Most/All modern engine ECUs will pull timing in relation to the IAT. As an example, the Subaru ECU pulls 4 or more degrees of timing when IAT reaches 150is degrees F. That is a pretty big hit on performance. Of course - the purpose is to protect the motor from knocking because of the warmer (less dense) air charge.

 

If its the coolant, have you heard about Engine Ice? I've thought about running this. If your willing to experiment

 

that seems interesting, but see this note on their site:

*A note on modern street automobiles:

Newer model street automobiles are equipped with a massive amount of electronic and computerization equipment to keep your passenger car operating at what the manufacturer wants the engine to operate at. One analogy we use, and we agree it's a bit simplistic, is that even if you filled your radiator with ice cubes, the computer system would hold the thermostat and monitoring equipment until it reaches its pre-programmed operating temperature. Bottom line is, you'll probably only reduce the overall temperature by a couple of degrees due to the thermostat opening and closing or "feathering" in order to maintain its preprogrammed and desired temperature. Keep in mind; we are talking stock, unmodified passenger cars, not racing cars.

 

I'm completely blown away by the 391 with just a Borla cat back and Tom's filter. That's awesome. I cannot wait to see the post-headers results! Wow...

 

I think that more accurate data should be collected about coolant temps before putting things in your coolant. The car is designed to operate at a certain coolant temperature and you may hinder performance and be wasting your money buy adding things like that to your coolant. I've always heard adding a drop of dawn dish soap has the same effect as this stuff.

I'm sure the issues are more to do with IAT, and not coolant temps.

 

Nice Runs JB, I have practically the same mods I'm wanting to dyno my car curious as to what it is making to the wheels. I thought smoothing was set to 5. I will have to check out rage tek. Anyway looking forward to your post headers dyno results. Anyway since you and Slay are local shoot me a PM guys maybe we can all meet up.

 

Props to you. Thats almost the same whp as I got with headers on the same model dyno.

Guess its time for a 1/4 mile to back that a$s up

~Dv8

 

Glad I'm not the only one that noticed...

Look, I love seeing Accurate HIGH Rwhp Dyno numbers... But once in a while reality check has to set it in....

~ Joe Z

 

^ all you guys are haters Why can't you be happy he has a fractory freak

 

Because it is simply not the case...

Trust me I'm not hating.. Just trying to educate members on realistic data for the IS-F

Cooling down the motor during our exhaust R&D in 2008 gave us a 39 rwhp gain...

But I would never state or even mention that our exhaust made almost 40 Rwhp.. LoL ...

The realistic number was and always will be approx 20-22 Rwhp in gains, for a nicely fabricated Full Cat Back exhaust system..


Also, my opinion is just my opinion.. But if the OP wanted, he can easily graph a dyno sheet showing over 400+ Rwhp..

Best Regards,

~ Joe Z

 

I would say that ~360 rwhp with a catback exhaust is believable for this car.

I doubt 391 is possible...but it does sound cool to say

 

By "realistic data" do mean that those are not the type of numbers to expect in real world driving conditions, or was is there something I am misunderstanding?? Thanks Joe!

 

I thought ~360 rwhp was basically our stock numbers?

 

Agree those numbers seem a little inflated maybe the smoothing has to be set @ 5. Either way props to JB.

 

Stock are rang from 350 to 360rwhp, so with intake and exhaust 375 to 385 rwhp max