I was cruising SF Bay Area shops looking for a tuner. I saw Turbo Hoses had Andy's SM2 (SSM) FD on the site under tuning services and got exited.

I called them up to solicit their services only to be told "we don't dyno tune rotaries because they blow up."

That pretty much confirmed for me they were a shop that knew their stuff and my interest was piqued and started looking at their products.

They had a 15 deg bend intercooler hose that I have been looking for for 8 years (AEM had a part# and everything and said they didn't really make them) to replace a kinked straight section I am using now.

They also had a cool 6" to 3" velocity stack for use with a 6" inlet filter.

I bought both! I just installed the velocity stack with a K&N 6" inlet by 10" long filter replacing my little 3" inlet 9" long filter. The filter I chose was big as I could fit without reworking my set up.

 

Turbohoses has nice stuff and do great fabrication work. Hoover welded Ti on my exhaust a few year ago. How many people do that?? I have their 6" to 4" intake piece and it has been great.

I had my car tuned their awhile ago, but by a different tuner. We wanted to use Turbohoses load dynojet.

-Andy M.

 

I did a before and after data log on the same exact section of road with the same long freeway drive to it to stabilize temps and same conditions (not too much time in between) to see if it did anything.

5th gear boost went from 1.4psi @ 1,900rpm on old filter to 2psi @ 1,900rpm on new stack/filter and stayed ahead at least 1/2psi boost all the way through the pull, 11.5psi by 3,000rpm and full 14psi boost @ 3,300rpm.

On the second pull there were noticeably fewer cells with the same rpm in the 1,800 to 2,000rpm range so that extra boost was helping acceleration.

Worth it to me just for the looks and knowing I can't stuff a bigger filter in there, the extra performance is icing on the cake - lol.

Turbo spool and BAC valve are noticeably louder. I can hear the turbo whine now above the din of the slick tires and noisy '044 pump at a steady speed freeway cruise 65mph @ 11% throttle.

 

I'm still amazed at how you fit that filter in there...by the way how much did that run you? And did it come with that reducer?

 

BAC valve is loud?

This is hilarious!

 

interesting v mount set up. looks not very affective with that intercooler at that angle

 

I'm still amazed at how you fit that filter in there...by the way how much did that run you? And did it come with that reducer?

The reducer is the "velocity stack"- pretty much the reason I did the filter change. TurboHoses.com velocity stack kit $95, K&N filter $49.95.

BAC valve is loud?
Controlled with the Haltech E6K it is very loud. The plunger sound reverberates out the intake and is much louder than the exhaust. I have played around with setting it to different frequencies, but haven't been able to silence it.

I have to say though when I first put the set up together 8 years ago and I cranked the key to on and the fuel pump and BAC cycled it sent a chill down my spine as the RE Amemiya FC2000 that set a 59 sec Tsukuba lap that inspired me to build the FC had a Motec that sounded just like it cycling the BAC on key on.

 

interesting v mount set up. looks not very affective with that intercooler at that angle

I say it is a "Horizontal Mount IC" and not a "V-mount" because the intercooler funtion is completely separate from the radiator.

The IC has its own separate inlet duct cut in the front bumper with ducting that curves up IC core. It would work fine if you removed the radiator completely without blocking any resulting hole.

It is kinda like how air gets to your engine in the intake manifold, it does have to turn, but the pipes help ~.^

It works really well!

The radiator is a big 26" wide by 19" tall by 3" thick Griffin that shares the stock bumper opening with a front mounted oil cooler.

I had previously wished I had gone with a 15" tall radiator instead so the IC would be angled back more for more area behind it for venting and less angle in the duct, but this last hillclimb with all the traction I had coolant temps actually came up fairly high and I was glad I chose the big radiator.

 

IC duct intake is the upper one cut in the rubstrip

IC duct exit to IC face


No ducted hood yet! Thinking about one now that car is pretty much just raced and don't need ultra sleeper status like when it was daily driver.

 

What turbo do you have? A lot of the turbos with 4" inlets have a velocity stack built into the design of the inlet. My 60-1 T04S had that. You could see a taper in the inlet design. See attached pic. The one on the left is the T04S, it has a smooth velocity stack built into the inlet. The one on the light is a T04R. It has a larger wheel but the same size inlet, so there is much less room for a velocity stack effect.

Try 244 Hz. The FD BAC valve runs at 244 hz according to training manual page F-45. I know for a fact that the FD Power FC can drive the FC BAC valve in functionally the same way, I am doing it right now on my T2. Therefore it stands to reason that the FC BAC runs at 244hz or very close to it. I noticed the default frequency is 500hz in my version of Halwin.

 

What turbo do you have?

BNR Stage 4 which is a S5 based stock hybrid. 60-1 HiFi comp housing, which is 2.75" inlet.

Try 244 Hz
I will see what I can do!

 

So, looks like 4ms is the correct time for 244 Hertz?

I think I remember BAC being silent there, but for some reason I thought it was not working.

I think I used the ms that others had used on FD. I will try 4ms.

 

welll at least your honest. i think any intercooler setup besides top mount an front mount works great. And i like your carbon fiber work my room mate will be doing some custom carbon ducting like yours. here is my set up. with a full custom koyo radiator that is 27 inches wide and 19 inches tall 2 core.

 

yeah they use the same numbers for everything actually

 

I got the FD BAC set up at 4ms and I cannot hear it now when I key the ignition on from inside the car.

I can still hear it outside the car with the motor running when it comes on but it is much quieter and has more of a ringing BrrringBrrringBrrring sound to it instead of the loud harsh BrakBrakBrak sound it had.

Perhaps I just get resonances set up very easily in the intake since I have few bends, short tubes and it is all polished inside with smooth transitions?

I was able to lean out and refine my coolant correction map now with the more fine BAC control (10x the frequency) once I optimized the rest of the BAC parameters.

Thanks guys for the BAC knowledge.

 

BTW it sounds bad *** revving the engine now with the velocity stack on their. Very big sucking sound.

 

Nice to see there is room for improvement on your car...or at least there was

Btw, I too had the load BAC valve noise resonating through the filter with my e6x. No way to get rid of it.

 

on their

LOL- pokes fun at himself. Ouch, mind the eyeball.

There is always room for improvements, but in general I am having too much fun learning to drive it now to put much time in working on it.

 

nice! I have a similar 4" to 6" stack coming for my T04R, looking forward to running it! BTW, what's the K&N part number for t hat big 6" filter?

 

That filter is KNN-RU-3280.

Measure the space you have because they do make larger ones. I think the largest 6" inlet K&N I saw was 24" long...

 

What is this loud BAC sound people speak of? I don't think I've ever even heard mine?

 

It is the sound of the bypass air control plunger opening and closing its passage in the FD upper intake manifold right behind the throttle body.

It reverberates out the intake. It is kinda like of you smack the open end of an empty beer bottle with your palm repeatedly and rapidly.

 

You don't have the fd uim. Both Blue TII and I do, or at least I did.

 

Nice . I'm in love with your car, btw .