Shifting @ 5000 but motor wants more.... - Team Camaro Tech
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post #1 of 3 (permalink) Old Apr 27th, 03, 04:24 PM Thread Starter
Senior Tech
Join Date: Sep 2002
Posts: 166

Hey Guy's,
I have a 355 mild built, MSD ignition, stock heads, 435, 454 cam, 9.5:1 flat top pistons, 650 Holley DP. mech. 2'ns, it's connected to an automatic TH 350 with a stock stall.
My problem is when I'm in drive and I nail the gas the car shifts at about 5000 rpm. It feels like the motor can pull more. So I manualy shifted it at around 6000 and the motor felt great, no valves floating, I think I even could of pushed it a tad more.
What is causing the motor to shift at 5000 and what could I do to make it shift at a higher RPM.
I'm thinking about Dynoing my car to see what the peak HP is so I don't go blowing the heads off the motor.

[ 04-27-2003, 08:17 PM: Message edited by: SSupermanZ ]
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post #2 of 3 (permalink) Old Apr 27th, 03, 06:20 PM
Senior Tech
Join Date: Mar 2002
Location: Austin, TX, USA
Posts: 5,277

Two things determine shift - modulator pressure and govenor pressure. Altering either one will change the shift points. The most likely adjustment is to change the govenor. This usually consists of changing springs or grinding some off the weights. Problem is, the govenor will alter street shifts also. I don't know if this is undesirable or not, but beware.

The modulator adjustments will require valve body modifications of some sort. By tweaking the modulator, it's possible to get it to shift at 2500 or so when light-footing it, but give you the 6000 shift your looking for a WOT.


68 Coupe, 350 w/ Edelbrock Performer RPM heads, cam, intake, 700R4, Dave's small body HEI
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post #3 of 3 (permalink) Old Apr 28th, 03, 04:39 PM
Join Date: Apr 2003
Location: lynnwood wa.
Posts: 3

Dont know if you've checked out an adjustable modulator..their available at any parts house. Just a suggestion
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