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Old 08-26-2005, 01:15 PM   #1
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Default Fabbing an exhaust cutout w/ a throttle body

Just wondering if anyone has tried it out. i was thinking of using a 3" domestic tb instead of those electric ones that always break. Do you guys think it'll hold the exhaust pressure ok when it's closed?
Click the image to open in full size.
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Old 08-26-2005, 04:06 PM   #2
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Default Re: Fabbing an exhaust cutout w/ a throttle body (B18Flip)

Well they hold boost pressure on turbocharged cars without much problems and thats way more than your exhaust pressure is gonna be.
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Old 08-26-2005, 04:26 PM   #3
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Default Re: Fabbing an exhaust cutout w/ a throttle body (Flashmn)

but your intake isint over 1000 degrees
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Old 08-26-2005, 06:48 PM   #4
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Default Re: Fabbing an exhaust cutout w/ a throttle body (cstay)

Quote:
Originally Posted by cstay
but your intake isint over 1000 degrees
ding ding ding

U need steel y0
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Old 08-26-2005, 07:34 PM   #5
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Default Re: Fabbing an exhaust cutout w/ a throttle body (Flashmn)

Quote:
Originally Posted by Flashmn
Well they hold boost pressure on turbocharged cars without much problems and thats way more than your exhaust pressure is gonna be.
yeah i guess so

Quote:
Originally Posted by cstay
but your intake isint over 1000 degrees
true, but i'll try to put it down stream more so it's not as hot.....full-race geoff uses an aluminum catback so i think it should hold up.
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Old 08-26-2005, 10:27 PM   #6
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Default Re: Fabbing an exhaust cutout w/ a throttle body (B18Flip)

acually it holds up the heat perfectly well. i tried it with a Nissan 240 tb on my hatch and put it between the block and radiator, it held the exhaust in when closed,no leaks and i had it in there for about 5 months with no problems Click the image to open in full size. i say go for it
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Old 08-27-2005, 08:13 AM   #7
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Default Re: Fabbing an exhaust cutout w/ a throttle body (h kid)

The DMH electric ones have a 4 year warrenty on the entire unit. It'd have to be a pretty big TB to flow what you'd like anyways.

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Old 08-27-2005, 08:21 AM   #8
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Default Re: Fabbing an exhaust cutout w/ a throttle body (Blaze45)

Lol at aluminum not holding heat....how did anyone come to that conclusion?? HAHAIt will hold up fine...do it...I want to see it! LOL
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Old 08-27-2005, 01:57 PM   #9
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Default

some one over on sr20forums runs a tb cutout (NA application though)...bunch of pics and a vid in this thread Click the image to open in full size.

http://www.sr20forum.com/showt...utout

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Old 08-27-2005, 06:05 PM   #10
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Default Re: (Full-Race Javier)

its doable,
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Old 08-27-2005, 06:16 PM   #11
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Default Re: (Full-Race Javier)

ahh perfect! that's what i need
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Old 08-27-2005, 06:48 PM   #12
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Default Re: (B18Flip)

yeah then just use a string in the cab to pull it


hahahah this is HMT all the way. keep us updated!
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Old 08-27-2005, 07:18 PM   #13
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Default Re: (shortyz21)

i wanted to do one with this d16z tb i have but it has several holes in it that would leak the exhaust fumes around the throttle plate,anybody know of any cars with oem tbs with no extra holes to leak exhaust gas past the throttle plate?
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Old 08-27-2005, 07:22 PM   #14
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Default Re: (buckfittyone)

I have one on my car. I used a dsm throttle body.
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Old 08-27-2005, 11:12 PM   #15
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Default Re: (snowseeker)

awesome, i'll def trying this out Click the image to open in full size. Do you guys know of any 3" TB's that don't have the holes like people were saying?? If not i'll just zap the holes w/ the mig welder lol
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Old 08-28-2005, 09:29 AM   #16
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Default Re: (B18Flip)

Quote:
Originally Posted by B18Flip
awesome, i'll def trying this out Click the image to open in full size. Do you guys know of any 3" TB's that don't have the holes like people were saying?? If not i'll just zap the holes w/ the mig welder lol
yeah zap that Al. do you have a spool gun and pure Ar?
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Old 08-28-2005, 12:03 PM   #17
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Default Re: (dfoxengr)

Quote:
Originally Posted by Flashmn
Well they hold boost pressure on turbocharged cars without much problems and thats way more than your exhaust pressure is gonna be.
but boost isnt realized when the tb is closed.

