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Post by stickshifter on Sept 28, 2022 4:12:06 GMT -8
I was looking at Tire Rack but they do not carry any wheels for the Fiat. The bolt pattern is 4 x 98mm which is a bastard pattern. But I did find some on a import sports car site which look good and reasonable price. Since it is rear wheel drive the offset is wrong on most of the other wheels anyhow. The wheels are 15" x 7" so tire selection is still limited. Looking at 205-50-15 tires as there is a decent selection(relatively). It currently has 195-55-15 on it now.
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Post by Captain Awesome on Sept 28, 2022 7:18:47 GMT -8
That sucks they don't have anything for you. I will say my Wife has been buying tires from them for years and we've always gotten great service. We haven't received junk, yet.
The kid only checked the one wheel on the top. He pisses me off he doesn't check em all right away. So I'll report back after I see them in person.
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Post by stickshifter on Oct 8, 2022 5:29:43 GMT -8
The race season for the yellow car is over.
Here are inks to really slow motion videos of the launches with the yellow car on this past Thursday testing.
First video had the 2nd stage of nitrous turn on at 400mS and that's when it started to rattle the tires. Wheelie bars set at 5-1/2" and 6" with 9psi in the tires and 30# weight on the front.
Second pass had the 2nd stage turn on point moved back to 1.1 seconds and the wheelie bars set at 5" and 5-1/2". had a 1.08 sixty foot time. It was a pretty clean pass.
Third pass had the 2nd stage turn on at 600mS based on the data graph from the previous pass. We also removed the 30 pound weight. Again, close but the tires get upset when the 2nd stage turns on.
For the fourth pass I split the difference and set the 2nd stage to turn on at 900mS. This came real close but did upset the right rear tire a bit. However, it did drive through it and I never really felt it in the car. Had 1.04 sixty foot time. Then is smoked out the right header just before the finish line with some extra flames too. Burnt #4 piston.
So right now the issue is to figure out how to keep the car happy when the 2nd stage turns on sooner. I want to try the big tires again and play with the tire pressure. The clutch setting looks to be about perfect. The data graphs actually look damn good before the tires start any shaking. Everything looks a LOT better now in the graphs.
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Post by 67roguexcode on Oct 8, 2022 7:32:24 GMT -8
Kevin, you're at a level most of us have never hoped to achieve, so just take this with a grain of salt. At what point is it simply the tires?
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Post by stickshifter on Oct 8, 2022 12:36:25 GMT -8
Kevin, you're at a level most of us have never hoped to achieve, so just take this with a grain of salt. At what point is it simply the tires? Bob, that is not a simple question. It can be that I am trying too hard with the junk I have. But when I see others going faster than me, I just have to try and find the edge of each part. And I believe sub 1 second sixty foot times with that tire is possible. Time will tell. The top dog in the class is making about 1900hp with 640 inches. That's about 3.05 hp/ci. My 1450hp with 485 inches comes to about 2.99 hp/ci. I'm not far off but still room for improvement. And using the power efficiently and effectively is the main goal. Unfortunately I am racing 235 pounds over min weight. So if I get rid of the driver and a nitrous bottle we'd be ready to fight. LOL But in the mean time, here is the damage. Not too bad at all. A new piston and rings, exhaust valve and seat. Maybe a little welding in the chamber. But an easy fix for sure.
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Post by lenniamc on Oct 9, 2022 3:12:21 GMT -8
What about finishing the billet heads should go over that 3.05 hp/ci Are you running a stiff sidewall slick ?
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Post by stickshifter on Oct 9, 2022 10:02:04 GMT -8
Are you running a stiff sidewall slick ? Yes, they are at least listed as stiff sidewall. They are MT 33 x 10.5w x 16 PN 3169W They are on a 16" x 16" bead lock rim and running with a tube.
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Post by stickshifter on Oct 10, 2022 5:56:34 GMT -8
Nitrous flow test
3.3 pounds in 4.00 seconds == 2970 lbs/hr
~=750hp based off Monty Smith's magic formula. But probably less as there is a LOT going out the exhaust. FWIW, that is a LOT of nitrous on a small engine.
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