Why Cant I get into the 12sec with my car

**gmtech86** · 10-21-2010, 11:22 AM

I have a 1998 Trans Am with a LS6 Intake, OBX long tube headers, 3.73 gear, SLP lid and a dyno tune from SPEED INC. The best time I got was a 13.05 at 106 mph ?

**DIRTY JERZY** · 10-21-2010, 11:31 AM

Originally Posted by gmtech86

I have a 1998 Trans Am with a LS6 Intake, OBX long tube headers, 3.73 gear, SLP lid and a dyno tune from SPEED INC. The best time I got was a 13.05 at 106 mph ?

AUTO? somethings not right I'm running 13.1 at 108 mph im a m6 with stock manifolds

**gmtech86** · 10-21-2010, 11:34 AM

yes it is a auto

**Faught** · 10-21-2010, 11:36 AM

get some DR if ya dont have any if u run street tire like i do you spin 1st and into 2nd

**Z28Thunder** · 10-21-2010, 11:40 AM

I take it you're on the stock converter. It will be hard to get a good 60' with the stock converter. The stocker is a 1900 ircc so it has to come up from 1900 rpm to get in the power band.

**jiveass** · 10-21-2010, 11:40 AM

elevation? ask luos about that...it can be a real bitch...you should be at least high 12s in my neck of the woods...

**jiveass** · 10-21-2010, 11:41 AM

Originally Posted by Z28Thunder

I take it your on the stock converter. It will be hard to get a good 60' with the stock converter. The stocker is a 1900 ircc so it has to come up from 1900 rpm to get in the power band.

or this lol

**Z28Thunder** · 10-21-2010, 11:44 AM

Originally Posted by jiveass

elevation? ask luos about that...it can be a real bitch...you should be at least high 12s in my neck of the woods...

It's DA not just elevation that is a bitch...

**Firebirdjones** · 10-21-2010, 11:45 AM

Originally Posted by gmtech86

I have a 1998 Trans Am with a LS6 Intake, OBX long tube headers, 3.73 gear, SLP lid and a dyno tune from SPEED INC. The best time I got was a 13.05 at 106 mph ?

Your MPH is more than enough to support a 12 second run. The issue is your 60 foot time. Without a converter these LS1's are a little soggy down low. A good converter and a set of tires that allow you to use every bit of that new converter will cut 1/2 a second.

With savy driving on stock rubber you can still see 2-3 tenths improvement with a converter change.

**Z28Thunder** · 10-21-2010, 11:46 AM

Originally Posted by Firebirdjones

Your MPH is more than enough to support a 12 second run. The issue is your 60 foot time. Without a converter these LS1's are a little soggy down low. A good converter and a set of tires that allow you to use every bit of that new converter will cut 1/2 a second.

With savy driving on stock rubber you can still see 2-3 tenths improvement with a converter change.

Sounds like post #5..

**Mr. Luos** · 10-21-2010, 11:47 AM

Needs a stall.

Regardless of DA....a stall would get this car into the 12's fairly easily.

**gmtech86** · 10-21-2010, 11:49 AM

I have a stock convertor im in illinois and my 60 foot time is 1.987 and im not spinning my tires off the launch

**Firebirdjones** · 10-21-2010, 11:49 AM

Originally Posted by Z28Thunder

It's DA not just elevation that is a bitch...

Exactly, you really need to calculate DA numbers to compare times from different elevation changes.

Just because Luos races at a track that is 7,000 feet up doesn't necessarily mean the air is that bad. With cool weather and the right conditions you could see DA numbers actually below the elevation you are at.
On the flip side of that coin, with hot humid summer days the DA can easily climb above the actual elevation.

**Z28Thunder** · 10-21-2010, 11:50 AM

Originally Posted by gmtech86

I have a stock convertor im in illinois and my 60 foot time is 1.987 and im not spinning my tires off the launch

The stock conveter is your problem.

**Firebirdjones** · 10-21-2010, 11:50 AM

Originally Posted by Z28Thunder

Sounds like post #5..

Ah, I see that now

**gmtech86** · 10-21-2010, 11:52 AM

What Stall should I go with ?

**Z28Thunder** · 10-21-2010, 11:52 AM

Originally Posted by gmtech86

What Stall should I go with ?

I would go with a 3500.

**Mr. Luos** · 10-21-2010, 11:54 AM

Originally Posted by gmtech86

What Stall should I go with ?

Yank 3600

Originally Posted by Firebirdjones

Exactly, you really need to calculate DA numbers to compare times from different elevation changes.

Just because Luos races at a track that is 7,000 feet up doesn't necessarily mean the air is that bad. With cool weather and the right conditions you could see DA numbers actually below the elevation you are at.
On the flip side of that coin, with hot humid summer days the DA can easily climb above the actual elevation.

Bandimere is at 5800 feet.
The air sucks.

Never run the car in under an 8K DA. I have driven it when it is like 6K....winter time. Let me tell you....could only imagine having a cool November day out at Atco (in Jersey) with this car.
Think that cat with the Z06's got a -800DA out there once....Ranger I think??
Did the correction on mine to -800....let's just say with a little more gear and some weight out....could be looking at 9's set-up proper. Maybe if I get that TBSS I could go all out with the T/A...
/thinking outloud

**Firebirdjones** · 10-21-2010, 11:55 AM

Originally Posted by gmtech86

I have a stock convertor im in illinois and my 60 foot time is 1.987 and im not spinning my tires off the launch

I know what you are saying. My auto was the same way with the stock converter. With the track prep very nice, I could flat nail the gas, and the car would dead hook. The problem was though, the tight stock converter kept the engine below it's torque peak for 30-40 feet while the rpms slowly climbed.
Made for a deadly consistent car, just not what it could be though. A simple 3400 stall not only made the car quicker, but that well prepped track suddenly became a challenge to drive on the same stock rubber. My 60 foot times still improved with a little finess driving, and the car immediately fell into the 12's, with just headers and the converter.