Need Gear Recommendation

Lonnie Cox · 01-06-2013, 01:07 PM

You have all helped me with my stocker, I am getting closer to the index.But need more help.what I have is.
76 Camaro
350 cid
287 NHRA rated HP
350 turbo with 275 First
5.13 gears
Mickey Thompson ET Slicks 9x30
we ran a 12.80 @ 102 yesterday
shifting @ 7k
went thru the lights @ 6500
60ft 1.71
I have the Cal Tracs bars and springs
Thank You all I am happy I finally got in the 12's

Alan Roehrich · 01-06-2013, 01:30 PM

I'd consider going to a 2.52:1 low gear, and a 5.38:1 rear gear.

Lonnie Cox · 01-06-2013, 02:15 PM

Alan I dont want to spend any money on this trans, would the 5.38 work for now I am thinking of a Pro trans later I am not sure I dont know what first gear ..

Mark Lewis · 01-06-2013, 04:26 PM

what type of converter?
Looks like you ned about .15 just in 60'
5.38 won't help that much

Greg Reimer 7376 · 01-06-2013, 04:39 PM

Sounds like you're close, but try short shifting it about 6500 and seeing what happens. I usually don't turn a 327 that high through the gears. 5.38's to 5.13's isn't that different-5-7 % or so. You do need 60 foots in the 1.55-1.58 range, though. What class are you shooting for, and what index?

Alan Roehrich · 01-06-2013, 04:47 PM

Yeah, the 1-2 shift probably needs to be about 6200-6400, at most.

The 5.38 will help if you swap to a 2.52 low gear, what's going on here is you have way too much drop between 1st and 2nd, the car is not moving fast enough, and the RPM drops too far.

jmcarter · 01-06-2013, 04:58 PM

Think Mark is on it...converter or something else needs to be addressed. That 60 ft has to get better regardless of which index you're after.

Myron Piatek · 01-06-2013, 05:02 PM

Carb tuning is a big factor as well!

Lonnie Cox · 01-06-2013, 05:35 PM

Quote:

Originally Posted by Greg Reimer 7376

Sounds like you're close, but try short shifting it about 6500 and seeing what happens. I usually don't turn a 327 that high through the gears. 5.38's to 5.13's isn't that different-5-7 % or so. You do need 60 foots in the 1.55-1.58 range, though. What class are you shooting for, and what index?

Greg its is a 350 cid the class is I/SA 12.30 index,

Lonnie Cox · 01-06-2013, 05:40 PM

Quote:

Originally Posted by Lonnie Cox

Greg its is a 350 cid the class is I/SA 12.30 index,

converter is ATI 8inch Treemaster Salesman Charlie Plott
The 2 step was not hooked up, seems to do better when I flashed @ about 2800

01-06-2013, 01:07 PM	#1
Lonnie Cox Junior Member Join Date: May 2010 Posts: 88 Likes: 0 Liked 0 Times in 0 Posts	Need Gear Recommendation You have all helped me with my stocker, I am getting closer to the index.But need more help.what I have is. 76 Camaro 350 cid 287 NHRA rated HP 350 turbo with 275 First 5.13 gears Mickey Thompson ET Slicks 9x30 we ran a 12.80 @ 102 yesterday shifting @ 7k went thru the lights @ 6500 60ft 1.71 I have the Cal Tracs bars and springs Thank You all I am happy I finally got in the 12's

01-06-2013, 01:30 PM	#2
Alan Roehrich VIP Member Join Date: May 2006 Location: Murfreesboro TN Posts: 4,907 Likes: 993 Liked 1,032 Times in 270 Posts	Re: Need Gear Recommendation I'd consider going to a 2.52:1 low gear, and a 5.38:1 rear gear. __________________ Alan Roehrich 212A G/S

01-06-2013, 02:15 PM	#3
Lonnie Cox Junior Member Join Date: May 2010 Posts: 88 Likes: 0 Liked 0 Times in 0 Posts	Re: Need Gear Recommendation Alan I dont want to spend any money on this trans, would the 5.38 work for now I am thinking of a Pro trans later I am not sure I dont know what first gear ..

01-06-2013, 04:26 PM	#4
Mark Lewis Member Join Date: Apr 2006 Posts: 330 Likes: 55 Liked 184 Times in 37 Posts	Re: Need Gear Recommendation what type of converter? Looks like you ned about .15 just in 60' 5.38 won't help that much

01-06-2013, 04:39 PM	#5
Greg Reimer 7376 VIP Member Join Date: Nov 2008 Location: Glendora,Calif. Posts: 1,110 Likes: 164 Liked 646 Times in 207 Posts	Re: Need Gear Recommendation Sounds like you're close, but try short shifting it about 6500 and seeing what happens. I usually don't turn a 327 that high through the gears. 5.38's to 5.13's isn't that different-5-7 % or so. You do need 60 foots in the 1.55-1.58 range, though. What class are you shooting for, and what index?

01-06-2013, 04:47 PM	#6
Alan Roehrich VIP Member Join Date: May 2006 Location: Murfreesboro TN Posts: 4,907 Likes: 993 Liked 1,032 Times in 270 Posts	Re: Need Gear Recommendation Yeah, the 1-2 shift probably needs to be about 6200-6400, at most. The 5.38 will help if you swap to a 2.52 low gear, what's going on here is you have way too much drop between 1st and 2nd, the car is not moving fast enough, and the RPM drops too far. __________________ Alan Roehrich 212A G/S

01-06-2013, 04:58 PM	#7
jmcarter VIP Member Join Date: Dec 2008 Location: Richmond Hill GA (and Port Ludlow WA) Posts: 4,118 Likes: 1,970 Liked 2,678 Times in 850 Posts	Re: Need Gear Recommendation Think Mark is on it...converter or something else needs to be addressed. That 60 ft has to get better regardless of which index you're after. __________________ Jim Carter 2340 Super Stock 2340 SST/2340 Stock

01-06-2013, 05:02 PM	#8
Myron Piatek VIP Member Join Date: Nov 2001 Location: Florida Posts: 1,538 Likes: 34 Liked 132 Times in 48 Posts	Re: Need Gear Recommendation Carb tuning is a big factor as well!