021le

2002 NBM 1le z28 a4
hardtop 26k+ miles

Here are the current mods.

Yank 4400 RPM stall converter
trans cooler
HD2 shift kit
233/236 custom cam
upgrade springs/push rods
aftermarket oil pump
custom dyno tune (429hp MD Dyno)
Hooker long tube headers
Underdrive crank pulley
egr/air delete
MSD wires
Becool Radiator 160 stat
Intake lid with K&N air filter
Lanes true dual 3in exhaust with twister mufflers
Dr. Gas X pipe
Auburn locking rear end with 4:10 Richmond gears T/A cover
QA1R front coil over 275# springs
removed front sway bar
Pa racing turbo k-member
QA1 rear shocks
Drag bags in rear springs
MWC front and rear bumper supports
removed rear seat and belts
Subframe connectors
weld rt-s 15/10 with 275/50-15 MT drag radials rear
weld rt-s 17/4.5 with m&h radials up front

anything not listed is how it came from the factory

3450# race weight


Best time so far. Shooting for that 10.99 pass

11:00 pm
temperature = 86f
45%humidity
29.92 in pressure

DA=+2594 ft
Relative Density: 92.63 %


1.5124 60ft
7.0315 1/8th
96.32 mph
11.0646 et
120.74 mph

tires set at 18 psi. 2nd gear burnout.




that is my previous best

new mods are:

MWC FAB 9" with spool and 3.89 gears
MWC short torque arm
FLT stage 4 4l60e
circle d 4C convertor
+50# race weight=3500#


8:00 pm
temperature = 86f
61%humidity
29.91 in pressure

DA=+2692 ft
Relative Density: 92.36 %


1.6528 60ft
7.4188 1/8th
92.02 mph
11.6239 et
116.01 mph

As you can see i am 4mph down in the 1/8th and and almost 5 mph in the 1/4, and 6 tenths slower

Can only stall the circle d to maybe 2500, flashed at 3,500 showing on hp tuners data log.

Really loved the Yank, as you just leave off idle, it was a beast!
The Circle D, you cant leave off idle, have to stall the **** out of it and it does nothing. ;( Don't see how it can lose so much ET and mph. did not realize you have to foot brake the circle D so hard to get it to leave, and leaves so soft, no matter what i tried

is it a huge difference from the 4.10 to 3.89 gears E.T. wise?

Purchase the circle D for future mods of going with a 150 shot. Would like to get my 10.99 all motor. Did not realize that a convertor that can be sprayed on would slow me down so much.

any thoughts or input greatly appreciated.

BOLO

iTrader: (40)

You will need that 4400 stall for best all motor et.
You can't have it both, you can only spray so much for that stall. The same with gearing.

021le

Does going from the 4.10 gears to 3.89 gears effect it much.

say if I put the old converter back in, and kept the 3.89 gears.

T6Rocket

That small of a gearing change should not affect it too much, but the fact it's a heavier 9" with spool may add a little also.

Al

BlkLT1Z281

iTrader: (1)

Not trying to be a dick or sound condescending...but you gained weight, tightened the converter and put a rear in that takes more power to turn. What did you expect to happen? You basically set the drivetrain up for that 150 shot and your NA passes took the hit, which we be expected. You could put the old converter back in and it will help but you still have the other two strikes with the weight and 9" (don't get me wrong, 9" was a smart move). But if you sprayed your old converter you'd more than likely blow through it. But you could always give it a try.

There is a 1st gen big tire camaro around here, runs in the low 7's with a 632 with 3 kits on it...same setup on motor, no nitrous he runs consistent 10.0's. Converter is way too tight and the car leaves lazy. Little extreme but you get the idea.

B18B1LS1

iTrader: (12)

I used to spray 150 on my Yank TP4400 with 4.30 gears. It wasn't ideal but worked pretty well.

021le

Well, ordered a Yank pt4400

I will put the Circle D to good use in the wife's trailblazer SS.

