Ski89Z28

Well what do you guys think?
Everyone tells me "NO WAY" but I think it can happen.
I'd like to try and if you guys got any info or done it or seen it done could you please let me know.
Yea in time I'll switch to a moser 12 bolt with better gears but till then I'm stuck hear.

Thanks!

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89 IROC 350 Auto
MSD 6AL
Custom DUAL Exhaust
Edelbrock Performer 6085 Aluminum Heads
ZZ9 Cam
TPIS Level 5 Chip
And Free mods.
(stock intake, runners and suspension)

13.879 @ 98.90 mph (with 2.77 gears!)


Moderator of http://www.iroczone.com

Member of JFA Crew

AlkyIROC

You just need lots of HP. When I had my 383 I ran 11.8's with 3.27 gears.

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Follow my racing progress on Stephen's racing page
and check out the race car

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

Best ET on a time slip: 11.242 altitude corrected to 10.89
Best MPH on a time slip: 121.52 altitude corrected to 125.89
Altitude corrected rear wheel HP: 497.9
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

88 427 Camaro

I've gone 12.18 with 3.27 gears. Just installed 3.73's (still a 9 bolt) and dropped about 350 lbs from the car. Will see how that does in a few weeks.

Miles

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88 427 Camaro
12.18 @ 113mph 1.75 60ft
Currently installing 3.73's into my 9 bolt (YES,it is a 9 bolt & YES they are 3.73's, not 3.70. 4.11's to follow soon )
www.koolmeister.com

Daz

iTrader: (1)

Miles,

Is it OK to get info about your 3.73 in a 9 bolt project??

Daz

NufNuffZ28

iTrader: (10)

Ski89Z28

Any pics of your exhaust. I want to do that also with my Hooker Super Comps. Who did it? Ground clearance problems?


Thanks

Jay

iTrader: (2)

Daz -
don't know if this is what he is using or not, but TPIS just started selling 3.73 gears for the 9 bolt. Check out the new products on their website.

88 427 Camaro

TPIS is actually selling 3.70 gears ie 37/10 not 3.73 ie 41/11. The 11 tooth pinion on the 3.73 is stronger than the 10 tooth pinion on the 3.70. I will also have a variety of gears available from 3.2 to 4.1 along with new carriers and some other stuff. If you want to know when parts are available, send me an email and I will put you on the mailing list. Right now, it looks like some of the 4.1 gears and carriers will be ready next week.

Miles

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88 427 Camaro
12.18 @ 113mph 1.75 60ft
Currently installing 3.73's into my 9 bolt (YES,it is a 9 bolt & YES they are 3.73's, not 3.70. 4.11's to follow soon )
www.koolmeister.com

Ski89Z28

NufNuffZ28

You ask for some info on the exhaust I have so I'll tell you about it. It is a custom exhaust put on by a custom exhaust shop. I have to stay in emmision legal status so I have 2 cats and 2 mufflers one on each side or pipe. The pipes are 21/4" each and they follow the standard layout of the regular exhaust. My 2 cats are cheapo's from J.C.Whitney and fit under the same spot the regular cat would fit. I just need to put more insulation under the carpet on the passenger side since the wife says the floor get too warm in the summer time, hehe. Then both pipes run next to the driveshaft to the rear axle and over it. Then I have one pipe on each side of the gas tank. The mufflers are small cylinder types right before the bumper and next to the gas tank sides, not too close you know.
I've calculated it out that the 21/4" pipes flow just a little more than a 3" cat back system so I'm good to 350 -375 HP.
The sound is totally different from a cat back system and is a very deep rich sound, I think it can be compared to and Big Block sound, but that is me and I think the cam helps too. When I go WOT it is nothing less than LOUD so I don't do it too often and never around cops. The cat back systems gives and equal sound out of each tip but with mine and the cam it is lopey and you get the alternating sound coming from each pipe.
Some people say that with all the bends I'd have flow problems but no, plus all bends are manderal(spelling) bends. It takes a little while for the O2 sensor to get hot enough to put the car in close loop in summer time and really long in winter time, I can see the rpms change back and forth as it goes into close and open loop. But it does go into closed loop and stay there!
Also idling through parking lots I have been know to set of a few alarms and chrips from cars.
If I can get a digital camera I'll try to put the car up and take some pictures else I'll have to use my 35mm and send the pictures in a week or two. Ok?
Anything else you need let me know.

Please send me your email address cause the one you have listed didn't work.

