Stalled, blown, auto...street tires?

[justinschmidt1]

So I was thinking about going to the track tonight since its the last street racing for the year....I will be running one some 16 inch street tires.

Anyone think this is gonna be hopeless?

Im hoping to improve my 60 foots a bit...but Im thinking I wont hook at all.

 

[BigTang]

depends on how wide they are. i spin my ass off on the stock waffles w/ BFG TRACTION TA's...i should sue them for misrepresenting their product

 

[Paul]

Just go to the track and finally get some real numbers for us. You should be able to get a 2.0 60' even on street tires with a little practice. I was pretty consistent high with 1.9-2.0 short times in my convertible with about the same power, more torque, and more weight.

You just have to "launch" at idle, roll the tires over, and don't powershift.

Paul.

 

[justinschmidt1]

lol....I cant powershift my auto.

The problem is that with the high stall its like an on/off switch..wont really go anywhere unless im giving it a lot of gas...and with the 20 degree weather, no track prep, the street tires werent cutting it.


the best time of the day was when I first got there..probably becuase the track was hotter and I was able to not spin through the 330.

Anway, I was able to cut a 1.996 60 peddling through first and the 1/4 was 12.71 @ 110.

1/8 was 8.21 at 87

With a set of slicks I would imagine I could launch into the 1.7x 60 range atleast....which would hopefully take my 1/4 down to a low 12, who knows, maybe I have a shot at a 11 second slip.

I still need to get some differant lockup schedules for the converter and see if I can figure out which is fastest cause apparently locking it up in second and third is the best way to go?....I dont know, thats what ive been told.

Mine is staying unlocked through 2nd and third and locking up at the end of each gear I guess.

I just dont think the NPI has the top end to justify having the converter unlocked to keep the rpms above 5k throoughout the gears.

 

[BigTang]

in my old ride i was locking it up as soon as i went into 3rd but it was on a manual switch so it was a PITA to be consistent w/ it. does it launch any better bringing it up on the foot brake instead of flashing it on your set up? sounds like you played w/ it enough to find a sweet spot.

 

[justinschmidt1]

in my old ride i was locking it up as soon as i went into 3rd but it was on a manual switch so it was a PITA to be consistent w/ it. does it launch any better bringing it up on the foot brake instead of flashing it on your set up? sounds like you played w/ it enough to find a sweet spot.

Ive got like a 3600 or so stall...I cant launch at all...just rolling into the throttle from idle was blowning the tires off big time in the cold with street tires.

It looks like it will foot brake to about 2500 or so...but again, tires will instantly be blown off with street tires.
I need to buy some slicks so I can actually test launching from a foot brake vs flashing it....ill probably go off the foot brake so I dont strain my drivetrain from flashing it.

 

[95SC]

Don't you have any friend that have slicks to borrow you.If you'd only live closer to me I'd let you use my DR's or slicks.

 

[justinschmidt1]

mmmm not really....not many people around here with fast cars yet alone a mustang that needs slicks.


I want to get some 28 inch tall MT et streets or something.

 

[Paul]

Post the timeslips.

 

[Venom351R]

mmmm not really....not many people around here with fast cars yet alone a mustang that needs slicks.


I want to get some 28 inch tall MT et streets or something.

why do you want to run 28's and not 26's ?

these make a world of difference. Im thinking of trying some slicks this summer as well.

Post the timeslips.

yes please.

 

[justinschmidt1]

Ill post slips later tonight.

Ive just heard from people that theyve had better results with 28 inch tire vs 26...

since ive got a big stall and first gear is too damn short now....the 28 inch tire just seems like a good idea...lol

 

[95PGTTech]

what gears do you have?
you pick tire height based on weight, power, and gear.

it's a small change to effective gearing. if possible, run the maximum gear available and run the tallest tire possible to get the effective gearing you need to run through the traps at redline. you could get the same effect with a tall gear and a short tire, but the short gear/tall tire combo gives you the same effective gear but allows you that much more sidewall which really helps your 60'.

for example, on a cobra you could run a 4.10 gear with a 26" tire to be running through the redlines at 7000 with the normal bolt ons, or if you could live with it run a 4.56 gear and a 28" tall tire and probably get much better times.

