im in the process of inquiring about the street fighter manifold (thanks Mr Krudd)
and i was curuius about the difficulty in adding another TB on the left side of the intake plenum.
i know i will need a aftermarker computer, to run the additional MAF,
and i have PMd Tim about it, and he says he will get back to me after he inquires with the manufacture
but im not sure on how the colliding air flows will behave in the plenum. anybody with any knowlegde on this?
ive have read that RPW have this as an option for their replacement Plenum
('looking at EZ Boy')

I dont know the technical stuff but i know the member CTHLU i think it was did that, had throttle body on each side of the intake will find ya a pic mate

Here u go mate, link to the thread by cthulhu about his coversion:

LINKY (http://www.aussiemagna.com/forums/showthread.php?t=23596)

Here you go found a pic i had

http://img527.imageshack.us/img527/3773/enginebay.jpg (http://img527.imageshack.us/my.php?image=enginebay.jpg)

I could be well wrong here....

But the pic that BJ31OS posted.....

Is that in contention for pointless mod of the year award?

it would be good if it was on the other side but having 2 seems a bit silly

I could be well wrong here....

But the pic that BJ31OS posted.....

Is that in contention for pointless mod of the year award?

Given that that car made over 200kw atw NA then probably not, was discussed in length in the thread i posted. From what i understand it ensures all runners get equal air which in turn increases power.

With that twin TB setup (to be honest I didnt spot the second TB...which is why I thought it looked a bit strange) he made 166kw.

As he said in his own thread - it didnt make much of a difference in the end, props to trying something new. I think it would be more beneficial with an ECU, and seperate air intake for the second TB.

I quite well understand the equal air to all runners part - just dont agree with how it was implemented on that car....or if its really all that neccasary on a magna.

yes i had the idea, of running 2 independant air intakes.
2 mafs and 2 pod filters behind the front bar.
only because i was curious to how difficult it would be to add the required bolt holes, and fitting, to the manifold before it was even cast.
and yeah tim says the prosequential piggy ecu, can run 2 independent MAF's

like this, on Booya's car
http://www.aussiemagna.net/forums/attachment.php?attachmentid=13693&d=1125021467

or you get rid of the restrictive MAFs and run a single MAP sensor.

They'll work quite well if you can do it. Suck it up now and get a full aftermarket ECU.

Given that that car made over 200kw atw NA then probably not, was discussed in length in the thread i posted. From what i understand it ensures all runners get equal air which in turn increases power.


given that jasonVRX made 234kw with his big engine in (and from what i have seen it is single TB) I'd say that yes it's a useless mod.

given that jasonVRX made 234kw with his big engine in (and from what i have seen it is single TB) I'd say that yes it's a useless mod.

But Jason has probabaly one of the/if not the best knowledge to do with a magna engine, and engines in general...

so he know exactly how to make that power.

Also, with the addition of another TB, maybe this power may increase?

i know sweet fa, about engines, but just an idea :)

If a single throttle body can flow more air then an engine requires, then a 2nd throttle body will not change the peak power output, it will alter the engine characteristics, often at the cost of smooth throttle modulation. Now if you where to put 2 smaller throttles on there, you could increase the throttle response and even out the cyclinder filling without effecting the low rpm response negatively. Ultimately lots of money for little gain on a Magna.

if u go a complete stand alone ECU, you can pretty much do whatever you want. You could have 6 individual throttle bodies if you want. I made a carbon fibre intake manifold for a mate with a 1UZ (Toyota 4 litre V8) in his supra, and he had 8 TB's

http://img2.imageshack.us/img2/6749/wateroutletimage00001.jpg (http://img2.imageshack.us/my.php?image=wateroutletimage00001.jpg)

But Jason has probabaly one of the/if not the best knowledge to do with a magna engine, and engines in general...
so he know exactly how to make that power.

Also, with the addition of another TB, maybe this power may increase?

i know sweet fa, about engines, but just an idea :)


which makes my statement all the more true, If there was an increase available then I'm sure he would've done it.

TZABOY - got pics? I love my toyota V8's and I love 8 throttle bodies, and I love carbon fibre - come on..... :)

Here's a better pic

http://img2.imageshack.us/img2/5769/dynofeb090002.jpg (http://img2.imageshack.us/my.php?image=dynofeb090002.jpg)

given that jasonVRX made 234kw with his big engine in (and from what i have seen it is single TB) I'd say that yes it's a useless mod.

