How much torque can the stock GTO IRS handle
11-15-2006, 02:22 PM
#1
How much torque can the stock GTO IRS handle We are starting an engine build in an 04 GTO and need to know how much the stock IRS has handled. Any experiences would be helpful.
11-15-2006, 02:33 PM
#2
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Originally Posted by Quick Carl
We are starting an engine build in an 04 GTO and need to know how much the stock IRS has handled. Any experiences would be helpful.
11-15-2006, 03:09 PM
#3
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You have asked one of those questions that can only be answered with "it all depends". Too many factors are involved for a definite answer. For whatever it's worth, some guys have run over 600 ft/lbs with no problems....others have shredded IRS components with stock engines and less than 400 ft/lbs.
Launching without wheel hop is a big factor; and, generally speaking, the A4 guys seem to have less problems than the guys with M6s.
Launching without wheel hop is a big factor; and, generally speaking, the A4 guys seem to have less problems than the guys with M6s.
11-16-2006, 05:01 AM
#4
Thanks for the input. This is a case were it won't be used in a drag race situation where slicks or drag radials will be used. The plan is for a high HP, high torque driver that shouldn't get a solid hook-up and save the trans. and IRS for handleing. The car is a M6 and it will be making around 700 HP and 650 ft/lb's NA at the flywheel.
Does the center section usually go first or the axles ? What is the prefered clutch upgrade that retains near stock pedal feel ?
Does the center section usually go first or the axles ? What is the prefered clutch upgrade that retains near stock pedal feel ?
11-16-2006, 06:31 AM
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Can't speak for the M6 but I imagine that the driveline is a LOT more succeptable to breakage due to lots of shock on launch on the M6. I honestly think my A4 and mostly stock IRS can handle just about anything I can throw at it since the more torque and HP I throw at the stall the higher up the flash goes so, it's kinda self-adjusting (so to speak).
There's a good possibility that I'm going to go solid rear in the next few months not necessarily out of necessity but I have an opportunity to have the conversion done at a reduced cost. JM2C
Cheers,
Mark
There's a good possibility that I'm going to go solid rear in the next few months not necessarily out of necessity but I have an opportunity to have the conversion done at a reduced cost. JM2C
Cheers,
Mark
11-17-2006, 01:45 PM
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A lot of GTO guys run the LS7 clutch but I doubt that it would handle that kind of power. I've heard good things about the RPS clutches. I'd say you'd break the half-shafts or the diff first.
11-17-2006, 05:56 PM
#7
Take a look at the BMR website and their project GTO. They pretty much led the way as to what broke and when...pretty much figure, clutch, driveshaft, halfshafts, and axles. A sponsor on LS1GTO is supposed to be coming out with an axle to axle "solution" soon.
As for clutch ....LS7 wont hold up to your HP expectations. I went with Textralia, but have no road data as of yet.
As for clutch ....LS7 wont hold up to your HP expectations. I went with Textralia, but have no road data as of yet.
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11-20-2006, 09:14 AM
#9
Thanks everyone for the info. The axles and CV joints aren't bad as long as the center section isn't prone to breaking. I saw a center section casting for 9" Ford differential, but it was $2500 pretty much bare. At that point the owner may have to give up the IRS and go with a solid axle. Does anyone know how much that would affect the handleing, since this is a driver and not a drag car ?
11-23-2006, 03:47 PM
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IMO.......switching to a one peace drive shaft may cause the failure of CV joints and center section. The 2 piece Drive shaft has rag joints that absorb the shock and saves the rest of the drive train.
11-25-2006, 04:07 PM
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Originally Posted by Quick Carl
Thanks for the input. This is a case were it won't be used in a drag race situation where slicks or drag radials will be used. The plan is for a high HP, high torque driver that shouldn't get a solid hook-up and save the trans. and IRS for handleing. The car is a M6 and it will be making around 700 HP and 650 ft/lb's NA at the flywheel.
Does the center section usually go first or the axles ? What is the prefered clutch upgrade that retains near stock pedal feel ?
Does the center section usually go first or the axles ? What is the prefered clutch upgrade that retains near stock pedal feel ?
Les
11-27-2006, 07:01 AM
#14
Keep us updated as to how the launch goes. The plan is to hopefully use the tires as the fuse, since the owner wants this to be a fun driver with this much HP and torque. It sounds similar to LoBoost's set-up except NA, where it appears and sounds to be stock. I believe a launch on soft radials or concrete would do the rear in. What tires are you running LoBoost?
Hardcore; So you think it is better to leave it stock than to upgrade the drive shaft ? Has anyone looked at a carbon fiber drive shaft to absorb some of the shock like some of the race cars do?
Hardcore; So you think it is better to leave it stock than to upgrade the drive shaft ? Has anyone looked at a carbon fiber drive shaft to absorb some of the shock like some of the race cars do?
