LS1TECH - Camaro and Firebird Forum Discussion

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-   -   273's (https://ls1tech.com/forums/gears-axles/1608451-273s.html)

lrmneil Dec 16, 2012 09:07 AM

273's
 
Are any of you guys running decent times with the stock 273?

reeperz28 Dec 17, 2012 10:25 AM

No, cant wait to get rid of myne. I have a 2800 stall with 2.73 rear gear and the best 60 ft is a 2.1. Fpr as drivabilty with a aftermatket cam its hurting gas mileage but its highway mileage is phenominal haha.

Lt1Powerz Dec 17, 2012 11:08 AM

Im swapping out my 2.73's since i blew my rear end but they suck bad! No top end whatsoever.

justin hover Dec 18, 2012 04:10 AM

This just goes with your title..."suck ass" Everyone says track times hardly vary when doing a 2.73 to 3.73 swap. But it truly "feels" like you pick up a second. Daily driving is alot funner comparably from 2.73s to 3.73s and thats a fact.

Roarin_8 Dec 20, 2012 08:49 AM

With stock cam they did great with the converter (1.70 60'), with aftermarket cam, not so much, (2.4 60').

Here's the vid with the 2.4 60', run was a 12.5 @ 113

http://www.myspace.com/video/roarin-...ne-run/2633897

lrmneil Dec 20, 2012 09:39 AM

Nice thanks man.

lemons12 Dec 20, 2012 09:40 AM

Buddies setup.. 98 FULL weight trans am.. stock lid 273s etc etc
228r tsp cam
ptc 4000 converter
pacesetter long tubes, 2.5" x, 1 chambers dumped

untuned in fl heat it ran 11.8@114mph
In tn untuned before the cam it ran 7.7@88 in tn

Gears matter very little in stalled autos vs manuals.. I suggest a stock 342 rear if you feel the need to switch.
The actual et/mph gain from the two is minimal at best.

lrmneil Dec 20, 2012 09:45 AM


Originally Posted by lemons12 (Post 16993213)
Buddies setup.. 98 FULL weight trans am.. stock lid 273s etc etc
228r tsp cam
ptc 4000 converter
pacesetter long tubes, 2.5" x, 1 chambers dumped

untuned in fl heat it ran 11.8@114mph
In tn untuned before the cam it ran 7.7@88 in tn

Gears matter very little in stalled autos vs manuals.. I suggest a stock 342 rear if you feel the need to switch.
The actual et/mph gain from the two is minimal at best.


Nice I knew it could be done!

lemons12 Dec 20, 2012 09:54 AM

I've seen heads cam 323 cars cut 1.4 short times.

babbage1109 Dec 20, 2012 09:59 AM

Best sixty foot I ever got out of mine bolt ons full weight stock stall was 2.01 on street tires

lemons12 Dec 20, 2012 10:05 AM

You guys running street tires might as well not post up.

You aren't going to lose .7 in the 60' by changing to any cam either any gears, period.

lrmneil Dec 20, 2012 10:23 AM

Nice............

babbage1109 Dec 20, 2012 11:30 AM

Got the same sixty foot with slicks. so its relevant.

lemons12 Dec 20, 2012 01:59 PM

I cut 1.9s in a stock 98 running 8.4s... Added an ms4 cam, full exhaust, 4400 converter.. Ran 7.5s cutting high 1.5 short times..
This was with 323s but the principal still applies to 273s.

That post about street tires wasn't towards you babbage, its the guys with converters/etc.. If you're spinning its not worth posting results.

babbage1109 Dec 20, 2012 02:08 PM

Oh okay. Yeah I def never spun. Launching at 1700 with a stock stall.

1967BuickGS400 Dec 21, 2012 06:46 AM

I did the swap in my 71 skylark with a 455 big block. Went from 2.73 to 3.42. I got the same 60ft. and same et but 2 mph slower with the 3.42s. But like someone said before it feels faster.

roy Dec 22, 2012 11:05 AM

There is an Austrian overhere with a tubocharged LSX Camaro topending on high speed runs with 2.75 in a Ford nine inch ( 240+ mph). Speed can be made with these gears if you have the HP.

Roarin_8 Dec 26, 2012 10:20 AM


Originally Posted by roy (Post 16998139)
There is an Austrian overhere with a tubocharged LSX Camaro topending on high speed runs with 2.75 in a Ford nine inch ( 240+ mph). Speed can be made with these gears if you have the HP.

Most guys on here are looking for quickness. Doing a certain distance in a certain amount of time as quickly as possible. We don't have the autobahn over here ;)


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