Well my Gtech is pretty accurate, I know because all my friends have used it and it seems to be pretty consistant and matches out marked-out 1/4 mile. Anyway, I finally got around to using it in my car. I knew it wasnt going to be good, but this shocked me. Four seperate runs later, my best was 15.3@96mph. This was slowly launching the car and then hammering it to avoid wheelspin. My car& mods are in my sig, but this makes all TPI cars look pretty bad when my friends 95 Monte Z34 is faster. Sigh.

------------------
'83 Firebird 2.8
'89 Firebird Formula 350
Red/grey, t-tops, and a 3.27:1 rear
K&N, TB bypass, no MAF screens, CAI, full Accel ignition, no cats, Hooker Supercomp shorties, Hooker 3-inch catback
No real ET yet...

 

96 MPH isn't bad at all. It's right around where you should be. It corresponds to about 14.3 in the 1/4 mile. But the GTech trap speeds are usually about 3mph too high.. maybe your car is a little out of tune.

------------------
91 Trans Am WS6
Bright White
5.0 TPI auto
Flowmaster 3" 2 chamber catback
Trans Go shiftkit
2000 stall converter

Built on Wednesday

[This message has been edited by MrJ (edited April 29, 2001).]

 

Something is definatly wrong, my car runs better than that, I have a funky LG4 (see sig). I never did anything w/ the heads, cam, exhaust manifolds. I have run at the track, and w/ a GTech, and my times are consistant up to .1 and 4MPH wich is pretty damn good for only plugging into a cigarette lighter.

------------------
If you live in Southeastern US, check us out!
South East Thirdgen

GM Master Tech
ASE Master Tech + L1
Savannah, GA

'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,
-->14.97 @ 94.9 MPH<--

'97 Bonneville SSE

 

Yep, GTECH is very accurate. I too know many people that use it on the track as well and they get the same et. But higher mph usually by 3mph-5mph. Actually, gtech gives you the ACTUAL mph. The drag strip is an estimate.


Maybe your traction sucked? If you really want to get good traction pick up a bottle of VHT and pour it all over the street first

------------------
91 Formula 1LE 1 of 46
305 TPI 5speed
1LE/G92/WS6

Paxton SN92 supercharger(SN93 upgrade), Ford SVO 24#injectors, Crane AFPR,SLP airfoil, ported/polished plenum, March alt. pulley,Crane Gold 1.6rrs,MSD coil,MSD6AL (5200rpm limit),Holley 9mm wires,Ac delco R43ts plugs,custom chip,Bosch O2sensor,SLP 1 5/8" headers,SLP catback,shortened shifter,3:73s w/Auburn posi,170* t-stat,JET 195* fan switch, Macewen white face gauges, Autometer gauges, Zoom hi-performance clutch.

 

you should be running better than 15's

------------------
89' Firebird Formula WS6 L98,AFPR, MSD 6AL, MSD Blaster, Hypertech chip, K/N filter cone(no air cleaner box),flowmaster 80 series, hypertech air foil, modified MAF, ported plemum, koni shocks, edelbrock trailing arms, EdelBrock Panhard bar, subfame conectors, March Pulleys, Jet fan switch,Throttle body bypass, BFG drag radials, Edelbrock strut tower brace, 3.27 posi rear, B&M deep tranny pan, B&M Shift kit...

 

MAke sure you set your weight properly. www.3rdgenformula.net (I think? Might be a .com or.org) has a weight table of stock weight for all the Firebirds made in third generation. I can't see how that would effect the G-techs interpretation of your 1/4, but it just might. Also, were you going on a slight uphill at all? Or even downhill can mess up the gtech, need to be very straight and level.

-Reno

------------------
89 Formula

 

The G-Tech does not take into consideration weight, it does not need to. It uses a state-of-the-art accelerometer, the same ones used in Inflatable Restraints (air bags) and Aviation.

It also measures for being level. If its out of range, it will tell you.

------------------
If you live in Southeastern US, check us out!
South East Thirdgen

GM Master Tech
ASE Master Tech + L1
Savannah, GA

'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,
-->14.97 @ 94.9 MPH<--

'97 Bonneville SSE

 

Just to give you an idea, my 89 formula L98 with less mods than yours runs 14.6-8 @ 98/99mph gtech time. These runs were with an airfoil, dynomax catback, afpr, that is about it, not real good traction either. My IROC, before I sold it, was hitting 14.0 @ 110 with major traction issues - this car pulled a LS1(stock of course) so I would suspect my specific gtech mph was within 3-5mph, I wonder how much variance there is among different gtech's in mph. I do all my runs on the exact same flat road so it is an accurate meaure for my car as I do more mods.

