Audi 5 single throttle bodies Intake Manifold

[a_CQ]

They are from some Toyota...either Japan or Europe+Japan only...we didn't get them in US. They are 4 cyl. so I had to source 5.

[Error404]

Nice and linear on the power curve
Why did you use the 3B intake manifold before the ITBs?
I would have thought the longer runners on the 7A manifold would be better?

[Micky B]

big loss on torque below 4500. Is it power on the wheels?!
we are going to use a different system on our project.
it is nice to see that someone else try that on a 5 cyl.
we are going to measure it on the same type of dyno so it will be
a good thing to compare.

[GazzaG60]

i think its important to lookm at cams and compression before these.

sure the guys who use them can elaborate but for the 7a standard engine you will be wasting your money.

[a_CQ]

To answer some questions. I used the 3B manifold because, 1/ I had it already as I was originally planning to build a 20vT, and 2/ I figured shorter runners will give me more power and torque up top - this is primarily track car so i don't care about any power or torque below 4,000 rpm. It also allowed me to use much larger throttle body.

Micky B, as I said, no big deal about the loss down low. And yes, this is power to the wheels. I don't really care what it translates to CHP. According to dyno operator, stock 2.7Ts put 175whp consistently, and they estimate the loss on this dyno is about 30%. FWIW.

Glad to see you are going the same way. I would love to see the picture of the head mating surface on that manifold of yours. Am I assuming correctly that the throttle plates are almost at the bottom? I have calculated that for our displacement and revs, ideally you would want the end of whole assembly to be somewhere around 23cm from the intake valve head. You can then play with trumpet lengths for best torque. If your plates are that low you may see way too much turbulence going into the cylinder...perhaps not, but I think so.

Gazza, you are partially right. Cams and valvetrain that can support higher revs would be the next step. I wouldn't say it's waste of money as my 3B intake setup was better than stock and this is even better than that, even though the top HP figure is the same. I can totally tell that car is quicker off the corners and throttle response is incredible. Well worth it IMO, and this didn't cost me anywhere near to what some prices were mentioned above.

[Micky B]

Micky B, as I said, no big deal about the loss down low. And yes, this is power to the wheels. I don't really care what it translates to CHP. According to dyno operator, stock 2.7Ts put 175whp consistently, and they estimate the loss on this dyno is about 30%. FWIW.

Glad to see you are going the same way. I would love to see the picture of the head mating surface on that manifold of yours. Am I assuming correctly that the throttle plates are almost at the bottom? I have calculated that for our displacement and revs, ideally you would want the end of whole assembly to be somewhere around 23cm from the intake valve head. You can then play with trumpet lengths for best torque. If your plates are that low you may see way too much turbulence going into the cylinder...perhaps not, but I think so.

Yes the plates very close to the head aprox 70mm. Ours 245mm from head.
I made a 4 cyl version of this engine(6A), 12,5 compr, big cams, ported head, ind manifold etc, what i learned from it , we made this manifold like that...
power figures attached.
Plates:
It is basicly stops the swirl, which can cause flow loss and poor fuel mixture, at some
higher rpms if it is too high intensity... i belive of my experience

[a_CQ]

Nice.

How is the transition from round to oval in that short distance?

And are they straight up from the head or tilted down? Have you fitted it in the car? You may have issues closing the hood.

[AustenW]

Nice

[Robmarriott]

big loss on torque below 4500. Is it power on the wheels?!
we are going to use a different system on our project.
it is nice to see that someone else try that on a 5 cyl.
we are going to measure it on the same type of dyno so it will be
a good thing to compare.

AT power setup, good choice.

We saw a gain of around 10bhp on a Clio 172 over Jenvey throttles just by swapping to this setup.

[Sparxx]

I´m looking for an IM for a 7A engine like that:

http://i110.photobucket.com/albums/n89/ubodepaode/Audi/DSC04908.jpg

or the IM on the flow-improver ensemble.

Any ideas?

[a_CQ]

I had that custom made. I can put you in touch with a guy who can do it.

[Sparxx]

thanks dude, but custom is not that what I prefer in that part. Actually I´m looking for a cast one. Your IM is really nice and if there is nothing else I´ll call you.

[a_CQ]

Well, I doubt anybody is going to have cast units available anywhere. I would be willing to sell mine for what I have into it(~$750) if you want to use it to produce cast units, but it would have to be in the off-season. My track season starts in about 2-3 weeks...

[Sparxx]

hmm, we can grind some flanges and welding some tubes on, but .......
The IM by flow improver is definitive not made by himself. That is manufactured by a company. And I need that info.
No, I don´t ask him twice, you know ...........

[Sparxx]

oh, I forgot, I only need one IM for a friend of mine. And thanks for your offer ....


He needs to run on carburetors ............ that´s not my choice.