New IS-F Exhaust by ISS Performance

[ISSForged]

OK I'm not a dyno tech but I will try to answer your question to the best of my ability. The Dyno is a DynoJet and it was set to STD not SAE. From what I see on the sheet it reads STD: 1.02 that I assume is the correction factor. If you need any other info I will need Paul to step in and he will be out till Tuesday. I can also call Finetune (where I got the car Dyno'd) and ask them anything you need but I think this answers your question. If not let me know. Janoy

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[jake14_85]

do you know when the exhaust will be avilable for purchase

[ISSForged]

We are already taking orders on the exhaust. They take 2 weeks from manufacturing and we are selling the first 5 Systems for $1500.

If you are interested PM me. We have 4 systems left.

Janoy

[jake14_85]

what size is the tubing from the headers back?

[SFdreamer]

Man, I think that sounds excellent. Well done, the look of it compliments the sound quite well also.

[ISSForged]

2.5" mandrel bent stainless piping with an X pipe right after the headers.

Originally Posted by jake14_85

what size is the tubing from the headers back?

Thanks SFdreamer

Originally Posted by SFdreamer

Man, I think that sounds excellent. Well done, the look of it compliments the sound quite well also.

[xchosun1x]

That looks pretty menacing...no bumper damage from heat?

[ISSForged]

Thanks.

We use an exhaust tip with a built in heat shield to protect the bumper from melting. Don't get me wrong it get hot, but no where near as hot as the rest of the piping.

We've been driving the car for 4 days now and there is no damage to the bumper.

Originally Posted by xchosun1x

That looks pretty menacing...no bumper damage from heat?

[houstonT]

No, not quite...all that tells me is that the actual RWHP that day was 358 rwhp (with 3 smoothing). The SAE CF was different, I bet lower, and the smoothing affects the peak numbers too. We typically use SAE and smoothing set to 5 to compare numbers and on a car like the ISF where an exhaust makes a small difference (relatively speaking) it helps for the curve to be as smooth as possible (smoothing to 5) and the cf to be SAE.
Peter

Originally Posted by ISSForged

OK I'm not a dyno tech but I will try to answer your question to the best of my ability. The Dyno is a Dyno Dynamic and it was set to STD not SAE. From what I see on the sheet it reads STD: 1.02 that I assume is the correction factor. If you need any other info I will need Paul to step in and he will be out till Tuesday. I can also call Finetune (where I got the car Dyno'd) and ask them anything you need but I think this answers your question. If not let me know.

Janoy

[ISSForged]

Originally Posted by houstonT

No, not quite...all that tells me is that the actual RWHP that day was 358 rwhp (with 3 smoothing).

So I guess it does answer your question. If your able to calculate the rwhp your question has been answered. NO? 358 rwhp is with-in the 25-30 rwhp we say it makes, I don't see where your trying to go with this. I'm guessing you would have to ask everyone that claims 25rwhp with their system the same question. We were curtious enough to post it, you just had to read the sheet to really find your answer. If you would like to get a system for yourself so you could test it let me know. We are very proud of the system and your skepticism show how good our results really are.

[houstonT]

Janoy, let me help you out bud, you don't seem to know much about dyno's and reporting your stats so I'll assist...

That car could have made 358 rwhp actual on one dyno at 10,000 ft elevation and made 370 rwhp actual on another dyno at sea level. Factor in barometric pressure and temperature and all of a sudden your actual rwhp numbers for the same car on different dyno's in different conditions changes. Using the SAE cf (the most widely accepted cf) all of sudden the RWHP on the 358 rwhp car would correct up and the 370 rwhp would correct down and in a PERFECT world the same car on different dyno's with no changes would make about the same SAE corrected rwhp. Hence the reason I am asking for SAE corrected rwhp with 5 smoothing.

Does that help you? Don't get so defensive, it's the internet bud, just trying to really understand the numbers as any potential customer that knows what they are talking about will...

