2wd launch tips - Competition Diesel.Com

skubasteve · 10-08-2012, 12:11 AM

just like the title says.... been to the strip once so far and having a hard time getting traction. wondering if y'all have any tricks for launching. I have a QCLB 2wd.

SPEEDSHIFT · 10-08-2012, 01:32 AM

............

SPEEDSHIFT · 10-08-2012, 01:32 AM

slicks + Caltracs

Lostnwalmart · 10-08-2012, 02:35 AM

Do a really really big burnout

DirtyMaxx03 · 10-08-2012, 07:52 AM

Practice....a lot.

Gibson · 10-08-2012, 01:59 PM

Soft sticky tires

Hurley · 10-08-2012, 02:15 PM

start in 4th

(all reasonable responses have been posted)

*TMONEYDIESEL* · 10-08-2012, 02:21 PM

Manual or auto?

RacinDuallie · 10-08-2012, 02:29 PM

skubasteve · 10-11-2012, 10:10 PM

Manual 6 speed, clutch isn't strong enough for 3rd gear launch let alone 4th gear lol
Was thinking of gettin some large diameter DR and fabbing up some removable traction/ladder bars. But then again if I go with a smaller drag radial I could probly take off in 3rd.... Hmmm

Any cool threads for homemade traction bars? Nice to see where people are mounting them before I start measuring/fabbing

Gibson · 10-11-2012, 10:45 PM

Not many ways to mount traction bars. One end on the axle. Other end where the drive shaft flexes on the frame, to be simple. But maybe you should get a stouter clutch and stickier tires or softer suspension

diesel_importer · 10-11-2012, 10:55 PM

Auto 2wd is hard enough in these nose heavy trucks.....

skubasteve · 10-11-2012, 11:23 PM

Quote:

Originally Posted by Gibson

Not many ways to mount traction bars. One end on the axle. Other end where the drive shaft flexes on the frame, to be simple. But maybe you should get a stouter clutch and stickier tires or softer suspension

all of this is in the plans but the wallet has to take baby steps after my last few mods...

looking for really just tire size/psi preference, rpm/gear to launch at/in. weights on the bumper... stuff like that. more "diesel truck" specific things not just general racing

thanks

dangerous06 · 10-12-2012, 08:10 AM

500lbs in the bed works well! 17 x 12 rim with a drag slick. Check Jegs for tires!

Gibson · 10-12-2012, 11:37 AM

Quote:

Originally Posted by skubasteve

all of this is in the plans but the wallet has to take baby steps after my last few mods...

looking for really just tire size/psi preference, rpm/gear to launch at/in. weights on the bumper... stuff like that. more "diesel truck" specific things not just general racing

thanks

That's kind of hard to give. Unless we know ever aspect of your truck. Other than 'QCSB 2wd 6sp'. I couldn't tell you an exact because I don't have an exact to go off. I don't have a dyno sheet. I don't know what gears you have, what exact clutch, what elevation, the Wieght of the truck etc.

Unless you provide every aspect possible no one can give you exact combos like you are wanting because a certain setup isn't one size fits all.

oldestof11 · 10-12-2012, 12:56 PM

Don't forget ambient temp, track temp, track prep... All that goes into out too.

OP, you need to just go out and do it.

Sent from my DROID RAZR using Tapatalk 2

ChuMaDD · 10-12-2012, 04:30 PM

Try doing something 1st than post your results with what you did and how well it worked...

skubasteve · 10-26-2012, 05:24 PM

Quote:

Originally Posted by Gibson

That's kind of hard to give. Unless we know ever aspect of your truck. Other than 'QCSB 2wd 6sp'. I couldn't tell you an exact because I don't have an exact to go off. I don't have a dyno sheet. I don't know what gears you have, what exact clutch, what elevation, the Wieght of the truck etc.

Unless you provide every aspect possible no one can give you exact combos like you are wanting because a certain setup isn't one size fits all.

I don't have the sheet in front of me but i peak at 616rwhp @ 40psi on dyno (peaks 50-55 on street) power curve is not that great because of the big single, it really starts to light at 2k and runs out of juice at 3600-3800. weighs 7260 with me and some tools. 3.73 gears, street 31.75" tall tires 14" wide on 20" rims. single ceramic organic clutch w/ 3600lb pressure plate. track is 600 above sea level. san antonio raceway

Quote:

Originally Posted by ChuMaDD

Try doing something 1st than post your results with what you did and how well it worked...

