New best ET and Mph

William Jones · Posted: Mon May 17, 2010 9:49 pm Post subject: New best ET and Mph

Got the car to the track this weekend for the grudge fest. It was the first time since I made some changes that I got to run the car allout without any weight in it and in the 1/4. It was funny I kept having people ask me if I was spraying it LOL. The track was terrible early in the day so I had to let some air out and soften up the shocks 3 clicks to get it to hook and the density altitude was 2430 ft. Our best run of the day out of 9 passes was.

1.352 60ft
3.878 330ft
6.011 1/8th
115.35 mph
7.863 1000ft
9.444 1/4
141.89 mph

This was at 3040lbs

I left at 5200
shifted at 6800
and crossed at 7650
timing 27 degrees

I am going to drop to a 3.90 from a 4.30 gear next wanting to cross around 7100rpm. Then give it a little more timing. I still haven't messed with the jets and the plugs are pretty dark. I also noticed that with the fans and everything running that I only have 11.6 volts for the 7al3 so looking into putting to 16volt batteries. Can you guys think of anything else to pick it up a little?

Bam

clay · Posted: Mon May 17, 2010 10:45 pm Post subject:

How about just running an alternator? No doubt that would be the first thing I would look at too. Clay

William Jones · Posted: Mon May 17, 2010 11:33 pm Post subject:

I thought about the alt but I want to run a vac pump eventually and with the motor plate I would have to do some thinking outside the box to fit both of them also trying to keep as much weight off the front as possible. Since I never drive this on the street and it is only a track car I thought I could get away with not using one. As long as I went to 2 16V batteries. When I go out to the track almost all the true race cars are running just batteries. Maybe I am going the wrong direction I will give it some thought. As always suggestions and ideas always help in the long run.

Bam

clay · Posted: Mon May 17, 2010 11:43 pm Post subject:

I know we ran a total loss system on our dirt track cars years ago and it was a pain checking batteries, remembering to charge them during the week, running a generetor at the track, hauling a generator, etc. etc. We swore we would never have a car without an alternator again, even if it did cost 5 h.p. to turn (I can't imagine it takes much). I wouldn't say you are going the wrong direction as a lot of cars run total loss (especially since 16V batteries - didn't have them in the dirt track years), the alternator is just what I choose to run. Maybe if the car picks up with the gear change - a slightly tighter converter???? Clay

10sec.et · Posted: Tue May 18, 2010 12:35 am Post subject:

i have a buddy that i race with that thought he didnt want to run an alternator........ turns out that charging thing was more trouble than it was worth. you may not mind but after seeing all the grief this poor guy went through, i will never run without an alternator. one night he never even made a pass because his charger died.

William Jones · Posted: Tue May 18, 2010 12:58 am Post subject:

Good point. When I was running an alt I still had to charge between rounds because I run the fans and water pump to cool down so no matter what I will still need a charger so I can get the car cooled between rounds. I don't see anyway of doing away with the charger. But if it fails it would be nice to be able to atleast make the pass. I talked with a guy at the track who runs to 16v and he told me when they are fully charged he can run all night without charging them. But I don't think he runs as much stuff as I do.

Bam

10sec.et · Posted: Tue May 18, 2010 1:17 am Post subject:

interesting, only reason i have to hook up a charger is to run the nitrous bottle warmer. how big of an alternator do you have ? i used to have the factory (reman) 69 Olds alt and it wouldnt keep up for sh!t. i modified the bracket and started running a high output alt for a late model Chevy and no more charging issues. if you have to custom fab something to mount your alt, then get one for a late model Lincoln such as a Navigator.

William Jones · Posted: Tue May 18, 2010 1:58 am Post subject:

I used to run the 140 amp powermaster and when the car was running we had no problems but between rounds without the charger I had run my batteries dead. Now my routine is shut the car down leave fan and water pump running for 10 min then charge for 5min all at the 50 amp setting I haven't had a problem yet. Just my volatge is low with everything running. I have also run my car around the pits for 30 min without a charge on the 12v batterties.

Bam

Knarley Darley · Member Joined: 22 Apr 2004 Posts: 963 531348.00 points

I only run 1 16 volt battery and just charge between rounds, but have had to hot lap with no problems. It will pick up quite a bit I think with more timing, and dont tighten the converter or it will definitely slow down. The gear change probably wont change anything except the finish line rpm, but the 60' may get hurt a little.

555nova · Posted: Wed Jul 28, 2010 1:04 am Post subject:

I started running 1 battery instead of 2 this year without an alt. I have made it to the finals(6rounds) and so far havent had an issue. I just throw the charger on after every pass as soon as I get to the pits, and leave the fan and pump running for about 5 minutes. I am lucky in the fact that my car is only 180* when I get back and I cool it to about 155*.

I do have a spare fully charged battery that I keep in the trailer just in case and both batteries are cheap walmat deep cells.

Harold Sutton · Posted: Thu Aug 05, 2010 11:13 pm Post subject:

William Jones · Posted: Mon Aug 09, 2010 9:30 pm Post subject:

Yeah I started doing this I wired my charging posts as a 12v hook up. When I come back from a run I turn off the battery diconnect and hook up the 12v charger to my charging posts to cool the motor down. Once its cool I throw 16V charger on just to top off the 16V batteries. When I have to run back to back I use the 16v batteries to cool it down since it runs the fan and water pump faster. It takes about 12min to cool with 12v and 6-7 mins with 16V.

Bam