stock head- rpm- power.

ols0051 · 08-07-2004, 11:26 PM

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?

tmoss · 08-08-2004, 11:36 AM

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.

Capri306 · 08-08-2004, 02:11 PM

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?

ols0051 · 08-08-2004, 08:18 PM

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.

ols0051 · 08-11-2004, 12:32 PM

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.

88workcar · 08-11-2004, 09:47 PM

Do you have a good tach?

ols0051 · 08-12-2004, 01:39 PM

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.

08-07-2004, 11:26 PM	#1
ols0051 Registered Member Join Date: Sep 2002 Location: cent.wis Posts: 203	stock head- rpm- power. 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?

08-08-2004, 11:36 AM	#2
tmoss Registered Member Join Date: Mar 2003 Location: Saint Louis, MO Posts: 634	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. __________________ 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/

08-08-2004, 02:11 PM	#3
Capri306 Moderator Join Date: Sep 1998 Location: Grand Rapids, Michigan, USA Posts: 1,001	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? __________________ Capri306, Moderator The Mustang Works Online 1979 Mercury Capri 1987 5.0L Mustang LX Notchback 1993 5.8L Eddie Bauer Bronco

08-11-2004, 09:47 PM	#6
88workcar Registered Member Join Date: Oct 1999 Location: Pierre Part, La. U.S.A. Posts: 1,850	Do you have a good tach? __________________ 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 I'm somewhere in tthe middle.

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08-08-2004, 08:18 PM	#4
ols0051 Registered Member Join Date: Sep 2002 Location: cent.wis Posts: 203	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.

08-11-2004, 12:32 PM	#5
ols0051 Registered Member Join Date: Sep 2002 Location: cent.wis Posts: 203	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.

08-12-2004, 01:39 PM	#7
ols0051 Registered Member Join Date: Sep 2002 Location: cent.wis Posts: 203	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.