Shift Points??

GhOsT6_9 · 06-01-2004, 07:53 PM

Ok I'm just curious as to what I should be shifting at with my current combo. I'm running a custom upper intake, F cam, 351W heads, long tubes, 3.73 gears. I have a girdle for the rocker arms, but not the bottom end, I am also running on the stock 89 bottom end. Also have custom chip with no rev limit.

I've been shifting at 5700RPM, but wondering if I should be going higher?? And on that how much higher could I go and not have the stock bottom end start throwing parts out the block?? Engine has 'bout 60K miles on it.

tmoss · 06-01-2004, 09:58 PM

To do that right you need a dyno curve so you know your TQ and HP charatarsitics and do some calculations. Got one?

tireburner163 · 06-02-2004, 01:23 AM

Vary your shift points at the track to see how it performs, but 5600-5800 should be pretty close.

-Josh, aka the tireburner

GhOsT6_9 · 06-02-2004, 05:03 PM

I do have a dyno sheet, but they only took the car up to 5500.

Peak TQ was 280 @ 3000
Peak HP was 238 @ 5300

Those numbers were before I had the car tuned with a chip as well so they could be slightly different now.

tmoss · 06-02-2004, 05:52 PM

I put your dyno data in a spreadsheet I have to help see where to best shift. Attached is the resulting sheet. You have a very flat torque curve which is good. Generally I like to keep my car between peak torque and peak HP on the track. Using that as a guide, I would shift 1-2 @ 6,000 rpm, 2-3 @ 5,400 rpm and 3-4 @ 4,600-5,000 - experiment with the 3-4 shift to see what gives best ET.

GhOsT6_9 · 06-02-2004, 09:06 PM

Wow, thats awesome. Thanks a ton. I need to get me one of those programs.

06-01-2004, 07:53 PM	#1
GhOsT6_9 Registered Member Join Date: May 2000 Location: Ontario,Canada Posts: 233	Shift Points?? Ok I'm just curious as to what I should be shifting at with my current combo. I'm running a custom upper intake, F cam, 351W heads, long tubes, 3.73 gears. I have a girdle for the rocker arms, but not the bottom end, I am also running on the stock 89 bottom end. Also have custom chip with no rev limit. I've been shifting at 5700RPM, but wondering if I should be going higher?? And on that how much higher could I go and not have the stock bottom end start throwing parts out the block?? Engine has 'bout 60K miles on it. __________________ 1989 Mustang LX Notch 5.0L, T-5, 1969 351W heads, cut & welded stock plenum, F-303 cam, Mac 1 5/8 full length headers, Cat'd H-pipe, 3.73 gears, Underdrives, SSM lift bars, E-Fan, 3G Alt, Custom Chip, Autometer gauges, Weld Draglite wheels , M/T ET Street Radials Best 1/4: 13.33@101.53MPH

06-01-2004, 09:58 PM	#2
tmoss Registered Member Join Date: Mar 2003 Location: Saint Louis, MO Posts: 634	To do that right you need a dyno curve so you know your TQ and HP charatarsitics and do some calculations. Got one? __________________ Tom (Torque) Moss 88Gt 5spd Vert, FLowmaster Catbacks, stock cam advanced 4° @ 108.5° ICL, NMRA prepped GT40P heads 1.85/1.55 valves and 1.7 rockers, MAC P headers Jet-Hot coated, 97 Exlporer intake (ported lower), TB and injectors. 277RWHP/330RWTQ (SAE). http://www.fastlanecars.com/

06-02-2004, 01:23 AM	#3
tireburner163 It's a lot like a race car Join Date: Aug 2000 Location: Meridian, MS Posts: 4,130	Vary your shift points at the track to see how it performs, but 5600-5800 should be pretty close. -Josh, aka the tireburner __________________ 1987 Buick T-type 1998 HD Electra Elide

06-02-2004, 09:06 PM	#6
GhOsT6_9 Registered Member Join Date: May 2000 Location: Ontario,Canada Posts: 233	Wow, thats awesome. Thanks a ton. I need to get me one of those programs. __________________ 1989 Mustang LX Notch 5.0L, T-5, 1969 351W heads, cut & welded stock plenum, F-303 cam, Mac 1 5/8 full length headers, Cat'd H-pipe, 3.73 gears, Underdrives, SSM lift bars, E-Fan, 3G Alt, Custom Chip, Autometer gauges, Weld Draglite wheels , M/T ET Street Radials Best 1/4: 13.33@101.53MPH

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