[billandbill]

I used electrical tape for now

 

[Fig]

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.

If you read my comments you can just disconnect the solenoid connector and it will achieve the same thing. No tape required

 

[billandbill]

After spending the whole day with both of the intakes working the way they should have since day 1, I can tell you guys why Toyota never did it this way.
The car is actually way lauder, suits me just fine.

 

[Fig]

unplug the connector on this guy...done.

 

[disordr]

Thanks for the details Fig!

I did the mod tonight. First I took out the car (before doing the mod) and drove around slowly letting it warm up. I'm still not used to all the power, especially since I was also driving the is300 all day today.
Then I came back home and did the mod. At first I didn't really notice much.
I heard a bit of fluttering on the lower end. After driving the car on Sunset, from PCH to Hollywood I finally started to hear the difference. I put the car in sport mode and definitely noticed it feel a bit more pickup off the line. I also attributed this to the fact my fuel tank was on Empty.
I filled up the tank, kept it in sport mode, and yah, I do notice the difference.

I'll be keeping this mod on.
Are there any drawbacks to keeping this on? Higher fuel consumption? Additional wear on the engine? The former I'm not so concerned about, the latter a bit more.

 

[Supraman16]

Hi Guys,
I'm glad you like this mod. I've had it done now since I originally posted up this thread and I have yet to find a negative effect from it. Gas milage is the same, the sound is incredible...even more so in combination with the JoeZ exhaust I recently got, and more importantly, a bit more noticible power in the low end. However, the only thing I have found out and want to advise everyone one against is getting a drop in air filter, like a K&N filter...DON'T DO IT...with or without this mod! I had the K&N filter and it felt like it was making more power initially, but then it went away...likely when then ECU adjusted to it and the MAF got contaminated with the air filter oil. I started having really poor gas mileage and this promted me to put back the stock filter (along with the fact there was a thread on CL about how the K&N filter as causing problems to other members IS-F's). But yeah, I've had this mod for awhile and still nothing bad that I have experienced...Darshana S...
PS. I have mine done the original way...with the vacuum cap rather than disconnecting the solinoid. I didn't want any water or debris getting into the open connectors.

 

[Fig]

Hi Guys,
I'm glad you like this mod. I've had it done now since I originally posted up this thread and I have yet to find a negative effect from it. Gas milage is the same, the sound is incredible...even more so in combination with the JoeZ exhaust I recently got, and more importantly, a bit more noticible power in the low end. However, the only thing I have found out and want to advise everyone one against is getting a drop in air filter, like a K&N filter...DON'T DO IT...with or without this mod! I had the K&N filter and it felt like it was making more power initially, but then it went away...likely when then ECU adjusted to it and the MAF got contaminated with the air filter oil. I started having really poor gas mileage and this promted me to put back the stock filter (along with the fact there was a thread on CL about how the K&N filter as causing problems to other members IS-F's). But yeah, I've had this mod for awhile and still nothing bad that I have experienced...Darshana S...
PS. I have mine done the original way...with the vacuum cap rather than disconnecting the solinoid. I didn't want any water or debris getting into the open connectors.

Yeah teh K&N and MAF do not get along. That is why the amsoil filter was my choice. Completely dry and easy to clean. So far just turn 8K on the clock and no looking back.

Fig

 

[lowrider]

I've had my K&N now for 2K miles. I also have the JoeZ intake tube. So far no issues with my K&N.

BTW, I've used K&N for years. My last car, a G35 coupe had a MAF, and worked fine for 6 years with a K&N. It was cleaned and reoiled countless times.

Lou

 

[nj1IS-F]

go get the nissan gtr. forget isf and mustangs. bye bye!!!!!!!!!!!1

 

[Supraman16]

I've had my K&N now for 2K miles. I also have the JoeZ intake tube. So far no issues with my K&N.

BTW, I've used K&N for years. My last car, a G35 coupe had a MAF, and worked fine for 6 years with a K&N. It was cleaned and reoiled countless times.

