My new drag toy. 93 lx coupe carbed LS1/th400. (pics) by JRracing

5 minute(s) of a 190 minute read

tire clearance after body work.

Carpet and rear seat deleat.

4-11-2009

I got the car scaled today. That was cool, I learned a lot of things. It weighs 2630lbs with out me and 6 gallons of fuel. With me and a helmet and work clothes and boots it was 2820lbs.
The frt to Rr disbursement was 55%frt and 44%Rr. If the motor was 2" back were it should be it would be right on target. Lt to Rt was 13lbs heavier on the right.
We went over the whole chassis front to rear checking things and making adjustments. We set the pinion at -2. He said there did not look like there would not be any bump steer. We also centered the rear end.

I feel a bit safer taking it to the track now that I have that done by a chassis guy. And I'm happy to see it weigh what I thought it would. I was shooting for 2600lbs.

We are taking it to the dyno tomorrow for some fine tuning on the rollers. Stay tuned...

4-12-2009

We went to the dyno yesterday and I was not pleased with the out come. First of all we were the last one to get on it. So it was 5:30 by the time we got on it. The car started out very lean with the 5.5pv, 75frt/87Rr jets. We went up 5 on both, it was still lean. Went up 5 more and it was rich. Dropped it 2 sizes and it was rich again. Went up 1 and it was lean.
We could not get it just right. The guy at the dyno shop said every demon he has seen was junk. They could never get them just right. He suggested switching the carb to something else.
We bumped the timing 2 deg at a time until it lost power. We ended up with 32 total.
My wideband was not reading the same as his. So I pulled my sensor and put on of his in there and hooked it to his pc on the dyno.

The end result was 420ish hp and 400ish tq. It was late and I forgot to get the graph. I made about 8 pulls between all the jet changes. We ended up with 85frt/96Rr jets and she is a little rich running in the 11.8:1 range. But with one size lower jets it would run around 13.5 to 13.8:1 and lost about 50hp.

Over all I was not impressed. I either need to find someone who can help me get this carb right or I need to get a diff carb.

The car pulls really hard on the street and revs quickly.

4-13-2009

I just got off of Quick fuels web site and Pro systems. They look like some nice carbs. I'm gonna do a little digging around to see what I can find. Also I'm going to call both company's tomorrow and talk with them a little bit to feel them out and see what they recommend for my setup.

I found a guy on corral who has a quick fuel 850 for $350 but it has vacume secondarines. how hard and $ would it cost to switch it to mech secondaries?

That buddies of mine was going to come over today but could not make it here. He is going to bring that quick fuel over tomorrow.

4-16-2009

Boy's she is fast... I took it to the track tonight for some base line runs and to get the susp figured out.

I started out running 1/8 mile the first few passes. Foot braking it.

60' 330' 1/8
1st run 1.48 4.30 [email protected]
2nd run 1.92 4.78 [email protected] junk run
3rd run 1.44 4.27 [email protected] costing to a [email protected]

So once I knew she would go staight and make it all the way down the track I figured it was time to run it out the back door. And it was time to see what the trans brake would feel like. I set the 2 step at 3000 and let'r eat.

The run went like this.
1.41 60'
4.19 330'
[email protected] 1/8
[email protected]

850 DA.
I was more than happy with that for a first time out/base line.

The car drove straight as a pin. From 60' on out it was like driving my silverado lol. It was very easy to drive and predictable. The A/F was at 11.0 at the traps. that is if it is reading correctly. We were showing a differance on the dyno with his wide band. I never pulled a plug to verify at the end of the track. I will next time.