Dyno Numbers

diablopony · 06-06-2003, 10:55 PM

I finally took my car to the dyno to get the real picture. I wasn't too disappointed. They tuned the carb with the following results:

o 277.8 rwhp @ 5467 RPM
o 296.7 ft/lbs @ 4534 RPM

The motor runs great, but I'm not thrilled with the manifold vacuum. My old 289 had 22" of vacuum at idle. The 5.0 has 17" of vacuum. This is not great for my power assist brakes and C-4 trans. Any way I can increase the vacuum without switching cams? Retarding the timing seems to help vacuum, but impacts performance. I have an MSD distributor without the box. Would ignition be something that can help me?

hobgoblin351 · 06-08-2003, 07:30 AM

Try adding a vacum can. Summit makes a nice billet one. With a chrome guage, it looks cool under the hood.

diablopony · 06-08-2003, 11:44 AM

Hobgoblin, this is a great idea. I took a look at these and sounds like it will fix my problem. Thanks for the advice.

06-06-2003, 10:55 PM	#1
diablopony Registered Member Join Date: Jan 2001 Location: Clayton, CA USA Posts: 116	Dyno Numbers I finally took my car to the dyno to get the real picture. I wasn't too disappointed. They tuned the carb with the following results: o 277.8 rwhp @ 5467 RPM o 296.7 ft/lbs @ 4534 RPM The motor runs great, but I'm not thrilled with the manifold vacuum. My old 289 had 22" of vacuum at idle. The 5.0 has 17" of vacuum. This is not great for my power assist brakes and C-4 trans. Any way I can increase the vacuum without switching cams? Retarding the timing seems to help vacuum, but impacts performance. I have an MSD distributor without the box. Would ignition be something that can help me? __________________ '68 convert, 5.0 GT-40 Crate motor, C-4, Tri-Y headers, 3.25 rear gears

06-08-2003, 07:30 AM	#2
hobgoblin351 Registered Member Join Date: Sep 2002 Location: NYC Posts: 245	Try adding a vacum can. Summit makes a nice billet one. With a chrome guage, it looks cool under the hood. __________________ 1970 Stang Conv: en:Boss351 (balanced/blueprinted) mech cam(240*@.050/.540 lift) Scrw in studs/comp cams rllr rkr Mldn valves 2.19in 1.71ex ported polished cc'd hrdnd ex Keith Black FT pistons(10.25/1) Weiand Excellorator manifold Holley700 DP mech 2nds MSD 6 box and Dis Headers/2 1/2 inch duels tr: modified FMX re:9-inch/3.89 limited slip

06-08-2003, 11:44 AM	#3
diablopony Registered Member Join Date: Jan 2001 Location: Clayton, CA USA Posts: 116	Hobgoblin, this is a great idea. I took a look at these and sounds like it will fix my problem. Thanks for the advice. __________________ '68 convert, 5.0 GT-40 Crate motor, C-4, Tri-Y headers, 3.25 rear gears

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