I want to take a poll of what mods made what difference, and what mods were worthless.

I'll get it started by:

JET AFPR, Corvette Servo = .3 faster in the 1/4 mile.

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


ASE Master Tech + L1
Savannah, GA

'87 Trans Am
S/D TPI retrofit including functional PassKey, 22# injectors,
JET AFPR, Ported Plenum,
TB Coolant Bypass,
SSM SFC, Boxed LCAs,
8mm Accel wires,
Flowmaster Exhaust,
16" GTA rims,
Corvette Servo,
KYB Shocks
-->14.97 @ 94.9 MPH<--

'97 Bonneville SSE

 

Better yet, I threw together an online poll so I could better track the results. Please click below to take it:

Online Poll

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


ASE Master Tech + L1
Savannah, GA

'87 Trans Am
S/D TPI retrofit including functional PassKey, 22# injectors,
JET AFPR, Ported Plenum,
TB Coolant Bypass,
SSM SFC, Boxed LCAs,
8mm Accel wires,
Flowmaster Exhaust,
16" GTA rims,
Corvette Servo,
KYB Shocks
-->14.97 @ 94.9 MPH<--

'97 Bonneville SSE

 

GMtech
How does the vette servo improve 1/4 et. I just paid some crazy cash ($1600) to rebuild my tranny, which included a new vette servo among other things. What et reduction can I expect from this mod?
Thanks, Rick

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'88 GTA 350
Headers, catback, free mods, Xtreme energy cam, and intake pieces
13.51@104.27, but can run better as it is.

New 2100-2300 RPM converter is in. Hoping for 13.30 or better.

 

Everyone on of the major mods I did, the headers, cat-back and performance resource chip all did great for my car. The headers were worth .5, the cat-back was worth about .3 and the chip was .2 off in the 1/4.

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission with 2.77:1 Rear End

Current Mods: Edelbrock TES 1 5/8" Headers, Hooker Aerochamber Cat-Back System, Performance Resource Chip with 160* Thermostat, Accel Ignition Components, K&N Filters, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET : 14.32 @ 97.7mph
(corrected for elevation)

Soon to come: LT4 HOT Cam, Air Flow Research 190cc or 195cc Heads, 2800 RPM Stall Converter and SLP 3.70 Rear End Gears.

 

I don't know if it did or not, I did the servo when I did the AFPR. I imagine my AFPR helped out the most, but the tranny does shift quicker, which may shave .001 (whoop) seconds off in between shifts.

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


ASE Master Tech + L1
Savannah, GA

'87 Trans Am
S/D TPI retrofit including functional PassKey, 22# injectors,
JET AFPR, Ported Plenum,
TB Coolant Bypass,
SSM SFC, Boxed LCAs,
8mm Accel wires,
Flowmaster Exhaust,
16" GTA rims,
Corvette Servo,
KYB Shocks
-->14.97 @ 94.9 MPH<--

'97 Bonneville SSE

 

So GMTech, are you saying the Corvette Servo is not realy worth the effort?

 

ported plenum EGR walls, and shimmed (using a quarter) fuel pressure regulator: .3

The 5psi jump in fuel pressure made a BIG difference, and combined with the extra airflow through the plenum, it made a DEFINITE seat of the pants difference as well.

This may sound odd, but keeping the car cool in the staging lanes was perhaps the largest seat of the pants 'mod' (lol) I ever did. The difference between a 230 degree heat soaked engine and a cool 160 degree one is at least a half second.

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

supposed 'peanut cammed' car (yeah, right)

Built on Wednesday

 

BFG Drag Radials were worth .4 over my crappy street tires.

SLP 1 5/8" headers were worth .25 over stock manifolds.

ZZ4 heads and cam were worth .8 over stock heads and cam.

Ram-Air was worth .3 (added to the .8 above)



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1991 Camaro Z28
5.7L 5-Speed (originally 305)
13.25 @ 107.18 MPH
Southern California
Member: SoCal 3rd Gen F-Bodies
Webmaster: SoCal F-Bodies
-=ICON Motorsports=-

 

Changing from 2.73 to 3.42 gears knocked off .4 and gave me 6mph, and that is feathering the throttle bigtime off the start. Traction would knock off another .4 pretty easy.

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87 IROC 350, 3:42 Torsen
13.94@103mph, 2.25 60'
Stock cam, chip and trans
In the works: ported SLP runners, ported base, Xtreme Cam, homemade suspension pieces, and 27x10 Hoosiers.
Hoping for 12.999

 

Underdrive pullies = .0 improvement.
1 5/8 headers switch from 2.77 to 3.23 gears = .5.
(most of the gain from the gear swap)
AFPR on stock engine = -.1 (at least on mine it liked the stock setting best).

