mx5cartalk.com

Hay guys, at the moment I'am looking for 1.8lt Intake plenums for my mx5, it seems tho that not many people don'tmake them. I have a Gruppe carbon intake set-up that has made a big power difference for my NA motor set-up, I'am not wanting too go to ITB's as I'am not a fan off dirt and debris getting into my motor, and I also wat it too be kept road legal. If I could find a good plenum it would really compliment the air intake set-up I have now. I know that http://nozzs.com/index.php?main_page=index&cPath=5_10 have this available for there 1.6 but thats all. Anyone know where too go looking?

What about the one the yanks call a 'square top' Mazda OE JDM one?

I have one here and it has no EGR valve provisions, maybe it also has other differences internally compared to the Aussie one?

Square tops have made over 180rwhp n/a before.

Dann

The squaretops also remove the VICS butterfly system don't they?

Yeah they go to a VTCS system. Two stock manifolds are below if you want to take a look, generally I've only seen people make ITB's and FI manifolds aftermarket. You need to have a pretty serious N/A motor to warrant an upgrade over either though. Steve greens car is making over 115rwkw with the stock manifold for instance. I have heard the top 2F motors have extensively ported standard manifolds though... What is actually done to your car other than the gruppe intake?

http://www.mazdaspeedy.com/2010/03/2001-mx5-18-sport-and-99-vtcs-msm.html
http://www.mazdaspeedy.com/2010/03/2001-mx5-18-sport-and-99-vtcs-msm.html

If your only issue with ITBs is dirt and debris then there's different options to include a range of filters or an airbox to the ITB setup.

i vote the above on an air box for the itbs - or individual air filters. i have read that an increased volume intake manifold can lose power if the engine is not setup for it correctly for it though i am sure some of the more educated forumites on the matter will be able to chime in on it.