NJFBOA - Home of New Jersey's Camaros and Firebirds - View Single Post - Getting my new 406 SBC installed, running, and driving

IROCZman15 · 10-25-2023, 07:53 AM

I don't remember seeing it happen with the lakewoods but it could still have been happening.

We had to take a rain-date for the dragstrip group rental that was going to be Friday oct 20th, but I still wanted to get some passes on the car that weekend. The track rental is now this coming Friday, so I hopefully can change and adjust whatever I need to in the next two days.

Sunday was a Mopar event that got combined with a Ford event but there was also limited Test and Tune, so I figured I would get 3-4 passes.
Left the Konis on the car and kept the Lakewood rear shocks in the box again. Air bags were set at 6psi (drivers) and 18 psi (pass). Both rear tires were set at 18.6 for the first pass, and both Koni shocks were at setting 2 out of 5. I am experimenting with putting weight in the trunk area also, and it seems to be helping, so thats why my toolbox is in some videos in the trunk.

Pass 1:
All motor pass, and I wanted to experiment and see if I took my WOT timing from 34 deg and dropped it down to 33 deg once I went past the powerband. Did a 4 second burnout. Footbraked to 2910 where it started to creep, and then it flashed to 4610 on the launch. I shifted 1-2 (early) at 5593 and I took second at 6088 and then finish line was 6081 rpms. I was watching gauges too much and later realized i wasn't full WOT the entirety 3rd gear which is the whole back-half of the track, but nonetheless, it was a decent and typical pass for all motor.

Timeslip: (left lane)

Datalog:

All motor launch:

Videos:

https://www.youtube.com/watch?v=MDgAE2ZINH4

https://www.youtube.com/watch?v=SpTPRWjOVWI

Pass 2:
Kept shocks the same and airbags, lowered tire pressure from 18.6 to 18.0 in the back. The nitrous jets are now different in order to try to compensate for the massive extra amount of fuel that this thing somehow needs. It keeps running lean on nitrous, so I have to keep upping fuel in jets and Cl comp. Nitrous jet for my 150 shot is .059 and fuel jet is now a .030 (up from an .030). I have the timing being pulled to 28 degrees on the 150 shotand it has been happy there before. Race gas octane booster added to fuel tank.

Went into the right hand lane. 5 second burnout, footbrake to 2464 rpms and when I launched, it flashed to 5419 rpms. It definitely launched hard and I shifted at 5975 rpms into second and second into 3rd at 6230 rpms. Once I got into 3rd gear it pulled for a bit but then the nitrous went lean again, despite an additional 20% fuel added by CLcomp. It clicked the nitrous off and I finished the run all motor, to go a 10.91; and I actually shifted into 4th gear overdrive to take the load off the motor. So this car goes pig rich in 3rd gear fueling with nitrous on the dyno, but goes dangerously lean on nitrous on the track. wild. The 60 foot and early track was really good though.

Timeslip:

Datalog:

Videos:

https://www.youtube.com/watch?v=7zR-3hbwtEM

https://www.youtube.com/watch?v=V-s5TN0qb3g

https://www.youtube.com/watch?v=i7emRXJZ6nk

Pass3:

Didnt change anything with the tires or shocks or anything. Even went into the same (right) lane. I opened up the Clcomp limits on the higher rpms to be 30%+- instead of 20%+- hoping that would be enough cushion; it wasn't!

Rolled into the throttle a little slower and launched from a lower rpm, 1378. It spun right when the nitrous came on and turned the car a bit to the right, so I had to get out of the throttle and correct it. Shifted out of 1st ger a bit too high at 6589 rpms and then shifted out of 2nd at 6133 rpms. The nitrous went lean again in 3rd gear and thats how my day ended.

Timeslip:

Datalog:

Video: (my buddy John in the left lane)

https://www.youtube.com/watch?v=Ws6t40PiZhw

https://www.youtube.com/watch?v=Mq6Ir0od3t0

So, testing my theory that that slight amount of slip I often feel on the initial launch might be caused by the rim spinning on the tire bead, I decided to mark the tires. The all motor hit (with a 1.52 sixtyfoot) showed a slight move of the paint marks but I didnt get a photo of this. However after the second launch (with a 1.43 sixty foot) I did noticed this amount of movement. Not that its a ton of movement, but now I know why i had to have them re-balanced and I gotta keep this in mind when launching harder.