Quote:
Originally Posted by B18Flip
true, but i'll try to put it down stream more so it's not as hot.....full-race geoff uses an aluminum catback so i think it should hold up.
there is no doubt a al tb will hold up. BUT not all the operating parts inside of tb's are al. you have spacers, gaskets, springs, etc. things that a prone to heat warping and cracking with the rapid heat up and cool down process w/ boosted cars AND the rapid heat up and cool down of al. then again the tb cutout will be under the car where airflow will be high..as far as placing the tb downstream more. you dont wanna lose the effect the tb gives. you want it placed where the exhuast heat begins to "cool" so that your down pipe and its "dump" will be efficient.

ps. i have never ever EVER talked to someone with an e-cutout that hasnt had problems. be it electric or manual.

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Old 08-28-2005, 12:20 PM   #18
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Default Re: (turbotommy)

Quote:
Originally Posted by turbotommy
but boost isnt realized when the tb is closed.
When you let off the gas from a full throttle run there is.
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Old 08-28-2005, 12:40 PM   #19
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Default Re: (k24em2)

eh i'm going to try it out, it seems that it has worked out for the people who have tried it
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Old 08-28-2005, 01:39 PM   #20
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Default Re: (k24em2)

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote &raquo;</TD></TR><TR><TD CLASS="quote">Quote, originally posted by turbotommy
but boost isnt realized when the tb is closed.

When you let off the gas from a full throttle run there is.</TD></TR></TABLE>
Right....and on cars without dump/blow off valves, pressure has to stall the turbine, go the other way and that takes fairly long to happen... (oh and I know its not good, people still do it)
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Old 08-28-2005, 02:48 PM   #21
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Default Re: (turbotommy)

Quote:
Originally Posted by turbotommy

but boost isnt realized when the tb is closed.

there is no doubt a al tb will hold up. BUT not all the operating parts inside of tb's are al. you have spacers, gaskets, springs, etc. things that a prone to heat warping and cracking with the rapid heat up and cool down process w/ boosted cars AND the rapid heat up and cool down of al. then again the tb cutout will be under the car where airflow will be high..as far as placing the tb downstream more. you dont wanna lose the effect the tb gives. you want it placed where the exhuast heat begins to "cool" so that your down pipe and its "dump" will be efficient.

ps. i have never ever EVER talked to someone with an e-cutout that hasnt had problems. be it electric or manual.
Yes the plastic spacers and washers and seals can melt. I pulled mine apart and removed all of the plastic. Sorry people, forgot to mention that. Click the image to open in full size.
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Old 08-28-2005, 05:50 PM   #22
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Default Re: (snowseeker)

Quote:
Originally Posted by snowseeker

Yes the plastic spacers and washers and seals can melt. I pulled mine apart and removed all of the plastic. Sorry people, forgot to mention that. Click the image to open in full size.
yup i'll def do that....btw how big is the dsm tb??
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Old 08-29-2005, 10:11 AM   #23
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Default Re: (turbotommy)

Quote:
Originally Posted by turbotommy


ps. i have never ever EVER talked to someone with an e-cutout that hasnt had problems. be it electric or manual.
i've been running a Quicktime cutout for about a year and a half with no problems yet.also installed a couple on people's cars with no problems.
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Old 08-29-2005, 06:37 PM   #24
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joey davis has been talking about doing this forever...he's had the t/b for a long time....i've always been interested in doing it...if he can get it to work alright
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Old 08-29-2005, 08:00 PM   #25
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butterfly type valves assemblies have been used in the turbo industry for a while with out a problem. these arent AL though. only thing is that the valves im referring too are used to impede flow and or raise exh mani pressure not the other way around....and they are $$$ Click the image to open in full size.

Click the image to open in full size.
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