Joker4096

iTrader: (2)

I doubt it's 530 to the wheels but you never know. I'm sure extremely high compression pistons, upgraded stroke, race fuel, custom cams are being used.

MileHIFcar

Basically the same output as Fords Voodoo 5.2 L in the GT350........

ilv1004s

iTrader: (8)

530hp at the crank
its very similar to the RCF 2UR with revised bits and pieces

ForzaF

iTrader: (3)

Woow 8500rpm wonder if it's got a custom made flat plane crank? Or they did hell of a job balancing the stock one

Defratos

Sub'd for updates

lobuxracer

iTrader: (2)

8500 rpm is going to mean a short service life. Mean piston speed is over 25 m/sec at that rpm. That's beyond ITR territory. To make this actually work means cams, revised VVTi parameters, port/valve work, piston lightening, stronger rods (would be nice to make them longer, but that's impossible), and rebuilds at about 50k miles or less depending on how much time is spent near red line.

The factory heads don't support breathing at higher rpm and it is obvious from the stock dyno chart the engine can't breathe at the factory redline. The bottleneck is the cams and ports. Fixing the cam timing helps, but I'd also bet they put in bigger diameter valves, and likely titanium on both intake and exhaust to preclude valve float at 8500 rpm. They also used stiffer valve springs (read shorter service life) and may have done something exotic with the valve lash caps to prevent them from becoming tiddly winks at high rpm.

This is just of the top of my head. Might be a whole lot more...

I8ABMR

It's a race car so rebuilds are not unexpected . Super excited to watch the VLN races this season and to post about it on my Facebook page. (Almost 10,000 F fans from all over the world )

GSteg

iTrader: (15)

I'm not too familiar with the IS-F's engine, but is the stock oil pump good for another 25% increase in RPM?

FilwithanF

iTrader: (1)

I agree. It's basically similar to the Dinan S3R E9x M3 stroker kit, which costs similar money. In Dinan's case, the 530hp was at the crank and in typical Japanese fashion, I believe this ISF's 530hp is also measured at the crank (Spoon, Jun, Seeker, and other tuners always seem to market crank numbers). Regardless of price though, I'm sure the engineering is spot on and this is going to be one sweet package most of us can lust after lol.

willstroo

I remember i watched this documentary on YouTube where "Mines" built a Nissan R 33/34 GTR engine, with seemingly underwhelming numbers of torque and HP compared to what some cars were making even on the street.. And it was expensive! Then they raced it around the track, with a non-biased couple of race drivers, and they both could not believe how fast the car was! The engine was just spot on, revved harder and faster than many other big HP builds.

They didnt go for number bragging rights, they went for a car that actually performed in all conditions, with engine parts that all harmonised and resulted in crazy ACTUAL usable power that resulted in a much faster car . Will trawl the tube and see if i find the link.

What im eluding to, is that i bet this car whilst not having jaw dropping numbers would be scary fast, brutally responsive, and faster than any of us have experienced with our FBO ISF's.

empathy

which makes it crazy to think that porsche is pushing near 500 hp from their 4 liter engine in the new gt3.

isfvss

The flat plane Mustang will be in the same boat as reliability goes, they have done extensive testing so I see no problem yet, but the Stang sounds, O SO MENTAL, I could almost be persuaded to buy one

lobuxracer

iTrader: (2)

There is a whole lot to say about area under the curve vs. peak numbers. Turbo cars are a lot like this - big peak numbers, but very hard to keep in the meat of the power, especially when the turbos get big and laggy. It doesn't mean it isn't fast, it's just a lot harder to make it perform.

When I port cylinder heads, I am looking for a number of things, but primarily I am looking for the ability to fill the cylinder in the middle rpm range. You can tweak your power curve with cam timing, but you can't tweak ports that are too big or too small and you can't tweak valves that aren't shaped well (like factory valves). I am always looking for useful power, fewer necessary shifts, and giving the driver a wider range of options when it comes to getting power out of the engine. I learned a lot about this first hand racing motorcycles. It's very possible to have more power than you would like for a given track, and it's very helpful to have a broad powerband to give yourself some flexibility in how you exit a turn.

StiLLmatiK

iTrader: (1)

Was this the Mines time attack R34. That thing is vicious and I think was built with throttle response in mind

Alizia

iTrader: (1)

The headers look like intestines with the bends and that fleshly looking wrap lol.