What is the bottom end in the le5 rated for?

What is the bottom end in the le5 rated for?

most would say 350 hp at the crank


but hahn has had the le5 at over 400whp without problems////

The LE5 uses forged rods like the LNF and LSJ engines. The pistons are probably the next weakest link in that engine. I could safely estimate that 350 number as well on a constant basis. You can get over 400 if you have a nice tune and don't burn the pistons. The Hahn numbers are solid. They were actually trying to break the engine to see how far their turbo kit could go and were not able to break anything.

Thats good to know. Thanks!

Stu

Hmmm, this in nice to know.

its pretty strong for a stock n/a engine. im very happy with it.

its the 5 speed tranny u need to be concerned with

its the 5 speed tranny u need to be concerned with

do you know how much the tranny will take before it gives?

do you know how much the tranny will take before it gives?

it's rated to like 160lbs of tq
i'm not kidding

however, a lot of people have run it higher
i know a turbo2.4 running 250 lbs of tq

and thats the only reason why its great to be auto. ours is like 325

and thats the only reason why its great to be auto. ours is like 325

agreed :)

170ft lbs is the factory rated specs for the 5 speed, but as someone has said, theres a few guys running well above that limit without problems

The Hahn Racecraft Sunfire drag car uses an F23 trans. It's making over 500 HP.

Is there any way to beef up the tranny to be able to take more? Sorry i don't know too much about trannys

SEARCH i have posted this info many times as well as elecblue.....trust me the engine will handle approaching the lines of 350-400 before it goes...some say it isnt but its designed for power...after all it was designed in light of the older saab turbo motors

SEARCH i have posted this info many times as well as elecblue.....trust me the engine will handle approaching the lines of 350-400 before it goes...some say it isnt but its designed for power...after all it was designed in light of the older saab turbo motors

would you be able to send me a link to where you discussed this

info posted by my bud....thanks elec! this should hold you over...just pick whatever motor you fancy and have at it:

http://www.cobaltss.net/forums/showthread.php?t=118908

I hear the weakest part of the manual transmission is the clutch.. replace that and you help your transmission problems by quite a bit.. its just what I hear though, I have no real proof to support that.

I hear the weakest part of the manual transmission is the clutch.. replace that and you help your transmission problems by quite a bit.. its just what I hear though, I have no real proof to support that.

thats a proven fact with any transmission and the addition of power past its original intent

Well there ya go, that answers B_chobos question about how to beef up the tranny

thanks for the info.

The Hahn Racecraft Sunfire drag car uses an F23 trans. It's making over 500 HP.

isnt theirs a built F23 though...as in more done to it than a simple clutch swap?

People need to stop pulling the transmission card every three seconds around here.

The F23 is more than capable of handling over 400whp, people with cavis have done it.

People need to stop pulling the transmission card every three seconds around here.

The F23 is more than capable of handling over 400whp, people with cavis have done it.

isnt the rating gm gives what the clutch is rated for? not the tranny itself?

isnt the rating gm gives what the clutch is rated for? not the tranny itself?

i think soo.. but i'm not positive..

i think soo.. but i'm not positive..

Makes more sense to me.

isnt the rating gm gives what the clutch is rated for? not the tranny itself?

i think so to. it would make sense to rate somethings capability based on its weakest component

it's rated to like 160lbs of tq
i'm not kidding

however, a lot of people have run it higher
i know a turbo2.4 running 250 lbs of tq

i doubt that. my G5 GT(2.4L) is rated at 165ft lbs torque it wouldt make sense for the tranny to be able to be capped off 5lbs less then what its actually rated at. From what i here though about the motors or the entire car in general is that they can handle alot of crap. I plan on putting the hahn turbo in my car. The hahn turbo is rated at 8Psi, any more then that and i beleive you would have to do some mods because i think 8Psi is all the stock can safely key word SAFELY handle lol. However if you put Meth Injection you may be able to crank 10PSI out of it stock from what im being told by the people who are going to be tuning my car. But there looking into it a little furthure first since my car is a daily driver. So i may just go the safe rout and stay at 8psi.

i doubt that. my G5 GT(2.4L) is rated at 165ft lbs torque it wouldt make sense for the tranny to be able to be capped off 5lbs less then what its actually rated at. From what i here though about the motors or the entire car in general is that they can handle alot of crap. I plan on putting the hahn turbo in my car. The hahn turbo is rated at 8Psi, any more then that and i beleive you would have to do some mods because i think 8Psi is all the stock can safely key word SAFELY handle lol. However if you put Meth Injection you may be able to crank 10PSI out of it stock from what im being told by the people who are going to be tuning my car. But there looking into it a little furthure first since my car is a daily driver. So i may just go the safe rout and stay at 8psi.

the F23 is definitely rated at a low number like 160ft-lbs, go look it up. and you cant rate an engines durability based on what kind of PSI it can hold...you have to go by power.

the F23 is definitely rated at a low number like 160ft-lbs, go look it up. and you cant rate an engines durability based on what kind of PSI it can hold...you have to go by power.

yeah but why would they rate a tranny for less then what the car is rated for lol. Basically that means your tranny is already taking to much from your stock car lol.

i doubt that. my G5 GT(2.4L) is rated at 165ft lbs torque it wouldt make sense for the tranny to be able to be capped off 5lbs less then what its actually rated at. From what i here though about the motors or the entire car in general is that they can handle alot of crap. I plan on putting the hahn turbo in my car. The hahn turbo is rated at 8Psi, any more then that and i beleive you would have to do some mods because i think 8Psi is all the stock can safely key word SAFELY handle lol. However if you put Meth Injection you may be able to crank 10PSI out of it stock from what im being told by the people who are going to be tuning my car. But there looking into it a little furthure first since my car is a daily driver. So i may just go the safe rout and stay at 8psi.

im not running meth or a built engine or tranny and im am 11 psi for almost 2 years but im automatic

im not running meth or a built engine or tranny and im am 11 psi for almost 2 years but im automatic

lol...who cares then. we all know the 4t45 is a beast
yeah but why would they rate a tranny for less then what the car is rated for lol. Basically that means your tranny is already taking to much from your stock car lol.

idk...ask GM, but they did it

either way im putting on a stage 3 spec clutch anyways for the hahn turbo im getting in the summer.