street demon2k3

iTrader: (3)

Finally after 4 years I bought another fbody, 98Z auto, and did a few things to make it a little faster. I installed BBK LTs, lid, Borla catback and tune.

Got two quick runs in and wasn't too impressed. Both runs were on Nitto drags with a pretty much dead hook. Times were as follows:

13.40@105.5 2.1 60ft leaving off idle
13.45@105.7 2.1 60ft leaving at 1300rpm

Not bad I guess but my buddies stock 02' WS6 6-speed ran 13.0@107.6 1.9. 60ft. We went from a 60mph roll twice and we were dead even till 110. Only thing I can think of is the 2.73 gears are killing the car and stock shift points.

JRENIGAR

iTrader: (37)

yeah the 2.73's take a bit to get rolling w stock converter. An LS6 intake and some gears should get you into the 12's no problem.

mjs1012

iTrader: (36)

A converter and gears will really wake that car up and lower your et by a lot if you can hook.

ULTIMATEORANGESS

iTrader: (4)

your trap seems low and your 60 should be better with nittos. jmo based on what you should be running.

senicalj4579

iTrader: (41)

Nothings killing your car. It doesn't look like its running bad at all. You did leave out some important info like density altitude but it seems to be going what it should according to the mods.

My car when it had your mods + SSRA did 13.1 1.9 60' in 2200 DA and 12.6 in 1.9 60' -1000 da.
As you can see, the weather is a huge factor.

thunderstruck507

iTrader: (18)

Seems like it's bogging slightly. Figure out the DA for starters. Then after you make sure there isn't something wrong with the car (plugs, fuel filter, etc) get a 3600-4000rpm stall converter. Problem solved.

BTW, what do you mean when you say "tune"? Mail order, street, dyno, or (hopefully not) a programmer?

street demon2k3

iTrader: (3)

We're at sea level down here in Texas and the car has a street tune that made a huge difference from before. Only thing I can tell is the shift points are stock and it does seem to leave pretty weak. Street tires though, from 50 it will get sideways a little (tires are almost gone though).

It seems ok for the mods but I expected more.

ULTIMATEORANGESS

iTrader: (4)

i dont know. you should be running solid 12s with LTs. id try first getting better traction and go from there.

ULTIMATEORANGESS

iTrader: (4)

maybe youll need a trans tune also.

thunderstruck507

iTrader: (18)

Could be partially tuning. Low end timing, torque limiting, burst knock, false knock, etc could all hinder 60ft.

Not sure raising the shifts much on a stock cam will net much.

Full-Force

iTrader: (11)

2.73's and stock converter is your problem. Put some 3.42's and a loose converter and watch some 1.7 60' or better along with over a half sec drop in et

lynx853

iTrader: (8)

a 2.1 60ft is KILLING your time, I could do 1.8 on bald eagle f1's. Stall it higher and enjoy 12's!

floman

iTrader: (54)

I had a stone stock 98 Z28 with auto and 2:73s. With 114K miles and on street tires it ran 14.20 @ 99 mph with a 2.1 60 ft time with my big *** in it.

After some bolt-on mods, QTP 1 3/4" LTs, LS6 intake, ported TB, Lid, free mods,SLP dual/dual catback, 3.42 gears and nitto 275-40-17 DRs, and last but not least PI Vigilanti 3600 conv. Car ran a best of 12.13 @ 110.5 mph on a 1.663 60 ft. Managed to cut over two full seconds off the cars ET, and would pull the driver front tire about 2" off the ground on the launch. Car never had even a valve cover off of the engine before.

Some people claim the 98s are the slowest, I say hogwash!

OP, invest in a quality converter and possibly some 3.42 gears and the car will surprise you.

Z28SteveA4

iTrader: (16)

with full exhaust and a lid on my car I was ranging from 12.6-9 depending on the weather with 1.9 60' your not far off. just a bit more traction and seat time. get rid of those 2.73's as fast as you can lol

RevGTO

iTrader: (12)

My car ran 13.40 w/ 2.1 60' the second time I had it out with lid, catback, 3.42s and good air (for here in the 1/4 mile high city). So with full exhaust and good air down there, yours has more in it. Gears will help, but if you want to break into the 12's, a converter will get you there right quick.

FinalCam

iTrader: (3)

My car with headers, y pipe, stock catback and a tune ran 7.98@90 in the 1/8th

Left around 800 rpms and cut multiple 1.86 60's on 275 nt555 street tire.

I think your car has more in the 60' even with 2.73s