Mike, or anyone else, Can a 4l80e be built to hold up to 2000hp at 5000 rpm at the drag strip?
4l80e capability
- Thread starter RickDLance
- Start date
Probably not. 4th gear is going to be your problem. I would talk to Rossler. I think he'll tell you the same thing.
We have a 4l80e i built behind our lbz race truck
single 476, dual fuelers, 200% injectors etc
Truck weighs 4870 with driver, went fastest time of 6.43 last year throwing low rail after the launch. Fresh injectors for this season...rail pressure holds perfect so should be a good bit faster. Our goal was to be able to run 5.90s on fuel and more on nitrous
(we also have a stock lb7 short block in the truck)
Hydraulic upgrades need to be on point, Lose 3rd and 4th accumulators, And you only need to run 4 checkballs. We are in OD by the end of the 1/8th. we run 215psi for our setup.
The issue is the od sprag will break if the overruns are not applied and it spins and grabs hard. You can either keep the shifter in M3 with a checkball omitted until your in 3rd gear then bump to 4th, or run the sonnax overrun kit. Youll also want to run a od carrier and coast clutch drum from 93-96 as the sprag is larger. Hope this helps
single 476, dual fuelers, 200% injectors etc
Truck weighs 4870 with driver, went fastest time of 6.43 last year throwing low rail after the launch. Fresh injectors for this season...rail pressure holds perfect so should be a good bit faster. Our goal was to be able to run 5.90s on fuel and more on nitrous
(we also have a stock lb7 short block in the truck)
Hydraulic upgrades need to be on point, Lose 3rd and 4th accumulators, And you only need to run 4 checkballs. We are in OD by the end of the 1/8th. we run 215psi for our setup.
The issue is the od sprag will break if the overruns are not applied and it spins and grabs hard. You can either keep the shifter in M3 with a checkball omitted until your in 3rd gear then bump to 4th, or run the sonnax overrun kit. Youll also want to run a od carrier and coast clutch drum from 93-96 as the sprag is larger. Hope this helps
Mike, at what point does 4th Gear become a problem? I am planning on pushing mine only to 500HP, but that is 900-1000 LBS of torque and that is 1000HP Turbo LS Territory. I know the 4l80e has been pushed behind Dmax before, but I don't thinking it will hold 2K unless its a really light chassis. Fastest 4L80 that I know of is 8.33@172.
http://www.competitiondiesel.com/forums/showthread.php?t=184628
http://www.competitiondiesel.com/forums/showthread.php?t=184628
There have been improvements for 4th and I'm not familiar with them as I have been out of that game for a while.
It just comes down to the OD carrier and sprag issues which were worked through. The factory 4 clutch setup has worked great for us at 1400ftlb
There are guys pushing 2000 hp thru them in LS so it should hold with the right parts.
I've been talking to Rossler about building one for the Chevelle, he says a 400 will be stronger, but I need the overdrive so we are going to "try" it and see what happens. He says I can shift into od under full power, which is something most builders can't do. He mods them with some special black majic shit for this to be possible. My car is 4400lbs, prob 1000hp and shifting at 4000-4500. Not sure on the torque but its a single turbo lb7 with nitrous, your guess is as good as mine. He wasn't very warm and fuzzy about it, but said that no one else out there can build it better, so IF I was willing to try it, then he was willing to build it (with no guarantees, other then it would be best there is)
I should be ordering mine before then end of the month. Then you need to decide on the converter, I haven't started calling companies yet but I have a few in mind and so does Carl.
I should be ordering mine before then end of the month. Then you need to decide on the converter, I haven't started calling companies yet but I have a few in mind and so does Carl.
Rossler has one in the 7's, just this last year. I don't remember who it is, but in speaking with Carl he brought it up.
I will need the overdrive also. Lenco can do it for me but not on my Lenco.
Either I buy a newer Lenco with the correct splines for the overdrive, or try a 4l80e.
Either I buy a newer Lenco with the correct splines for the overdrive, or try a 4l80e.
4l80e is what I was leaning towards when I get around to the cummins swap into my old c10, now Im wondering if I should go th400...
Jake's claims to handle 1500hp with their top end stuff, but, who knows in reality
http://www.jakesperformance.com/4l80/
http://www.jakesperformance.com/4l80/
Rossler is the best out there for the 4l80e, but they are not cheap!
brian had all kinds of issues getting him to take care of the trans he has in his drag truck. i dont think id touch one of his trans. Plus, those numbers are speculated under gas engines where the torque is at or under the HP rating hes giving.
EDIT: "trans he HAD in his drag truck" he went to rossler i believe for the current trans
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Josh, what was your rwtq? 1200ish?
No idea. I never put it on a dyno. I'm only guessing at HP based on ET, trap speed, and weight.
I Would Not recommend Jakes either.
He has been Kicked from Performancetrucks.net Forum. I am not sure if he still sponsors the LS1Tech Side of the board.
I know of 2 people personally that had issues.
One bought parts and it never worked right. Jakes would not assist in any way with technical support of there parts. Customer literally put new Stock parts back in and the issue went away. Other person finally was fed up and sent it to Gilbert at ACE and he fixed it up. But I don't know if Gilbert is still in the business. I know he closed his shop when the OKC Show Took off and went out there to help with some of the cars. That was the last I heard about him.
He has been Kicked from Performancetrucks.net Forum. I am not sure if he still sponsors the LS1Tech Side of the board.
I know of 2 people personally that had issues.
One bought parts and it never worked right. Jakes would not assist in any way with technical support of there parts. Customer literally put new Stock parts back in and the issue went away. Other person finally was fed up and sent it to Gilbert at ACE and he fixed it up. But I don't know if Gilbert is still in the business. I know he closed his shop when the OKC Show Took off and went out there to help with some of the cars. That was the last I heard about him.
Seems that there is not a trans that holds up once a person gets up into higher horsepower numbers over a 1000 . The higher the HP the more maintenance and rebuilding they require in shorter intervals. I suppose it goes with the territory, GOTTA PAY TO PLAY . I’m sure the lenco May be a different story but obviously probably more $$$ .