Here is the deal: I was tested by gtek to have 248 bwhp and running 14.02 at 102.5 mph. This was with my 190 lb friend in the car and driving to the destination for half hour, as well as the trunk not allowing me to close it . Does this sound right? I had a great little 700R4 built for me with a shift kit, corvette servo, 1800-1900 stall converter, and a new high performance catalytic converter. The rest of my mods are a ZZ4 motor, (with stock tpi), edelbrock headers, flowmaster, chip, k&n, gutted airbox, tb coolant bypass. I also have 2.73 gears. I'm concerned about the time because I did some of these changes (the minor ones, excluding the tranny rebuild) after I ran a 13.6 at the track last year, but that was on Nitto's. Should I run faster (mph) without my friend in the car too? Help!

 

well your friend probably cost you .19 seconds. The Gtechs are a little off also. I cant believe you are running such a modified car and only running 2.73 gears. our car will seriously wake up if you swap those out for lower ones.

 

My ZZ4 was carbureted ('68 El Camino) and had a lot more Hp and rpm potential then your TPI setup does. My setup was nearly optimized with 3.73 gears and 2500 stall. I would suspect that your car would work well with 3.50 gears and 2200 stall. If you ever open up your intake flow you will want to get a little more aggressive like my setup was. Keep in mind this is simply an estimate on my part based upon past experience but it's probably a great place to start.

 

Yeah, you need to do something. My TPI'd LG4 runs 14.5s w/ stock LG4 Heads and Cam.

They also say that every 100lbs cost you .1

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'87 Trans Am
S/D TPI retrofit including functional PassKey,
22# injectors,
Whatever chip I feel like burning,
JET AFPR, Ported Plenum,
TB Coolant Bypass, Custom Cold Air,
SSM SFC, KYB Shocks, Boxed LCAs, Wonder Bar,
8mm Accel wires,
Flowmaster Exhaust,
16" GTA rims,
Corvette Servo,
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'97 Bonneville SSE

 

I'd port the plenum and runners, get a bigger TB, and a Big Mouth lower intake.

Your stock TPI is whats holding you back.

My car has far less mods and I'm running consistent 14.0's at 100 with a best of 13.98 @ 100.

Just get it all dialed in.



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Mike L.


1987 IROC Z TPI 350 A4 3.27 Borg-Warner.

Mods: 2300-2500 Stall Converter, Shift Kit(GM parts), TPI Specialties Stage 3 PROM, Modified Airbox w/ K&N's, Relocated MAT sensor, Gutted MAF, Accel 8mm Wires, bypassed TB coolant, Flowmaster 3 chamber single 3" in/out muffler, airfoil, Random Tech Hi-Flow Converter (soon to go byebye!). ALL STOCK otherwise.
http://www.MichaelLasiuta.home.att.net

**BOYCOTT LAPEER DRAGWAY**

 

i agree higher rear gears and bigger tpi system will show you tremendis gains. your zz4 is being held back a bit b/c of the stock tpi systemq

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91 camaro RS
- 305 TBI
Mods: Performer TBI intake, 1" TBI spacer, K+N, jet fan switch ,160 thermo,Accel control module, Jet Stage 2 chip, edelbrock TES headers, Compleate 3" Flowmaster exhaust, Edelbrock springs, KYB struts and shocks, 700R4 built by TSI, SLP tq converter, b+m trans cooler, white guage faces, megashifter..
next month: spohn LCA's and panhard rod, BMR relocation brackets, 323 gear

 

10lbs equals 1hp , so every 10hp is .1 sec? so if i lost 1000lbs(car not me) i would increase my e.t. by a full second? wow

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1991 RS LO3

RACECAR spelled backwards is RACECAR

 

A 100HP shot of NOS for my 4600 pound truck goes from 15.0 to 13.5. A 200HP shot won't make it run 12.0. Maybe 12.3's.

You can only remove so much weight from a car but it's all a matter of power to weight. A 500 HP, 3000 pound car can run 11's. A 200 HP, 1200 pound dragster can also run 11's. Ever see a 6 cylinder dragster run 8's?

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87 IROC-Z SuperPro ET Bracket Race Car
461 naturally aspirated Big Block

Best ET on a time slip: 11.242 altitude corrected to 10.69
Best MPH on a time slip: 121.52 altitude corrected to 127.76
Altitude corrected rear wheel HP based on power to weight ratio: 504.5
Best 60 foot: 1.546

Racing at 3500 feet elevation but most race days it's over 5000 feet density altitude!
Member of the Calgary Drag Racing Association

87 IROC bracket car, 91 454SS daily driver, 95 Homebuilt Harley

 

i'd have to agree in saying that your intake is choking you, by design(stock tpi) its done making power while that ZZ4 is still making power. my car ran a 14.12 @96(2.02 60 ft) with a tpi and broken TPS sensor. also g-techs are usually a couple of mph fast since they measure mph at the very end of the 1/4 rather than the last 60 ft measurement the tracks use.
try running around your block as fast as you can with a leadbelt on while breathing through a straw...you know how how your car feels

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87GTA ,10.5:1,4-bolt 355,afr 190's, super ram ,stock poerted base,58mmTB,24 lb FMS inj. ed wright chip, .510/230 (nr) 1&5/8 hooker shorty's, flow master single 3", 2800 ameri-torque non lk-up, 3.73. best to date with stk 48mm tb and lack of traction in 1st gear netted me a 12.9 @110mph /91 TA daily driver LB9 A4 2.73,

 

LOL good analogy

 

easiest way to explain it ... io guess
hey dont feel bad bro.. my first time at the track i ran a 14.12@96 w/ a 1.780 r/t and broke 10 rocker arms .... whoo da man !

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87GTA ,10.5:1,4-bolt 355,afr 190's, super ram ,stock poerted base,58mmTB,24 lb FMS inj. ed wright chip, .510/230 (nr) 1&5/8 hooker shorty's, flow master single 3", 2800 ameri-torque non lk-up, 3.73. best to date with stk 48mm tb and lack of traction in 1st gear netted me a 12.9 @110mph /91 TA daily driver LB9 A4 2.73,