[agtuning51]

having performed the described mod last night. The air temp this morning was about 65 with about 20% humidity. I ran the car both through the twisty's in the hills where I live and then up on the freeway and back home again.

I have to say I really like the result. The car perfoms much better in both the auto and manual modes, without using the Sport setting. Yes there is more power and low end torque, but more importantly for me is that there is a faster throttle response thoughout the RPM band. Just like most things, allow it to breathe easier and it will perform better.

If there was a drop-in high flow after market air filter out there we'd all jump to buy it IMHO. Isn't this really the same thing but for free? I will keep an eye on my air fliter and will expect to have to change it out sooner then reccommended with this mod. Not sure there is any possible downside to this mod? Would enjoy hearing others experience with this!

Hey, about the drop in performance air filter, I made some measures calculations and I believe found one . Will post update soon as it gets here and test fitted. By the way there's no company making one for the F.

 

[IZZY]

Hey - another ISF owner who also has a Mustang!! I'm not the only one!!! I suspect yours has been "breathed on" a bit. My "other ride" is a '97 Mustang Cobra; stock, except for Magnaflow Exhaust.

 

[Supraman16]

Hey, about the drop in performance air filter, I made some measures calculations and I believe found one . Will post update soon as it gets here and test fitted. By the way there's no company making one for the F.

Definately keep up updated!...Darshana S...

 

[agtuning51]

Definately keep up updated!...Darshana S...

Well guys finally is here I tested for a few miles around my house last night. I did not feel that much of a power but it sounds awesome, maybe the ecu needs time to know the new mod(more air). Later today will double check the airbox for proper fitment.

 

[Supraman16]

Well guys finally is here I tested for a few miles around my house last night. I did not feel that much of a power but it sounds awesome, maybe the ecu needs time to know the new mod(more air). Later today will double check the airbox for proper fitment.

What was the filter you got?

 

[Fig]

no VAC plug necessary

In other news, the vac plug is not necssary at all. You can simply unplug the solenoid. Since it is not a critical system, there is no current sense on it. Works great

After looking at the intake system it is my conclusion that the factory macroni pipe is not restrictive at all. Even the damping mechanism is very minimal. I think I did figure out what can be improved...and that is the airbox/ram air. I will keep you gys posted and start a thread once I get further along. Feels good to get into the engine bay again and tinker

Fig

 

[Supraman16]

In other news, the vac plug is not necssary at all. You can simply unplug the solenoid. Since it is not a critical system, there is no current sense on it. Works great

After looking at the intake system it is my conclusion that the factory macroni pipe is not restrictive at all. Even the damping mechanism is very minimal. I think I did figure out what can be improved...and that is the airbox/ram air. I will keep you gys posted and start a thread once I get further along. Feels good to get into the engine bay again and tinker

Fig

Fig,
I thought about doing that initally also, but I wasn't sure if it would trigger a check engine light so I decided to "fool" the system into thinking that nothing was disconnected. But I don't know too much the stock ECU (I don't think anyone does) to know whether that stock airbox plug does more than just control the secondarly intake flap...hopefully it doesn't also have some part to play in the air fuel ratios?? I doubt it, but I was just playing it safe by doing the vacuum cap mod rather than disconnecting the connector. But anyway, do you notice a difference in the throttle response also?...Darshana S...

 

[Fig]

I would highly advise against this modification. The problem with the IS-F is not down low (where I have reached sixty in 4.2 seconds numerous times) and where there is an abundance of power on tap early but rather after 5,000 rpm's where we have seen torque curves drop off significantly, and where both intakes are fully open. Voiding your warranty to hear the often talked about "whoop" 1,000 rpm's sooner is simply idiotic, and something I would expect from Chevy iroc or Ford mustang owners!

IROC- Itailian Retards Out Cruising

you are not going to void a warrantee for a system that is not in the "metered" airflow path. This is all prefilter airbox modifications. I took the whole thing apart last night and this is nothing worse than what an open element filter will do.

The fact of the matter is that this is exactly the type of thing that Lexus puts in to preserve luxury. Its just a trap door that opens the filter to the engine bay (not even the fender.)

What is your technical argument?

Fig

 

[Fig]

Fig,
I thought about doing that initally also, but I wasn't sure if it would trigger a check engine light so I decided to "fool" the system into thinking that nothing was disconnected. But I don't know too much the stock ECU (I don't think anyone does) to know whether that stock airbox plug does more than just control the secondarly intake flap...hopefully it doesn't also have some part to play in the air fuel ratios?? I doubt it, but I was just playing it safe by doing the vacuum cap mod rather than disconnecting the connector. But anyway, do you notice a difference in the throttle response also?...Darshana S...

Throttle response, possibly. The only to way to know is to do a few runs on the Gtech and average the findings. The A/F ratios are purely calculated based on the hot wire sensor and MAF in the intake tube just after the filter. you could not base anything off of an inprecise flap opening and closing on the front side of the filter. I will post pics later.

 

[agtuning51]

What was the filter you got?

http://www.clublexus.com/forums/showthread.php?t=386924

 

[Fig]

OK I should have a cross for the filter in a dry high flow drop in from Amsoil. I will confirm next week.
Fig

 

[Dean]

Asked K & N about using their air filter that fits into >

the IS-F though it was designed for the VW Cabio's and here is their reply:

"Dear Dean,

Thanks for contacting K&N. We have not released the air filter application for the IS-F. The problem with using an air filter which is not designed for the vehicle is the lack of complete seal. At K&N we designed the air filter from the air box to ensure a complete seal, so even if an existing filter with the correct length and width fits into the air box , it does not guarantee a complete seal and dust may get through the gaps. We are currently looking for an 2008 IS-F so if you would like to let us use your vehicle for R&D please contact K&N at 1800-858-3333. Thanks for writing.

George Hsieh
Tech Support
K&N Engineering
[email protected] "

I'll contact them tomorrow about their requirements to use my IS-F so we can get an air filter from them... Will keep you posted....

 

[Fig]

great Dean, keep us posted, I will take pics of the stock airbox fitment when I get my amsoil dry filter.

 

[BigMikeISF]

Thanks Dean! I'm glad K&N got back to you now it's time to see what they come up with for the F

 

[Dean]

I thought about it some more and called K & N today >

to talk about their filters and their possible use of my IS-F to make an air filter. I was told they have a mold of the inside of our air box already and are waiting for some prototypes to be finished. They will need another IS-F to check the pre-production fit in about 6 weeks or so. I left my contact information and said I'd be willing to help and or to call me so I can buy a filter. They assured me that they would be in touch... We'll see!

 

[BigMikeISF]

^Awesome news! Thanks for following up with them and offering your F! Keep in touch and let us know how it goes

 

[omarab12]

Im guessing doing this mod + an aftermarket intake will noticeably increase power... when i say noticeably i mean relatively as opposed to intake itself, what do u guys think?

 

[drdoug75]

Awesome mood....seems pretty simple! Beat this would sound great with the new exhaust.

Any videos ....come on would love to hear

 

[billandbill]

Guys I did it this morning and I'm never going back to normal, love what it did to the car, as far as I'm concerned they should have sold us the cars this way, and yes no engine light yet, hope never.
Thanks a million Supraman16.
Just out of curiosity, how did you come up with the idea.
People you have to try it, it took me 20 sec.

 

[disordr]

I want to try this out on my F.
What kind of vacuum cap does one get for this?