Project V8 RX-7: Part 12 - The Intake & Finishing Touches

by Jeff Naeyaert

Welp, the last day of Project V8 RX-7 Week is upon us!  If you’re a rotary zealot or Vh8er and we’ve been pissing you off all week your suffering is almost over!  (For a little while at least.)  

We saved building our intake 'til the end because we were waiting on our KRC power steering pump, which may have obstructed the intended placement of our filter—directly in front of the driver’s side head like we had on our LS1 setup before.  We didn’t have power steering then, so it wasn’t a problem. 

Our intake setup from the ol' LS1 days (you can tell it's old cuz of the sepia tone) with the filter right where our KRC power steering pump lives now.

Now all of a sudden we’re left with little where else to go—maybe bent off to the right side?  Complicating things our E-ROD installation instructions stipulate 2 requirements that must be met for proper engine performance and more importantly, CARB certification.  They are 1) the induction system where the MAF is mounted should be 4 inches in diameter and have a minimum straight section 6 inches in length; and 2) ensure that the mounting boss (for the MAF) is at least 10 inches from the throttle body. 

Apart from that, the instructions would suggest that the intake is pretty much open to be built however you choose!  That’s great, because now we don’t have someone else telling us how our intake HAS TO be—which would be the case if the E-ROD kit came supplied with an intake.

The E-ROD kit comes with a dry element filter, the mounting boss for the MAF and the MAF sensor—that’s it. 

The instructions say that it is recommended the provided filter be used, but if an alternate filter must be used (presumably because the provided filter is too big) it must be of the dry element variety.  That reads like it’s OK to use a different one, which is good for us!  However, this sorta gray area is where you are most likely going to run into kickback from a CARB referee because they just don’t like gray.  The referee wants a definitive description of what he’s supposed to look for and subsequently find when he does his inspection—nothing should be subjective.  But we’re getting ahead of ourselves.  We’ll get to the smog stuff in great detail in a later installment.


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Dusty Duster
Dusty Dusterlink
Friday, June 01, 2012 4:14 AM
I can't believe the sheer amount of stupidity you have to put up with in California for emissions. VERY glad to see this project running under its own power though!
Friday, June 01, 2012 4:46 AM
Perfect way to start the summer!
Friday, June 01, 2012 6:47 AM
Yes Dusty...you can't do anything here...
Friday, June 01, 2012 7:56 AM
That sounds sooooo wrong...and yet it IS sooooo right! Probably my favorite part of this whole project has been the attention to detail for emissions. I know you guys had to dot the Is and cross the Ts to get a sticker, but so many project seem to give the bird to our environment. It's very nice seeing a project car that's not only fast, but somewhat green.

So, when are the KWs going under this one? that's like a requirement for a MotoIQ project these days, right?
Friday, June 01, 2012 12:09 PM
You hit the track and didn't give us the times?!
Jeff Naeyaert
Jeff Naeyaertlink
Friday, June 01, 2012 3:14 PM
All the numbers and excuses are in the description on the YouTube page. You should be watching it in 1080p over there anyway! :)
Tarik Laaraj
Tarik Laarajlink
Friday, June 01, 2012 4:30 PM
What was the final cost of the car?
Jeff Naeyaert
Jeff Naeyaertlink
Friday, June 01, 2012 5:33 PM
Friday, June 01, 2012 8:20 PM
SOLID!! sounds nice, got to get a clip of that bad boy idling and throw a few revs at it
Saturday, June 02, 2012 12:25 AM
The exhaust sounds throaty but not annoying. I think it's pretty quiet to tell you the truth.
Jeff Naeyaert
Jeff Naeyaertlink
Saturday, June 02, 2012 12:29 AM
yeah the cats absorb a lot of that annoying i think.. sounds pretty normal at idle--quieter than most pickups and camEros in my hood. I've got some clips of it idling maybe i'll stick up.
Saturday, June 02, 2012 4:15 AM
I just saw the time-lapse video of the build. Very cool to watch as well!
Saturday, June 02, 2012 7:45 PM
Live every week, like its Project V8 RX-7 week.
Wednesday, June 06, 2012 11:45 AM
Needs an x-pipe so it'll sound like this:


So gangster. :)

Great to see this sucker finally done. Hurry up and smog it so you can ditch the "front mount intake" (those of us who witnessed the horrors of the late 90s import scene should be familiar with this).
Jeff Naeyaert
Jeff Naeyaertlink
Wednesday, June 06, 2012 11:52 AM
hmmm, think i might need some valve springs too ;)
Wednesday, June 06, 2012 12:44 PM
Don't worry about it. Pushrods are meant for revving!
Wednesday, June 06, 2012 12:47 PM
BTW, Mike says he was revving to 7k there. How high can you rev these motors on stock springs anyway?
Jeff Naeyaert
Jeff Naeyaertlink
Wednesday, June 06, 2012 1:26 PM
probably wouldn't wanna go much more than the limiter at 6,600... but 7k is definitely doable--gotta do a cam to find power up there anyway, so while you're in there!!!
Sunday, June 10, 2012 8:55 PM
Hell yes, i have really enjoyed the updates! You just wanted to put Mike and Eric's T/A posts to shame.... lol.

Rockwood, you said exactly what i was thinking - a BA car rockin an Interfooler - not a very flattering reference.
Friday, June 15, 2012 4:59 PM
Why do you need to go to a CARB Ref? I thought the kit came with an EO sticker so you could just get it smogged after installing it without going to a ref? On the EO it says the kit comes with an "Emissions Certification Label"


What am I missing?
Jeff Naeyaert
Jeff Naeyaertlink
Friday, June 15, 2012 5:42 PM
because when i called CARB to see if I could just go to a regular smog shop they said no, have to go to a referee for any engine change--even with the sticker.. everything is answered in the next article coming up though!
Friday, June 15, 2012 5:55 PM
Well, that sucks. Good luck (unless you've already done it) hopefully it's pretty easy. I registered a kit car under SB100 and that was easy, but meeting 2010 emissions instead of 1965 emissions will be a bit more difficult.
Monday, November 19, 2012 12:23 AM
did i miss the next article? what was the BAR verdict?
Tarik Laaraj
Tarik Laarajlink
Tuesday, December 11, 2012 11:23 AM
When it rains how will you get around the filter getting soaked?
Jeff Naeyaert
Jeff Naeyaertlink
Monday, July 01, 2013 11:47 AM
I drive Project Golf TDI when it rains :)
Friday, November 22, 2013 4:59 PM
Love this article as I am right now starting a Rx7 V8 conversion, thanks. A lot of little parts for me to look at and incorporate.
Thursday, November 20, 2014 10:07 AM
Isn't that an oiled K&N filter? Most are, though it appears k&n is selling aem dryflow filters with some of their kits now. To keep that maf from getting gummed up you are going to need a true dry filter. Bonus, the aem ones filter better too.
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