brandonppr

iTrader: (9)

I just got my car back together. It made on a Dyno Dynamics dyno 375rwhp on motor and 425rwhp on 75shot.

peaked around 6k.

I haven't ran nitrous in a long time, but last time I did my car was full weight with less done to it on a 3500stall and it ran faster that it does now on spray and at that time it was running 7.6x on motor and was full weight. Is my converter too big?

Time in my sig is from my old H/C setup FYI

1/8th mile

All motor
The car went 7.42@90 with 1.56 60ft

75shot sprayed just after takeoff
went 7.21 @94 with 1.56 60ft

125shot sprayed just after takeoff
went 6.99 @98 with a 1.50 60ft


Here is a little about the car:
98 Camaro <2750lbs A4

Engine 5.7 LS1
Cam: 228/232 .600 112LSA cam
Heads: stock besides valvetrain upgrade
Intake: Fast 90mm
Throttle body: 90mm
!front o2 sensors, !remove rear o2 sensors, !AIR !EGR !EVAP !MAF
Injectors: 60# Siemens
Intake lid
MSD wires
LNC-2000
2nd pump with TPS WOT activation
Plugs: BR7EF
Tune
Speed density
!AIR
!EGR
!VATS
!EVAP
!cats
!rear O2
!IAC
Transmission 4L60e
3800 Yank converter
Rear End Moser
3.73 12 bolt with spool
Nitrous
Fogger wet kit
TPS activation switch
Fuel:E85

The Guy in MY 99TA

sounds pretty good for 1/8th mile. now 1/4 mile it would be obvious you have a problem.

RENE'S RAGE

iTrader: (96)

Your old setup went 7.03, that's pretty damn fast for just h/c.
I don't know much about nitrous, but I think they do like a tighter converter.
Call your converter company and talk to them.
Something is deftly wrong being the converter, tune or...
6,000 is peak power?
What part of TN do you live in?

brandonppr

iTrader: (9)

I'm just south of Nashville. I mostly race at Music City Raceway.

That 7.03 was on a good night. The old set up ranged between 7.0x and 7.2x depending on the weather. The old engine had over 5000 passes before breaking. The last time I had it at the track on the old setup it ran 7.27 with the weather from that day which I think was in July or August. That engine was a forged 347 from LME with TS sg2.5 5.3 heads on a MS4. That set up was still coming up on the dyno at 7k, but I shifted at 6500. It was around 400rwhp at 7k although I never shifted there. Now I am at 425rwhp@6k on a 75 shot, but it only went 7.2x. On motor the 60ft is about the same as I averaged on the old setup.

The old setup was on gas and the new setup is on E85.

if a 75shot got me to 425RWHP then I would think a 125 shot would get me to 460rwhp.

I was hoping to be in the 6's with the 75shot. This car is super light.

The reason I suspect my converter is because I think Yank told me I need to shift at 7k on a 100 shot.

zracer323

iTrader: (12)

Most of your gains with nitrous is at the beginning of the track. How long are you delaying it off the line? If you are only gaining .06 in the 60' then a .45 gain isn't bad.

RENE'S RAGE

iTrader: (96)

Call Josh @ Dynospeed here in Memphis. He is a big nitrous guy.
Sure he can help out.

How did you get you car that light?
My car is 2880 and I don't see much left in it to get as light as yours.

brandonppr

iTrader: (9)

The car pulls the wheels and then sits them right down. I am spraying at pretty much the point that the wheels sit down. I tried spraying off the line and it spun. Might Try again when I get a new set of tires.


I haven't weighed the car yet, but I am guessing it is that weight or lighter by what I have removed. I have done a TON of weight reduction. check my other treads and I listed a lot of stuff to do and I have more ideas that I have not done yet. Here is one thread: https://ls1tech.com/forums/drag-raci...light-car.html

The Guy in MY 99TA

fwiw... if the car really weighs 2750... your times are off pretty bad on motor. The car should run 6's on motor IMO.

Prototype007

iTrader: (2)

The time you knocked off is pretty on par, but you're overall time is a bit slow for that weight IMO.

What was the DA at the time?

p.s. A tighter converter will help your times on the juice!

RENE'S RAGE

iTrader: (96)

I think you really need to weigh the car.
Guessing and actually weighing the car could hurt your feelings.

sweetbmxrider

iTrader: (13)

You picked up 50 hp on a 75 shot?

brandonppr

iTrader: (9)

I know I need to get the car weighed. I want to know what the car weighs for sure. The weight I am guessing is the car by itself w/o driver. I know I have pulled a ton of weight off though and lots of cutting. I did add back some weight with NOS and a moly cage. I also race with a full tank. I have done just about every free weight reduction plus some though.

brandonppr

iTrader: (9)

correct.

The Guy in MY 99TA

to get to that weight you have to get rid of everything inside the car, all the suspension stuff you can buy. You just about have to cut out the front end off, and rear trunk area out.

brandonppr

iTrader: (9)

I don't know what it weighs for sure but why do you all think it is so hard to be under 2800?
This is a race car. I am down to doing things like removing power mirror motors and hole sawing the part that the side mirrors attach to and the steering column is a straight shaft.
If you look around you can find many others under 2800

The Guy in MY 99TA

hmmm yeah you may be right... I really didn't expect it to look like that honestly. From the original post it looked like this was basically a stock car with some stuff taken out.

If the car is that light there is definitely some room for improvement. I'de start by looking at the converter. That's just me. How many miles are on it?

brandonppr

iTrader: (9)

car sees no street miles. Probably has 200 passes on it. Last converter was a 4400 yank and it had probably 2000 passes on it and I had it rebuilt to a 3800 last year when my trans broke. Yank suggested I switch to the 3500 or 3800 if I was going to spray, but that was on the old setup and they suggested shifting at 7k.

TTur1996

If you don't know the weight of the car. How did you order your tourqe converter? They didn't ask you the weight when you ordered it? Did they know you were spraying it? Did they know what HP you would have? Did they know when and how much spray you would using? Are you using a brake? There is alot of factors that need to be known to order the proper tourqe converter.

brandonppr

iTrader: (9)

I took the car back to the track yesterday. I didn't get a chance to spray it and I was at a different track(so I'm not sure it is a fair comparison).
on motor
1.54 7.39 91.4
1.53 7.38 91.0
1.53 7.40 90.8
1.49 7.37 91.0
1.53 7.37 91.3
1.52 7.34 91.4
1.52 7.34 91.3



I bought the converter for my old setup and I was going to spray.
Obviously I was guessing at the weight of the car. I was told to shift at 7k if I was going to spray on the old set up.

The current setup peaks much lower than the old setup. I am now peaking around 6k.