Even if you pull a 1.70x based on your current times the best you will run is 11.1X

 

[justinschmidt1]

what gears do you have?
you pick tire height based on weight, power, and gear.

it's a small change to effective gearing. if possible, run the maximum gear available and run the tallest tire possible to get the effective gearing you need to run through the traps at redline. you could get the same effect with a tall gear and a short tire, but the short gear/tall tire combo gives you the same effective gear but allows you that much more sidewall which really helps your 60'.

for example, on a cobra you could run a 4.10 gear with a 26" tire to be running through the redlines at 7000 with the normal bolt ons, or if you could live with it run a 4.56 gear and a 28" tall tire and probably get much better times.

Even if you pull a 1.70x based on your current times the best you will run is 11.1X

I have 3.73s....I dont feel like the npi is making too much power up top...so crossing the line at 5500 vs 6k might be a good thing with npi heads and cams.

I think you mean 12.1...if my current time is 12.7, and I take my 60 from 2.0 to 1.7 it should equal about 6 tenths...so 12.1?...

But you also gotta remember that Im running with fulll weight....when I remove my subs, sway bar, back seat, junk out of the car it makes a noticeable differance.

+ the fastest run of my night was technically the slowest as far as mph, my car was still hot from driving there.

I picked up over 2 mph from that run till the end of the night

Last run of the night was 13.1 with a 2.3 60 foot....so if the math about 1 tenth off the 60= 2 tenths of top is accurate than that time with a 1.7 60 foot should be 11.9


This is all just internet racing...I will really find out what the car does when I get some sticky tires so I can launch the damn thing.

Im pretty confident that if I can get my 60 foot down in the 1.7 range without my sway bar, rear seat, and subwoofers/amp I should have a shot at 11.9

 

[justinschmidt1]

Before converter

after converter

heres some slips I have laying around.....if you look closely you will see that my best time is when I just got to the track after driving an hour and it was still light out...so im guessing thats why I was able to get traction. My times got worse and worse cause I was getting less and less traction...I also had a 13.4x later than that...lol

If I could even hook as much as I did that first time later in the night I think I could have pulled a 12.5 with a 2.0 60 after letting the car cooldown + the cooler air.

Overall there seems to be a decent improvement in 1/4 mile times even without better 60 foot times.

 

[Venom351R]

the thing w/ tire hight and rear end gearing is the taller your tire the more it dimishes the rear end gearing. I went from 3.27's to 3.73's and when I first bought my MT ET Streets I got a 28" tires ( not what I wanted) the thing is the 28" tire would have made my rear end gearing not 3.73 but esencially back to 3.27's as far as what I would have been crossing the line at RPM wise. That is my understanding of it anyway

 

[justinschmidt1]

the thing w/ tire hight and rear end gearing is the taller your tire the more it dimishes the rear end gearing. I went from 3.27's to 3.73's and when I first bought my MT ET Streets I got a 28" tires ( not what I wanted) the thing is the 28" tire would have made my rear end gearing not 3.73 but esencially back to 3.27's as far as what I would have been crossing the line at RPM wise. That is my understanding of it anyway

Yea, I understand this...but the benefit of gears was to get the car into the powerband quicker I always thought....

So would my car actually be faster with 3.73s and a 3500 stall than it would with 3.27s and a 3500 stall?

The stall puts it up there and keeps it up there so I dont know if the gears are really doing anything

 

[Venom351R]

Ive never modded an automatic Stang so the factor of the converter when it comes to gears I cant really comment on it. What do you have done to it anyway, your trapping a good MPH

 

[justinschmidt1]

its supercharged p600b....also got bolts ons, pi intake, long tubes.

The NPI h/c are really holding me back though

 

[Paul]

I wouldn't worry too much about the heads/cams right now Justin. You're making tons of power to be trapping 111 mph. Just get some slicks and practice and you'll be kicking ass.

Paul.

 

[Venom351R]

Nice set up, I bet were pretty even power wise. Have you had it dynoed?