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V8 and V6 Transmissions / Driveline (6L80 / 6L50 / TR6060 / AY6) Driveshafts | Differentials | Gears | Rearends | Clutch | Shifters

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Old 03-06-2012, 09:24 PM   #1
GlennP
 
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Are drag radials on a LS3/M6 a bad idea with stock drivetrain?

I have a 2SS/M6 thats fully bolted on, 390 RWHP on a mustang dyno. The only suspension stuff done is trailing arms, toe rods & poly bushings on them.

Would going to a 20" drag radial (stock size) for drag racing be a quick way to grenade my diff/axles/driveshaft? I'm super paranoid about breaking stuff :(. I wouldnt be doing clutch dumps at 5000rpm or anything. Speaking of which, whats the max RPM you would safely consider launching at with the M6 and stock drivetrain?

Thanks!
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Old 03-06-2012, 09:26 PM   #2
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You should be fine. Just watch the wheel hop. Not sure with regards to max RPM.
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Old 03-06-2012, 10:56 PM   #3
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My stock drivetrain held up real well to 637 RWHP for 5000 miles and 700+RWHP for about 2000 miles on the stock tires (during fall and winter)
That is the only thing i attribute to their longevity.

Going to DR, you obviously raise the risk of lobbing a grenade into the fray.

I have a spare DS and axles you can have for cheap in the event you dont fare too well. My stock stuff was in surprisingly good shape upon inspection.

Just my$.02
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Old 03-07-2012, 09:28 AM   #4
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Ya,not good if you plan on drag racing we broke a stock out put shaft and aftermarket shaft with 20" Nittos NT05. We run a DSS 9" also.We do leave off of 2-step and it was set high when we broke aftermarket shaft trying to keep from wheel hope and trying to spin and the track had alot of bite so we lost. What you need is side wall to help with drive train shock. On the 2010 power tour I seen stock camaro break output shaft using launch control on a make shift drag strip at Newton,Iowa circle track. We are switch to a 4l80 this year. Just my 2 cents and laying under the car, taking tranny out to many times to count.
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Old 03-07-2012, 04:32 PM   #5
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I was told by a man that builds axles and stuff for a living.... at a very high level, of a customer of his that was throwing a heck of a lot of HP at some very under strength axles...

When he asked the guy how he maintained the axles without tearing stuff up, the guy responded, "my left foot is the best tool in my tool box."

Meaning, he slipped the clutch and was easy on the shift point releases of the clutch... and he was running 8's and 9's... He didn't break things and have to work on them because he was smooth...

You break axles, diffs, drive shafts and output shafts on stock power... pretty much anywhere, but most assuredly at the track... if you are not Smooth... I have a friend that went well over 200 passes with an M6 and 650 or so RWHP...

When my car was stock, I left the line at 3500, slipped the clutch a bit coming off the light, and when it felt good, mashed the go pedal... I was quite hard on the shift point releases... chirping every one through the quarter... (Fastest stock time 12.7 at 113 MPH on the OEM P-Zero's....)I was coached by some good people and have eased the really hard shifts a bit... I am now able to leave the line pretty much as hard as I want... due to equipment upgrades... Remember that Smooth is fast... jerky shifts and too hard of a launch are actually going to slow your times and trap speeds.

One thing that will help is some smaller diameter wheels for racing... for two reasons, less rotating weight, and the taller the sidewalls, the easier it is on the drive line... Short hard sidewalls have no give... I just sold my 18's and MT drag radials and I'm going to slicks on a 17 inch wheel.... Better traction and softer on the driveline...
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Old 03-07-2012, 04:58 PM   #6
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Quote:
Originally Posted by SSE 4 2SS View Post
I was told by a man that builds axles and stuff for a living.... at a very high level, of a customer of his that was throwing a heck of a lot of HP at some very under strength axles...

When he asked the guy how he maintained the axles without tearing stuff up, the guy responded, "my left foot is the best tool in my tool box."

