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Location:
Adelaide
Registered:
September 2003
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Changing position of TB on inlet manifold
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Thu, 22 January 2004 01:28
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Hiya,
For future mods on my 7M-GTE, I am planning on relocating the TB to the end of the manifold (a la 1JZ/2JZ) rather than in the middle (current stick setup).
Anyone know of any issues with this, or done the grafting of a 1JZ/2JZ upper manifold on a 7M lower section (or similar) ?
The main aim would be to shorten the intake path as part of a aftermarket EFI upgrade in the future
Cheers
Michael B
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Location:
Perth
Registered:
October 2002
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Re: Changing position of TB on inlet manifold
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Thu, 22 January 2004 02:11
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Have a look at the Turboworx Mk3 with the massive turbo (was in Zoom late last year, I think). They used the stock 7MGTE throttle, relocated to front of inlet manifold - can't remember where they sourced the manifold - but I'm pretty sure it was some sort of Toyota stocker. I can dig up the article tonight, if ya want.
Justin
JZA61
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Location:
Adelaide
Registered:
September 2003
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Re: Changing position of TB on inlet manifold
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Thu, 22 January 2004 02:13
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Hiya Justin,
I'd appreciate it as I don't have that copy of Zoom
Cheers
Michael B
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Location:
Perth
Registered:
October 2002
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Re: Changing position of TB on inlet manifold
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Thu, 22 January 2004 02:48
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No worries. Ya have a fax no? I can send you the whole article. He's running a T51 and some insane power figures (500+rwhp?) that puts all of us JZ snobs in our places  . It's pretty impressive. Just a pitty it's still stuck in a Mk3  .
Justin
JZA61
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Location:
Adelaide
Registered:
September 2003
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Re: Changing position of TB on inlet manifold
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Thu, 22 January 2004 02:53
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You have a PM
Cheers
Michael B
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Location:
Brisbane
Registered:
February 2003
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Re: Changing position of TB on inlet manifold
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Thu, 22 January 2004 04:07
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if you don't get the plenum shape right you might end up starving runners farthest from the TB?
probably not an issue under boost, but could be problematic under light/cruising driving.
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Location:
Perth
Registered:
October 2002
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Re: Changing position of TB on inlet manifold
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Fri, 23 January 2004 02:12
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Doh! I forgot to bring it in to work. Will try again on Tuesday.
Anyway, it was a full custom job on the 500+rwkw 7MGTE Mk3. Also was reading about a supercharged 1JZ lastnight. They used a 7MGTE plenum because its bigger and for the crossover. Which makes me think that going the other way may not be so smart.
Hope this helps some.
Justin
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Location:
Adelaide
Registered:
September 2003
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Re: Changing position of TB on inlet manifold
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Fri, 23 January 2004 02:18
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Hiya Justin,
No probs. Interesting comment on the supercharged 1JZ. I'm not going mega horsepower, but plenty of engines use the front TB vs the centre feed.
Interestingly, the new V6 that is coming on the next Crumpledore uses a front mounted TB but the two side entrances to the plenum go to the centre.
Oh well, some reading to do
Cheers
Michael B
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: Changing position of TB on inlet manifold
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Fri, 23 January 2004 08:35
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A couple of guys (I think) have done this on a 1GGTE. They claim its been good, although I can understand the idea of starving the farthest runners of air. Seems to work on quite a few FWD cars though.
Have you thought of having a new pipe made up similar to the factory 1G cast pipes or do you have no room?
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Location:
On your mum!
Registered:
May 2002
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Re: Changing position of TB on inlet manifold
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Fri, 23 January 2004 09:04
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The "dangerous" problem associated with mounting the throttle body to the front of the plenum is NOT starving the runner farthest from the T/B, but rather one of it getting too much air. This can cause an issue of running too lean (duh).
This is why most aftermarket plenums are tapered away at the rear. That is my understanding anyway.
Think of it if you were to remove the back plate of the plenum, then 95% of air blown into the throttle will be blasted straight out the rear opening (of course this is simplified, but you will see that the flow of air is biased toward the rear of the chamber).
I made a new chamber for my 3T GTE with the throttle at the front and I can say that the improved throttle response was hard to ignore.
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: Changing position of TB on inlet manifold
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Fri, 23 January 2004 09:40
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Sorry, my bad, thinking one thing and saying another 
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