Peter
p.s. there is NO skepticism, just a desire to understand the real gains and a desire to understand what my car would make with your exhaust on a dyno in another part of the US

Originally Posted by ISSForged

So I guess it does answer your question. If your able to calculate the rwhp your question has been answered. NO? 358 rwhp is with-in the 25-30 rwhp we say it makes, I don't see where your trying to go with this. I'm guessing you would have to ask everyone that claims 25rwhp with their system the same question. We were curtious enough to post it, you just had to read the sheet to really find your answer. If you would like to get a system for yourself so you could test it let me know. We are very proud of the system and your skepticism show how good our results really are.

[ISSForged]

Peter I'm not getting defensive. I think we already covered that I'm no dyno tech. If I was, I would probably be able to answer your question better. But I think that was already established when I said " I am no dyno tech" LOL...

We did the dyno run on STD not SAE. It is a smooting 3 as it reads on the dyno sheet. It is not my dyno and STD is the setting of the place where I dynoed the car. From what I understand the correction factor has no adjustments on a Dynojet. I know the Dyno dynamics and Mustang Dyno's can be adjusted but not a DYNOJET. I know there is a convertion chart and if you look around you can find the answer your looking for. Regardless there will be differences from my results to your. There are changes from run to run on a dyno. It never seems to produce the same number consistently. There is always a window. That's why we created a 5whp window.

A friend emailed this to me to try to help you out.

Identifying Your Correction Factor:

Dynojet:
If you look at a dynojet graph in the upper right corner, you will see where it says the correction method being used. The options are SAE, STD, Uncorrected and a few not needed for discussion. You will also notice a smooth factor (up to 5) which dyno operators use to make the power curves and any other data displayed, such as AFR, seem more accurate and smooth. You will also see AFR graphs scaled DOWN to hide flaws in the curve.

MD:
A Mustang Dyno ONLY uses SAE Corrections. Smoothing can also be controlled as well as scale for the Graphical Outputs.


Overview:
Most of the stated horsepower numbers are “Corrected” values. The correction standards were developed to discount the observed horsepower readings taken at different locations and weather conditions. It is obvious that an engine builder in Colorado could not produce as much horsepower as a shop at sea level. There is just less oxygen for the engine to burn at the higher altitude. What are less obvious are the other weather condition effects on the engine. So in order to compensate for this all advertised horsepower is “corrected” to several different industry standards.

Here is some quick math (using assumptions and round numbers):

STD:
Air Temperature: 60F
Absolute Pressure: 29.92 inches Hg
Relative Humidity: 0%

Relative Horsepower : 104.8%
Air Density: 1.223kg/m3
Relative Air Density: 99.8%
Density Altitude: 67feet
Virtual Temperature: 60F
Vapor Pressure: 0 inches Hg
Dyno Correction Factor: .955

SAE:
Air Temperature: 77F
Absolute Pressure: 29.23 inches Hg
Relative Humidity: 0%

Relative Horsepower : 100%
Air Density: 1.157kg/m3
Relative Air Density: 94.4%
Density Altitude: 1952feet
Virtual Temperature: 77F
Vapor Pressure: 0 inches Hg
Dyno Correction Factor: 1

Maybe we are not being defensive but stuck in crossroad of frustration trying to answer a question. It's really hard to determine attitude when there is no expressions but I am in no way aggravated at you and would really like to get your question answered.

Hope this helps.

[ISSForged]

OK I found the number. There is a 3% difference between a STD Smoothing 3 to a SAE Smoothing 5.

This test was done on the same dyno with the same vehicle running different types of correction factors.

SAE 5 4th Gear 85.29 WHP

STD 3 4th Gear 87.60 WHP

[INtreX]

Seems houstonT has it out for you. Exhaust looks pretty sweet. Keep em comin!!!!

[michaelrc51]

The exhaust looks nice and the gains are definitely worth the $.
Nice job


I think Peter is just trying to make sure everyone is straight on what kind of gains can be expected at different elevations, and other factors, so they can market their product better.