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Old 02-24-2015, 01:45 PM   #861
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You guys should watch the video linked to in the for sale ad... 4 wide SM finish at CMS...extra gewd stuff!
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Old 02-24-2015, 01:49 PM   #862
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but mah r/s ratio.
Just go the custom piston route
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Old 02-24-2015, 01:56 PM   #863
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You guys should watch the video linked to in the for sale ad... 4 wide SM finish at CMS...extra gewd stuff!
Damn! That was awesome. Like watching the Blue Angels.
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Old 02-24-2015, 02:54 PM   #864
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Just go the custom piston route
K series pistons are already short as **** for car pistons.
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Old 02-26-2015, 11:29 AM   #865
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the piston length doesnt have to change. Just push the wrist pin up into the oil rings.
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Old 02-26-2015, 01:06 PM   #866
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4 piston racing makes a longer rod setup for the k24. Cost? That I don't know.
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Old 03-02-2015, 11:17 PM   #867
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Got some awesome intake manifold testing to post up when I have time.

Long story short, we tested 4 manifolds, two headers, and managed to pull 17whp more out of the car. It's linked on the FB page right now, but I'll try to get it on MT.net shortly.
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Old 03-04-2015, 02:13 PM   #868
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Nice comparison David. I wonder how much the throttle body accounted for the differences. It would have been great if that variable remained constant. The 74mm to 90mm shows nothing is gained when going larger anyway.

Thanks for sharing!
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Old 03-04-2015, 02:51 PM   #869
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Originally Posted by k24madness View Post
Nice comparison David. I wonder how much the throttle body accounted for the differences. It would have been great if that variable remained constant. The 74mm to 90mm shows nothing is gained when going larger anyway.

Thanks for sharing!
At this power level, I wouldn't expect the TB to be worth more than 1-2whp given that the base is already more than large enough. F/I past 300whp and I think we would see more delta.
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Old 03-04-2015, 07:30 PM   #870
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At this power level, I wouldn't expect the TB to be worth more than 1-2whp given that the base is already more than large enough. F/I past 300whp and I think we would see more delta.
I'll have some data on that soon enough. I swapped my 62mm for 74mm. It will be the only thing I will have changed before the re-tune. I don't think it will make more than 3hp difference but you never know.

Andrew had a 74mm that fit my manifold up for sale. It looked really cool. I could not help myself. If it makes HP I will be thrilled.

Last edited by k24madness; 03-04-2015 at 08:46 PM.
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Old 03-24-2015, 01:05 PM   #871
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...if you are willing to forgo a heater core, the stock TSX intake ("RBB") fits in there nicely. Fabbing a CAI gets a little interesting, but it is at least a decent stop-gap alternative while saving up for a different intake...
I know this is an old post I'm replying to and you've already got your solution, but this is probably a decent solution depending on the K-series heater hose setup. Would it potentially be helpful?

From GoKart's thread on m.net




Link to pictures with heater core and hose modifications:
MX-5 Miata Forum - View Single Post - GoKart's LS2 NB Build Thread







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K series Miata swap-p1010548.jpg   K series Miata swap-p1010547.jpg   K series Miata swap-p1010537.jpg   K series Miata swap-p1010550.jpg   K series Miata swap-p1010551.jpg  

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Old 07-27-2015, 06:33 PM   #872
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<p>To all the Californians out there...&nbsp;</p><p>&nbsp;</p><p>Is it possible to get a 1991 k24 swapped miata BAR approved for legal street driving? It seems like I would have to use all of the honda sensors and emissions equipment and ECU. I'd probably have to swap the complete harness and achieve full OBD2 functionality. The electrical/wiring side will be a headache...</p><p>https://www.bar.ca.gov/Industry/Engi...uidelines.html</p><p>Do you think this swap driven legally in CA is possible?</p>
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Old 07-27-2015, 08:08 PM   #873
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Not an expert on BAR regulations by any means but a couple things come to mind immediately:
-The fuel system on the NA is a return style instead of returnless. Pretty sure a BAR legal swap will require a retrofit of a returnless style fuel system. The NB is returnless so that would probably be a better choice.
-I believe you need BAR legal exhaust/intake manifold if they're not OEM correct? That will be a challenge. Andy Hollis had a setup that worked with OEM parts on both sides (in an NB) but it would be a pretty significant compromise.

I would read some of the swap stuff on K20A.org because they have a lot of experience with BAR legal swaps into older chassis.

Or just move out of California.
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Old 07-27-2015, 08:59 PM   #874
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One thing to consider is that the engine must be newer than the vehicle. So you could (probably) get one legally into a 1990, or maybe 1991.
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Old 07-27-2015, 09:02 PM   #875
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isn't the header usually the biggest problem?
When they say all emissions equipment, they really mean ALL OF IT. like, down to the very last detail. And it cant' be modified in any way.
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Old 07-27-2015, 09:36 PM   #876
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Originally Posted by 18psi View Post
isn't the header usually the biggest problem?
When they say all emissions equipment, they really mean ALL OF IT. like, down to the very last detail. And it cant' be modified in any way.
This. Going through the BAR process is not a joke. The best chance the Miata community has at a BAR approved swap are NBs using the LFX. You can purchase CARB approved LFX crate engines straight from GM IIRC.
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Old 07-27-2015, 09:38 PM   #877
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Well kind of.
There are something's that simply will not work. In those instances, the referee can make exceptions. The best thing to do is go and talk to your referee before you begin the build. Bring him some detail on the areas you know will be a problem. See what he says. If he is a complete hard *** you'll be screwed. But most of those guys are car guys and if they see you are doing everything possible by the book, and this one thing just won't work without mods... They'll give it to you.
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Old 07-27-2015, 09:42 PM   #878
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^ this of course is for individuals doing swaps. Not for company's going for full CARB cert.
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Old 07-27-2015, 09:43 PM   #879
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they really mean ALL OF IT. like, down to the very last detail. And it cant' be modified in any way.
Yup. ALL OF IT always means ALL THE CATS as well.
One of the major sticking points for the BAR approved 5.0 swaps here in .

I mean. California.
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Old 07-27-2015, 09:50 PM   #880
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K swap aint going to happen with carb. exhaust would need to route through the front wheel.
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