My TB is bored out to 71mm though (took me 3 TB's to find one that was thick enough to acheive it)

Personally i reckon dual TB's is abit overkill on a daily drive magna, look at the magnas that are racing with 3.8L engines.... they are still using a single (bored out to 68mm) TB and are achieving around the 230Kw's@wheels.

I think for 99% of people on here, dual TB's on there magnas are a waste when then is other more easily done mods that will yeild better results for the cost BUT that is just my opinion.

which makes my statement all the more true, If there was an increase available then I'm sure he would've done it.

There may well be an power increase on a build like mine but the cost would outway the gain on my magna, PLUS id lose the good drivability that my car currently has.

thanks for the info jase.
i had the spare TB lying around, and want to get the streetfighter manifold, just wondering if it was worth while to atach the spare TB to it. i think ill just settle with the manifold and a tune for the moment

I say do it, but to use all that extra air you'll need lumpy cams, then high comp, then this, then that!

still, i reckon do it cause it would be cool as!

gota wait on what tim says yet. said he will get back to me

gota wait on what tim says yet. said he will get back to me
custom alloy intake manifold with TB's either side. would make getting to the rear plugs a lot easier :facejump:

custom alloy intake manifold with TB's either side. would make getting to the rear plugs a lot easier :facejump:

Just f*ck the whole top plenum off and make a bolt on "barrel" directly to the lower manifold an bolt 2 stock TB's to that. :hmm:

this may sound stupid but does the throttle body on the other side get enough air through it?
considering that the air has longer to travel before reaching the engine?

Just f*ck the whole top plenum off and make a bolt on "barrel" directly to the lower manifold an bolt 2 stock TB's to that. :hmm:
yeah baby!

this may sound stupid but does the throttle body on the other side get enough air through it?
considering that the air has longer to travel before reaching the engine?


thats the reason why, i would run seperate MAF's, and seperate intakes, they would be roughly the same length, and get the same amount of air in.
in the linky thread, Boosted Booya, said that the aim was to get exact same amount of air to all cylinders.
he had the same set up before he went turbo
http://www.aussiemagna.net/forums/attachment.php?attachmentid=13693&d=1125021467

Just f*ck the whole top plenum off and make a bolt on "barrel" directly to the lower manifold an bolt 2 stock TB's to that. :hmm:

May be different in N/A form, but booya had a simliar setup to this, but they guys found that it gave it less torque etc, so they returned to a modified stock design manifold. Ill try and dig some photos up....

May be different in N/A form, but booya had a simliar setup to this, but they guys found that it gave it less torque etc, so they returned to a modified stock design manifold. Ill try and dig some photos up....

I know that.

Eddy wreckers trialled a "Barrel" setup with twin stock TB's, bolted directly on to the lower manifold on there race magna a couple of years ago

As ive said time and time before, I (and the 3.8magna race guys) havnt had any issues getting good power and driveability out of a single TB on a NA V6 magna

http://i42.tinypic.com/2ztm3ag.jpg
http://i44.tinypic.com/24n0hu9.jpg

http://i41.tinypic.com/21509c9.jpg

That manifold is pretty intense! Where does it rest now?

Unsure. Prob best people to speak to would be the guys at Street Torque in Alice, or Benny

;1037822']That manifold is pretty intense! Where does it rest now?

hey tuffy, there is a bloke on ebay selling ITB manifold for a NA 3000Gt. All thats missing is the trumpets but all throttles and linkages included and replaced stock lower half of manifold.

Plenum design is like a black art, while lots of theories are around it just seems that trial and error is the best method for design. WHat ever you do, any change to the stock intake plenum will probably loose repsonse and or power unless running a tunable ecu to modify timing and fuel for different altered load points. At least to get back the loss anyways, another over that is improvement.

hey tuffy, there is a bloke on ebay selling ITB manifold for a NA 3000Gt. All thats missing is the trumpets but all throttles and linkages included and replaced stock lower half of manifold.

Plenum design is like a black art, while lots of theories are around it just seems that trial and error is the best method for design. WHat ever you do, any change to the stock intake plenum will probably loose repsonse and or power unless running a tunable ecu to modify timing and fuel for different altered load points. At least to get back the loss anyways, another over that is improvement.

Nah I'm good just using a stock 3rd gen manifold for when I go FI. that'll work fine!
Any link to said manifold?

no linky, it was on ebayUS if you've got the time.