my car has 3.23 in it right now

I was told if I went to 3.73 I would notice a difference in take off

right now I am just barely eating stangs for lunch

but the 5.7 should walk all over a 5.0l stang


if I were to swap out for the lower gears would I really notice better street racing performance???

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1986 IROC 350 5spd
just installed a TPI from a 1988 IROC, 24# lt1 injectors,165 ECM MAF, custom sub frame

 

yes, i think you would benefit a lot more with 3.73s than 3.23s. I wouldnt do it because I would gain a tenth at most and its just not worth it for me. man your barely beating stangs? heh, i rarely ever lose to one, and when i do race them they are 3 car lengths behind me, and you have a 350. i have to check the #s on my block to see if i have a 350 or 305...i think i got an aftermarket 350 in my stuff.

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1990 G92 5spd LB9 - 3.42 80,000 miles

Accel Ignition/Wires (8.8mm), Advanced Timing, TB Bypass, Ported and Gasket Matched Plenum, Synthetic Motor Oil, 160 Thermo, TPIS Airfoil, K&N Air Filters, Centerforce I Pressure Plate and Clutch, Edelbrock TES Headers, Dual Cats, Edelbrock RPM Series Catback, Homemade Ram Air, Bosch +4 Platinum Plugs

14.4 @ 94mph w/2.0622 60ft (w/o headers and catback)

14.426 @ 96.19mph w/2.167 60ft(w/headers and catback)

Also newly modded w/o track times:

Holley AFPR, Underdrive Pulleys, KYB Shocks and Struts, Crane Ignition

 

V8power...i have a question for you...do you have any intake mods? If not there is NO need for 24# injectors...3.73's would be nice with the T5...hell even 3.42's would be a nice upgrade..

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Check out MyGTA Nicknamed:The Big Red Machine
***AOL IM ClarkeMustGoNow***
Moderator at www.transamgta.com
"What does not kill us only makes us stronger"

Tony

 

I dont have any thing as of yet done to the intake

but I will be Right now I have the injector constants set abit high to help lean out the engine and I have dropped the fuel presure abit

all in good time


so you think the 3.23 are useless and I should change them ? I have a buddy with a set of 3.73 and a locker I am really considdering it

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1986 IROC 350 5spd
just installed a TPI from a 1988 IROC, 24# lt1 injectors,165 ECM MAF, custom sub frame

 

i am not positive but what is the gearing limit to where our speedometers can no longer be calibrated? its either 3.73 or 4.11. i read it in a tech article on this board. also, your gas mileage will decrease significantly with 3.73's.
later

 

Your mpg wouldn't necessarily decrease, it all depends on the power band of your motor, and I just got 3:73's from 2:73's and haven't noticed a loss in mpg.

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'86 IROC
T-TOPS, TINTED WINDOWS, BRAKE LIGHT BLACKOUTS
GM GOODWRENCH 350
EDELBROCK TES HEADERS
3" Hooker CatBack w/Aero Chamber muffler
EDELBROCK 600CFM CARB.
KN AIRFILTER
ACCEL HEI DISTRIBUTOR
160* Stat
3:73 Posi
Rebuilt 700R4
B&M Megashifter, 5" Autometer Tach w/shift lite

 

i'm not saying 3.23's are useless...but you will definately notice more "get up and go" off the line with the 3.73's

 

I would first try and get you car running better. my stock 305 tpi auto 3.23 could beat stangs by more than a car. I think some thing is not right perhaps and most likely the case the stangs you are racing are not stock and claim they are like many do. I see more modded stangs than 3rd gens usually the thirdgens I see on the street at best have a chip and flowmaster while the stangs have H-pipe, flowmaster, cam and or gears 3.73-4.11 the ones that are usually crusing spray too. and of course the modded stangs eat the 3rd gens.

 

My car went slower with '73s. So I went back to my 23s. TPI don't need help off the line.

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1991 Firebird
350 L98 (was a 305 TBI),T-5,Edelbrock TES and cat back,Accel manifold
NOS,subframes,jegster torque arm,MSD Digital 6
AFPR,Lakewood lcas
Hurst linelock,SLP cam (206 212 .480 .486),relocated battery,cold air,Hypertech chip,centerforce df,clutch
poly bushings and mounts
AFR 190s
Harland sharp 1.5 rockers
autopower rollbar

12.33 @ 114.83 juiced uncorrected

13.510 @ 102 non juiced uncorrected

 

3.73s will greatly increase your times IF you can get traction. The L98 is a torque monster, and without some big slicks or DRs, you are going to get some problems. Also your crusing RPM at 80mph will be above 3k RPM.

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2001 Honda Civic EX 5-Speed
AEM CAI, Greddy Exhaust, DC Header, DC Strut Bar and Rear Tie Bar, APEXi VAFC, Nitto 450 Rear and 555R Front, and a secret.

15.726@84.8 mph BONE STOCK
15.122@88.6 mph NA Current
14.012@103.4 FI Current

Previously Owned: 96 Z28 A4

 

I know I might catch some hell for this, but I think 3.73's are an all around good gear for anything V8 RWD. I had them in my old LX, and now in my IROC.

There is another theory behind it too - typically, you want to be about 300-500 RPM past peak HP going through the traps for your best ET. But, 99% of us here drive our cars more than we race them. Pick a gear that suits your driving habits. My LX only lost 1 MPG going from 3.08's to 3.73's.

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1986 IROC, fully loaded, Mini Ram'd 383, Art Carr 700R4, Accel DFI, 12 bolt rear, etc, etc......

 

had 4.11 on my 71 camaro real nice for driving street though I was getting bad mpg. somethingl ike 8-11 mpg. this was with a destroked 400 SBC, and a TH 350. never again. I would say the 3.73 would be nice though.


right now my other car is running 4.1 and I am thinking of dropping in some 4.88 opr 5.12 now that would be nice for me :-D

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