Whipple + Drag Radials = DS suicide

*Joshinator99* · 11-02-2019, 03:59 PM

Well, I went to the drag strip for the last weekend of the year in hopes of finally taking advantage of some good air (finally!). First run was 10.90 but at a better 130 MPH thanks to the new Griptec 3.50” pulley and 250 DA (https://photos.app.goo.gl/9V5UipNQDWVeNLSk8). With a very soft launch and crappy 1.79 60’ time, I knew a 10.50 was a possibility if I could improve my launch. I figured with a stock motor, stock manifolds, stock cats, and 20” wheels, that would be damn good for me. So I launched Full Send on the next run and it hooked! Great launch, but 20’ later it was all over with my stock DS giving up the ghost. I can’t believe how small the stock SS DS is by the carrier bearing?!? I was happy that I was running a BMR DS loop though... In any event, I just upgraded to the 3.5” GForce Engineering aluminum DS and can report it is smooth as butter out on the street. Absolutely zero vibrations and saves about 7 lbs of rotating weight too. Hopefully this one will live a little longer than the factory one!

wnta1ss · 11-03-2019, 07:12 AM

Well that stinks. I had the same thought as you on the driveshaft loop, and went with a BMR when I'd bought a supercharger 'just in case'.

*Joshinator99* · 11-03-2019, 08:17 AM

Quote:

Originally Posted by wnta1ss

Well that stinks. I had the same thought as you on the driveshaft loop, and went with a BMR when I'd bought a supercharger 'just in case'.

Yeah, I was *really* glad I had done the loop! I did the loop about 2 months ago after seeing my buddies 750 WHP Mustang do this number to his aluminum DS (believe the brand was dynatech? Never heard of them.). I think I’m more bummed out on missing out on 250 DA air than I am breaking a DS...

wnta1ss · 11-03-2019, 08:29 AM

Quote:

Originally Posted by Joshinator99

I think I’m more bummed out on missing out on 250 DA air than I am breaking a DS...

If you want to get one last fling in this season, Atco Raceway in NJ should still be open this month, weather allowing. A few years ago I went there in my SS on 'Black Friday' (local racer friend had told me about it) and got 3 runs in. NHRA track, so rules should basically be the same as at the Valley.

KingLT1 · 11-03-2019, 08:29 AM

Wow...That thing snapped off clean. I haven't seen one break there. They usually twist that coupler in the rear and bend the bolts

*Joshinator99* · 11-03-2019, 05:55 PM

Quote:

Originally Posted by KingLT1

Wow...That thing snapped off clean. I haven't seen one break there. They usually twist that coupler in the rear and bend the bolts

Well, on the bright side, those Nitto NT555R drag radials definitely hooked!

*Joshinator99* · 11-03-2019, 05:58 PM

Quote:

Originally Posted by wnta1ss

If you want to get one last fling in this season, Atco Raceway in NJ should still be open this month, weather allowing. A few years ago I went there in my SS on 'Black Friday' (local racer friend had told me about it) and got 3 runs in. NHRA track, so rules should basically be the same as at the Valley.

Tempting! I can’t believe they are open through November. Should be some great boost weather. But I haven’t bought a trailer yet, so that would have to happen before I went that far to race.

Jhunsberger · 11-05-2019, 01:08 PM

Man, thats 1 thing I was afraid of when I got my DR setup. Thru an AL Gforce drive shaft and DSS axles in. Always chasing the weakest link! Glad you didnt get hurt and it didnt cause to much damage!

*Joshinator99* · 11-05-2019, 01:30 PM

Quote:

Originally Posted by Jhunsberger

Man, thats 1 thing I was afraid of when I got my DR setup. Thru an AL Gforce drive shaft and DSS axles in. Always chasing the weakest link! Glad you didnt get hurt and it didnt cause to much damage!

Thanks! Good call on doing the axles too...that will probably be next to grenade if I don't address them soon... The BMR DS loop was a lifesaver!

steelheadrob · 11-06-2019, 09:23 PM

Something I should think about for next season. So far I havent had any issues with mine. Seems like the A8's that have had DS breaks have been at higher power levels but I havent been tracking this that closely. Missing out on DA like that I would be bummed also.

*Joshinator99* · 11-06-2019, 10:50 PM

Quote:

Originally Posted by steelheadrob

Something I should think about for next season. So far I havent had any issues with mine. Seems like the A8's that have had DS breaks have been at higher power levels but I havent been tracking this that closely. Missing out on DA like that I would be bummed also.

Agreed! Our track is normally around 2000 DA (not quite as bad as yours Rob lol), so I was looking forward to cool fall air for months...

L78toLT1 · 11-14-2019, 09:09 AM

Quote:

Originally Posted by Jhunsberger

Man, thats 1 thing I was afraid of when I got my DR setup. Thru an AL Gforce drive shaft and DSS axles in. Always chasing the weakest link! Glad you didnt get hurt and it didnt cause to much damage!

