95' Junker Drag Truck

Big Blue24 said:
I did read about Ron's truck making big HP without his booster lift pump.


All I know, is this little 160 pump is hungry for fuel pressure and the more I feed it, the harder it fuels. You have to remember, I have the factory lift system intact and and the pusher pump and front feed pump on separate toggle switches. There is an honest 75-80 HP gain flipping on the pusher pump, especially in the 2600+ rpm range. The front feed Walbro pump doesn't make a noticeable increase in power till about 3200 rpm.


To give a little perspective, on the 11.73 pass, it was running 97.5 MPH in the 1/8th. That kind of trap speed will normally net 126-128 MPH at the 1/4 mile. This truck is defueling, boost falls, smoke clears from a light haze to no visible emissions, and acceleration rate drops dramatically around 1000' out.

126-128 MPH at 5600 lbs calculated to 750-800 HP average to the wheels. Now the actual 119 MPH trap speed calcs to just the mid 640 HP range but I know that the truck is defueling on the second half of the track and falsifying the calculated wheel HP.
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I definitely agree that 160 pumps like more pressure, imo the higher pressures help fill them faster with the slower rate cams.

YOUNG GUNS15 said:
Seems like we are both having problems half track. Your just a full second faster! I took my truck out and just matted it in first and held it there an 3300 is where if falls off real fast. I've been looking at mechanical belt driven setups to solve my issue for good.


Sent from my iPhone during class
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You're 150 should keep up fine with what you have done. They've supported way larger setups.
 
Big Blue24 said:
Yes, this was the first time a real drag slick has been on the Junker Drag Truck. I was blown away by how hard it hooked. The Nascar roadrace slicks felt like they made a nice improvement over street tires, these slicks made a huge improvement over the Nascar slicks.

The biggest seat of the pants difference was down the track on the 1-2, 2-3, and 3-4 gear shifts. I didn't even know the Nascar slicks were spinning a little on these gear shifts till I strapped on these true drag slicks. Every gear shift whacks me in the back so hard, I was amazed that the axles, u-joints, torque converter, and home-built tranny could handle the abuse.

The launch was a little better but I never left hard enough to notice the 100% improvement like I could feel on the gear shifts.

I can't fathom how the aluminum planetary forward gear is still in-tact. The aluminum planetary must be stronger than the common failure pictures would lead you to believe.
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Well if you want a thrill in the sotp listen to my advice, work on that 60', and the gains in sotp will be nill compared to a actual true hard launch! Whether you use a beavis brake, a chisum banger, or a pinion brake figure out a way to come out with 20+ psi and with a good tire and a working suspension. You are making some power now just work on getting it down immediately instead of progressively like a supra.
 
RonA was indeed running a 13mm pump which has so much more fuel to begin with and a quickrate cam as well so it seems like an apples to oranges comparison to me.

However I will say the governors on these trucks have proven to be picky.
 
Here's a side view of the Junker launching on the new drag slicks. Looks like the side walls are working as designed:

106.jpg


Here's a shot of the burnout contest:

695.jpg
 
He needs a grille! Doesn't anybody have one laying around. It doesn't have to be nice cuz its the junker but it would look better LOL
 
Yes I have one to donate, it will not clash with the rest of the truck at all. Will PM me your address if you want it :D
 
Don't worry about the grille, I have an old cracked one off my 98' daily driver that i plan to do a little fiberglass repair work and install it.

I finally want to install a grille because as this truck approaches 120+ MPH, wind resistance will come into play and no-grille = lots of extra wind drag.
 
i dont remember who said it, but the engine compartment is like a parachute, so blocking it off and directing the airflow under the truck would probably help!
 
madmikeismad said:
I was thinking more for safety to prevent lift. And why do people lower trucks and run air dams if not to prevent air from running under the vehicle?

Sent from my DROID3 using Tapatalk
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Yes they lower them and make dams to have less air go under the vehicle. More air under creates more drag.
 
Here's a little Tire Killing Video I made the other night, it's amateur at best:

[ame="http://www.youtube.com/watch?v=9JkG-LmSaiM"]http://www.youtube.com/watch?v=9JkG-LmSaiM[/ame]
 
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