Also check out CJ MotorSports manifold thread and AT Power DBW TB

If you have the drafting and flow dynamic modeling software, a CNC machine and a flowbench, all you need are the dimensions of the OEM manifold as a starting point and you can try several iterations until you see good improvements.

I think the real bottlenecks will be the exhaust cam -- which is not variable -- and the exhaust manifold. You might be able to work around the exhaust cam, but I suspect the IM will only be really worthwhile for folks with headers.

Assuming you can work around those issues, the last major hurdles will be space and cost. Fitting different runners under the hood without other modifications ( e.g., different strut brace) will be tricky.

Bigger diameter runners should give more overall torque, You might play with stepped diameters too. I believe shorter runners will net a peak torque at a lower RPM, while longer runners will make peak torque higher up.

Last major obstacle is cost -- it would be nice if these could be mass produced for not much more than a grand, and less would be ideal. so sacrificing some shiny/pretty for power seems like a worthwhile trade.

I think the fundamental problem with building an IM for the Z has been the approach; I think all other IM attempts have been based on adapting an existing IM from other applications rather than experiment with developing a totally new unit using a design where the OEM 370Z IM is the starting point so you have a clear benchmark to work with.

If you have the materials, the tools, and the knowledge to develop something like this, go for it :tup:

The goal is to decrease turns throughout from intake all the way through the lower while maintaining stock location for fuel rails and strut bar. Moving TBs to the front may be an option as that will be the least restrictive for airflow (bend wise). But Like i said, working on access to a flow bench through some family friends.


This was dumbfounding to me when I started my search, I came from owning a hyundai and we had 3-4 fully custom manifold options in the 600-900 price range.

look at AMS and their GTR manifold. it's somewhat like the OEM and based off the design but looks much better than stock.

or their new omega CF intake manifold is just pornography for car people.

seen at the beginning of this video below. if we could get something like that i would pay the money for it lol

pause video at the 28 second mark or so.

Just look up 1slow370 world record Na Build, model after his car like I plan on doing, He has cams stock block etc.... made 371 to the wheels on e-85

he has a one off manifold from GTM.

a. no more will be made from GTM i'll assume lol
b. he probably paid 1500 or more for it.

The real reason this will probably the only one GTM will ever make is because almost nobody would be willing to give them that kind of money with all the horror stories others have had regarding their business practices.

While $1500 is more than many people would be willing to spend, there is most certainly a market for a high performance mani at that price point assuming it provides considerable gains. Given that ~340whp is about the max most NA people with full boltons have got, being able to get up to the 360-370whp range is worth the extra coin.

Honestly, I don't care what it looks like so long as the gains are great. Having a shiny piece under the hood is pointless for many unless the performance gains are there.

still there is the major problem. no one has pulled big or even good gains from any manifold. Z1 got a few HP here and there but nothing worth paying that kind of money for.

i'm right there with you. if theres a considerable gain then yea i got no problem handing over the money.

just need to make something that produces power. who cares if its eye candy or not.

:yum:

Or adapt the Jenvey ITB like Sasha Anis did with the ex-Fontana Racing 350Z when he upgraded to VQ37 internals and JWT Grand Am cam package

410+hp atw is close to 500@ the crank

BTW, look what I found in the back of my ute !!!

The AMS GTR Manifold is not just somewhat like the OEM manifold... it IS the OEM manifold. They cut out some of the runner length and weld in a new floor lower down spaced further from the original plenum lids, creating shorter runners and larger plenums... which is pretty much exactly what you would want for that car. This is why there is a $1200 core charge on top of the $3200 price. This of course makes a lot more sense for a GT-R owner who stands to pick up tons of power. But a NA Z isnt going to get much HP per dollar from an intake manifold without increasing the revs. *Maybe* 10hp if you hit a home run. How much is 5-10hp worth to most NA Z owners?

I honestly believe that most the community here want one for appearance more than anything. The stock one is just so hideous. There are very minimal HP gains to be found in an intake manifold for an all-motor 370z that is going to be running stock oil pump / redline IMHO. That is why nobody has really put the effort in yet... the payoff will be pretty slim.

If HP is what you are looking for... unless you are going to make some serious changes to the engine, I think the intake manifold is the wrong place to be looking.

I hate you!

:yum: :yum: :yum:

i think someone here for $295 is a great deal then!

sounds like lower the cost would be worth it then?

sooooooooooooooo maybe with some boost it'll be worth it :stirthepot:

also stop posting and go get you manifold done. i'm tired of fapping to your cad pics. i want some real stuff soon :yum:

:tup:

hmmmm i wonder who that person would be lol

idk which direction i'm going currently. but its snowing, the Z is sleeping, so the mod bug is hitting.