I went with Gforce shaft and axles and have to admit I'm still a little worried about the aluminum shaft after laynlo's experience. I also find it strange that most of the shaft failures are on automatic cars; I'd think the manuals would be much harder on shafts.
Jhunsberger, are you still on your original clutch? I wonder which clutch is the best option when running drag radials? When mine gives up the ghost, I'd like to replace it with something that somewhat softens the impact of launching on DR's and is as street friendly as the stocker

Jhunsberger · 11-16-2019, 11:07 AM

Quote:

Originally Posted by L78toLT1

I went with Gforce shaft and axles and have to admit I'm still a little worried about the aluminum shaft after laynlo's experience. I also find it strange that most of the shaft failures are on automatic cars; I'd think the manuals would be much harder on shafts.
Jhunsberger, are you still on your original clutch? I wonder which clutch is the best option when running drag radials? When mine gives up the ghost, I'd like to replace it with something that somewhat softens the impact of launching on DR's and is as street friendly as the stocker

I am running stock clutch. I have spent some time talk to others about possibly replacing it, but for the most part no one is having issues at my power level. So I will just run it till it needs to be replaced. I am thinking of pulling my Gforce aluminum driveshaft out over the winter, since I feel it could be better balanced.

*Joshinator99* · 11-16-2019, 12:02 PM

Quote:

Originally Posted by Jhunsberger

I am thinking of pulling my Gforce aluminum driveshaft out over the winter, since I feel it could be better balanced.

Interesting comment. I just installed a 3.5” GForce aluminum DS and couldn’t help but notice how smooth it was? Is it at a particular speed that you are noticing an issue?

11-02-2019, 03:59 PM	#1
Joshinator99 Moderator Drives: 2017 Camaro 2SS A8 Join Date: Aug 2018 Location: Petersham MA Posts: 6,204	Whipple + Drag Radials = DS suicide Well, I went to the drag strip for the last weekend of the year in hopes of finally taking advantage of some good air (finally!). First run was 10.90 but at a better 130 MPH thanks to the new Griptec 3.50” pulley and 250 DA (https://photos.app.goo.gl/9V5UipNQDWVeNLSk8). With a very soft launch and crappy 1.79 60’ time, I knew a 10.50 was a possibility if I could improve my launch. I figured with a stock motor, stock manifolds, stock cats, and 20” wheels, that would be damn good for me. So I launched Full Send on the next run and it hooked! Great launch, but 20’ later it was all over with my stock DS giving up the ghost. I can’t believe how small the stock SS DS is by the carrier bearing?!? I was happy that I was running a BMR DS loop though... In any event, I just upgraded to the 3.5” GForce Engineering aluminum DS and can report it is smooth as butter out on the street. Absolutely zero vibrations and saves about 7 lbs of rotating weight too. Hopefully this one will live a little longer than the factory one! Attached Images __________________ 2017 Chevy Camaro 2SS A8 Whipple 3.0, Mast Black Label heads, ATI 8L90, Fore triple in-tank pumps, 112mm TB, LPE +52% injectors & BB HPFP, TooHighPSI/Katech port injection, 15” conversion 1066 WHP STD/1027 SAE, 9.10@152.5 (new times coming)

11-03-2019, 08:29 AM	#5
KingLT1 Drives: 2016 1SS NFG A8 Join Date: Aug 2017 Location: 46804 Posts: 7,561	Wow...That thing snapped off clean. I haven't seen one break there. They usually twist that coupler in the rear and bend the bolts __________________ 2016 NFG SS A8/Whipple 2.9/Fuel System/Flex Fuel

11-05-2019, 01:08 PM	#8
Jhunsberger Drives: 2017 Camaro 1SS M6 (SOLD) Join Date: Oct 2016 Location: 19518 Posts: 402	Man, thats 1 thing I was afraid of when I got my DR setup. Thru an AL Gforce drive shaft and DSS axles in. Always chasing the weakest link! Glad you didnt get hurt and it didnt cause to much damage! __________________ 2017 1SS M6 Hyper Blue Metallic NPP, MMR 228 Z/28 replica wheels, Front: 20 x 9, Rear 20 x 11 Stock: 416hp/427tq, 12.21 @ 116.80 Modified 02/2019: Whipple SC w/ 3.500 pulley, LT4 fueling, NW 103 TB, Roto-Fab Big Gulp, Kooks 2" jet coated, full Borla ATAK exhaust, DSS axles, Gforce driveshaft. Tuned by EFX Tuning 688hp/632tq Best 1/4 to date: 10.705 @ 131.92

11-06-2019, 09:23 PM	#10
steelheadrob Tactical Garage Drives: 2016 Camaro 2SS Join Date: Nov 2016 Location: Idaho Posts: 427	Something I should think about for next season. So far I havent had any issues with mine. Seems like the A8's that have had DS breaks have been at higher power levels but I havent been tracking this that closely. Missing out on DA like that I would be bummed also. __________________ Tactical Garage YouTube Channel Whipple Build Member Car Journal Whipple, LT4 Fueling, Headers, Rotofab, DRs/Skinnies, Meth, E55 10.17@135.91 (@3,607 DA) Whipple with LT4 Fueling & Headers Dyno 657hp/650tq (5th Gear Dyno Dynamics)

11-03-2019, 07:12 AM	#2
wnta1ss Drives: 2017 Camaro 1SS Join Date: Aug 2016 Location: NH Posts: 1,713	Well that stinks. I had the same thought as you on the driveshaft loop, and went with a BMR when I'd bought a supercharger 'just in case'.

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