Interesting testing - cosworth cams - 100 octane fuel and test pipe tested Evo IX

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Apr 3, 2007 | 11:22 AM

#16

cij911

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From: Socal :)

Damn Al !! I have to give you some MAJOR PROPS for the power coming on so strong and early...Nice job!

Apr 3, 2007 | 11:28 AM

#17

SRT-TO-EVO

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From: Westchester, NY

Quote:

Originally Posted by DynoFlash

I would not say causing knock

It is more like an exhuast restriction creates additional un-needed back pressure which results in ineffective exhuast gas evacuation fron the cylinders

This condition enahances the tendancy to knock

IX Evos are very senestive to knock

I thought it was the opposite? IX's are NOT as prone to knock than the VIII's due to the extra cooling passages in the head.

Apr 3, 2007 | 11:43 AM

#18

DynoFlash

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From: 2003 Evo VIII - Silver

Quote:

Originally Posted by SRT-TO-EVO

I thought it was the opposite? IX's are NOT as prone to knock than the VIII's due to the extra cooling passages in the head.

This is true - the engine itself and larger turbo make the car less prone to actual knock

The ecu however is more sensitive and will pull timing faster - particularly at high rpms

When you add the cams - the car picks up a lot of low end power but it is hard to make large gains up top (on pump gas) without seeing knock counts

I will post the final dyno numbers later this evening - the sheet actually came out really good

Last edited by DynoFlash; Apr 3, 2007 at 12:13 PM.

Apr 3, 2007 | 11:45 AM

#19

SRT-TO-EVO

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From: Westchester, NY

Quote:

Originally Posted by DynoFlash

This is true - the engine itself and larger turbo make the car less prone to actual knock

The ecu however is more sensitive and will pull timing faster - particularly at high rpms

When you add the cams - the car picks up a lot of low end power but it is hard to make large gains up top without seeing knock counts

I will post the final dyno numbers later this evening - the sheet actually came out really good

Ohh, I see.

Apr 3, 2007 | 01:36 PM

#20

spyderx

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From: Baltimore/ DC

Comparing the dyno to my IX tune w/o cams+cat, looks like the cams+TP added about about 30lbs torque and 500rpm and +10WHP. Thanks for sharing. It's helpful to know for my cams decision.

Apr 3, 2007 | 03:25 PM

#21

DynoFlash

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From: 2003 Evo VIII - Silver

Quote:

Originally Posted by spyderx

Comparing the dyno to my IX tune w/o cams+cat, looks like the cams+TP added about about 30lbs torque and 500rpm and +10WHP. Thanks for sharing. It's helpful to know for my cams decision.

This is fairly uniform

With alchy or race gas the gains would be slightly higher

Apr 3, 2007 | 09:52 PM

#22

DynoFlash

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From: 2003 Evo VIII - Silver

Final results

You can see that the car is making huge TQ and decent power - at a low boost level - the cams help you make great power without jacking up the boost as much

conversly with the cams IF you jack up the boost it can get more knock happy

I think the taper is better on the finished product