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intercooler and blow-off valve/ bypass valve setups


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17 replies to this topic

#1 suba

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Posted 23 December 2003 - 10:13 PM

okay, i'm getting ready to start upgrading the rx, plans include: intercooler, boost controller and blow-off valve or bypass valve.

but what i was wondering is, what intercoolers have you all used, and what ones seem to be best? also, blow off or bypass? money is a major issue and i'm going for performance, and simplicity and could care less about sound and looks. what do you suggest? thanks

p.s. i found a 3000gt bypass valve on ebay for $25, a bosch bypass for $40 and a tyfoon (?) bov for $50 (new).

#2 Danbob99

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Posted 23 December 2003 - 10:32 PM

you should try and get ahold of SubaruTex. He has an Rx that he has done the intercooler, mbc, and others to it. As far as i know he used a wrx intercooler, workers good from what i've seen.

#3 rallyruss

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Posted 23 December 2003 - 11:32 PM

I used a 1.8t vw jetta intercooler. and the bosh bypass valve.
the bypass valve became rather anoying after a while so I disconected it. sounded like a wookie in pain.

blow off valves tend to mess with the mass air flow meter signal. I let my bypass valve vent to atmosphere one time. It did not run as well.

I will try to find a pic to post later.

#4 calebz

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Posted 24 December 2003 - 01:15 AM

I would be very interested in seeing how you had that plumbed.. would also be interested in taking that bypass valve off your hands if you aren't going to be using it . I have always liked the sound of a wookie in pain:D

#5 rallyruss

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Posted 24 December 2003 - 01:49 AM

I have think I have a spare bypass valve from a saab. if you are serious let me know.
heres the best pic I could find.
the outlet from the turbo is a ofset and increase in size. that and the hood scoop were the hardest to do.

Attached Files



#6 Scrub2k

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Posted 24 December 2003 - 04:28 AM

Im using a Ford Thunderbird Turbo Coupe I/C in my car seems to fit well, i just need to figure the best way to plumb it in, and then find a good hood scoop to put on.

#7 Dennis ex24

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Posted 24 December 2003 - 08:58 AM

i have a thunderbird IC on my XT...

word on the street is that they are supposed to be some of the most effecient stock ICs out there, however im not sure its the best fit.

the IC to turbo pipe goes of to a slight angle on the IC, while the turbo that is on my car (a legacy unit) goes straight up...this makes for an offset when you try to join them with plumbing - i may not be reaching the cars full potential HP wise because of the way the 2 pipes meet.

also on my car is a volvo bypass valve and a turbo XS manual boost controller, you can go in my profile and click on the link to check it out.

#8 Skip

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Posted 24 December 2003 - 09:02 AM

Please excuse me for posting this so often,
I am sure many of you are v.tired of seeing it.
The BPV is from a Volvo and makes very little noise when bypassing. IC from Mitsu Starion

Posted Image
Email me for details or simply post here.
Hope this gives you some ideas


#9 calebz

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Posted 24 December 2003 - 09:09 AM

I Love seeing that pic. Unfortunately, most of the labeled items aren't really visible.. even on my 21 inch monitor

#10 Subarutex

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Posted 24 December 2003 - 02:02 PM

WRX intercooler w/ stock wrx bypass valve. I had my bypass vented atmospherically forever. Now I run it recirculating. ONly difference is it doesn't bog down when you come to a stop.

Look on my site for pics.

#11 Myxalplyx

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Posted 24 December 2003 - 09:17 PM

Originally posted by Skip
[B][color=darkblue]Please excuse me for posting this so often,
I am sure many of you are v.tired of seeing it.
The BPV is from a Volvo and makes very little noise when bypassing. IC from Mitsu Starion



Hey Skip,

I never get tired of seeing that work of art. It shows us youngins how to do things the right way. I react the same way every time I see it. :eek: :slobber:

#12 Snowman

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Posted 24 December 2003 - 10:42 PM

Hey skip, what does your strut brace attach to and have you noticed if it makes any difference in handling?

Just wondering, since mine is attached to the innermost strut bolts and I can't really tell from the picture where yours goes to.

#13 suba

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Posted 25 December 2003 - 12:22 AM

so, what have you all used for piping on the intercoolers?

#14 Scrub2k

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Posted 25 December 2003 - 12:25 AM

I Plan on using some 2" Plastic ABS piping from Homedepot(the Black Stuff), and some Rubber Intercooler Hose that I Seen at Summit Last week.

#15 pleiades

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Posted 25 December 2003 - 09:47 AM

Not intercooled yet, but I do have this nice ricey BOV! :)

Posted Image

Posted Image

#16 Skip

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Posted 25 December 2003 - 10:15 AM

As mentioned it is generally not advisable to put a BOV on a MAF equipped car. Acura's and later model Subarus have a MAP sensor which is a horse of a different air metering system. Nice work though Pleiades.
I see you also have a mechanical temp gauge fitted to the heater hose line.

Thanks Caleb and Kevin for the props.
Couple other questions/answers
Caleb Unfortunately, most of the labeled items aren't really visible
Thanks for pointing that out, I will work on a page with links to each element describing the function and build process.

Snowman what does your strut brace attach to and have you noticed if it makes any difference in handling
It is attachecd to the lugs for mounting the spare tyre carrier.
I preloaded the brace app 12mm, using a porta power. Yes the car feels much better in the twisty bits and a shimmy I had at app. 65 MPH is gone.

Suba so, what have you all used for piping on the intercoolers?
I used silicone hose from http://www.hosetechniques.com/
for the intake pipe
Posted Image
And truck radiator hoses with anti-collapse springs fitted. I had full sized templates and went to an auto store with pipes hanging on a rack and bought the ones that fit my templates.

Hope this helps


#17 pleiades

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Posted 25 December 2003 - 10:37 AM

Skip, thanks for the props. I honestly have had no problem with the BOV. The car doesn't stumble, doens't hesitate, doesn't try to die when coming to a stop. Who knows.

With all the work you have put into your car, why haven't you switched to the spyder intake? (just curious)

#18 Myxalplyx

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Posted 25 December 2003 - 07:55 PM

Originally posted by Skip
Suba so, what have you all used for piping on the intercoolers?
I used silicone hose from http://www.hosetechniques.com/ [/B]



Excellent info Skip! I do no know why I never bothered asking info abou the hoses here. I've been looking for a place to purchase silicone hoses and rubber fittings for a long time. The hoses will help a good deal in future projects. Thanks again!




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