Help me with my custom intake manifold order please

[Eikon]

Hey guys...

I've posted a couple times about working with a company called Boost Flow Technologies on making a custom RB20 intake manifold.

They just finished a couple Supra manifolds and are about to complete a RB26dett manifold. So they are almost ready to start working on mine.

Ross asked me yesterday what options I wanted on it... in other words, what ports, accessories, etc...

So, can you guys help me figure out what I need to make a quality swap.

First off.. I will need to install the AAC with the vaccuum tube... the old vaccuum tube went from the intake tube previous to the throttle body... do I need to make a port on the new FMIC tubing just previous to the throttle body now as well?

Second... The cooling tubes going from the radiator to the head are of course necessary.

Third... I was thinking of doing a single vacuum port off the manifold and going with an American Eagle Vacuum manifold to run accessories like fuel pressure regulator, etc...

Fourth... What throttle body would be best? I have a Q45 90mm that I can use... But I've had discussions with people saying that the stock RB20 throttle body is more than sufficient for up to 400hp or more, and will get me a little better throttle response. What do you guys think? Carl, Nick?

What else do I need to have included on this manifold????

You guys who have done custom manifolds or bought from RIPS, etc... What ports and accessories are included and necessary on yours?

I am so excited... they are doing custom tubing from turbo to FMIC, installing my FMIC, tubing from FMIC to intake, custom intake, etc... Also, they are doing a downpipe/straightpipe from the turbo to my exhaust.

I just need to tell them exactly what I want done with mine.

Thanks!

[goofynick6]

Don't do the Q45, it will suck on tha little engine.

My buddy personally made 632 whp on his built SR using stock 60mm throttlebody (identical to RB20).

As far as options, you need the idle air controller mounted directly to it for it to operate properly. I'm going to making a couple more intakes like mine, I'll post pics.

Nick

[Eikon]

Don't do the Q45, it will suck on tha little engine.

My buddy personally made 632 whp on his built SR using stock 60mm throttlebody (identical to RB20).

As far as options, you need the idle air controller mounted directly to it for it to operate properly. I'm going to making a couple more intakes like mine, I'll post pics.

Nick

I'll trust your expertise on this one Nick... I will stick with the stock throttle body... But, I have a couple follow-up questions for you.

My FMIC has a 3" outlet. Do I shrink that immediately and run 2.5 from FMIC to throttle body? Or do I stick to 3" and shrink it at the TB?

I was planning on having them mount the AAC directly to the bottom side of the intake so it's invisible.. I just have to make sure the idle adjust screw is still accesable. Am I correct that the air tube that feeds the AAC needs to be relocated to the intake piping just prior to the TB? That's how it is currently.

What else am I missing guys? Is the AAC and a single vacuum port going to a vacuum manifold going to be enough?

Here's a link to the vacuum manifold... http://shopping.lightningmotor....html

Will I need to get a new intake manifold gasket? Or have people been able to reuse the existing?

I just want to make sure that when we do the swap I don't find out that we forgot something important...

Thanks

[goofynick6]

I'll trust your expertise on this one Nick... I will stick with the stock throttle body... But, I have a couple follow-up questions for you.

My FMIC has a 3" outlet. Do I shrink that immediately and run 2.5 from FMIC to throttle body? Or do I stick to 3" and shrink it at the TB?

I was planning on having them mount the AAC directly to the bottom side of the intake so it's invisible.. I just have to make sure the idle adjust screw is still accesable. Am I correct that the air tube that feeds the AAC needs to be relocated to the intake piping just prior to the TB? That's how it is currently.

What else am I missing guys? Is the AAC and a single vacuum port going to a vacuum manifold going to be enough?

Here's a link to the vacuum manifold... http://shopping.lightningmotor....html

Will I need to get a new intake manifold gasket? Or have people been able to reuse the existing?

I just want to make sure that when we do the swap I don't find out that we forgot something important...

Thanks

My fmic is 3" in and out, it goes to 2.75" after the fmic, but 2.5" will suffice as well. The throttlebody is plenty, and upgrade to 65mm wouldn't hurt, but not worth the extra expense/hassle of wiring in 2 sensors on a custom tb.

The main line for the AAC comes from a spot pre-tb like you said, and it also feeds that other idle thing located under the fuel rail with the purple plug, and a vac line to the fuel dampener on the end of the rail. For vac ports, you can use that vac manifold thing, but I just tapped in some brass fittings into the side of the manifold I made (1 for brake booster, 1 for wastegate, 1 that runs fpr and bov, and 1 coming from the other side of that idle thing with the purple plug under the fuel rail). I'll upload some good pics tonight when I get home.

The stock gasket will fall apart, you can try to find a new one, or really clean the surfaces up with a wire-brush wheel on a drill and use a nice thin thin layer of blue rtv gasket maker around all ports and bolt holes and let sit for 24 hours (what I did).

Nick

[Carl H]

on my rips manifold i have 4 vac ports and one large one for the brake booster.i would have him set the throttle body plate up for a overbore tb so that if you do decide to slap a larger tb on it it will be a bolt on affair.as for intercooler piping i would try to keep the entire system under 2.5" diamater pipe as you go larger piping you are adding more displacement to fill up which will cause throttle lag.

[Eikon]

So it sounds like I should have them install:

a. The AAC on the manifold and a vacuum port on the intake tubing. b. A larger vacuum port for the brake boosterc. A smaller vacuum port that runs to my vacuum manifold. From there I can run as many small tubes as I want (FPR, BOV, wastegate, others)d. A TB plate that is large enough to accept a 90MM TB and the stock RB20 TB.

I am curious to see how they will run the coolant lines from the radiator to the head. I am sure that might get tricky.

As for the IC piping... You think that 2.5" is sufficient from the turbo to the 3" opening in the IC? Then exits the IC at 2.75" and the tubing is 2.5" again to the TB? Is that the right way to do it?

I know that the stock turbo is going to suck and filling all that space... But my plan is to go with a t3/to4e turbo (I want to be just like Nick). I just can't afford to do it now... but I want to prepare for that time in the future.

I can't wait to get a new downpipe/straightpipe combo done. Man that is going to free up some power. You guys should see the downpipe that's on my car... looks like a straw.

[goofynick6]

I don't think you can make it take a 60 and 90mm tb, but listen..you will NEVER need a 90mm tb, that is rediculously large, even for the q45 it came on. You can make 1000hp on a 75mm tb.

You want a large vac port going to the vac manifold thing, because it needs a large supply line to feed all the small lines coming out of it.

Nick

[goofynick6]

Here's a couple quick pics of mine

[goofynick6]

Another

[rb250sx]

nick thats awesome. looks a lot better than a cut up road sign JB welded together:)..not that anyone would ever do that haha.

just curious, how are you mounting your throtle cable?

[Eikon]

Thanks for the pictures Nick. That is really nice looking!

Did you rig up an oil catch can? Where does the large tube from the intake valve cover head to?

[goofynick6]

I have a very simple bracket for the throttle cable that bolts to the intake where the 2 small ground wires bolt to it near the front.

I also have a catch can that is barely visible in the back left corner which the large hose runs to (would like to re-route it for better looks).

Nick

[Slo_240sx]

I haven't gotten to making a custom ITM yet let alone got the car on the road... But I know for your I/C piping you can just get a 3" to 2.5" reducer and that will be sufficient enough. 3" I/c piping will be way too big to fill and create mad turbo lag.-Alex