SFI flywheel choice............ - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 4 Old 05-24-2017, 10:50 AM Thread Starter
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SFI flywheel choice............

Finally blew up my stock clutch at the track last week. Must say, I sure got my money's worth. Over 200 launches at 6000 and 60' times as low as 1.49, but mostly 1.5xx. As it was starting to go I could watch the sixty slowly climb to high 1.5's. According to FRPP tech, the clutch on my Mach 1 crate motor was similar to the old King Cobra. Upon removal, it was a Valeo, half the organic was ripped off and shredded on pp side. Only making about 375 at the flywheel, T56 with 2.66 first (on it's way out to D&D for a 26 spline input and 5th and 6th removed). When the clutch was good, consistent 11.80-11.84 ET's. The stock flywheel was a nodular iron stamped Cobra, 8 bolt in the Mach, and it weighed 23 lbs.

I have 90% decided to go with the Exedy stage 1 Mach 400, organic disc and the pp has a clamp to 2700ish. I was going to pair that with their chrome molly SFI lightened flywheel, which looks like a really nice piece, but it only weighs 16.1 lbs, vs the 23 I had. That 7 lbs lighter is making me a little nervous about the whole inertia stored energy concept, and hurting my 60' and subsequent ET. All the Ford Racing SFI steel flywheels are up around 29-30 lbs, and that causes me concern about being too heavy.

Thoughts?


99 coupe. C4/8Ē 5000 stall w/2003 Mach crate motor FRPP stock N/A, Kooks LT's and X,dumps no muffs. 4.56's
Best ET 11.42 Best MPH 116.33Best 60" 1.49
Coincidence. A convenient and overused word for the mentally lazy.
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post #2 of 4 Old 05-24-2017, 08:00 PM
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Here's thread from a few years back that might help.https://forums.corral.net/forums/drag...-vs-steel.html
I have since installed an aluminum 'wheel. I don't have any previous racing experience with steel vs. alum, and its hard to say what it's like on the street because I installed a more aggressive clutch at the same time.


'87, 105,000 mile stk short, SN89 Paxton 5 LBS, X303 Hds, E303, Cobra Int, 70 mm TB, 30# injrs, 1 5/8 full leng, no cats, 2 1/2 w/dumps, A5, 3.73, ET R's, Frnt Drag Eibach sprngs, Baseline Relocated upprs, HPM lwr arms, stk rear sprngs 1 coil cut, adj. struts shocks, 3150 w/dr. 1.60 11.39 118.
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post #3 of 4 Old 05-24-2017, 10:19 PM Thread Starter
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Thanks, good read. Makes me feel more comfortable about going with the Exedy 16.1 lb chrome molly wheel.

99 coupe. C4/8Ē 5000 stall w/2003 Mach crate motor FRPP stock N/A, Kooks LT's and X,dumps no muffs. 4.56's
Best ET 11.42 Best MPH 116.33Best 60" 1.49
Coincidence. A convenient and overused word for the mentally lazy.
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post #4 of 4 Old 05-26-2017, 08:51 PM Thread Starter
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Meh. Decided dropping 7-8 lbs off the stocker which was 23-24 was too much. Ordered the FRPP 20 lb 8 bolt billit steel, so 3-4 lbs lighter. Teamed it with the Exedy Mach 400, according to Exedy tech rep fashioned directly after the old King Cobra clutch. 2700 clamp, organic, 26 spline, and SFI 1.1. Should have all the parts to install in week or so, then need to attempt a mild break in before hard launches at track. Will post follow up on performance vs stocker. Want to try and help any stick racer out there with clutch and flywheel decisions. Tricky. Very tricky. Black art for the Coyote stock guys who have to run a diaphram style clutch. So my decisions are 2+2 = 4 vs E=MC squared compared to them. Right Ed?

99 coupe. C4/8Ē 5000 stall w/2003 Mach crate motor FRPP stock N/A, Kooks LT's and X,dumps no muffs. 4.56's
Best ET 11.42 Best MPH 116.33Best 60" 1.49
Coincidence. A convenient and overused word for the mentally lazy.
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