Lou

Hi Lou,
May I ask what your gas milage is? The reason I asked is because poor gas milage was how I found out that the K&N Filter was not a good idea. With the K&N Filter I was consistantly getting no where better than 16mpg. After cleaning the MAF and reinstalling the stock filter I started getting 19-21mpg. I didn't actually notice or feel any oil on my MAF when I removed the K&N filter, but obviously, my IS-F was not happy with the K&N filter. I still got a K&N cone filter on my Supra TT and it has served me well for years, so I'm going to stick with it in the Supra, just not with the IS-F....Darshana S...

 

[oarngemig]

Yeah teh K&N and MAF do not get along. That is why the amsoil filter was my choice. Completely dry and easy to clean. So far just turn 8K on the clock and no looking back.

Fig

Fig, can you tell me where i can get the amsoil filter?

 

[lowrider]

Hi Lou,
May I ask what your gas milage is? The reason I asked is because poor gas milage was how I found out that the K&N Filter was not a good idea. With the K&N Filter I was consistantly getting no where better than 16mpg. After cleaning the MAF and reinstalling the stock filter I started getting 19-21mpg. I didn't actually notice or feel any oil on my MAF when I removed the K&N filter, but obviously, my IS-F was not happy with the K&N filter. I still got a K&N cone filter on my Supra TT and it has served me well for years, so I'm going to stick with it in the Supra, just not with the IS-F....Darshana S...

Yep, I'm getting between 20 and 22 depending upon how I drive. This, IMHO, is great mileage for a car with this potential.

Lou

 

[bjg403]

Hello Superman16 this is BJG403 I have a 09 isf i tried it also .I do think there is a little more power on the low end.Did you cap off the other end.

 

[Supraman16]

Hello Superman16 this is BJG403 I have a 09 isf i tried it also .I do think there is a little more power on the low end.Did you cap off the other end.

Hello,
Yeah, I capped off the other end so no junk goes in the actuator. Glad you like the mod...Darshana S..

 

[isflojo]

Are there any problems so far with this mod? There must be a reason why the car has this part to begin with. If we take it off, what purpose are we defeating?

 

[Supraman16]

Are there any problems so far with this mod? There must be a reason why the car has this part to begin with. If we take it off, what purpose are we defeating?

I've had it for several months now and still no issues whatsoever. I believe that the reason that Lexus did this was due to keeping the car quiet in the lower RPM's. I don't think that there is any performance reason from keeping the secondary intake closed in the lower RPM's...Darshana S...

 

[retrosolutions]

Fig, please post the p/n for the amsoil filter if you kindly would, thanks

 

[omarab12]

do we have to disconnect both wires/tubes or only one and if so which one? plug it back in and we're back to normal????

 

[retrosolutions]

after a week of having done the solenoid disconnect, and driving around my impressions are as follows:
1) off the line low rpms - seems more responsive
2) mid range - might have lost a little bit of torque in the normal driving band, just seems a little less responsive to me. Although, given the better volumetric efficiency this should not be the case unless the ECU/O2 sensor are playing a role, but this should be a simple closed loop feedback, no?
3) high end - well, no change because its the same as before
4) sound is definitely more smile provoking now

A very small side note, I seem to percieve an eerie rythym between the intake and exhaust frequency. Its almost like one cylinder is more distinct, and the lag between the intake "pop" and the exhaust "pop" amongst those in the background are....well, subtly more noticeable. Just an odd observation I had.

Anyways, its worth the 2 secs. to disconnect and try it out for two days.

 

[Juanca]

I can't believe you guys missed this thread over CL, this is what I found about this mod last year...