Drivers side before and after:

[/url]

Pass side before and after:

[/url]

10-25-2023, 07:53 AM	#613
IROCZman15 10 Second Club / Meet Coordinator Join Date: Dec 2004 Location: Roxbury, NJ Posts: 2,101 iTrader: (8)	I don't remember seeing it happen with the lakewoods but it could still have been happening. We had to take a rain-date for the dragstrip group rental that was going to be Friday oct 20th, but I still wanted to get some passes on the car that weekend. The track rental is now this coming Friday, so I hopefully can change and adjust whatever I need to in the next two days. Sunday was a Mopar event that got combined with a Ford event but there was also limited Test and Tune, so I figured I would get 3-4 passes. Left the Konis on the car and kept the Lakewood rear shocks in the box again. Air bags were set at 6psi (drivers) and 18 psi (pass). Both rear tires were set at 18.6 for the first pass, and both Koni shocks were at setting 2 out of 5. I am experimenting with putting weight in the trunk area also, and it seems to be helping, so thats why my toolbox is in some videos in the trunk. Pass 1: All motor pass, and I wanted to experiment and see if I took my WOT timing from 34 deg and dropped it down to 33 deg once I went past the powerband. Did a 4 second burnout. Footbraked to 2910 where it started to creep, and then it flashed to 4610 on the launch. I shifted 1-2 (early) at 5593 and I took second at 6088 and then finish line was 6081 rpms. I was watching gauges too much and later realized i wasn't full WOT the entirety 3rd gear which is the whole back-half of the track, but nonetheless, it was a decent and typical pass for all motor. Timeslip: (left lane) Datalog: All motor launch: Videos: https://www.youtube.com/watch?v=MDgAE2ZINH4 https://www.youtube.com/watch?v=SpTPRWjOVWI Pass 2: Kept shocks the same and airbags, lowered tire pressure from 18.6 to 18.0 in the back. The nitrous jets are now different in order to try to compensate for the massive extra amount of fuel that this thing somehow needs. It keeps running lean on nitrous, so I have to keep upping fuel in jets and Cl comp. Nitrous jet for my 150 shot is .059 and fuel jet is now a .030 (up from an .030). I have the timing being pulled to 28 degrees on the 150 shotand it has been happy there before. Race gas octane booster added to fuel tank. Went into the right hand lane. 5 second burnout, footbrake to 2464 rpms and when I launched, it flashed to 5419 rpms. It definitely launched hard and I shifted at 5975 rpms into second and second into 3rd at 6230 rpms. Once I got into 3rd gear it pulled for a bit but then the nitrous went lean again, despite an additional 20% fuel added by CLcomp. It clicked the nitrous off and I finished the run all motor, to go a 10.91; and I actually shifted into 4th gear overdrive to take the load off the motor. So this car goes pig rich in 3rd gear fueling with nitrous on the dyno, but goes dangerously lean on nitrous on the track. wild. The 60 foot and early track was really good though. Timeslip: Datalog: Videos: https://www.youtube.com/watch?v=7zR-3hbwtEM https://www.youtube.com/watch?v=V-s5TN0qb3g https://www.youtube.com/watch?v=i7emRXJZ6nk Pass3: Didnt change anything with the tires or shocks or anything. Even went into the same (right) lane. I opened up the Clcomp limits on the higher rpms to be 30%+- instead of 20%+- hoping that would be enough cushion; it wasn't! Rolled into the throttle a little slower and launched from a lower rpm, 1378. It spun right when the nitrous came on and turned the car a bit to the right, so I had to get out of the throttle and correct it. Shifted out of 1st ger a bit too high at 6589 rpms and then shifted out of 2nd at 6133 rpms. The nitrous went lean again in 3rd gear and thats how my day ended. Timeslip: Datalog: Video: (my buddy John in the left lane) https://www.youtube.com/watch?v=Ws6t40PiZhw https://www.youtube.com/watch?v=Mq6Ir0od3t0 So, testing my theory that that slight amount of slip I often feel on the initial launch might be caused by the rim spinning on the tire bead, I decided to mark the tires. The all motor hit (with a 1.52 sixtyfoot) showed a slight move of the paint marks but I didnt get a photo of this. However after the second launch (with a 1.43 sixty foot) I did noticed this amount of movement. Not that its a ton of movement, but now I know why i had to have them re-balanced and I gotta keep this in mind when launching harder. Drivers side before and after: [/url] Pass side before and after: [/url] __________________ 1987 IROC-Z - modified Last edited by IROCZman15; 10-26-2023 at 08:42 AM.