Competition Real ET difference between a Dual vs Single disk clutch

[BigDan]

Hey I know not too many people bother racing their NV5600's but for thoes of you that have did you get a quicker ET with your DD vs Single. I know you can build boost at the line with a DD which would greatly increase the 60ft times but it also makes it harder to shift.



I ask this because I know the benifits of a 20psi 4x4 launch vs a 2500rpm clutch drop. I bought a 6 speed to avoid wanting to race it but I figured I can race when I'm not pulling.



I by no means want to get serious about drag racing again but I hear about 05-06 running 13's with their 6 speeds w/ BDDL CL.



If a DD doesnt result in quicker ET's I will probably just get a single disk.



Thanks

 

[johncameron]

I'd imagine you could launch in 3rd with a good DD clutch and save yourself a shift. I tried that once and my truck never mooved... . oops... . the OFE is still working fine for now thank god. I mustered up a 15. 8 in the 1/4 last month.

 

[jwilliams3]

when I'm not pulling.

Sledpulling?

 

[Hammer]

BigDan. .

While I do not have a politically correct or electronically challenged truck I am a member of the double disc club and may be able to answer it. First thing to consider here is one will be slowed down while attempting to speed shift a good double as they are not the most driver friendly clutches and tend to yeild unwanted results when one tries to force them to do speed shifts. Smooth is what you need to be with one not fast,smooth equals the correct results and speed usually equals missed shifts and lost races. Having had a double disc for a few years now I would say go with a good strong single if you plan on drag racing more than sled pulling as it will yield better results. Hope this helps some... . Andy



BTW. . Glad to see your feeling much better now.

 

[wildmanben]

like Andy said there, Sinlge disc would be better for racing, but not for sledpulling. You may want to decide whats more likely to be done with your truck before you get a clutch.

 

[banshee]

Not all dual discs are slow shifting. The fastest times in 6 speeds have been run with duals, too.

 

[Luken]

Not all dual discs are slow shifting. The fastest times in 6 speeds have been run with duals, too.

What would you know? It's not like you have a fast 6 speed...

 

[mcoleman]

Luken, Pack Mule over at the DTR runs his 6 speed at my local track and has ran a 13. 41 at 100. 4 with the stock clutch but it is slipping in 5th and 6th. He launches in 2nd gear and like banshee can flat throw the shifts to it. He is only running a crazy larry and an unbranded pressure box. Stock charger and stock injectors. It's an 06 Megacab on 20s.

 

[BigDan]

Luken, Pack Mule over at the DTR runs his 6 speed at my local track and has ran a 13. 41 at 100. 4 with the stock clutch but it is slipping in 5th and 6th. He launches in 2nd gear and like banshee can flat throw the shifts to it. He is only running a crazy larry and an unbranded pressure box. Stock charger and stock injectors. It's an 06 Megacab on 20s.

I by no means want to get serious about drag racing again but I hear about 05-06 running 13's with their 6 speeds w/ BDDL CL.

Yeah I already know about thoes guys.



I can speed shift(not letting off the accelerator) in all shifts except 5th which always seems to be the problem in every 6 speed I drive. I'm hearing conflicting info. Can you still speed shift at the track with a DD.



I think a 20psi 4X4 launch in 3rd would be the I TRIED TO BY-PASS THE CUSSING FILTER and then slam straight down to fourth and then ease it into 5th and the slam straight down into 6th.



by pulling I mean sleads but that's already been discussed by countless of other threads... . I know how to search.



I wish there was a DD owner near me so I could go try it out... . not racing of course. I do expect it to live up to the hype though of being a minor PITA

 

[ChrisBlevins]

Luken, Pack Mule over at the DTR runs his 6 speed at my local track and has ran a 13. 41 at 100. 4 with the stock clutch but it is slipping in 5th and 6th. He launches in 2nd gear and like banshee can flat throw the shifts to it. He is only running a crazy larry and an unbranded pressure box. Stock charger and stock injectors. It's an 06 Megacab on 20s.

Ya barking all 4 tire's when he come's off the stock clutch with a 1. 94 60 foot time. Thats my little pressure box too it really woke that truck up and too think we have just started with it. :-laf

 

[BigDan]

I had 1. 9 60ft's in my stock 02HO 6 speed w/ only an EZ. That truck was heavy and slow. QC, LB, 4. 10, 16. 7ET. All I did was drop the clutch at 2300rpm in 2nd gear.

 

[banshee]

After driving several different dual discs from different builders I can tell you this: If you're wanting a clutch that will really withstand sledpulling then you are going to give up some shifting speed. To live coming out of the hole at 3K+ in 4th or 5th those iron discs end up weighing a lot which slows down the shift. On the other hand, a lighter dual will shift as quick as a stocker, but a few pulls would probably do it in. There's really no way around it, and you have to decide what you want to do with the truck before you put the clutch in. Simple fact is that an SBC Iron Giant or EEP Puller or HMR Comp puller is NOT going to shift like a Street Drag. I have never slipped my clutch while racing, playing or towing (from overpower), but I know a couple hooks to the sled would fry it. Decide first then buy!

 

[BigDan]

Id rather have a lighter DD then a heavy one. I know pulling is hard on the lighter DD but do 20psi launches wile racing hurt it as well. I know the SBC 3850 can hold up to slead pulling but its a little heavy when it comes to racing. Do you think the SBC 3650 can handle a pull twice a year?



I know its best to talk to SBC about this but I also want to see real world cases.



Thanks

 

[JCleary]

I had an organic street dd, and went back to a single disc. The benefits of being able to do a 3rd gear launch did not outweigh the usual dd drawbacks, like loud idle, difficulty getting into gear, loud 5th gear, and finally slow shifting. Also, being an organic clutch, the engagement was supposedly smoother than ceramic or feramic material. The major drawback, however, was that I could not ever pull with it. The organic material can't take the heat. For these reasons I switched to my OFE.



My OFE shifts faster than my stock clutch ever did, and so far has held whatever I've thrown at it.



If I get the itch to pull (which seems likely) then I'll eventually go back to a SBC dd, but I'll definitely be going with ceramic friction material. I don't mind losing a little shifting speed if I can do some pulling.



Good luck with your choice. I wish I had driven a dd before going through the exercise.

 

[JCleary]

Id rather have a lighter DD then a heavy one. I know pulling is hard on the lighter DD but do 20psi launches wile racing hurt it as well. I know the SBC 3850 can hold up to slead pulling but its a little heavy when it comes to racing. Do you think the SBC 3650 can handle a pull twice a year?



I know its best to talk to SBC about this but I also want to see real world cases.



Thanks

Maybe another option is to go with a 6-button instead of 12. It must have less rotating mass, making for a faster shift.

 

[Jff24Gordn]

I'll throw my 2 cents in a little late.

I just have a little old 4500, instead of the new fangled 6 speeds. I've had single and a Haisley street twin. When I am trying to break parts by shift speed, I see no differance between any cluttch I've had; 2nd gen style stamped organic, 1st gen style cast pressure plate organic or ceramic or dual disk organic or ceramic.

I have found synchro material has alot more to do with shifts than the clutch. I dont know what kind of synchro options the 6 speeds have, so I cant help yawl.

This is on my tuck with my transmission and it is not quite normal. I can shove the shifter to 2nd sitting at a stop and it goes into gear w/o the clutch. If I do it in 3rd, it stalls the engine. One more tidbit. Has anybody else ever ripped the threads of their shift knob out on the track? This comming from a guy who kills a set of synchros in 5k miles.

 

[edgerat]

what about the 6 puck ones? They are advertised on SB's website for being "good for drag racing". When in doubt call Peter!