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06-01-2004, 07:53 PM
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#1 |
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Registered Member
Join Date: May 2000
Location: Ontario,Canada
Posts: 233
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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.
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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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06-01-2004, 09:58 PM
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#2 |
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Registered Member
Join Date: Mar 2003
Location: Saint Louis, MO
Posts: 634
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To do that right you need a dyno curve so you know your TQ and HP charatarsitics and do some calculations. Got one?
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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/ |
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06-02-2004, 01:23 AM
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#3 |
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It's a lot like a race car
Join Date: Aug 2000
Location: Meridian, MS
Posts: 4,130
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Vary your shift points at the track to see how it performs, but 5600-5800 should be pretty close.
-Josh, aka the tireburner
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1987 Buick T-type 1998 HD Electra Elide |
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06-02-2004, 05:03 PM
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#4 |
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Registered Member
Join Date: May 2000
Location: Ontario,Canada
Posts: 233
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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.
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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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06-02-2004, 05:52 PM
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#5 |
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Registered Member
Join Date: Mar 2003
Location: Saint Louis, MO
Posts: 634
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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.
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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/ |
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06-02-2004, 09:06 PM
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#6 |
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Registered Member
Join Date: May 2000
Location: Ontario,Canada
Posts: 233
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Wow, thats awesome. Thanks a ton. I need to get me one of those programs.
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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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