going down hills.I don't understand you guys running loose converters in rock crawlers.

You have an 1100 converter? A stock torque converter is a higher stall speed than that?

 

[Pumpkin]

Re: Re: Re: What RPM Torque Converter

You have an 1100 converter? A stock torque converter is a higher stall speed than that?

With a custom built converter, they can get those low stall speeds and still use big cams.

 

[halcat]

Correct pumpkin, hardened hub, brazed fins, hardened lugs for bolts. Less slip, less heat. My converter was built by TCI to match my trans. Mymotormakes big power down low and didn't want to loose anything off idle. Plus with engine braking and low stall, it's like a manual trans crawling and going down hills.

 

[kmcminn]

Hughes GM20 with 2000rpm stall in a TH400 behind a stock LQ4. I couldn't be happier with how it works. Does not run through the brakes and will crawl great on the technical stuff. Supposedly has stator modifications for more torque multiplication. My transmission cooler fan is thermostat controlled and does not run very much. The low price was a bonus: http://www.summitracing.com/parts/hup-gm20 They also have a heavy duty sprag version: http://www.summitracing.com/parts/hup-gm20hd/overview/make/chevrolet

Sawzall, how does yours do when trying to crawl?

 

[Sawzall]

Sawzall, how does yours do when trying to crawl?

It works great crawling. Granted, I have never ran a custom converter in an offroad rig. I just can't imagine finding a converter better suited for my buggy and the way I use it. We like level 5 trails and we try to crawl the object first. If we can't crawl it, then the beat down begins.

 

[kmcminn]

Ok. The old trans is nice in granny gear and first for crawling and the 2nd if I need to hit it a little harder. Just don't wont to lose. The ability to crawl stuff with to high of a stall.

 

[payne97]

I called Hughes just sent the 2nd 1 back did workout
Called PTC I was told 2 fill out the Internet sheet did that Monday and was told will called me next day today is Thursday
Called PATC and was told well I sale alot of these didn't ask any info
What else is out there

 

[muddinmetal]

I called Hughes just sent the 2nd 1 back did workout
Called PTC I was told 2 fill out the Internet sheet did that Monday and was told will called me next day today is Thursday
Called PATC and was told well I sale alot of these didn't ask any info
What else is out there

Ask for Ed or Kenny at PTC, they really are the best

Acc is local to ptc, but isn't really geared toward custom applications much like tci

All the other custom companies start at $500 and can run 4x that

 

[jccarter1]

Don't use ACC I know him personally and have used a few of his converters they just don't act right PTC is good people, Ed is a good friend and he rides all the time he understands how rigs are being used just make sure you have as much info as you can to help get the right converter

 

[rajincajingt]

PTC built me a 10" for their th400 behind my 5.3 with a 1500RPM stall and i love it for crawling. power is good to go right off the idle

 

[payne97]

I'll call PTC again but when a got my motor done I called them 2 get price they said I needed a 3600 stall

 

[jccarter1]

PTC built me a 10" for their th400 behind my 5.3 with a 1500RPM stall and i love it for crawling. power is good to go right off the idle

Not trying to be a **** but you might have heard them wrong bc stock th400 converter is around 1500 for a 5.3 it would be more like 2800-3200 depending on cam/gears and a 10 inch converter is usually what is used to get 2800-4000 stall

 

[jccarter1]

I'll call PTC again but when a got my motor done I called them 2 get price they said I needed a 3600 stall

Depending on your setup that could be about right what are your specs on the rig

 

[rajincajingt]

Not trying to be a **** but you might have heard them wrong bc stock th400 converter is around 1500 for a 5.3 it would be more like 2800-3200 depending on cam/gears and a 10 inch converter is usually what is used to get 2800-4000 stall

turns out, he will build you whatever you want - you just have to ask nice. it been a few years, but it was as low as he wanted to go on the rpm.

i have some video if you like, its very low.

 

[payne97]

4500 pounds LQ9 LS3 heads intake should make 550hp 400 turbo 1.45 first gear 205 1.96 low 4.56 gear 40" tars
cam gross lift .617 .593
duration 231 242
lobe separation 112
trails and rock crawling

 

[jccarter1]

With those specs I think a 3300-3600 would be about right you might have a little more flash stall than you are used to but I think you will love how the power comes in, also ls motors like high rpms and that cam will need 3300 at least to not load up (side note people talk about stall rpm a lot but most don't understand what it actually means. For example just because you have a 3300 stall doesn't mean it won't move until you reach 3300 rpm it means that the converter is applying all fluid pressure at 3300 so in your rig that would mean in high gear high range your converter would slip a lot until you get the rpms up but in low gear low range there isn't as much force required to turn the tires so it will start to pull around 1000-1200 and will be locked up around 2000) hope that makes sense stall rpm is a special type of vodoo Magic that takes a lot of understanding of how it works to get the best setup. Every different aspect of the rig effects the stall rpm weight, gears, motor output, motor power curve, transmission and rotating mass/ parasitic loss

 

[417chevy]

I'm in the market of looking for a stall as well but not sure what to go with considering the 6.72 gear ratio what are the 500+hp rockwell rigs running for a stall range


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[417chevy]

With those specs I think a 3300-3600 would be about right you might have a little more flash stall than you are used to but I think you will love how the power comes in, also ls motors like high rpms and that cam will need 3300 at least to not load up (side note people talk about stall rpm a lot but most don't understand what it actually means. For example just because you have a 3300 stall doesn't mean it won't move until you reach 3300 rpm it means that the converter is applying all fluid pressure at 3300 so in your rig that would mean in high gear high range your converter would slip a lot until you get the rpms up but in low gear low range there isn't as much force required to turn the tires so it will start to pull around 1000-1200 and will be locked up around 2000) hope that makes sense stall rpm is a special type of vodoo Magic that takes a lot of understanding of how it works to get the best setup. Every different aspect of the rig effects the stall rpm weight, gears, motor output, motor power curve, transmission and rotating mass/ parasitic loss

X2 took me forever to figure out the little knowledge that I have about stall converters it's kind of like how a positrac rear end in a Plymouth works it just does lol


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