4wd dragrace

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4wd dragrace

Postby lopez dodge » Wed Nov 10, 2010 7:30 am

thinking of going to run the truck this weekend , so I particed a few lauches lastnight .Problem is there seems to be a fine line between bogging the truck off the line and melting the tires through 2nd and 3rd, was thinking of leaving in 4wd but am a little chicken about it . anythoughts?
1991.5 ..getrag super40. 40,horse injectors,4"to 6" exhaust , bhaf 2nd gen intake,custom pin timed to the head ..1/4 14.9@93mph 5,500' with a little propane
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Re: 4wd dragrace

Postby KTA » Wed Nov 10, 2010 9:31 am

Run it in 4hi it will hook a lot better.
Fleet of Junk: 1989 D350 627rwhp 1300 tq B-1/Hx60 twins, KTA pump/injectors, ported head, BIG fuel supply. 13.75@ 109.5mph 1/4: 1992 W350 Cab-chasis, 1993 W350 ext cab cust.370 inj Hx40/16cm 290rwhp hydroboost brakes,1984 D350 crew-cab another project.
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Re: 4wd dragrace

Postby lopez dodge » Wed Nov 10, 2010 9:39 am

the np205 in our trucks wont have a problem running that fast?
1991.5 ..getrag super40. 40,horse injectors,4"to 6" exhaust , bhaf 2nd gen intake,custom pin timed to the head ..1/4 14.9@93mph 5,500' with a little propane
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Re: 4wd dragrace

Postby 1STGENFARMBOY » Wed Nov 10, 2010 10:02 am

some guys on this site say they have ran 130 in 4 hi, and alot of them drag race all the time.
93 W250 STD CAB, AUTO 3.55, GAUGES, 80HP DDP STICKS, DENNY T ,16CM HOUSING, 60MM GILLETT, VE MAXED,BHAF, BHFF, 366 SPRING,P/S INTERCOOLER, TIMS COOLER TUBS, TIMMING 1/8 BUMP,4in TURBO BACK TO DUEL 5IN STACKS,33 12.50 BFG, HOLLEY BLACK, CONVERTER COOMING.
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Re: 4wd dragrace

Postby Richie O » Wed Nov 10, 2010 10:17 am

Is it good for it? No
Do I do it? Yes
Do I really care? No
:D
1989 W250 727, 3.07 L/S, S300, P/S Intercooler, Stans exaust, Pump adjustments, 127k miles,297 hp
1993 W250 extended cab, rag, 4.10 l/s, 6x16's, HTT 62/71/14 piston l/p, Isspro EV series tach, fuel pressure, boost, oil pres, water temp, volt, pryo, 132k/ 301 hp
1992 W250 with NV4500, 3.54's, 16cm 60mm GDS H1C, ground stock cone, Isspro tach, pryo, boost, fuel pressure, slow, rusty, dented,180k
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Re: 4wd dragrace

Postby BC847 » Wed Nov 10, 2010 2:02 pm

Make the full pass in 4WD. Once you get past the finish line, slow to say, 70mph and shift back to 2WD. ;)
David

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Re: 4wd dragrace

Postby lopez dodge » Wed Nov 10, 2010 3:18 pm

I won't be anywhere near that fast I think I will just run it 4hi.
thanks for the input
1991.5 ..getrag super40. 40,horse injectors,4"to 6" exhaust , bhaf 2nd gen intake,custom pin timed to the head ..1/4 14.9@93mph 5,500' with a little propane
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Re: 4wd dragrace

Postby Tacoclaw » Thu Nov 11, 2010 9:14 pm

While I'm not sure if you have a manual or not, and I'm assuming yes due to the bogging comment, you may want to be pretty gentle on your first few runs. My front axle was walking down the track one side in front of the other during launches. The guy that stands at the tree was actually ducking away from my truck during my 2nd and 3rd launches. :lol:

It probably won't be an issue if you're able to slip your clutch a bit, but I was completely unable to modulate my pedal enough to attempt to slip mine, so I had a full engagement at whatever RPM I was launching at. It would put me back in the seat just enough when it started rolling that I couldn't keep the fine control.

Damn being short...

On a side note, if you do have an auto, I'd launch it's brains out in 4WD and never think twice about it.

Also, if you do get any accidentally nasty 4WD launches, go back in the pits and check your front U-joint straps. Mine were finger tight after just 2 launches.
1990 W250 4x4
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Re: 4wd dragrace

Postby lopez dodge » Fri Nov 12, 2010 7:30 am

yeah it's a getrag I think I will probly start off pretty easy till I get a feel for how it's going to react. thanks for reminding me about the front u joint .
1991.5 ..getrag super40. 40,horse injectors,4"to 6" exhaust , bhaf 2nd gen intake,custom pin timed to the head ..1/4 14.9@93mph 5,500' with a little propane
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Re: 4wd dragrace

Postby GLHS » Fri Nov 12, 2010 10:33 pm

If it's your first time I would recommend about 2000 rpm and riding the clutch for no more than a second and a half.
A quick and steady release is better than a hard pop.

Two seconds or more of riding it and you will start to smoke the clutch.
92 W250 ext cab, 5spd, SPS 62/71/14, ATS 3 piece, Banks 3G intake, Icebox CAI, DDP #4+, timing 1.95 mm, SB 4 puck FE, PDR fuel pin, Hellmann intercooler, Snow water/meth, 60# springs, stock long block, D80 3.54 w/disks, 455+/1005 uncorrected, 13.34@102 7-06; 472 fuel/520 water/meth uncorrected 5-08
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Re: 4wd dragrace

Postby lopez dodge » Mon Nov 15, 2010 7:26 am

well went to the track sat. my best was 16.01 @88 :evil: . last run started off feeling like a 15 but clutch started slipping in 3rd so i lifted (this is my dd). but I had a blast. could use more fuel on the top end though, will definatly be going back next summer.
1991.5 ..getrag super40. 40,horse injectors,4"to 6" exhaust , bhaf 2nd gen intake,custom pin timed to the head ..1/4 14.9@93mph 5,500' with a little propane
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Re: 4wd dragrace

Postby oldestof11 » Mon Nov 15, 2010 4:43 pm

To give perspective,

I am a 2wd, stock trans and converter 1st Gen. Meaning, lightweight and high stall. Now, I have 40-60hp equivalent injectors, stock turbo, no timing bump. I have fuel pressure at 16psi PRE-FILTER and KSB hotwired. I netted 16.18 as a best. With your turbo and 4wd, I think even being a G360, I think 15.5's is possible...
Jon
93 D250~ Mismatch of cheap parts, trying to look fast going slow
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Re: 4wd dragrace

Postby lopez dodge » Tue Nov 16, 2010 7:34 am

I forgot to mention i am running a 35" tire on steel 3rd gen wheels , with a smaller tire I think I would have been well into the 15's
1991.5 ..getrag super40. 40,horse injectors,4"to 6" exhaust , bhaf 2nd gen intake,custom pin timed to the head ..1/4 14.9@93mph 5,500' with a little propane
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