Really want to get that 10.99 N/A pass

346only

I would've called r&r and got one specd for the car. We have very similar mods and my "nitrous" converter has gone 6.7x @105 on motor. It will get hit with a 200 shot the next pass at the track and work my way to a 300 shot. I also have an 8.8 rear that don't eat up much power. Your cam is bigger but I do have a set of ported 5.3 heads but we're nowhere near close on et or trap speed.

1970camaroRS

iTrader: (8)

It doesn't add up. The gearing change won't change your ET much, maybe a slightly slower 60', but it won't bring your MPH down. If anything, it would add to your trap slightly. The stall will kill your 60' a bit, and it did. 1.65 is still pretty good. But, .15 in your 60' isn't going to be .6 in your 1/4 ET at your power level. The 50lb weight gain is going to take out .05 in your ET or so and maybe .5mph. The heavier rear will eat some power, but not 40-50 rwhp that your 5mph drop shows. But, I don't think it's your engine.

Something is wrong with that Circle D 4c. I have one in my car, and I can only foot-brake it to about 2,000rpm, but that's because my tiny stock brakes can't take any more. It flashes to 4,000rpm in 310msec, which is a little slow but mine was spec'd for a heavy hit of nitrous. Yours flashing to 3,500rpm makes me think something is wrong there. Have you called Circle-D? I know you already replaced it, but see what they say. The low flash RPM and the drop in trap MPH is troubling. The ET drop is expected, but excessive.

021le

I am only going 92, was 96 in the 1/8th on old converter.

You are going 9 mph faster in the 1/8th from my old best. Not even close to the same.

What is your setup engine/gear/tires/weight etc..?

346only

346 with ported 5.3's, cam around .600 lift and 230's duration, fast90. R&R converter, and 4.10's. weighs 3300+ without me in it. 27" radials.

021le

We are close to the same race weight. What is your 60ft, 1/4 mile et/mph?

9 mph is a ton just in the eight. like 100 more hp, id have to spray 100 shot to equal your times.

What did your car dyno at?

something is missing for sure.

Can you list a complete list of mods?

sillysspeed

iTrader: (21)

That yank will get the 60ft back down. Should really be in the mid 1.4x maybe lower even. That will knock your et back down and get you a 10 second pass. People probably think I work for Comp but changing to a FAST intake will make a big difference. Also a good ram air if you don't already have one.

346only

60ft is 1.48s. never ran a 1/4. Dynos are garbage, I think it was 420 or so, I didn't even want a sheet.

346only

Yep. Converter and 9" is what slowed it down. A fast will help a little.

B18B1LS1

iTrader: (12)

The mph on your previous bests are down probably 3-4 mph compared to your ET's. Wondering if you might have some other issues too. Maybe the tune needs to be looked at?

sillysspeed

iTrader: (21)

I was expecting the 9" was gonna slow me down but I never saw a difference at the track. FAST would pick him up a couple tenths and couple mph as long as he has a good ram air and maf/speed density

Nostang

iTrader: (4)

FYi. On my old 355 combo I ran 11.44@118.59mph with a 1.579 60FT with 4.11 gears and a 26" tall tire. with a nitrous spec 4200 N/A stall. I changed to a 3.70 gear and slowed to 11.7@116 in similar weather. I then changed to a 28" tall tire and slowed to 11.9@114mph with a 1.71 60ft @ 4200 off the t-brake in similar weather. The car was a dog with the nitrous gearing N/A. It would not even spin on the street from a stop N/A. However, it really woke up on the bottle. Gearing can make a huge difference with a nitrous converter.

021le

Made it back to the track with the new Yank PT4400.

Best pass of the night.

6:00 pm
temperature = 86f
55%humidity
29.95 in pressure

DA=+2614 ft
Relative Density: 92.57 %


1.5486 60ft
7.1818 1/8th
94.10 mph
11.3119 et
117.43 mph

021le

Another trip to the track.

Tires are shot, got some new Hoosier drag radials mounted for next time. It was really humid. Water droplets and condensation all over cars roofs hoods etc.. really bad, and it rained all week prior.

9:00 pm
temperature = 61f
87%humidity
30.27 in pressure

DA=+570 ft
Relative Density: 98.34 %


1.61 60ft
7.21 1/8th
95.24 mph
11.2985 et
118.73 mph