texas99Z28

What do ya'll think my 1999 z28/A4 will run? MTI lid, smooth bellows, SLP LM! catback, 3.73 gears?

ta_06374

iTrader: (7)

Anywere from a 12.8 to a 13.2

BOLO

iTrader: (40)

With street tires, maybe mid 13's.

Krazy98Z28

iTrader: (12)

With those gears and a good tire I don't see why 12.7 isn't doable

darrensls1

I do. He has a 99 so it'll have an ls1 intake to go along with a power robbing automatic transmission. When I was lid, catback and SSRA only I could only get 13.4 @ 105 on street tires with 3.23's here in western NY.

If his car performs like mine did then he'll be lucky to get a 12.9 -13.1 even on drag radials. The gears will help his launch but a stall would help it a lot more. With a 3400-4000 stall I could see 12.5-12.8.

Add LT's to that stall and say hello to the times in my sig (if not a little better with his 3.73's).

Villain281H

iTrader: (5)

darrens comments are right on IMHO.

My 2000 A4 Formula with 3.23 gears, lid, K & N, FTRA, flowmaster catback and M/T sticky tires goes 13.30s at 103-104 mph with a 2.05 60 foot in summer and 13.0s at 106-107 mph with a 1.93-1.95 60 foot in good fall/winter air (under 500 DA). The gears will help some, but the stock convertor will hold you back.

Derek

jmill96Z

iTrader: (3)

Where in TX are you at? The DA can range from -500 to 4000+.

texas99Z28

What can I expect to run in the quarter w/1999 z28/A4...MTI lid,smooth bellows, SLP LM1, 3.73 gears? 315rwhp.

FASTFATBOY

iTrader: (23)

12.90@107

In good air.


David

texas99Z28

Thank you for your reply. A bigmouth at work says no way will I run under 13 secs. I tend to agree with you

FASTFATBOY

iTrader: (23)

You will need drag radials OR a damn good track. You also have to take into account air temp, track elevation etc.....if you are at 3500ft like New Mexico or something...no

I had buddies one with a Formula, the other a Z28, here were there mods

Lid
cutout
converter
free mods
Cats removed
drag radials

Both cars ran 12.40's

You are a converter and drag radials away from easy12's

I had another buddy with a 2001 SS six speed car, only mod was a lid, on showroom tires, 12.80@110 mph...I was there, I saw it...he CAN drive.

All the above times listed abover were at sea level in good air.

David

wht98ls1

i have basically the same set up as you, but stock gears and with street tires my best pull was a 13.7...

FASTFATBOY

iTrader: (23)

2.73 gears, right?


David

wht98ls1

3.23 a4....

FASTFATBOY

iTrader: (23)

Kinda slow, a bone stock auto with 3.23 gears SHOULD run mid 13's


David

Krazy98Z28

iTrader: (12)

ok then why did my 98 Z lid, slowmaster 2:73s run 13.1@108 ????

darrensls1

You trapped 108 because you either have a wicked factory freak or a previous owner put a very small cam in it. Most of us pre 01 autos don't trap 108 until after LT headers. It took full exhaust and then some for me to trap 109.

You got a 13.1 ET from a car trapping 108 because the 2.73's and stock stall are both holding you back from anything that resembles a hard launch. That trap is good for mid 12's with the right gear/stall/tire.

Krazy98Z28

iTrader: (12)

Will I can tell you it didnt have a cam and I can also tell you it was not a factory freak, the car dynoed 285RWHP

My 98 T/A M6 ran 12.9@109 with just a cutout back in 2000

Does not take much to run high 12s in these cars.

Villain281H

iTrader: (5)

Don't create a duplicate thread on the results side.
This question belongs on the tech side, so use your first thread. I've merged the two for you.

Derek

darrensls1

285 rwhp + 3400-3500 lbs + 2.73 A4 does not = 108 trap speed. Something is very wrong here. It would take very considerable weight reduction for this to be even close to possible. Or a hurricane of a tail wind.

Evan smith went 12.89 @ 108 in a stock M6 LS1 way back when. But 6 speeds have better gears (3.42) and more rwhp (less drivetrain loss). But that is irrelivent when discussing A4 performance and capabilities which is what this thread is about.