Project JUST-N-SANE hits the TRACK!!

[yody]

Your fuel pump sucks!!! try a different fuel pump!!! before you change the line!!! That would be the first thing i tried...........

[WELTERRACER]

WHy do you say the pump sucks?

[yody]

a mechanical holley street/strip pump probably flows about 100gph. NOt nearly enough for a 650hp supercharged engine.

[blown69nova]

I agree. Too big is better, that's why they make return style regulators!

[my72vette454]

I used an aeromotive a1000 pump and a 13204 regulator on my twin turbo 468 and it works great. I also ran 5/8 pickup and return fuel lines and built a 3 gallon sump in the fuel tank as the aeromotive tech advised. What are your afr's under boost?

Mike

[WELTERRACER]

I have no idea what my AFR's are.... i watch the plugs..

I do have a Air fuel ratio gauge from Autometer but its pretty much worthless!

It is possible the fuel line was heating up,,, because on my 3rd run the car was cooled down for 20 minutes and didnt act up on that run..but the following 4th run it was bad.

[OHCbird]

First off- get a fuel pressure gauge, and watch it on a WFO run. See if and when it fluctuates before going to an uneeded mongo fuel line. Seing as you're looking at running more boost, I'd also invest in a standalone wideband O2; you're engine and wallet will thank you in saved parts & increased performance.

Don't forget to check simple stuff like making sure you're using the properly vented gas cap, etc.

As for slipping the clutch- standby to buy more clutches. Doing that will heat the crap out of them, then you're next few runs will be shiite. I'd say you need to look into tuning the rear suspension, or you'll be stuck around 2.0 60's. Caltracs, anyone?

[WELTERRACER]

I dont slip the clutch... i have to drive it home at the end of the day..

[Ralph LoGrasso]

As for slipping the clutch- standby to buy more clutches. Doing that will heat the crap out of them, then you're next few runs will be shiite. I'd say you need to look into tuning the rear suspension, or you'll be stuck around 2.0 60's. Caltracs, anyone?

With the T56, if you've got a good clutch that can handle the power, there is no problem with slipping it. Slipping the clutch is the absolute best way to launch a 4th gen on street tires. Slipping at 2500 vs. a 2500 dump will result in very different 60' times. This is of course considering you slip the clutch the right way. Maybe some of the 4th gen or T56 guys can back me up (Tony, where ya at?), but pretty much everyone who drag races one will slip the clutch.

[SatisTraction]

but pretty much everyone who drag races one will slip the clutch.

i have never drag raced a 4th gen but with my mustang i do clutch dumps with the pedal mashed to the floor!!! if it dont hook them it is time for more parts!!!

BTW i have 60' times as low as 1.18 seconds

[Ralph LoGrasso]

i have never drag raced a 4th gen but with my mustang i do clutch dumps with the pedal mashed to the floor!!! if it dont hook them it is time for more parts!!!

BTW i have 60' times as low as 1.18 seconds

Dumping the clutch in a 4th gen (this is on street tires, and stock suspension, or near stock, btw) will cause the car to either bog, wheel hop, excessive wheel spin, or a combination of all three (or as a a fourth, break your weak 7.5" 10 bolt, lol). I've experienced this myself. When slipping the clutch properly, you are basically your own traction control. Slip it just enough so you're getting light wheelspin but hooking hard. From a common sense standpoint, you're going to get the best '60 while doing this, rather than dumping and spinning, bogging or hopping to the 60 foot mark. The launch RPM means a lot too. If I dump my clutch at 2500, the car has excessive wheel hop. A 2500 slip nets much better and faster launches.

Nine Ball ran his bone stock '99 SS to a 12.84 ET. One of the fastest ETs for a stock 4th gen I've ever seen, and definitely the fastest for a non '01-'02 car. Launch technique was slip the clutch just right at 2500rpms.

What year is your mustang, and what modifications are done to it?

Keep in mind, I'm not arguing against the clutch dump here. If you've got the suspension and either ET streets or slicks that are going to get you to dead hook, then by all means redline that sucker and dump when the lights go green. If your car will dead hook at a 6k clutch dump, then that's obviously going to get you your best '60. However, in a car that is stock suspended (or not set up for drag racing), with street tires, dumping the clutch is just going to cause you to spin. Slip it to dead hook.

[SatisTraction]

the car is a 91 coupe. it has wofe race craft stock rear suspension, tubular coil over front suspension, wolfe cage, c4 with transbrake launching at 5500rpm on a 250 shot. my old car had the stick.

this years engine was a stock block 418w. I sold that engine today!!! the new combo is a 438 in a 351w dart block block!!! lots of spray!! one fogger kit and one cross bar kit.