Slow 5 speed 1/8th mile

[bgilbert]

Well I guess a big single, tons of timing, a getrag 5 speed and a driver that doesn't know how to drag race a 5 speed = SLOW 1/8th mile times:(.

I thought I'd test out the new Pro52 on the 1/8th, bad idea. Best time was 11.92 at 67mph. Worst time was in the 13's, 4 passes all around 66-67mph. All in 2 wheel drive, starting in 2nd gear, ending in 4th. I don't think this truck is or will be the drag racer. 3 of the passes I just got off the clutch at idle. The last one was a 2k rpm side step of the clutch. It just burned the right rear tire for about 60 feet. Nice smoke show though .

I'm told if I knew how to drive a stick and could get on top the charger prior to lauch it might go somewhere. I think I'll just keep this truck the dyno queen and start building the drag truck out of the 91.5.

[90firstgen]

(I realize I might be telling you something you already know) Anyway, I got a tip from a friend once that owns a mopar 4 banger with an HX40 (mopar2ya). He's afraid to use a studder box because coming off the line at x amount of boost is liable to break something. Instead, he revs the engine up and down real fast to get the turbo spinning so there isn't as much spool time. He's not making boost at all like this, but once you take off, the turbo already has some momentum so you don't have to wait as long for boost. I've yet to run on a track, but I plan on doing this because a fast take off much over engine idle speed will burn the tires for me too. I cant imagine having over 400hp. Anywho.... rev that thing up a bunch of times during staging and get that turblow turnin some r's. I think you should be able to do a lot better than that. With my dinkus mods, I should run right around 15 flat in the 1/4 based on other cars I've raced that have been track-timed. (obviously I have a quick spooling turbo etc...) I'm not ignorant

[KTA]

why not lanch in 4wd your front driveshaft shot? Or are ya scared? LOL

[TOMTOM]

Are you leaving the line in 2nd? Wonder if 3rd would quicken it up? (one less slow shift) i went for a ride in travis' dually made a 3rd gear launch, very impressive.
TOMMY

[wannadiesel]

Yeah, if you have the clutch for it a 3rd gear launch will get you going in a hurry. Wind it up to about 2500 RPM, then slip the clutch until you start moving. Once you are rolling fast enough, stomp the skinny pedal and drop the clutch. Takes a little practice and it's rough on the clutch.

[CAJUN 93]

ok tom, no test drives of the white truck for you

daryl

[TOMTOM]

That reminds me you havent had a ride in OLD BLUE. Might be time.
TOMMY

[GLHS]

Bill; a PRO 52? That's pretty big.
My best 1/8 mile times are 8.58 @ 82.5 mph.

[bgilbert]

Yeah Pro52.

KTA, of course I'm scared of that front d-shaft. It's actually in good shape, just I'm scared of it coming apart and taking out the oil pan. Or a front axle u-joint breaking and forcing the truck to an abrupt left or right .

I have a South Bend 13" FE. I remember GLHS saying it wasn't holding up to his drag racing style, so I don't know if it would enjoy a 3rd gear launch.

Thanks for the comments guys, but I think I'll just keep this truck a dyno queen and if the racing bug sticks, I'll build up the auto truck.

[KTA]

Unless your axle shafts are shot you wont break them, the warn aluminum hubs fail first. You might kill a front driveshaft though depending on its angles, but it would do it right at launch, put some good shields on it and hammer it.

[GLHS]

Bill; that's right it won't handle too many hard launches. Keep it below 2,000 rpm and it can do quite a few. I launch at 3,000.
I'm looking into getting some drive shaft loops made for the above reasons.

[bgilbert]

KTA and Kurt, which gear, 2nd or 3rd do you two suggest for a 4wd launch. Will 1500-2000rpm be enough for 3rd gear? Try slipping it like Wanna suggested, get it moving, then dump the clutch and mash the go pedal?

BTW, a local shop with a dynojet is gonna let me run on it as long as I want and make tweaks/adjustments next Friday. So hopefully I can get the timing and fuel screw position set right for maximum Dunbar dyno #'s .

[KTA]

I laiunch 2nd gear at about 1500rpm and slam the clutch so its spins the tires to get up on the charger quick, then when I grab 3rd it hooks.

[CAJUN 93]

I laiunch 2nd gear at about 1500rpm and slam the clutch so its spins the tires to get up on the charger quick, then when I grab 3rd it hooks.

spinning the tires is good as it allows you to build boost but it kills your 60'. thats where that big mph comes in on a mid 13 sec pass. et comes from the first 330 feet (really the first 60'). mph comes from horsepower. i know when i've raced heavy cars in the past (3600-4000 lbs, its all relative) i used a lot of gear to get the tank rolling then rely on rpm to carry the mph. that wont work with these diesels because the don't have the rpm capability to carry the truck on the big end. you'll run out of engine at 800'.

how about a line lock to hold the front wheels to help spooling at the line? slip the clutch in 3rd gear against the line lock then drop and hammer. it would take one hell of a clutch to survive that in a 6000 lb truck

daryl

[KTA]

When my truck was single turbocharged I could consistently run a 2.2 60ft, and that is the best it has ever done. I would just barely stage and then launch early so it would start the timer about the time I hit 3rd.