Rear Tire selection

[masracingtd1167]

Sounds like you are going in the right direction ! .04 gain in the 60 is very good !

[wideopen231]

Eager to hear how the MT's workout on full run. I am leaning towards them for new set for car. You do R&D helps my wallet.LOL

[dusterdave173]

OK
After a big week end at Steel in Motion I have news to report
I have discovered my car LOVES to leave from idle
I sort of found the cure for everything
I am at 8 lbs on my MT 33x10.5's--leaving from idle Vs. raising the RPM has calmed all the ills right down
It made two fantastic passes --track was great and it was Rocking down through there!
Car hooked smooth and launched straight as a bullet everytime leaving from dead idle , footbraking
I have finally found what it likes so all the tire pressure ups and downs and spinning / not spinning etc seems mostly to have been about the track prep or lack of
On a good tight track car has always been good but this wk end I think I found the key
Yahoo!!!

[jspell]

Hey Duster Dave, how about some ET & MPH numbers?  Glad to hear it's sorted out.....

[dusterdave173]

I also added another 8 lbs to the front for total of 40 lbs
It really seemed to Make the combo
I will admit that at the Show yesterday there were no clocks just flag and go but I was able to tell none the less--It is Working like a car should now!
Added weight, leave from idle, wheelie bar about 3 inch ( no higher) tires 8-  8 1/2 range and
Away we go! Car smooth as a new jar of Skippy!
Seems like everything got better with leave from idle--I had left as high as 4000 range--mostly around 2500  It would leave hard as $%&# but was too violent at the hit just upsetting everything
Now...I really feel like I have a handle on it

I feel ready for the season now!
One note--it has never bounced at all during shut down and it did this week end--don't know if it is the lower tire pressure ( lowest I have run) or maybe was track surface--I am usually like Gladiator and tour the top end like checking out the dirt where I am going to fight but this is the ONE time I did not check out top end and it was some hard bounching down there--I think it was the track and maybe I got on the binders a little too hard too fast --That was No fun at all--I got back on it for one second and then eased on the brakes and was able to calm it down--Bounced my helmet off the cage a time or two--
I keep learning this thing, maybe by about Sept I will have a real handle on it all.

[codysisson]

I had my first test and tune of this year last Wednesday. New convertor picked up1.5 tenths and 5 MPH. 8.20 @ 160 MPH. I I ran my Hossier 31". I started at 7.5 pounds and ended up @ 9 pounds for a cold track. Air temp was 62 degrees.

WE have our first nostalgia race at New England Dragway tomorrow. I hope to see some of you there??

[dusterdave173]

Those are rocking numbers! 8.20 is fantastic--You have it now--
Any converter change that gains like that is great--really means you were not off by much at all --but sure went the right direction on "tune up"  Great results!

[masracingtd1167]

Dave is this your car ?

[dusterdave173]

Thats her! We had a great time at Steel in Motion show last weekend--
Fantastic car show!

[retroboy]

I love that no one seems to paint their cars anymore  (myself included ). The bare metal look rocks .

[dusterdave173]

I had a paint scheme done by great local designer--but when I priced materials I almost had a stroke-had name lettered on cowl and that is it! That is my first tin bending so cowl is not as slick as Calif cars from back in the day but hey...did it all myself.

[codysisson]

Nice looking car Dave!!

I have some more data from the race this weekend. I ran 5 times, the first 4 laps were 8.21 - 8.27 @ 161-162 MPH. 31" Hoosires, 9.25 ponds of air, 8200 RPM through the lights.

I went out in second round but was able to take one last test run so I put on my 33" Mickey Thompson tires. I went out 30 minutes after my last run , the track temp was 110 degrees both runs. 9 .25 pounds of air pressure. The fourth run I ran 8.244 @ 162.18, the fifth run with the M/T's I ran: 8.249 @ 161.63, 8100 through the lights. 60' time was .014 slower with the M/T's but they launched hard.

I learned  a whole lot with all those runs. I am very happy the car is so consistent. I hope this isn't too much information but since I started the conversation and received a lot of great advice and information from all of you, I wanted to share what I found out.

I still need to pick up 2 tenths because we have a great 8.0 program here.   So I am going to drop my gears from 4:57 to 4:11 to get the RPM in the correct power band of the engine and hopefully pic up a tiny bit there.

[masracingtd1167]

Cody I have a 4.30 ring and pinion that you could try ! Nice job on your runs !Bill

[wideopen231]

Cody,

  Question why do you feel going to higher gear will pick you up?Don't take it wrong just seems odd unless you have reason to believe its to much and calming it down will make quicker. I have done just that.Spent 3 years(match race 1 time per) trying to run a 3 second 1/8 at local track.The year I said screw it and dropped blower ,pulled some clutch and added little fuel.Bam 3.98@183,first 3 second run on that track.
What is low in trans? What converter stall?

[codysisson]

1:76 trans gear, 5700 stall

I dynoed the engine and it starts to fall off around 7200. I am going through the lights @ 8200 and it is falling off before the lights. My thoughts were to get the rpm down closer to the max power curve. Does that make sense or am I not thinking correctly?