MattODoom

iTrader: (1)

Weight of loaded car: 3620lb.

It was overcast and slightly cool at the track.

I ran 14.57 with a 2.1 60'. Trap speed was 94.5mph. Seems a little slow to me for my mods.

Cold air, airfoil
Ported plenum, ported SLP runners, Ported stock base
Decently ported L98 heads w/ bowl work
Hedman 1 5/8", no cat, hooker 3"
Underdrive crank pulley
ZZ4 cam with 1.6 intake 1.5 exhaust roller rockers
Good tune
Brand new tires (wasnt spinning at all)
Shift Kit + Corvette servo
3.27 posi.

89IrocZ350TPI

You should be in the low 13's with that combo i would think. L98s usually run mid 14's bone stock.

MattODoom

iTrader: (1)

Before all of the mods it ran 14.9.

I was really hoping for more from everything I did to it.. only to get .4 more ET, that sucks!

89IrocZ350TPI

Somethings not right beacuse stock my 89 l98 with 2.77s ran 14.8 at 93. Then after exhaust,headers,intake,runners,chip,3.42's, along with all the little mods such as tb bypass, filter, ignition, and traction i ran 13.4 at 100. With your setup i would think you could pull off a very low 13.

five7kid

iTrader: (14)

I was dialing 14.5's with the Camaro last Friday night at our 5800' elevation track (DA ~8500'). 3475 lbs or so, 2.06 60's, mostly worn out 26x9.5x14 Hoosier Quicktime Pro DOTs. Last run was a 14.44 @ 94.7 mph.

Stall helps a bunch.

Ray87Z

Who ported the heads? If you did it yourself without really knowing what you were doing you probably hurt performance... Otherwise it's just about got to be a tuning issue, was the tuning done on a dyno w/ wideband readings or what? If not it may feel alright but be leaving alot on the table.

MattODoom

iTrader: (1)

The heads were done at RNB machine. I have screw in studs w/ guideplates, pushrod holes elongated.

Port walls were smoothed and the bowls were blended. Stock size valves.

Dont really see how you can hurt performance blending the bowls...

Demon355

iTrader: (1)

I agree with the stall comment.

MattODoom

iTrader: (1)

Putting in a 2500 or so converter is going to do 2 things:

*Make me need an auxilary tranny cooler

and

*Kill my mileage

Both of which I dont want.

MattODoom

iTrader: (1)

I made 3 runs that day. None of them was a good one, I was having tranny problems all day.

The first two passes the TV cable was adjusted too far in, and the motor bounced the 5500 RPM redline and didnt shift till I let up. Both of those passes were 14.6's.

The last pass I adjusted out, apparently too far as it shifted at about 4500 RPM and thats when i cut the 14.5

89IrocZ350TPI

A better intake along with 3.73's would be the way to go. But you probably want to keep your tpi setup since you have alot into it.

mw66nova

iTrader: (13)

putting in a 4000 stall converter will require an external cooler(in addition to the radiator coolant passages) and will effect your city mileage (though locked up on the highway it acts just like stock)

a 2500rpm converter will act almost like stock arount town and will really wake up the car on the track...don't be afraid of it.

Trevor86TA

If you aren't willing to move a little then you'll be on here all of the time asking why everyone else's car is faster than yours. Match you combo and you will be rewarded.

Ray87Z

I'm not sure the answer is to buy new stuff, the car should be considerably faster as it sits as it doesn't have any serious mismatched parts and near stock cars have gone faster. But w/ the now mentioned tranny shifting problems I'm not sure we can read much into the times at all, they're nearly worthless IMO. I'd fix the tranny issues and any other minor problems not mentioned and get some new times before you worry about how fast or slow it may be...

I had a 2400-2500ish stall in my 87Z, and didn't notice any real mpg drops over the stocker piece of junk that was stalling way too low w/ my Vortec headed 350. I wouldn't worry about going w/ something like that but I wouldn't expect it to be a cure all for your slower than expected times either...

MattODoom

iTrader: (1)

I've done a little more PE tuning and worked on the trans a bit. I figure between tuning, trans and maybe a 2500 stall I should hit 13s.

1MeanZ

iTrader: (9)

your trap speed is pretty lackluster as is your 60ft. as many have suggested if you are dead hooking and only getting a 2.1 60ft then you need a converter. I had a 2800rpm stall vigilante before i swapped in my 5 speed and I loved it, no driveability issues other than a new traction problem!

You also need to address the pokey trap speed. with a 94mph trap speed you cant expect much more than about a 14.40 or so. The different ratio rockers make me wonder, along with the aftermarket runners and stock base. Since stock small block exhaust ports are lackluster, dont you want the 1.6 rockers on the exhaust side? Even though you ported your stock base, I havent seen many TPI cars run strong with aftermarket runners and a stock base. There may be members on here that have that combination running good times and I just dont know about them. Any TPI cars I have seen in real life with big runners and a stock base never seem to run very well. My buddy did this on a GTA and it actually slowed down.

With the different ratio rockers, stock intake base, and stock converter, I smell a slightly mismatched combo.

MattODoom

iTrader: (1)

You're right about me needing a converter. And as far as the rockers go... the heads cant take any more lift. With 1.6 intake and 1.5 exhaust on the ZZ4 cam it specs out to .505/.510. The SLP runners, as you probably know, arent that much bigger then stock. They are rather lackluster in as-cast form. I ported the base to match the SLP runners.