Thread: Intake manifold options

I feel what I am about to say pertains to this post, and the person I bought it from is now banned, so Jamie, I am wondering if you could share the specs and possibly some expected gains on this manifold you originally made that I have yet to install just for reference for everyone. I apologize if this was previously covered:



I know you said it was one of your first manifolds and that tuning is a must, which will be accomplished, but I have a few questions for you:

1. Must I remove the heater core/lines in order to install this?
2. What else needs to be intalled on the threaded ports aside from the pcv valve? (might be a noob question- I apologize)
@SR20GTi-R

Thank you for your help. I really hope I can get my car up there to you guys to maximize this setup when all is said and done. Good looks!

^I would buy the 45* degree elbow Xcessive sells for that plenum/TB to reduce the radical bend going into the TB. Should help with plenum volume as well. I wouldn't bother with the IACV unless you absolutely have your mind set on wanting it. You can crack the Q45 throttle body to have the car maintain idle. Mine idled perfectly fine with Kelfords with no IACV. Should perform well over the stock IM.

Thanks Bes. I believe I've answered my own question already, but what exactly was done right with this custom mani over what others are expecting with just the plenum? Lengthened runners? Raised V Stacks? I have a 3.75" intake pipe with a 45* bend right at the throttle body, so it should position the intake right where the battery would normally go. I have a nice Vibrant 4" velocity stack/filter to go on the end of that, hoping this is sufficient to maximize the gains from the mani.

Screw the IACV then. How about the heater core and lines? Would really prefer to retain heat in the B14 as it will see some DD duty.

could you tell me how long the stacks are to the top of the bellmouth? (please,please). really want to compare something like this to the excessive n1 runner with spacer set up.

I won't know about the heat to be honest. There are always ways around things. Might have to get a little creative but when there is a will there is a way lol.

I would run the xcessive elbow off the manifold and use a straight section off the TB. No bends just straight flow into the TB unless you get another headlight and run a 45* bend off the straight and another straight section out of the headlight. It has been a while since I saw that manifold. She was a pretty piece for sure. Super long runners

What is the difference with the 45* angle pre and post throttle body? Would rather just roll with what I have since couplers are all I would need to make this happen.

Will finish installing wideband, oil psi, fuel psi, and water temp gauges in the mean time. All wiring is ran just need to install the CS adapters

To be honest, I never really understood the difference. Might just have to do with the smooth entry of air into the TB? Maybe due to added plenum volume or the way the air is transitioned. I would love to try a test with and without the bend.

You should bring it w a head to a flow bench. See difference with and with out it.. the entry to the Plenum is really important to getting equal flow to each cylinder.

I have a feeling the elbow might hurt the flow to cylinder number 4.

No difference between post and pre 45*, so yes, roll with the couplers you have.





The theory the 45* Xcessive elbow adds plenum volume is not quite right. Yes, the engine sees the 45* elbow as the plenum during part throttle and at idle but not during full throttle because there is no major area or volume change. During full throttle it sees the 45* elbow as part of the intake pipe.

Only way to determine this is a flow bench and to actually dyno the parts. Maybe one day I'll give it a shot.