The Mark at the Track on Street Tires!

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mlschultz

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I drove the Mark 150 miles one way to Silver Dollar Raceway outside of Reynolds, GA yesterday, to see what the Mark will do with the 285 Toyo Proxes T1R street tires.

I let it cool down for about 45 minutes after the drive, and now I think I might let it cool down a little longer next time. The temp gauge was in between cold and where it normally sits when warmed up, but the Vortech was not cooled off yet.

First run: I just did a dry burnout - no smoke show, more like clean off the tires, and launched off idle rolling my foot into it. It hooked after a little spin with a 1.8 60'. I left a blow-off valve O-ring on the starting line :cool: so there is some air bleeding off until I put the ring back in. That short time is actually a better 60 than with the steel rim inner tube M/T ET Streets I had on the car last November at SSHS8.

The car still needs some transmission tuning, and the torque converter is locking up around the 1000' mark. The car felt flat, like timing was being pulled. Air temps in the car showed in the upper 60's outside. Ran 12.415@115.21

Second run: Cool down was a hour and a half. Same burnout as the first run. This time, I stalled the converter to just under 2000rpm, and tried to roll into it since I hooked on the first run. Well, that didn't work :) . All hell broke loose. I went all through 1st and 2nd gear sideways John Force style bouncing off the rev limiter the entire way lol :) .

lol The poor kid driving the bright lime green 340 Duster next to me sure did see a show. In fact, he pulled me by 2 cars by the 1/8th mile while I was melting the tires. By the 1000' mark, we were even, and by the stripe, I had him by 3 cars. He ran a 14.261@97.77 to my 13.933@113.16. :)

lol Guys came out of the stands to give me props after that show. :)

I need to pick up another set of drag radials for the new rims. I had a lot of fun just driving up and racing without having to swap tires. I went by myself, so there are no pictures or videos this time. Just the time slips below.

The one on the left is from last November with the steel rims and inner tube MT ET Streets to compare against the 2 runs on street tires for the middle and right slips.

The left slip is with Aric's S-trim with a 2.7 pulley, and the middle and right slip are with my new T-trim with a 3.33 pulley. Also, outside air temp for the left slip was in the 30's, and the middle and right slips air temp was in the 60's.



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lol Not sure what happened there JP. :) The file is titled: "February 7, 2009" Put that in the search field and it should bring it up.
 
Thanks, Guys :) I plan to run the 285 street tires for a while now, until I score a new set of DR's to run on the car full time. Fun Ford is the end of next month at Atl Dragway, and I will probably run true street and see what happens. :)

I am learning very quick, that a much softer launch off idle is needed with the street tires. :cool:
 
Thanks Everyone :) I need to talk over with Aric and see what he thinks about hot lapping the car in True Street. I don't think he is going to like the idea too much. So, I might just do one of the brackets instead.
 
Of course my car is not supercharged, so it probably does not build up as much ambient heat as yours does, but I absolutely refuse to run mine more than once every 90 minutes.

I have on the order of.... 700 or so timeslips and I can show you time and time again that engine heat saturation will take anywhere from 1 to 3 tenths of a second off my 1/4 mile time. I would have to imagine that your engine will respond in a similar way.

I purchased an A/C inverter that plugs into a cigarette lighter socket and an adapter that lets me attach a cigarette lighter plug straight onto my battery. I plug the A/C inverter into that, then I have a 20" box fan that I just lay on top of the motor and let it run while I am waiting around.

It seemed kind of silly when I first started doing it and I got a lot of curious looks, but last year one of the DSM guys was complaining about the heat and I let him borrow my setup between one of his runs... the next thing I knew fans were popping up all over the place.

I digress! Anyway, cool that motor down! And those are awesome runs on both streets and DRs. I am envious.
 
mlschultz said:
I need to talk over with Aric and see what he thinks about hot lapping the car in True Street. I don't think he is going to like the idea too much.
Click to expand...

Why? You only have to go 3 rounds. ;)

Devin said:
but I absolutely refuse to run mine more than once every 90 minutes.

I have on the order of.... 700 or so timeslips and I can show you time and time again that engine heat saturation will take anywhere from 1 to 3 tenths of a second off my 1/4 mile time.
Click to expand...

90 minutes! :eek:

I can show you many timeslips hotlapping 3 to 7 minutes apart holding remarkably consistent ETs. While it is true most best ETs are usually after an adequate cooldown, I have found 45 minutes to be an optimum cooldown period for my '93. I have actually purposedly built up heat in the staging lanes when the cooldown time is too long.

I learned early on the effects of heat soak and equipped the '93 with a cooling fan bypass. Props to your ingenuity with the fan at the track. ;)
 
Yeah, well, I am Mr. Conservative about everything. And I'd probably get consistent times making quick passes, too... I was just saying that they'd be a bit slower than my fastest times. I guess I'm a wimp, though, I hate to hot lap.

I would have run a bypass for the radiator fan but doesn't that thing draw like 90 amps or something crazy like that?

Edit: I was wrong, I have about 400 slips, not 700.
 
I can see getting away with hot lapping a NA car vs one with a power adder. I am sure it could do it, but I am not willing to risk blowing the motor up for Fun Ford if Aric says it is a bad idea. :)
 
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