Back on the dyno!!

Boost or Bust

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So I had a bearing spin on the idler pulley that’s on the supercharger bracket, that equaled catastrophic supercharger mount failure. I ordered the new bracket etc to replace everything and waited the month for the parts….. and that’s how it started. So I ordered a smaller pulley and threw it back in the dyno. I jammed a 3.12 pulley on the vortech S trim on a stock 97 cobra with a treadestone intercooler, 47lbs injectors, 255lbs fuel pump, bassani x with cats and dynomax turbo mufflers. The result !! The tuner looked scared on the first pull, 474hp and 431tq at 5800rpm. The car makes 9psi, we pulled the limter down to 6k, took some timing out and cleaned up the fuelling. End result is 463hp and 413tq if I remember correctly. They will email me the chart in a couple days and I’ll post it. The car works very well and pulls like a freight train to 6K. I guess I will be buying forged internals after all this year. I was trying to avoid it. Either way 463hp seems like big number for 9psi does it not?
 

shurur

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Iirc 8-9# and C heads make 450-475 rwhp...?

Was this done on a mustang dyno? ...or a dyno jet.?

390-400+...
 
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robvas

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Did it show 9psi on the boost gauge or is that an estimate of some sort
 

Boost or Bust

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I think so but I’m not sure. I’ll put the graph up this week when it’s emailed to me. He was very concerned about putting a hole in the block.
 

CobraBob

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I was just curios because if the numbers were uncorrected then that would partially explain the higher than normal numbers for those mods/fuel. Either way, you've got a nice setup.
 

04DeadShort

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Im shocked by the torque. I'm practically running the same setup on my 98 Cobra and only made a little over 350ft lbs. The difference may be the intercooler though. Your running a Treadstone while I have a CXRacing.
 

shurur

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I am thinking your are getting estimated flywheel hp for your displayed dyno numbers.

If correction is 1.1, then average (FW estimate) dyno/1.1 = 466/1.1 = 423 rwhp.

This is more credible.
 

CobraBob

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I am thinking your are getting estimated flywheel hp for your displayed dyno numbers.

If correction is 1.1, then average (FW estimate) dyno/1.1 = 466/1.1 = 423 rwhp.

This is more credible.
You may be right, but I've never heard of a dyno shop giving a customer flywheel numbers.
 

shurur

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You may be right, but I've never heard of a dyno shop giving a customer flywheel numbers.
Just grasping at straws really!
But it sounds like his mechanic is new to this in that the was scared of blowing the engine and such.
Op hasn't got the actual dyno sent to him yet, so everything is speculation right now.
 
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