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#1 |
Registered Member
Join Date: Sep 2002
Location: cent.wis
Posts: 203
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![]() At what rpm should I give up on the stock heads and cam? I have a 5200rpm in the msd and the shift light is set at 5k. Am I giving up too early?
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#2 |
Registered Member
Join Date: Mar 2003
Location: Saint Louis, MO
Posts: 634
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![]() I think your very close to having it right. The best way to tell shift points is to have a dyno (to get curve info from) and then your trans type (for gear ratios) to figure best shift points for each gear.
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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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#3 |
Moderator
Join Date: Sep 1998
Location: Grand Rapids, Michigan, USA
Posts: 1,001
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![]() Most guys with stock heads shift 5800-6000, and advancing the timing would help a bit on the top end. Might kill some low end torque, so launch hard. I usually use the "highway feel" in 3rd (AOD) to see when it starts to feel like it's starving for air, and make ~250rpm lower a shift point. A chassis dynamometer would be best, but I'm a cheap bastage at this point.
![]() Is everything else stock?
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Capri306, Moderator The Mustang Works Online 1979 Mercury Capri 1987 5.0L Mustang LX Notchback 1993 5.8L Eddie Bauer Bronco ![]() |
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#4 |
Registered Member
Join Date: Sep 2002
Location: cent.wis
Posts: 203
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![]() I'll be going to the track on tuesday, so I'll try some different shift points. But every pass is different depending on launch and tire spin. I hope to be able to get into the 13's, all I need is .2ths. If I power shift the thing off the msd that might get a little more than just shifting after a 2k launch. which is what I was doing.plus since the last outing I have also added pulleys,moved the battery to the trunk and added a elec. fan which is not finished yet so I'll take it all off. Other mods are 1-5/8 shortys,mac o/r x-pipe, Mac cat back,msd 6al,msd coil and 8.5 wires,trickflow street intake,70mm tb,sudframe conn,no/ac,no smog,3.73's,t5,welds,26x10.5m/t. 5inch tach etc.
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#5 |
Registered Member
Join Date: Sep 2002
Location: cent.wis
Posts: 203
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![]() I think 5200rpm is about it on the stock heads. But I did manage a 13.90@98 Because of the pulleys and taking off the clutch fan. Only a dyno would prove it, but it didn't seem to help running it any higher.
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#6 |
Registered Member
Join Date: Oct 1999
Location: Pierre Part, La. U.S.A.
Posts: 1,850
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![]() Do you have a good tach?
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88workcar 1988 Mustang LX 342. 417rwhp @ 6800. 28 X 10 ET Drag, 4.30s, 10.69 @ 126.43 1.42 60ft. 11.13 @ 127.7 on BFGs 1.72 60ft Rice Hater # 42 To be old and wise, You must first be young and stupid ![]() |
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#7 |
Registered Member
Join Date: Sep 2002
Location: cent.wis
Posts: 203
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![]() Yes, I just put in a new autometer 5 tach w/shift light. Connected it to my msd. Now I see how messed up the stock tach really is. I could probably get a better ET with more practice.
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