Meaning, he slipped the clutch and was easy on the shift point releases of the clutch... and he was running 8's and 9's... He didn't break things and have to work on them because he was smooth...

You break axles, diffs, drive shafts and output shafts on stock power... pretty much anywhere, but most assuredly at the track... if you are not Smooth... I have a friend that went well over 200 passes with an M6 and 650 or so RWHP...

When my car was stock, I left the line at 3500, slipped the clutch a bit coming off the light, and when it felt good, mashed the go pedal... I was quite hard on the shift point releases... chirping every one through the quarter... (Fastest stock time 12.7 at 113 MPH on the OEM P-Zero's....)I was coached by some good people and have eased the really hard shifts a bit... I am now able to leave the line pretty much as hard as I want... due to equipment upgrades... Remember that Smooth is fast... jerky shifts and too hard of a launch are actually going to slow your times and trap speeds.

One thing that will help is some smaller diameter wheels for racing... for two reasons, less rotating weight, and the taller the sidewalls, the easier it is on the drive line... Short hard sidewalls have no give... I just sold my 18's and MT drag radials and I'm going to slicks on a 17 inch wheel.... Better traction and softer on the driveline...
Are you talking about me or someone else? If not me, then make that 2 friends.. As you say, being smooth is the key !!
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Old 03-07-2012, 06:59 PM   #7
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Quote:
Originally Posted by Camaro21 View Post
Are you talking about me or someone else? If not me, then make that 2 friends.. As you say, being smooth is the key !!
Yup, I was talking about you....
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If the car feels like it is on rails, you are probably driving too slow. -Ross Bentley

Horsepower is how fast you hit the wall.
Torque is how far you take the wall with you.

“If everything seems under control, you're just not going fast enough.” Mario Andretti

If you can turn, you ain't going fast enough...
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Old 03-07-2012, 08:04 PM   #8
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Quote:
Originally Posted by SSE 4 2SS View Post
I was told by a man that builds axles and stuff for a living.... at a very high level, of a customer of his that was throwing a heck of a lot of HP at some very under strength axles...

When he asked the guy how he maintained the axles without tearing stuff up, the guy responded, "my left foot is the best tool in my tool box."

Meaning, he slipped the clutch and was easy on the shift point releases of the clutch... and he was running 8's and 9's... He didn't break things and have to work on them because he was smooth...

You break axles, diffs, drive shafts and output shafts on stock power... pretty much anywhere, but most assuredly at the track... if you are not Smooth... I have a friend that went well over 200 passes with an M6 and 650 or so RWHP...

When my car was stock, I left the line at 3500, slipped the clutch a bit coming off the light, and when it felt good, mashed the go pedal... I was quite hard on the shift point releases... chirping every one through the quarter... (Fastest stock time 12.7 at 113 MPH on the OEM P-Zero's....)I was coached by some good people and have eased the really hard shifts a bit... I am now able to leave the line pretty much as hard as I want... due to equipment upgrades... Remember that Smooth is fast... jerky shifts and too hard of a launch are actually going to slow your times and trap speeds.

One thing that will help is some smaller diameter wheels for racing... for two reasons, less rotating weight, and the taller the sidewalls, the easier it is on the drive line... Short hard sidewalls have no give... I just sold my 18's and MT drag radials and I'm going to slicks on a 17 inch wheel.... Better traction and softer on the driveline...
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Old 03-07-2012, 10:10 PM   #9
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I've done about 75 passes with Nitto NT05R p315X20 on 10" wide AR torque thrusts with stock drive train, and I'm definitely NOT smooth with the left foot, though I'm working on it. 12.5@115 was my best pass last year. Nothing has broken yet.
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Old 03-07-2012, 10:54 PM   #10
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I rolled around on 20 in NT555r's and went to the track on stock axles quite a few times didn't break anything but I was gentle off the line, I never left the line at over 2500 rpm's! The car will let you know when you do a lit dry hop after the burn out! If you leave higher than that you're probably gonna blow the tires off and anytime I left under 2000 it bogged! You do have to be smooth!!
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