Bumping timing from 6 BTDC to 10 BTDC = .3 (on my car)

A friend of mine's '96 TA M6 picked up .9 changing gears from 3.42 to 4.10 (high 14's to hi 13's).

Don't know about free mods, did them while rebuilding my engine.

Sparks a flyin'.

 

From a G-tech
stock 14.4@97
plugs,wires,coil,oil,T-body bypass,pulley,therm.,chip,AFPR,portedplenum,runners,flowbooster,cold air
13.8@102
torqueconv.,shiftkit,catback
13.6@104



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1990 Trans Am GTA
Bosch plat+4 plugs,SLP plug wires,Hypertech coil kit,Fastchip PROM,SLP 160 therm,T-body bypass,SLP crankpulley,Breathless AFPR,,ported plenum,SLP runners,SLP flowbooster,SLP cold air,K&N,SLP 3"catback,SLP torqueconverter,SLP shiftkit,Mobil 1
14.3@96 stock
13.5@102 w/mods

 

I must tell you that is one happy G-Tech!



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'88 GTA 350
Headers, catback, free mods, Xtreme energy cam, and intake pieces
13.51@104.27, but can run better as it is.

New 2100-2300 RPM converter is in. Hoping for 13.30 or better.

 

Basically stock L98 in my 89RS.
14.0@96mph before pullies
13.81@98.96mph after the pullies.
Same track, same weather.
Aftermarket TPI intake, BIG seat of the pants improvement, but no times to prove it.

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Rob P
89RSconvtZZ4TPI
92Z28convt5spd
71Impala convt 402BB
BETTER DRIVING THRU SUPERIOR HORSEPOWER!

 

Car = 1990 IROC 350. Mods = gutted airbox w/ K&Ns, Big Mouth intake, AS&M SSLTRs, P-Plenum, 52mm TB, SLP 1-5/8" headers, Flowmaster Force II catback, gutted converters, 3.73s, 1.6 rockers, pullies, ignition.

Dog-**** slow for the above mods = 13.8@101mph

Addition of Random Tech Ram-Air = 0.1 and 1mph (to 13.7's@102mph)

Addition of AFR Heads and CC Xtreme 218/224 112LSA cam = 0.7 and 5mph (to 13.0@107.2mph)

Addition of PI Vigilante Torque converter = 0.5 and 1/2mph (to 12.58@107.9mph)

Addition of MiniRam, 30lb injectors, and tuning = 0.05 and 2mph (to 12.52@110mph)

Remove front sway bar, passenger seat, STB, front skinnies and then go to a track that is AT sea level and not below sea level = 0.3 and 2.5mph (to 12.24@112.x)

Tim


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TRAXION's 1990 IROC-Z
Best Time = 12.244 @ 112.51mph (1.778 60' / 7.819@88.32mph in the 1/8)
All Natural. No Force. No Drugs. Stock Bottom End. Stock Body Panels.
Gunning for NA 11's after installing Hooker LT Headers and reducing weight.
-=ICON Motorsports=-
Moderator: PROM board at thirdgen.org

 

Stock=15.4@???

plugs, wires, cap/rotor, tb airfoil, k&n filter=14.9@94mph


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http://www.members.tripod.com/~btessier

88 GTA
L98 350
700R4
3:27 axle
MODS,
Edelbrock TES headers, 2.5" straight pipe, Flowmaster 80 series, K&N filter, Accel 8.8mm wires, Bosch Platinum plugs, Wells cap and rotor button, Wells ignition module, MAF screens removed, Hypertech TB air foil, Thermomaster stage II chip, 180* Powerstat, Hypertech cool fan switch, B&M shift kit, B&M power clutch pack, B&M servo, GM fuel filter.

[This message has been edited by speed88 (edited November 28, 2000).]

[This message has been edited by speed88 (edited November 28, 2000).]

 

BTTT

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1987 Chevy Camaro IROC-Z
L98 TPI 350 (5.7L)
TH 700R-4 Transmission with 2.77:1 Rear End

Current Mods: Edelbrock TES 1 5/8" Headers, Hooker 3" Aerochamber Cat-Back System, Performance Resource Chip with 160* Thermostat, Accel Ignition Coil, Cap, Rotor, 8.8mm Wires, K&N Filters, JET TPI Air Foil, All Free Mods, Falken ZIEX Z-Rated Tires.

Best ET : 14.32 @ 97.7mph
(corrected for elevation)

Soon to come: LT4 HOT Cam, Air Flow Research 190cc Heads, 2800 RPM Stall Converter and SLP 3.70 Rear End Gears.