i ran the truck when it still had some power issues, 400-450rwhp, 20psi in the tires, took off in 2nd and was really hard to get traction then i got lots of hop, 3rd had lots of wheel hop as well and 4th was good. ran a 15.2 @94.8 cant remember the 60ft but it was bad. but turns out RP wasn't going above 10-12k @ wot

im working on fabbing up some ladder bars and then going to hit the track, ill prob drop the pressure down to 15psi and see how it runs. have any of you put weight over the axles??? or would i just be shooting myself in the foot with more weight

thanks for the input

Gibson · 10-26-2012, 05:50 PM

That single disc clutch is going to kill your launch a bit but your on the right track (no pun intended). Ladder bars will help out. And some weight over the axle will help you hook. You say you have street tires? What ply? Maybe get some cheap steel/aluminum rims and some drag radials just for the strip? These 2wd's are a BIATCH to make hook on the track. I don't even bother trying to punch it any more in my 2wd's since I do nothing but spin spin spin.

On a side note tho.
I would use 3rd gear 2-2300rpm 15psi boost should be about that. With ladder bars. Maybe 2-300# in the bed. And some sticky 8ply tires at 25psi. That is what got my 2wd dually from spinning. But I was a bit lower in the HP and charger size than you. And I had a dual disk.

Hurley · 10-26-2012, 06:30 PM

600HP Cummins Powered Truck - Drag Race - YouTube

old school

10-08-2012, 12:11 AM	#1
skubasteve Name: skubasteve Title: Rookie Status: Not Here Join Date: Sep 2012 Member`s Gallery Posts: 7	2wd launch tips just like the title says.... been to the strip once so far and having a hard time getting traction. wondering if y'all have any tricks for launching. I have a QCLB 2wd. __________________ 04.0 Cummins 2wd leveled on 20's, strait 4" inch, holly black w/ push lok, smarty TNT-r, silver66, DDP 90's, ARP 425's, Hamilton 188/220, 6 spd, Tennessee clutch, DIY cp3, DIY PVC intake with trash can ram air and some guages.... B4 cam- 616 dynojet (non-loading)

10-08-2012, 01:32 AM	#2
SPEEDSHIFT Name: SPEEDSHIFT Title: Too Much Time Status: Not Here Join Date: Jan 2007 Location: San Antonio, TX Member`s Gallery Posts: 5,978	............ __________________ @bodie_armstrong 2003 2500 4x4 auto FOR SALE 2005 2500 4x4 auto Drag Truck 2013 3500 4x4 Aisin Dually Tow Rig Tenacity Tuning, Longs Machine Shop, BD Diesel Performance

10-08-2012, 01:32 AM	#3
SPEEDSHIFT Name: SPEEDSHIFT Title: Too Much Time Status: Not Here Join Date: Jan 2007 Location: San Antonio, TX Member`s Gallery Posts: 5,978	slicks + Caltracs __________________ @bodie_armstrong 2003 2500 4x4 auto FOR SALE 2005 2500 4x4 auto Drag Truck 2013 3500 4x4 Aisin Dually Tow Rig Tenacity Tuning, Longs Machine Shop, BD Diesel Performance

10-08-2012, 07:52 AM	#5
DirtyMaxx03 Name: DirtyMaxx03 Title: Too Much Time Status: Not Here Join Date: May 2011 Location: San Antonio, TX Member`s Gallery Posts: 2,862	Practice....a lot. __________________ Sean Stock 2005 LLY

10-08-2012, 01:59 PM	#6
Gibson Name: Gibson Title: There's no love in diesel Status: Not Here Join Date: Oct 2008 Location: Gonzales, Texas Member`s Gallery Posts: 4,076	Soft sticky tires __________________ all my trucks are broke down 2003 Dodge 2500 Cummins QC SRW

10-08-2012, 02:15 PM	#7
Hurley Name: Hurley Title: BLAKLUNG Status: Not Here Join Date: Apr 2008 Location: Statesville, NC Member`s Gallery Posts: 3,698	start in 4th (all reasonable responses have been posted) __________________ THIS IS COMPD. 95 2500 RCSB 2wd back-halfed and 4-linked 5x14/7mm +100cc/4k/11-blade billet 63/68/.91 T4 539/989 03 RCLB 4x4, SSR

10-08-2012, 02:21 PM	#8
TMONEYDIESEL Name: TMONEYDIESEL Title: Comp Diesel Sponsor Status: Not Here Join Date: Jan 2007 Member`s Gallery Posts: 8,706	Manual or auto? __________________ MANNING MOTORSPORTS Office +1 (512) 217-7644 YOUR SOURCE FOR: Camshafts Pushrods Valve springs Custom Turbos Exhaust Manifolds Carrillo Connecting rods

