Track times....help

[Shimy87]

Ok for the racers here, I'm confused and need help. You can see in my sig what car has. Running 24 lbs. boost with alky. Settings on TT chip are 129 on timing ( aggressive mode) and over all fueling set at 109, getting 789 on SM at end of track. First gear fueling set at 115, was down to 113 but was getting slight knock so went back up to 115. I think the car is tuned as good as I can get it with a margin of safety with just the SM. Maybe could get a little more aggressive with high gear fueling but don't want to hurt it.

Here's question, last time out with not quite as fine a tune, it went 12.5 at 108.34, 60 foot time of 1.904, 88.64 MPH at the 1/8th. This time out it was a bit warmer and went 12.993 at 107.02, 60 ft of 2.074, 86.46 mph at the 1/8.

I'm on street tires and they put a generous amount of sticky on the track. First numbers, I was leaving with about 4-5 lbs of boost, no tire spin. This time I pushed it up to 6-7 lbs at launch and spun just a bit, very little.

I don't know so I'm asking. If I get drag radials I don't think it will help because even with my tires I'm not spinning much, if at all. car feels like it comes on pretty strong after the 60 ft but I cant get it to launch hard. And I don't think the brakes will hold at the line with much more than 7lbs?

I think the stall on my converter is about 2400-2500, is that with the larger turbo killing my holeshot?

Looking for any advice.....Tha nks!

[good2win22]

I busted a 60 foot time of 1.59 on MT ET streets, foot brake launch with somewhere in the low teens on boost.  Had to play with the air pressure to get a solid contact patch. 13 psi cold was at 15 psi after the burn out.  Not sure about the other brands but those tires worked well for me.  Suspension set up is another thing to figure into the equation

[Shimy87]

How in hell did your cars brakes hold that much boost? What stall converter do you run?

[good2win22]

3000 stall on the converter.  Aluminum drums with both long shoes installed on front and rear.  You have to buy two sets of shoes.  Also have the S-10 wheel cylinder which has the bigger diameter. 
 
I feel that I had that car set up pretty good suspension, tranny and brake wise... Just didn't make the power.  Power will be solved over the winter but I'll be starting over with the suspension on my limited

[motorhead]

I'll see what I can dig up from a few years ago when I finally broke into the 11s.  I am pretty sure I did a 1.7 60' time on my low profile Nitto DRs (not that 555R junk).

[Forzfed]

I busted a 60 foot time of 1.59 on MT ET streets, foot brake launch with somewhere in the low teens on boost.  Had to play with the air pressure to get a solid contact patch. 13 psi cold was at 15 psi after the burn out.  Not sure about the other brands but those tires worked well for me.  Suspension set up is another thing to figure into the equation

I went a best 60ft of 1.61 with a stock converter holding 15psi on my TE-44.  Stock suspension and brakes.

[larrym]

I left at 5 psi on Nittos for a 1.69 60'
With a Hellwig ARB cheap rear shocks and wore out saggy springs single adjustable QA1s up front set super soft at the track and no front sway bar

[Forzfed]

Correction, I only held 10psi on the line with the TE-44.  I held 15psi on the stock turbo.

[Scoobum]

What the convertor is doing is all important. If you had PL then you'd know what it's 'flashing' to on launch...and also what the RPM drop is at the shift points.

You're guessing on your low gear fueling. PL takes all the guesswork out of it.

If you had PL you'd know for certain if you're breaking the tires loose on launch...or elsewhere down the track.

Piss on DR's...go right to 28x9 slicks.

If you're alky turn on point is to early...then all you're doing is drowning the engine. Your short time and 1/8th will suffer.

Line lock will keep the rear brakes cool...and Jason and I have the same rear brake mods. I've seen me launch as high as 4200 RPM.

I run 90/10's up front and QA1 single adjustables on the rear. Dan Keller videotaped my car launching a while back...and it was unloading the rear tires...so that's why I went to the rear adjustables.

[Shimy87]

Wheree can I get info on the pl. Wheres a good place to buy.

[motorhead]

http://www.ihadav8.com/forum/index.php?topic=2478.msg54388#msg54388

In the second picture you can see that the car is holding about 9-10psi @ +/-3650rpm and pre-launch AFR is in the mid-13s (.819V), and after that it spools up pretty quickly and stays above 25psi through the traps with just a tickle of KR.

And the bitch even ripped off a 1.7 second 60' time on the NT05Rs set at 18psi (cold).

[good2win22]

http://www.ihadav8.com/forum/index.php?topic=2478.msg54388#msg54388

In the second picture you can see that the car is holding about 9-10psi @ +/-3650rpm and pre-launch AFR is in the mid-13s (.819V), and after that it spools up pretty quickly and stays above 25psi through the traps with just a tickle of KR.

And the bitch even ripped off a 1.7 second 60' time on the NT05Rs set at 18psi (cold).

Damn Mike!  Looks like the 30 PSI in high gear was your limit with knock. Not certain of the wideband numbers but the narrow band looked like you still had some fuel left to pull out especially in low gear if it hadn't been for that pesky knock

[good2win22]

Wheree can I get info on the pl. Wheres a good place to buy.

www.fullthrottlespeed.com


They have what you need and the support forums as well. Also there is a plethora of help to be had here

[motorhead]

http://www.ihadav8.com/forum/index.php?topic=2478.msg54388#msg54388

In the second picture you can see that the car is holding about 9-10psi @ +/-3650rpm and pre-launch AFR is in the mid-13s (.819V), and after that it spools up pretty quickly and stays above 25psi through the traps with just a tickle of KR.

And the bitch even ripped off a 1.7 second 60' time on the NT05Rs set at 18psi (cold).

Damn Mike!  Looks like the 30 PSI in high gear was your limit with knock. Not certain of the wideband numbers but the narrow band looked like you still had some fuel left to pull out especially in low gear if it hadn't been for that pesky knock

Just an overly safe (rich) tune, ironically the timing was jacked up due to a software update - it should have been 18* through the traps.

[Shimy87]

Okay, the benefits of the PL for fine tuning the motor are obvious. That being said, on this thread we have guys leaving at 5 lbs with good 60 ft times and guys leaving at 15+. With what Im doing at the big end, if I can get a 1.7 60ft I'll be in the 11's. With a 2400-2500 stall converter and a 5931 turbo is that 1.7 time possible.

I guess what I'm getting at is I would like to figure out what combination will let me launch in the 5-6 lb range for good 60 ft times, is it even possible with my current combo?