I bought my FFR MKI about 3 months ago, used. The guy I bought it from told me most of the good stuff about the motor, and I've had no reason to doubt anything he told me. I wanted to take it to the dyno to know what it puts down now, so I have a reference point as I make mods to it. One thing I had noticed in the car is that it pulls great up to about 4K rpm in each gear, but then sort of leaves me wanting more power after 4k. So, here's what the motor has in it:
- 302 from a 1991 Mustang, EFI
- Motorsport b303 cam
- Heads: ported and polished, 2.02 valves (he said they came from a 1970 motor. Not sure what exactly)
- fully hydraulic and roller: rockers, etc.
- Cobra intake
- 72 mm intake tube
- 24 lb injectors
- forged pistons
- 9.8:1 compression
- underdrive pulleys
It also has the stock T5 tranny and 3.73 gears. I'm sure this isn't a complete enough picture of the motor to really tell what kind of power it should put out, but should give a good idea.
So, I go to the dyno, honestly not knowing what to expect. I've never owned a Cobra before, so knowing how quick it is makes me feel like it should be putting down 300 or so hp. Again, just a guess. Boy, was I wrong. Here's the dyno graph:
234 hp! That's all? The torque starts dropping off after about 4k, which is in line with how the car feels when driving it.
One thing that seems like a major constraint is the headers. I have the stock headers, feeding a j-pipe. The headers are small, and seem kinda crimped in a bunch of places. I don't have a great picture to show them, but here's one look at them:
Since the motor starts petering out at about 4k, maybe that's when the exhaust is really starting to be too much for the size/style of the headers, and starts limiting the power?
Does anyone have any thoughts on my motor and numbers? Do the numbers seem right for a fairly well built 302? Does my theory about the exhaust seem correct?
Any and all thoughts would be appreciated,
Darren
Dyno'd my motor: HP sucks!
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