Caribe

iTrader: (1)

My previous 1/4 times were:
60'- 1.814
330-5.193
1/8- 8.028
MPH-86.88
1000-10.495
1/4- 12.553
MPH-108.26
My latest after LT install,custom y-pipe, nittto dr's and diablosport custom tune was:
60'- 1.709
330-5.081
1/8- 7.942
MPH-85.78
1000-10.449
1/4- 12.580
MPH-105.38

I was wondering if anyone else had worst times after their LT install. The temperature was much cooler also.

5POINT7

I'm willing to bet the problem is in the tuning, not the LT's. What kind of tune did you use?

2_wacko

iTrader: (2)

Yeah might want to check the tune.

Caribe

iTrader: (1)

It was a tune through RWTD(Diablosporttuning) through a predator. This is what I read through the live diagnostics with the new tune:

3rd Gear 55mph: LTFT(1) -2.34 3rd Gear 65mph: LTFT(1) -0.78
LTFT(2) -2.34 LTFT(2) -0.78

4rd Fear 55mph: LTFT(1) 0.00 4rd Gear 65mph: LTFT(1) 0.00
LTFT(2) -0.78 LTFT(2) -0.78
WOT: LTFT(1)(2) 0.00

3rd Gear SPARK(WOT) 22.8-24.0

O2 Sensor 1 Bank 1: 900-905
O2 Sensor 1 Bank 2: 895-900

KNOCK WOT: 0

This is what was done on the tune:
- WOT Shift Points RPM: 6000
- Shift Pressure: Factory (you stated you had a shift kit)
- Shift Duration: .2ms at all throttle positions (about 25 to 50% quicker than factory)
- Converter Apply/Release MPH: +5 mph
- AIR DTC's: OFF
- Rear O2 DTC's: OFF
- Torque Management: Removed
- Fans: Set for 160 thermostat
- Rev Limiter: 6200 (Factory)
- Fuel: Set to give you around 12.8 to 13.1 a/f ratio at WOT.
- COT (cat over temp): OFF (causes the vehicle to run rich in the mid to high rpms if left on)
- Timing: +1 over factory at PT (Part throttle) and +2 over factory at WOT

LS ONE

What else did you have done before the LT's. Those are pretty impressive if you didnt leave any mods out of your signature.

hourang

iTrader: (6)

have the trans settings changed from last time?

Caribe

iTrader: (1)

No they did not. The LT's, niitos, custom tune and borla xr-1 were the only things added.

Onslaught

iTrader: (4)

It might have been the track conditions. If the track is not prepped then you will not get good times at all, even if it is cooler outside.

tomaSS

iTrader: (1)

With my longtubes and duals I gained a solid 3 mph and reduced my time .4 secs. Your 1.8 60' on street tires is damn impressive! My best 60' on dr's is 2.1. I would check your plugs and wires. Make sure none of them fouled out or wires touching the headers.

Bad Blu Formula

iTrader: (3)

I say go to a real shop and have them do a street tune (not dyno tune), and that my friend will solve all of your probelms. With the mods that you have, you should be running 12.2s or 12.3s.

chadtn

iTrader: (3)

Untuned my 02 Z28 lost about a second in the 1/8th mile after installing long tube headers...After tuning it ran about .4 to .5 slower. Mph was also down a few. Kind of depressing after spending that much money. I can't tell you why it happened...Everyone else I know picked up after the swap.

Chad

black_z

iTrader: (4)

I would look at your tune, plugs,wires, and fuel filter.

MeentSS02

iTrader: (11)

Yeah, I didn't have very impressive gains with mine either. Went from stock manifolds and cats with a cutout to Kooks LTs, catted-y, and Hooker exhaust.

Previous best:

13.49 @ 106 (I think it was like 105.9x IIRC)
2.3 60'

New best:
13.32 @ 107.47
2.15 60'

Weather condtions were similar each time, but I don't know exactly if they were or not. DA on the new best runs was ~2300 ft.

The first place I'm gonna look is my tune...I know I had to pull ~2 degrees of timing up top with my Diablo tuner to keep from getting KR, but I don't know if that's what was holding me back or not. I know I should have done better, especially with the reduced 60' time.

Oh well...it runs a lot stronger now, that's for sure. I'll get the bugs worked out eventually.

Steve

chadtn

iTrader: (3)

Has anyone noticed that about the only people who complain about slowing down or hardly any gains are the people with the 01/02 cars? It seems like there is a pattern developing. Maybe someone should do a poll. heh..

I'm sure people with heads and a cam are happy with the long tubes...But what about 100% stock motored cars installing them? Has anyone heard about people with 2000 back cars not picking up much if anything after long tube installs?

Chad

MeentSS02

iTrader: (11)

Well, the 01/02 cars did have better manifolds, but they weren't that much better...at least I don't think. Who knows...if just for the sound, my headers were worth it. I've intimidated a lot of other f-bod owners around here (the ones that know nothing about their cars). One swore I had a big block under the hood

chadtn

iTrader: (3)

I'm not saying the factory stuff is just as good...I'm just saying that maybe there is something we are missing on the 01/02 cars. I've noticed this a couple of times before...But just in the thread you've got three 01/02 cars that picked up very little or lost while you've got a bunch of people with 2000 and back models saying something is wrong if you did not pick up significant power.

My car ran STRONG before I installed the long tubes...I was very pleased with it. About the same time a friend of mine with a 1999 Z28 and almost identical mods to mine installed the exact same long tubes and y-pipe I did. His car picked up big time...Mine slowed down. Just driving our two cars was a night and day difference...His seemed to pick up power all over while mine felt weaker all the way around.

What I'm getting at is I think long tubes are a great mod that can pick up tons of power...But it seems like most of the people who complain about them have 01/02 cars. I can't think of any MAJOR difference between the 2000 back and 2001 up cars that would cause this. You'd think if anyone was having a problem it would be evenly distributed across each model year. What is it we are missing or doing differently?

Chad

MeentSS02

iTrader: (11)

I understand your point completely. Honestly, I thought I'd gain more at the track, because SOTP-wise, I can tell a big difference with my headers. It is stronger all over, but the numbers at the track certainly didn't reflect that.

I dunno what I'm missing either...I'm gonna get some tuning software, and hopefully next spring I'll get back to the track and see what I can come up with. I was rather disappointed after I got home from the track that night, but only one buddy of mine with similar mods was trapping higher than me (by almost exactly 1 MPH). His traps went from:

Before headers: 104.xx MPH
After headers: 108.xx MPH

He has a BBK 80mm TB and an 85mm MAF sensor, which we all know both have disputable gains. His is an '02 TA. He, however, didn't put money into his suspension and was spinning 2.3-2.4x 60' times all day long.

There are just too many variables...I'm hoping good logging/tuning software will shed some light on this. I'm getting rid of my cats in a month too, so maybe that will account for some of it (he just put his headers on, mine had been on for 8-9 months or so).

Steve

2000blackSS

ive got a 2000 SS m6 ive trapped 106.8 for the last 10 runs.....its un tuned i have a k&n fipk and LCA's its pissing me off because i know the car should trap in the 110-112 range

boosted03cobra

i know how feel when i put macs on my ws6 my times stayed the same to

glennster

iTrader: (1)

MPH went way down,6000 rpm shift point to high for factory valve springs.They will bounce at 5800.Your 7.94 et matches mine but I MPH @90 in the 1/8th.Find your HP loss,its not the headers.Did you do the age old "10 mods" at one time?