Originally Posted by Juanca:
OK guys, I have hard data about this mod. I did it last Sunday and you can feel the difference right away. First of all you can hear the intake way earlier, from around 2K RPM. Just the sound makes you believe that your car is faster, maybe more HP I thought? So I went to the track today and tried my ISF. I did about 7 runs and I knew there was something wrong, my times were a little bit slower than 2 months ago, I was runing 8.7 at best in the 1/8th mile. Even though I could swear that the car was faster, the slips were saying otherwise. For my 8th run I decided to take this mod back to the way it was stock and I immediately picked up 2 tenths! I couldn't believe it so I did 6 more runs and I ran consistently 8.5 (all runs). My trap speed also jumped from 84MPH to 86MPH. So I'm taking the intake back to the way it was, and I'll enjoy that lovely sound from 3600RPM, not before.

Originally Posted by Supraman16:
This is some great real world data. However, I do have a couple of questions:
1. Was the flap mod done RIGHT BEFORE doing the runs, then put back to stock after finding out the slower times, or was the flap mod done for awhile before doing the runs? The reason I as is to see if the ECU had properly compensated, for what I would assume increased air from the opened flap.
2. Are you still running the stock air filter, or an aftermarket one (K&N or Amsoil)?
3. Have you done the vaccuum cap mod as I showed in the intial post, or just disconnected the plug for the flap accuator? The reason I went with a vacuum cap mod rather than disconnecting the plug was because of my concern that disconnecting the plug may alter what the ECU was reading and change something around in terms of the A/F ratios or something else. By just doing a vacuum cap to plug it off, it doesnt change anything electrical, I would assume just fools the ECU to thinking that it's still stock. Once again, this is all hypothetical.

I returned my airbox to stock after reading your post last night and driving the car this morning, to me at least, seems sluggish compared to with when the flap was open. Fig also showed a 5hp gain and to me, I agree with this that there is a increase in HP and torque with the flap open. However, I know that Fig also has a Amsoil filter in place.

Inregards to why the factory that this intake flap was put into place, I believe it to be mainly for the purposes of perserving the luxury and quietness of the car in the lower RPMS. I don't believe it to be due to performace reasons...once again, hypothetical. I don't see how having the flap closed in lower RPMS can increase the HP or torque, or for that matter increase it in the higher RPMS when it opens.

Originally Posted by Juanca:
Here are my answers:

1. I did the mod last Sunday and drove that way for about 250 miles before I went to the track.
2. My car is completely stock except for tints.
3. I did the mod just as you showed it on the first post, so it's confirmed, I used a vacuum cap.

As I said I thought my car was faster. When I went to the track 2 months ago the air temp was about 86F, so this last Wednesday I was expecting better times because of this mod, and also because air temp was 66F. Two months ago I was runing [email protected] in the 1/8 mile, and you can imagine my surprise when this week my best run out of the first 6 passes was [email protected] I wondered if the mod had something to do with being slower when I should be faster (at least because of the cooler night), so I removed the cap and connected the hose back. I had another pass right away and bam! [email protected] The following 5 passes were similar. This experience showed me that the mod doesn't help performance-wise.

Originally Posted by anajri:
what were youre 60 foot times.. maybe you had more wheel spin during the launch ? or maybe que amsoil filter was ofsetting any negative drop need more testing......

Originally Posted by Juanca:
My 60 foot times were always around 2.1, with and without the mod. Wheelspin is there, I can't avoid it, these stock Bridgestone don't help launching the car and the track isn't the best either.

I don't have any aftermarket part on my car, not even the air filter, I'm stock.

Originally Posted by stick:
20 degree difference in air temp.......good for intake air, bad for tire grip. The warmer day will have a hotter track and give better grip. Too many variables. I don't know if the mod works, but a more controlled environment is needed for testing.

Originally Posted by Juanca:
This is why I posted times before and after the mod. I basically picked up 0.2s in the 1/8 mile after pluging the vacuum hose back. These runs where done one after the other, during the same night, so conditions were identical.

Originally Posted by lobuxracer:
Sorry, but MPH trumps all. Better MPH means the engine is making more power. End of story.