 

Like Bill and Ted say, "Strange things are afoot at the Circle K."
My 92 Z28 305TPT 5spd 3:08 ran 14.21 @ 96mph.
Trap speed indicates a better ET.
Heck, my 89RS with a 92 L98 ran 13.81 @ 98.96mph.
You have more there.
...p.s.
These are actual track times, not g-tech times.
Maryland International Raceway (MIR).
Nice track and sea level!
------------------
Rob P
89RSconvtZZ4TPI
Edelbrock Hi-Flow Intake
SLP Dual Cold Air Intake
1 5/8" Headers
Semi-Siamesed Runners
MSD6AL/relocated MAT/ AdjFPR/IROC frnt@rear swaybar/wonderbar/steeringbox/alum drvshaft/ Alston SFC/3:23posi disc rear/MAC LCA/H.Adams Panhard Rod/KYB struts/ shocks/
92Z28convt5spd
71Impala convt 402BB
BETTER DRIVING THRU SUPERIOR HORSEPOWER!

[This message has been edited by Rob P (edited April 29, 2001).]

 

Well I just replaced all the wires today, I had suspected some of them had heat damage from the headers. They did, I fixed em and now the car runs a hell of a lot better than it did, it pulls very hard through first and second, but in third and fourth, it seems to develop what feels like a miss. Car kinda lunges and bucks slightly. I dunno, I suppose Ill have to experiment with it some more.

------------------
'83 Firebird 2.8
'89 Firebird Formula 350
Red/grey, t-tops, and a 3.27:1 rear
K&N, TB bypass, no MAF screens, CAI, full Accel ignition, no cats, Hooker Supercomp shorties, Hooker 3-inch catback
No real ET yet...

 

GMTech: 14.9@94.5MPH? That car is a freak! It's the equivalent of an 86-89 305 TPI and it's pulling the trap speed of a 350 TPI car with 3.27s.

------------------
91 Trans Am WS6
Bright White
5.0 TPI auto
Flowmaster 3" 2 chamber catback
Trans Go shiftkit
2000 stall converter

Built on Wednesday

 

My LG4 powered 86 Trans Am runs 14.94@91.67 in the 1/4.
I have just a few mods on the car, and the motor and drivetrain have 140+K miles wihtout a rebuild.
I also have a 5 speed, don't know if that makes that much of a difference.

------------------
Zepher
'86 Pontiac Trans Am WS6, LG4 305, 5 Speed, CF DF Clutch,
Edelbrock 1406 Carb, Edelbrock Performer RPM 7101 Intake Manifold.
Edelbrock Open Element Air Cleaner: Flowmaster Exhaust, 160* Thermostat,
Grant GT Steering Wheel, MSD HEI Coil, Taylor 8mm Wires, Leather 96 Camaro SS Seats,
Alpine CD+Changer,Alpine V12 Amps, Premier TS-1040C Subs, Polk Audio highs/mids.
Best ET: 14.94@91.67
High Speed Run: 157mph
WS6 Trans Am

 

My 1990 Iroc with 305 TPI 5 speed and 3.42's has pulled a best of 14.7 at 96 MPH here in Indianapolis. The trap speed and ET should be higher because my transmission is srewed up at this time. That's about to change this week though.

 

I'd suggest you take your Gtech to the track and check it against the traps before putting absolute faith into it.

"Never trust it until you can validate it"

------------------
Daniel Burk
http://www.isthq.com/~dan/fcar.html
'84 Trans Am WS6/L69
KB SFC, Moser axles, Torsen Diff. PST suspension, Braided stainless brake lines, Koni struts, 11-inch rear disks,Spohn Adj. torque arm,
Ported 305 heads w/1.94"intake valves, Comp Cams XE262H, Griffen alum. radiator,
Turbine Technologies 2500 stall converter, underdrive pulleys, Crane Hi-6 & more.
1.05g skidpad verified.
New best E/T! 14.039 at 100.82 MPH in 41 degree air at Stanton, Michigan.

 

MrJ, your correct. That time given was w/ a Gtech, but:

A) it was on a cold morning w/ a stone cold engine.

B) Gtech trap speeds, like I said, are usually about 1-4 MPH higher. I have verified this at the track.

Unfortunatly, since it was a GTech time, I will remove it from my sig. The best timeslip I could muster w/ a hot engine was a 15.2, which was still quicker, but w/ a trap speed of only 90MPH, I was not faster. Still damn good in my opinion for a stock LG4 longblock w/ stock LG4 exhaust manifolds/Y-pipe. I could probably duplicate the 14.9 at the track, if I let it sit for a few hours, and didn't have to wait in the staging lanes, but then again, everybody could shave a tenth or two if they did that, so I guess it don't count.


------------------
If you live in Southeastern US, check us out!
South East Thirdgen

GM Master Tech
ASE Master Tech + L1
Savannah, GA

'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,
3.73 Posi
4wheel Disc Brakes

'97 Bonneville SSE