10-08-2012, 02:29 PM	#9
RacinDuallie Name: RacinDuallie Title: Black Sheep Racing Status: Not Here Join Date: Apr 2006 Location: Supporting Northeast Diesel Racing Member`s Gallery Posts: 17,369	__________________

10-11-2012, 10:10 PM	#10
skubasteve Name: skubasteve Title: Rookie Status: Not Here Join Date: Sep 2012 Member`s Gallery Posts: 7	Manual 6 speed, clutch isn't strong enough for 3rd gear launch let alone 4th gear lol Was thinking of gettin some large diameter DR and fabbing up some removable traction/ladder bars. But then again if I go with a smaller drag radial I could probly take off in 3rd.... Hmmm Any cool threads for homemade traction bars? Nice to see where people are mounting them before I start measuring/fabbing __________________ 04.0 Cummins 2wd leveled on 20's, strait 4" inch, holly black w/ push lok, smarty TNT-r, silver66, DDP 90's, ARP 425's, Hamilton 188/220, 6 spd, Tennessee clutch, DIY cp3, DIY PVC intake with trash can ram air and some guages.... B4 cam- 616 dynojet (non-loading)

10-11-2012, 10:45 PM	#11
Gibson Name: Gibson Title: There's no love in diesel Status: Not Here Join Date: Oct 2008 Location: Gonzales, Texas Member`s Gallery Posts: 4,076	Not many ways to mount traction bars. One end on the axle. Other end where the drive shaft flexes on the frame, to be simple. But maybe you should get a stouter clutch and stickier tires or softer suspension __________________ all my trucks are broke down 2003 Dodge 2500 Cummins QC SRW

10-11-2012, 10:55 PM	#12
diesel_importer Name: diesel_importer Title: Too Much Time Status: Not Here Join Date: Oct 2007 Location: Fairfield,TX Member`s Gallery Posts: 4,501	Auto 2wd is hard enough in these nose heavy trucks..... __________________ 01 QCSB 2WD AUTO: Redline/Smarty, Monster VP, 6x.013, S467 FMW, Goerend Trans, Caltracs. Fuel only - 11.85 @ 114, 50 Shot - 11.58 @ 116 w/ 1.69 60'

10-12-2012, 08:10 AM	#14
dangerous06 Name: dangerous06 Title: diesel tech Status: Not Here Join Date: Mar 2008 Location: Escondido CA Member`s Gallery Posts: 3,564	500lbs in the bed works well! 17 x 12 rim with a drag slick. Check Jegs for tires! __________________ E.D. 66-74-091, T-4 exhaust, 2 Micron filter pre CP3, EFI, S&B intake, ARP 625 head studs, 182-214 Hamilton Cam,springs and push rods,40% injectors, Banks Intercooler, T&C CP-3 & PRV, Built 48RE, 5" exhaust,Carrillo rods, Pacbrake!

10-12-2012, 12:56 PM	#16
oldestof11 Name: oldestof11 Title: Drag racer Status: Not Here Join Date: Jul 2007 Location: Dixon, IL Member`s Gallery Posts: 9,084	Don't forget ambient temp, track temp, track prep... All that goes into out too. OP, you need to just go out and do it. Sent from my DROID RAZR using Tapatalk 2 __________________ Jon

10-26-2012, 05:50 PM	#19
Gibson Name: Gibson Title: There's no love in diesel Status: Not Here Join Date: Oct 2008 Location: Gonzales, Texas Member`s Gallery Posts: 4,076	That single disc clutch is going to kill your launch a bit but your on the right track (no pun intended). Ladder bars will help out. And some weight over the axle will help you hook. You say you have street tires? What ply? Maybe get some cheap steel/aluminum rims and some drag radials just for the strip? These 2wd's are a BIATCH to make hook on the track. I don't even bother trying to punch it any more in my 2wd's since I do nothing but spin spin spin. On a side note tho. I would use 3rd gear 2-2300rpm 15psi boost should be about that. With ladder bars. Maybe 2-300# in the bed. And some sticky 8ply tires at 25psi. That is what got my 2wd dually from spinning. But I was a bit lower in the HP and charger size than you. And I had a dual disk. __________________ all my trucks are broke down 2003 Dodge 2500 Cummins QC SRW

10-26-2012, 06:30 PM	#20
Hurley Name: Hurley Title: BLAKLUNG Status: Not Here Join Date: Apr 2008 Location: Statesville, NC Member`s Gallery Posts: 3,698	600HP Cummins Powered Truck - Drag Race - YouTube old school __________________ THIS IS COMPD. 95 2500 RCSB 2wd back-halfed and 4-linked 5x14/7mm +100cc/4k/11-blade billet 63/68/.91 T4 539/989 03 RCLB 4x4, SSR