Dyno Numbers Finally

I see the mods in your sig, are you using the stock exhaust and intake/MAF/TB? I'm glad to see such numbers from a cobra IM.

Touring23 said:

I see the mods in your sig, are you using the stock exhaust and intake/MAF/TB? I'm glad to see such numbers from a cobra IM.

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We need more info about your combo, those numbers could be right on or too low.

What was your timing at? How about your air fuel ratio? I would think you could get another 20rwhp with that Cobra intake, it isn't that much better then a Performer

I agree that there is more power in an intake swap I don't think that your intake is at the limit of the power that it can make. Cobra intakes can make 280 RWHP without really sweating. 300 RWHP is possible but at that range it's getting a bit harder. 320+ is possible but the intake would be a big restriction at that point.

Your giving up significant power if your lower is a stock Cobra lower. I can fix that for you - PM me if you want details.

i think your numbers are pretty low

where you live at Krahkin?

krahkin said:

tmc - i agree that a cobra intake could make lots of power, i just need to get the lower port matched to my heads?

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I think that would be a good economical start but don't simply port match the lower. Have the entire lower ported and port matched.

ok ok ok this HAS to be a mustang dyno and not a dynojet

Here's my numbers.

262 rwhp
293 ftlbs rw.

Mods

f-303 cam, header shorties, o/r x-pipe, borla catback, 3:73 gears, aluminum drive shaft, under drive pullies, and k&n filter.

Stock cobra bottom end, heads(steel gt40s), intake, and throttle body.

With those heads you should be in the 300hp at the rear wheel range.

Like Snoozer said, are you sure this wasnt on a mustang dyno?

Check out my sig for details and dyno #'s. I had tmoss port the cobra lower. IMHO you should be putting out more power.

krahkin said:

Just to clarify a couple things. The cobra intake is untouched upper/lower. The AFRs are the 61cc stud heads (not the 58cc - planning on blower next year). Do my numbers still seem low, or do they seem about right?

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Said it before.............never mind.

There could be lots of reasons why the numbers did not climb as high as you expected.

You did not give details about the tune such as af ratio, spark and the like.

Most na h/c/i combos can gain at least 10 rwhp by someone who knows how to manipulate the spark/fuel tables.

I've seen combos that had after market maf's be pig rich or dangerously lean.

Did the motor have time to cool between the pulls?

More than once I've seen intake ports covered 1/8 of an inch by the gaskets.

How many miles on the short block?

Later
Grady