Ishii Motor Industries checks Top Speed (Video)

[Ishii Motors]

Quick Video of our top speed test (and HP check) on our Demo FR-S

Need a little wind resistance to really know, however here is the stock potential.

Ishii


[ame="http://www.youtube.com/watch?v=zhshjDMfcto"]FR-S First Dyno and Top Speed - YouTube[/ame]

[Subaruwrxfan]

Holy crap! So the car has the gearing to do 170! Awesome, thanks for doing this test!

[TPO]

Great test and video

[Guff]

Wow, I thought it would only be geared to 155-160ish! 170 is pretty high!

[Boosted2.0]

Hook up some ground straps from the car to the dyno and turn off your bluetooth next time and you should be able to get rid of those dips.

[Hanakuso]

So in the real world are we looking at something around 130-150ish? Lets say bonneville flats

[Gardus@Supersprint]

230 kph (143 mph) with 200 hp if the aerodynamics are good and the gearing is right is possible.
What are the revs in 5th/6th at 130-140 mph?

The tall 6th gear is good news for future FI kits, with 250-300 hp you'll be able to go well over 250.

[arghx7]

What dyno are you using? If you had a dyno capable of road load simulation you could get pretty close to finding the real max speed without taking the vehicle to a runway or something.

Road load dynos apply load to simulate wind resistance, rolling resistance, etc. The load increases according to a quadratic function- a +bx +cx^2 , where x is basically the weight of the vehicle. You would want to use the load coefficients (a, b, and c) from Subaru or Toyota's EPA fuel economy certification applications. Those applications should be released on their website over the next few months.

[Keith@AIRAID]

Originally Posted by arghx7

What dyno are you using? If you had a dyno capable of road load simulation you could get pretty close to finding the real max speed without taking the vehicle to a runway or something.

Road load dynos apply load to simulate wind resistance, rolling resistance, etc. The load increases according to a quadratic function- a +bx +cx^2 , where x is basically the weight of the vehicle. You would want to use the load coefficients (a, b, and c) from Subaru or Toyota's EPA fuel economy certification applications. Those applications should be released on their website over the next few months.

That would be an inertia dyno like our Mustang. It's still up to the operator to simulate correctly. You enter the weight and coefficient of drag from a chart and it calculates the load it wants to put on the wheels. This is why inertia dynos always read lower than Dynojets etc.

[Keith@AIRAID]

Originally Posted by arghx7

What dyno are you using? If you had a dyno capable of road load simulation you could get pretty close to finding the real max speed without taking the vehicle to a runway or something.

Road load dynos apply load to simulate wind resistance, rolling resistance, etc. The load increases according to a quadratic function- a +bx +cx^2 , where x is basically the weight of the vehicle. You would want to use the load coefficients (a, b, and c) from Subaru or Toyota's EPA fuel economy certification applications. Those applications should be released on their website over the next few months.

That would be an inertia dyno like our Mustang. It's still up to the operator to set it up correctly. You enter the weight and coefficient of drag from a chart and it calculates the load it wants to put on the wheels. This is why inertia dynos always read lower than Dynojets etc.

[RWD-boxer]

Very cool no more tc with only 128 mph

[arghx7]

Originally Posted by Keith@AIRAID

That would be an inertia dyno like our Mustang. It's still up to the operator to set it up correctly. You enter the weight and coefficient of drag from a chart and it calculates the load it wants to put on the wheels. This is why inertia dynos always read lower than Dynojets etc.

Those charts are just basic guidelines. There's a number of special procedures for an individual vehicle to determine the coefficients. You can just use the emissions certification coefficients and it will be close enough for finding top speed. Certification coefficients are basically worst-case, so they're not likely to greatly overestimate the road load force on the vehicle. The certification documents for 2013 model year haven't been released yet, but here's a filing for a 2011 Subaru Legacy GT.

http://iaspub.epa.gov/otaqpub/displa...d=23135&flag=1 . and if you scroll down to page 15 of the PDF you will see:



I think on the Mustang Dyno Powerdyne software you need to put the road load into grade mode and then you can enter the test weight and coefficients. You'd have to wait until the certification applications are published though. For anyone who might be curious, you can search for them here http://iaspub.epa.gov/otaqpub/ .

[86knecht]

Going to need about 60 more hp to hit 170 but still cool lol

[Boosted2.0]

Originally Posted by Hanakuso

So in the real world are we looking at something around 130-150ish? Lets say bonneville flats

It definitely does around 130 - I don't know about higher. It will do 125 through a very gently banked sweeper with just OK pavement with no drama as well.