Optimal Shift points

JamGtStang · 02-14-2001, 09:58 AM

Shift points on a 90 gt almost stock..off road h-pipe, flows, advance timing, no gears,air filter

thanxs

Green92LX · 02-14-2001, 10:02 AM

Depends on where it stops pulling, depends on the car...probably ball park 5200ish, but every car is different...

------------------
1992 5.0 LX, Edelbrock 6037 Heads, Cobra Intake,E-303, 1.6 Roller Rockers,65MM Holley TB, 75 MM Pro M Mass Air, 190 LPH FP w/ 24 lb injectors,BBK equal length shorties,offroad h-pipe,Mac Flowpath Mufflers, Pro 5.0, 3.73's,Motorsport "C" springs,welded subframe connectors, Ponies w/ 225/50 Nittos, 93 Cobra Spoiler

Daily driver: 89 Coupe with 205K plus, BBK shorties,offroad h-pipe,2-chamber flowmasters with dumps, cut and welded stock shifter...and it runs like a champ.

302 LX Eric · 02-14-2001, 10:49 AM

A dyno is a really good way to help you figure out where to shift But, 5200 sounds good to me. Maybe even 5300.

E

------------------
1991 5.0 LX Coupe -37,800 miles

13.17 @ 106.14 mph w/ 2.138 60'

Pro-Charger D-1SC on the way!!!

Jaydee · 02-14-2001, 11:43 AM

When my LX was modded to the level your car is at, it actually slowed down if I shifted higher than 5,300 rpm - slowed down by more than a tenth when I shifted at 5,600

------------------
1965 K code coupe - numbers matching - restoration ongoing. 1987 LX notch, stock heads and intake, 3.55's and typical bolt on's 13.89@100.25

MiracleMax · 02-14-2001, 01:30 PM

If the car's powerband is basically the same as the stock power curve then try and find a dyno test of the stock 5 litre powerplant (better yet go visit a chasis dyno) then take the data sheet and visit
http://www.prestage.com/

they have a shift point calculator there.

Jeff Chambers · 02-15-2001, 07:27 AM

I've got a discussion on shift points on my website including some graphical demonstrations. It can really help you decipher what's going on. To really do it effectively though you need to do a Max says and visit the dyno. There is really no way to wisely choose it without knowing the HP/TQ trends of your car. In fact, one shift point really isn't enough. You need different shift points for each gear to really get the most out of your car. Most of us are limited to single shift lites, unless you've bought one of the more expensive tachometer/lite combinations.

------------------
Jeff Chambers
Trophy Stock #3
11.97 Seconds / 114.5 MPH
Chambers Racing Team

02-14-2001, 09:58 AM	#1
JamGtStang Registered Member Join Date: Dec 2000 Location: Miami, Fl Posts: 58	Optimal Shift points Shift points on a 90 gt almost stock..off road h-pipe, flows, advance timing, no gears,air filter thanxs

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02-14-2001, 10:02 AM	#2
Green92LX Registered Member Join Date: Jun 1999 Location: North Haven,CT Posts: 336	Depends on where it stops pulling, depends on the car...probably ball park 5200ish, but every car is different... ------------------ 1992 5.0 LX, Edelbrock 6037 Heads, Cobra Intake,E-303, 1.6 Roller Rockers,65MM Holley TB, 75 MM Pro M Mass Air, 190 LPH FP w/ 24 lb injectors,BBK equal length shorties,offroad h-pipe,Mac Flowpath Mufflers, Pro 5.0, 3.73's,Motorsport "C" springs,welded subframe connectors, Ponies w/ 225/50 Nittos, 93 Cobra Spoiler Daily driver: 89 Coupe with 205K plus, BBK shorties,offroad h-pipe,2-chamber flowmasters with dumps, cut and welded stock shifter...and it runs like a champ.

02-14-2001, 10:49 AM	#3
302 LX Eric or '331 LX Eric' Join Date: Jan 1999 Location: Columbus, Ohio Posts: 2,142	A dyno is a really good way to help you figure out where to shift But, 5200 sounds good to me. Maybe even 5300. E ------------------ 1991 5.0 LX Coupe -37,800 miles 13.17 @ 106.14 mph w/ 2.138 60' Pro-Charger D-1SC on the way!!!

02-14-2001, 11:43 AM	#4
Jaydee Registered Member Join Date: Sep 2000 Location: Conn. Posts: 220	When my LX was modded to the level your car is at, it actually slowed down if I shifted higher than 5,300 rpm - slowed down by more than a tenth when I shifted at 5,600 ------------------ 1965 K code coupe - numbers matching - restoration ongoing. 1987 LX notch, stock heads and intake, 3.55's and typical bolt on's 13.89@100.25

02-14-2001, 01:30 PM	#5
MiracleMax Registered Member Join Date: Apr 1999 Location: Hayes, Va, USA Posts: 798	If the car's powerband is basically the same as the stock power curve then try and find a dyno test of the stock 5 litre powerplant (better yet go visit a chasis dyno) then take the data sheet and visit http://www.prestage.com/ they have a shift point calculator there.

02-15-2001, 07:27 AM	#6
Jeff Chambers Moderator Join Date: Aug 2000 Location: Milan, OH Posts: 2,699	I've got a discussion on shift points on my website including some graphical demonstrations. It can really help you decipher what's going on. To really do it effectively though you need to do a Max says and visit the dyno. There is really no way to wisely choose it without knowing the HP/TQ trends of your car. In fact, one shift point really isn't enough. You need different shift points for each gear to really get the most out of your car. Most of us are limited to single shift lites, unless you've bought one of the more expensive tachometer/lite combinations. ------------------ Jeff Chambers Trophy Stock #3 11.97 Seconds / 114.5 MPH Chambers Racing Team