jms

iTrader: (1)

Our club (check out www.kyfbodies.org ) had a Dyno Day, today, at Total Engine Airflow in Bowling Green, Ky.

My mostly stock 1988 GTA (350, automatic, 3.27 rear) has the following mods: Edelbrock coated headers (swapping this week to SLP 1-3/4s), no cat, Edelbrock cat-back, no smog tubes, 1.6 roller-tip rockers, 3-angle valve job, pocket ported heads, gasket matched plenum and intake, air foil, home made cold air/ram air (which doesn't help on a chassis dyno), Accel coil and plug wires, tb bypass, and Wells SU145 maf sensor.

Best rear wheel #s were 223.9 hp and 301.7 torque.

HP curve went from 135 at 2400 rpm to 224 at 4500 rpm.

Torque curve went from 301 at 2400 rpm to 285 at 3800 rpm and slowly down from there.

Found a little problem with the air/fuel ratio.

Went from 14.2 to 1 at 2400 rpm to 11 to 1 at 3800 rpm. Any ideas why so rich?

The car has run 14.0s at 99.6 mph at the track (last fall) with 60 ft times of 2.0s on street tires and full exhaust.

Other cars dynoing included several LS-1s, ranging from 275 hp-automatic #s to 320 hp stick shift #s, on stock or mostly stock versions.

Modified versions had 20-25 hp more.

Lt-1s ranged (modified versions) from 280-330 hp.

Interestingly, my torque numbers were comparable to any of the other car's numbers and more in several cases.

Saw a very late model Cougar (fwd) V-6 pull about 138 hp and 135 torque. It was turning quite a few more r's than my L98.

Comments?

jms

NufNuffZ28

iTrader: (10)

Good numbers for your mods. Your torque is due to the TPI, but the TPI is also the reason you cant get higher HP. My friend in his 1991 turned 225hp with only flowmaster and k&N, but his car has always been a little faster than our other TPI cars. Next I think you should do a cam and some intake work

Chris

u r sofa king we tah did

for as little as youve done, those are great numbers. i would be extremely pleased. TPI always has a massive torque number. its just too bad theres not a way to make the stock tpi get the horsepower numbers of a LT1/LS1. as far as the fuel problem, its kinda strange to change that drastically, maybe its time to start doing a little fuel table work in the prom.

JAY87GTA

Those are numbers I'd like to see. We here at fl-thirdgen had our dyno today also oddly enough. I only got 180@4000 but had massive knock. We had a wide band o2 hooked up and I'm still slightly lean, but hopefully I can get my timing back an improve. Real good numbers and close to what we saw also on a car with a relatively fresh motor, but your a bout 15 hp higher. Good work!

irocnroll89

iTrader: (4)

stock engine, STOCK 7R4, STOCK 2.77 B/W, with TES, AND HOOKER CATBACK, AFPR.

217HP/299FT/LBS,

Now with t-5, 3.27 .... 244/350.
i dig the almost 30rwhp for a tranny swap

Chris GTA

Thank you all for posting your numbers. It gives the rest of us something to shoot for.

jms

iTrader: (1)

I've had a day to think about this.

After a 60 mile trip (and no cool down), I was the first on the dyno and the operator had to work my car around another in the shop. Took him about 3 to 4 minutes pulling up/backing up, etc.

By the time the car was hooked up on the rollers, the water temp was over 200 (possibly 210) degrees.

My better track times are made when the car is about 160 to 180 degrees water temp (I've made runs with temps from 150 to 210 degrees-my TPI doesn't like the warmer temps).

Do you think 20 to 30 degrees extra water temp would affect the dyno numbers?

jms

JAY87GTA

It'll affect it some. What we ran into doing our runs, and mind you it was a warm day here in central FL, was the car made slightly more torque when it was cooler, and a few more HP when it was warmer. We usually let them sit about 5 minutes to cool some between runs cuz they were getting hot! The IROC that posted the best numbers was up to 230 on his best run when we shut it down, it also made it's best number on the pull.

IROCZTWENTYGR8

iTrader: (1)

Sure, you even gotta think about the plenum. People cool them off at the track all the time.

JAY87GTA

I'm not into the icing the plenum deal. It looks good for a good run, but I'm more of a 'run what ya brung'. You won't have time to ice the plenum out there at a stoplight. Our cars, and I mean every one of them made about 5 hp more on the later runs, with no tuning mind you, when they were just that little bit warmer. I don't know why, but the dyno doesn't lie. Maybe it was warm tranny and rearend oil creating less loss. I don't know, but I wouldn't have believed it if I didn't see it.

IROCZTWENTYGR8

iTrader: (1)

"I'm not into the icing the plenum deal. It looks good for a good run, but I'm more of a 'run what ya brung'. You won't have time to ice the plenum out there at a stoplight."

Hmmmph, I do agree with that.

mrr23

that and the guys with the SS Camaros with the hood open and getting higher numbers. can't lift the hood or take it off at a red light either.

u r sofa king we tah did

id say your 700R4 had some massive slipping going on. it was probably on its last leg.

Hodge

James, what's up my KY brother.
I saw Jessie's numbers weren't too good. Hope he doesn't go home and take it out on my car. That's been an ever increasing in lenth project if there ever was one. I just started coming to this board last night. I was wondering if there were an other http://kyfbodies.org people on here. Well, see ya at the BASH. BTW that's about the same torque number my puney 305TPI ran but you got me in the HP department by about 20. Guess we'll have to line em up in a few weeks eh?

jms

iTrader: (1)

Hodge, welcome to this board. You'll learn a lot of useful information.

It would be nice to have several more thirdgens at the Beech Bend Bash on April 6 in Bowling Green, KY. The fourth gens are everywhere there.

Guys within three to four hours driving time would have a blast getting to run the snot out of their cars, drag and autocross.

They should check out our club site at www.kyfbodies.org shouldn't they Hodge?

How is that for a commercial?

Seriously, if any of the readers know who's idea it was to put that 'snap ring' (on the drum brake rearend of an '82 Z-28) that has to come off to get the wheel cylinder off, please beat him to within an inch of his life. Spent most of this afternoon trying to get a wheel cylinder off.

I had another idea on why my air/fuel ratio was so bad at yesterday's dyno test..

I have an adjustable regulator and it is set where it works best at the track.

Well, at the track, I'm getting a ram-air effect with my ram-air/cold-air set-up, where at the dyno all I got was hot air (as discussed above).

Perhaps the apr was too high for a stationary test? It is set at 48 lbs and 40 with the vacuum hose off and plugged.

jms

JAY87GTA

Yeah, that would definetly have an effect. If your using the o2 counts to set it or an a/f monitor then that's the way to go.