Mike Ski


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89 IROC 350 Auto
MSD 6AL
Custom DUAL Exhaust
Edelbrock Performer 6085 Aluminum Heads
ZZ9 Cam
TPIS Level 5 Chip
And Free mods.
(stock intake, runners and suspension)

13.879 @ 98.90 mph (with 2.77 gears!)


Moderator of http://www.iroczone.com

Member of JFA Crew

88blkiroc

im hitting 13.8s on 2.77's i imagine with heads, cam, and a bigger TPI or superram style intake it could be done.

Ski89Z28

88blkiroc, what mods do you have?

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89 IROC 350 Auto
MSD 6AL
Custom DUAL Exhaust
Edelbrock Performer 6085 Aluminum Heads
ZZ9 Cam
TPIS Level 5 Chip
And Free mods.
(stock intake, runners and suspension)

13.879 @ 98.90 mph (with 2.77 gears!)


Moderator of http://www.iroczone.com

Member of JFA Crew

Like a ROC 89

I'm hitting 14.0 at 98.93 with a 2.16 60ft with 2.77 gears in an '89 IROC 350 AUTO. All I have is headers, catback, no cat, coil, k&n's, ARAP chip, AFPR, and ported plenum. Stock intake, heads, cam, runners and suspension. I definately feel she had a 13.9 run in her......... I just got to work on those 60ft times with my street tires.

five7kid

iTrader: (14)

Agreed. About the most amazing thing I've ever seen was back in April - took the day off for testing @ Bandimere, pitted next to a guy with a '63 Ranchero (okay, okay). This guy was in his early 70's, had the car since 1971, been tinkering with it ever since. Car weighed 3300 lbs, he drove it to the track; turbo/intercooled 351, progamable EFI, manual body C6, 2.59 gears! 1st run was an 11.9. Since he didn't have a cage in it, he was trying to dial it down, still below 12.0, so made some runs starting off in 2nd - then he was running his 12.05's. Told me it dyno'd over the winter 750 lb-ft @ 3300 rpm.

Yep, all it takes is power.

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82 Berlinetta, orig V-6 car, now w/86 LG4/TH700R4. 2.93 limited slip. Cat-back from '91 GTA, ZZ3 intake, Accel HEI SuperCoil. AMSOIL syn lubes bumper-to-bumper. Daily driver, work-in-progress (LG4 w/'87 LB9 block, ZZ3 cam, ported World 305 heads, Hooker headers & y-pipe, 3" Catco cat & 3" cat-back).
57 Bel Air, my 1st car. '66 396, 9.7 CR forged TRWs, Weiand Action+, Edelbrock 1901 Q-Jet, GK 270 cam, Magnum rockers, Jacobs Omnipack, 1-3/4" Hedders & 3" Warlocks, TH400 w/TCI Sat Night Special conv & Trans-Scat shift kit, MegaShifter, 3.08 8.2" 10-bolt w/Powertrax, AMSOIL syn lubes bumper-to-bumper. Idles smooth @ 600 RPM in D. Best 15.02/95.06 @ 5800' Bandimere (corrected 13.93/102.4 @ sea level).

BOWTIROC

If you have a machine shop make you a 1/4 inch ring gear spacer, you can run the 3.70 gear ratio for the "3 series carrier" in a "2 series carrier". If you have any questions, let me know.
-Brit

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Black 89 IROC...355, Solid Crower Cam, TFS heads.
12.0 @ 120.3mph with a 1.9 60ft...all motor

Jason Aschle

13.4 e.t is my best with a 2:77 ratio and that run was with a 2.24 60' time , 104 degrees out, on drag radials, stock lower control arms and torque arm. I think that with better suspension, a set of slicks and good weather, I would have reached the 12 second goal. I have since swapped in a set of 3:70 gears, so I will never know what the 2:77 could have done...

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1991 Camaro RS/Z28,polished TPI, 355ci. Sportsman 11 heads, LT-4 Hot cam,Pete Jackson gear drive, on,and on, and on... 13.4 @ 105.98 with a 2:77 rear, no traction, no tuning, no practice. Car is pictured in Chevy High Performance magazine, June 2000 issue.
http://www.geocities.com/jasonsz28us/INDEX.htm


1997 GMC Yukon, 4 wheel drive, leather, loaded, Gibson exhaust, K&N intake, Boston pro series speakers..... That's it so far.

1969 Camaro,12 point cage, total project right now, I am planning an LS1 - T56 - and a Vette independent rear. Pro Touring crowd, look out! 8^)

ATOMonkey

If you can get enough engine that you only use the first two gears, then I think it's possible.