Estimate my 1/4-mile time!::: (also, what's next)

[KrisR]

I've done some searching, but I haven't found anyone with my exact combo. I'll find out in the spring, but I've got lots of friends wondering! Any help is appreciated.

'86 GN, 93k miles. Stock: turbo, IC, exhaust manifolds, rebuilt stock posi with factory gears.

36-lb bluetop injectors, Terry Houston 3" dp with dump, Walbro 340 hotwired, billet adjustable FPR, adjustable wastegate rod, Turbo Tweak 93-octane chip, Scanmaster, lightweight Centerline Telstar wheels (15x6 front with 205/70-15s, 15x8 rear with G60-15 McCreary dirt cheater slicks, like Sportsman Pros), Hooker exhaust, Red Stripe 2500 lockup torque converter, rebuilt 200-4R transmission with shift kit. I think that's it. 93 octane fuel, about 18 psi boost, until I get a race chip. Assume decent track conditions and air.

Estimates? ***EDIT: I'd also like to know approx trap speed....

Also, what should be my next mod(s) (besides race fuel/chip/more boost)? Turbo upgrade? IC upgrade? Need to know what the 'next step' should be.

Thanks,
Kris

 

[ES1]

13.5-13.2
Becareful running 18psi with 93 octane through the 1/4 (knock)
If you were to run some xylene mix you might bust a high 12 if you could get a good 60 ft.
Do you have a knock guage or scanmaster?

Upgrades
alky system
Large neck innercooler
box lower control arms

 

[KrisR]

Originally posted by ES1

Do you have a knock guage or scanmaster?

My Scanmaster is listed above. I haven't used it yet - the car is parked. If I can't get away with 18psi, I'll run 17 or 16 or whatever.

Thanks,
Kris

 

[UNGN]

It'll be tough running much faster than 103-104 without knock unless you add some octane.

 

[ES1]

103-105mph
The key to going fast is a good 60ft

 

[ES1]

Look at UNGN's time slips.
It is very good information.
You also need to read about his launch technique.

 

[jetmech]

ive got about your exact combo. my times are in my sig. with about 21 psi. on 110 octane
and thrasher 108 chip

 

[KrisR]

Thanks jetmech! Very useful.

So it sounds like to run anywhere in the 12s I will need:

a) Alky setup (not my 1st choice)

or b) Race chip and race fuel and lotsa boost (crappy on the street though - $5.99/gal fuel is no fun)

Trouble is, I spend a lot of time on a local Mustang/F-body site and I want to run the bolt-on LS1/pre-03 Cobra guys, who run 13-flat at 107-108 all day. I will have the time, but not the mph to beat them from a roll.

Eh. We'll see. Keep the info coming!

Thanks again,
Kris

 

[UNGN]

It doesn't take a lot of race gas to run 107-108, it just takes some to stave off the knock on the 2-3 shift.

Two to three gallons of leaded 116 to a tank of 93 with a good 100 octane chip and 18 psi of booost should allow easy 108 mph 1/4 mile speeds.