Hey guys, Do everyone think that this is a good start to a Basically stock lo3 Iroc-Z?
I have a Flowmaster 80 series Muffler and an open element air filter. Just want to know If i am heading in the right direction to hit MID 14's. Thanks alot everyone!

 

3.42 is the ticket for you right now IMO

 

3.73's are the answer according to math and the track. 3.42's will help but won't get everything out of the car like the 3.73 will. it's worth another tenth easy.

lata
tim

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91 Camaro RS-LO3,Auto.
14.215@94.30 w/ 1.917 60'

Check Out The East Coast F-Body Nationals Home Page
www.geocities.com/njspeeder

My MAFB.ORG Home Page
www.mycar.net/mafb/registry/detail.cfm?id=299

DSI Racing Home Page

www.geocities.com/foff667

 

3.73s are only worth a tenth vs. 3.42s?? wow...thats surprising.

i am getting 3.73s within the next couple weeks...NJSPEEDER is right...they work out math wise to get you down the 1/4 in the best time.

but it depends on other stuff in your setup..is your car an auto or a 5-speed? what mods have you done? what do you want to rev the engine to? things like that.

-brian

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1991 Camaro RS - ultra blue metallic, t-tops
GMPP 350 HO crate engine - TBI, MSD ignition, SLP exhaust
700R4 - 2,400 stall converter, vette servo
10 bolt - coming soon - SLP zexel torsen differential, GM 3.73s
z28boy.fbody.com
z28boy@twcny.rr.com
AIM - "Z28 Boy"

 

You will actually feel the difference that the 3.73's in the seat of your pants more than probably any one other mod. Do yourself a favor and do the gears before any major engine mods like cam, heads, etc. High gears will make even a strong engine feel weak and gears will make a weak engine feel stronger.

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82 Z28 350, Ported #882 Heads, Performer RPM cam and intake, hedman headers,650 Demon carb,
Trans: Turbo 350 w/ 4000 stall -- Rearend 7.5 w/ Richmond 4.10's, Auburn Minispool
Best ET: 12.52@107.2
Future plans: Dart headed, Roller cammed 383 in early '01


89 RS, L03 305, Hypertech Chip,cat delete, Dynomax exhaust,K&N open element Filter,160 stat, MSD coil --Trans:700R4 Corvette Servo -- Rearend: 7.5 GM 3.42 w/ posi-lock
New Best ET: 14.91 @92.9
Bassett Racing
Mid Atlantic F Body -82 Z28 Page

R.I.P. Dale Earnhardt #3

 

I've had my 3.73's for about a month. MASSIVE DIFFERENCE First gear makes you glad you have a seat back, along with breaking loose on a pretty much stock LO3 in the 1-2 shift with an auto.

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'92 Firebird 305 TBI
3.73 Posi
ASCD Ram Air Hood
14X3 K&N
'00 WS6 Exhaust

 

ya 3.73s are great in a 5 spd. I have had mine for about 700 miles and the difference from the gears is incredable.

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1989 pontiac firebird
bright red exterior(just repainted)
grey interior
5 spd
305 TBI (stock)
WS.6 formula wheels
3.73 posi rear end
http://members.aol.com/j007golden/Mikey89.html
-------------------------
1985 trans am
factory bright yellow
4 wheel disks
16 inch wheels
305 TPI
power antenna and mirrors
t tops

 

WITH 373 YOU LOOSE TO MUCH TOP END AND PROBALLY ONLY BEABLE TO GO AROUND 80 MILES PER HOUR

 

LOL. I've been in third gear at about 90-95, near red line. I figure by the equations on the main page, that the top speed with 3.73's is about 120-125 with a 700R4. For me, I don't go all out much, so I wanted the better off the line performance.



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'92 Firebird 305 TBI
3.73 Posi
ASCD Ram Air Hood
14X3 K&N
'00 WS6 Exhaust

 

nun,
how do you figure that? i have heard people say this before and i would really like to know what the thinking is.
the way any person should select a gear is to figure it from what their mph is in the traps at the big end. then you choose a gear that will make that speed as close as possible to the rpm of your peak hp.
in any car of ours the highest gear you will hit on the track is a 1 to 1 ratio (3rd in autos and 4th in 5spds). that works out to a 3.73 being the best gear at least until you do a cam, which is really the only way to change the position of the powerband enough to possibly demand a new gearing.

lata
tim

------------------
91 Camaro RS-LO3,Auto.
14.215@94.30 w/ 1.917 60'

Check Out The East Coast F-Body Nationals Home Page
www.geocities.com/njspeeder

My MAFB.ORG Home Page
www.mycar.net/mafb/registry/detail.cfm?id=299

DSI Racing Home Page

www.geocities.com/foff667

 

Since we're on the subject I might as well ask a few opinions on rear ends. My current setup is going to be the 350ho with the peg leg 3.08 rear with auto. I was looking at the 12 bolts but they are over 2K for a ready thirdgen setup and that's a lot for a college guy. I plan on doing a cam swap to be making 380hp and 420 ft-lbs and then getting a much higher stall converter. I'm thinking I'm going to have to keep the stock rear end unit so I figured I'd get a girdle/brace, locking diff from powertrax, and 3.42 gears. Do you guys think the 3.73 gears would be a better choice? I will need the car for highway driving and even a few 540mile drives where 80mph is the norm.

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, Jon (91 RS too many mods to list)