Zombie

iTrader: (2)

I beginning to think it's not going to cool off here, was hot all night with temps in the 90s, it's 1AM now and still 84 degrees out.

Anyways, onto the track passes. Went to the friday night rice fest and got 4 passes in. This is only my second time to the track with the ST80. I'm at the limit of something in my system, turbo works best on 17psi, doesn't go any faster when I turn it up. Here is how the passes looked. 1st psi number is my launch boost.

5psi launch 16psi 10.57 @ 131.11 [1.72] (tapped the limiter in 2nd gear.. oops)
6psi launch 17psi 10.65 @ 133.94 [1.73] (spun) added 1 degree of timing
5psi launch 17psi 10.59 @ 134.18 [1.75] added 1 degree of timing
6psi launch 16psi 10.46 @ 132.97 [1.65] 16psi

Last race was a grudge race against a cobra with a 2.8 KB blower/ported heads at 25psi and a braked AODE, he went 11.25 @ 122.7 [1.62]. He was heat soaked and out of ice. Vegas heat is a BITCH! My buddy's 2.8 KB cobra did go 9.96 though which is awesome for the heat, his setup works great.

Track prep was decent for the last pass, but i'm under tired and have zero suspension work. On really good track prep i've been 1.48, but those nights are very rare. At least my car is consistant, runs mid 10s every time I take it to the track.

LustrousWS6

iTrader: (1)

Nice times, Zombie. Yah all the termies throw ice packs on top of their blowers and a lot of them run some amazing times, especially for LVMS. Mid 10's are nothing to be ashamed about

Navy David SS

iTrader: (13)

Nice runs in the heat. Will it ever cool off out there.

You can now change your title if you want and add your name to the FI list. Both stickies are at the top of the page.

David

Again congrats

CalSpeedPerformance

iTrader: (64)

I would recommend a rear gear change from the 2.73 to something more like a 3.42

Your 60 ft times are where you should concentrate improvement.

ninetres

iTrader: (35)

Sweet. I went to Sac last night. 10.16, a couple 10.2Xs and a few ice skating passes in the mid 10s spinning all over. lol

It was warm in sac too. I couldn't get the car to leave real well either. 1.5X 60's. I swaer the suspension under this car should have 1.30s or better in it. Driver-mod? lol

Zombie

iTrader: (2)

I use to have 3.50 gears and the car was undriveable on the highway. My gearing doesn't affect my 60' at all, i just have to leave with more boost. I've been leaving harder with the 2.75s than I did when I had the 3.50's.

I'm going to try a 28" tall tire to see if I can coss the line at the top of 2nd.

W8N2SQZ

iTrader: (6)

Zombie,

You ALWAYS have tons of data. Your posts about this stuff or your set up are very detailed. Thanks for the info.

Do you think the reason your car does not respond to a gear change is more info leading to a change in converter? I know you have discussed this lately.

Maybe there is a correlation between taller gear not leading to an increase in ET and more boost not leading to an increase, which is telling you that you're blowing through the converter or its out of its efficiency range?

Great info though
Glenn

FANTAZ28

iTrader: (2)

well with your gear your converter is under such load that the more boost you run the more it will slip... that's why you aren't seeing a gain in more boost.

Zombie

iTrader: (2)

Interesting theory. Will be testing it out with with a taller tire and treating it as a power glide.. I hope.

I ran the car all the way out in 2nd gear on my 1st pass and was still about 300 feet shy of the line. The good news is that none of this stuff affects the car on the street which was the primary purpose of the car. Getting really good 1/4 mile times out of it is just a huge bonus. I never thought I'd have a cheap and reliable mid 10 sec car. This setup works great for my use.

Pro Stock John

iTrader: (34)

Racing on 26's or 28's right now, sounds like 26's.

I think you could leave on more boost but more gear would make sense.

On my 10.05@137.7 pass I hit a 1.51 leaving on 5 psi at like 3500 and dead hooked/ bogged. I need to leave at like 4500. I don't think my converter would like me running a 2.73 gear with my 28's.

Zombie

iTrader: (2)

my tire height is currently 25.4, so they are definately short. My best 60' was 1.48 leaving with about 9psi and 4500 rpms. I'm hoping with the 28's that I'm going to be able to leave on 9psi which will get me to full boost faster and with more hook, but I have no idea if it will work until I try it. My friend has a looser vigilante converter laying around I might try out. With 28" tires I'll be good for high 130 traps with my 7000 rpm limiter. I should probably get a set of skinnies to help with weight transfer too. I'm definately doing things the hard way, but it's working pretty decent. I don't know many people that have a proven mid 10 sec street car that they drive to the track with.

fenix999

iTrader: (17)

awesome info, and yeah i agree to try the whole semi power-glide deal and see where it gets you. You just gotta find out what running through the lights in second and im sure it will have to improve your times or MPH somewhere, that way you can eliminate another theory etc... Then its obviously easier to find the right combo and narrow down the right tire size that performs best, good luck man! keep it up

2001-WS6

The limitation on the kit is probably still going to be back preasure.

Yes, you'll need the 28" tires to get your 60' back down again. That turbo will just blow those little tires away even with your converter and gearing. Drop that 60' back to a 1.5 and your ET will match up to the old turbo with 2-3lbs less boost which would be inline for the power you're making now.

You're loosing the mph to the converter and the heat. Figure the heat is sucking up at least 4mph to what the rest of the guys will be running on that turbo right now.

Rick

Zombie

iTrader: (2)

Local photog snapped a pic of my car.

Pro Stock John

iTrader: (34)

Actually running the 2.75's and 26's is working for you though you need to leave on more power if 1.7's are not the result of spinning. Why not set your 2 step about 500 rpms higher and see if you can hook it?

code4

iTrader: (30)

Check it out Zombie, I took my car to the track with the 2.75 gears. I am the guy from montana. The track elevation is 2506, I don't know what the DA was.

https://ls1tech.com/forums/forced-induction/993580-track-results-tc-78-a.html

longrange4u

iTrader: (2)

Interesting that your times are slower then with your 76GTS... too much turbo?

2001-WS6

Times are on par while running 2-3lbs less boost which would track with the difference in the turbos.

You have to remember that every .1s difference in your 60' is worth at least .2s at the end of the 1/4 mile. So he's actually tracking pretty well with all other things being equal.

Rick

2001-WS6

He's going to need the 28" tires to really do that. The baby tires are not going to be able to hold this turbo on anything above 9psi at the line. It's getting to the point where weight transfer is king and the stock wheels and tires on the front are become an issue.

Rick

longrange4u

iTrader: (2)

That math makes sense... good point.