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KMiata SCCA Solo XP swap

aMaff

High Speed Low Drag
Moderator
:
1992 Miata / 2003 Pathfinder
Picked up the Nine Lives Racing Big Wang this morning. Still waiting on the 2nd elements to come back in stock, but once they do that'll go on as well :D



 
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aMaff

High Speed Low Drag
Moderator
:
1992 Miata / 2003 Pathfinder
Finally starting to move in the right direction of putting stuff ONTO the motor vs taking stuff off. Water pump housing and oil pan are on.

 
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chiefmg

MOTM July 2015
:
'81 RX-7 GS, '00 Miata SE, '16 Camaro (wife's), '15 CX-5 GT AWD
What is the purpose of the drain plug on the high side of the oil pan? Loving everything so far.
 

aMaff

High Speed Low Drag
Moderator
:
1992 Miata / 2003 Pathfinder
Sort of like a diff or trans fill where the top plug is essentially the 'high water mark'. With the aftermarket pan, the stock dipstick doesn't really mean much anymore, so that's the 'full' mark.
 

aMaff

High Speed Low Drag
Moderator
:
1992 Miata / 2003 Pathfinder
Back to the engine: got the oiling & timing system buttoned up for the time being. It looks pretty scabby on the outside (despite my best efforts to clean it...this engine needs a hot tank BADLY), but it's clean of oil and grease, and all the important bits were cleaned up and installed with new seals and O-rings where needed (VTC actuator, VTEC solenoid, the 'blanking' (?) plate on the intake side, Crank sensor, etc). The VTEC gasket was absolutely boogered, for example.







On to the shiny cooling parts next.
 

aMaff

High Speed Low Drag
Moderator
:
1992 Miata / 2003 Pathfinder
Finished the Wang install. Trimmed the trunk and got everything bolted back together. About all I need to do is grab some touch-up paint and clean up the bits I hat to cut to clear the uprights.

I gave this no chance of actually working while cutting, but pulling the straps tight kept the trunk nice and rigid:




To fully open the trunk, 2 bolts have to come out, but I was pretty sure that'd be the case before I started on this:




Boom:

 
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aMaff

High Speed Low Drag
Moderator
:
1992 Miata / 2003 Pathfinder
Took the mandatory park-bench shot:



Then did some very important race car arts & crafts:

 

aMaff

High Speed Low Drag
Moderator
:
1992 Miata / 2003 Pathfinder
With an incredible Chasing the Dragon Hillclimb in the books: It begins.



 

aMaff

High Speed Low Drag
Moderator
:
1992 Miata / 2003 Pathfinder
Project "Bolt-on bumper bar" is underway
I figure the engine will likely be in and out a bunch with the upcoming project, so I might as well make it easier on myself and be able to pull the engine and trans straight out the front as a package.
I cut as much of the upper rad 'support' as I could get away with, without affecting the hood pins and bumper-cover supports (the dzus brackets), and will be making the crash bar a bolt-on piece.
There's so much room for activities!

 

aMaff

High Speed Low Drag
Moderator
:
1992 Miata / 2003 Pathfinder
Engine's out:



And the new subframe in. I had to pat my head and rub my tummy and figure out which order the bolts wanted to go in so that all the holes lined up (thanks V8R!!! :diaf:) but once I figured out which hole was the furthest out and started there, it all bolted in.



Next I get to figure out if any of the control arms will bolt up...
 

aMaff

High Speed Low Drag
Moderator
:
1992 Miata / 2003 Pathfinder
I got the ends of the frame rails where I cut out the bumper bar boxed back in, for both strength and safety working around that area.

MIG welding thin, old sheet metal with .030 wire is a pain in the ass but I made it work. I need to get a bigger piece of copper to use as a heat sink for stuff like this, but the little Harbor Freight copper spoon did the job.





And of course, a little "grinder and paint make me the welder I ain't" to complete the look.



I wanted to finish the bumper-bar part today as well (boxing in the ends, and welding the 'ears' to the bar), but I broke the bandsaw blade (it just never ends...) so I'll mess around with those tomorrow.
 

aMaff

High Speed Low Drag
Moderator
:
1992 Miata / 2003 Pathfinder
Finished off the bumper bar side of things today. Welded the ends, then welded the 'paddles' to the bar.

I'm pretty proud of this one. Turns out, getting welding practice makes your welding better.




All welded up, with a couple coats of paint.



On to the next. Probably going to finish up the steering linkage next, then start working on the fuel system.
 

aMaff

High Speed Low Drag
Moderator
:
1992 Miata / 2003 Pathfinder
Been chipping away at a bunch of small stuff, but pieces are starting to fall into place.

Apparently they now have a 'universal' upper coolant housing that doesn't need to use the Miata's stock temp sensor, but I didn't know that, and I've already got this one (and a Miata coolant sensor...) so why not use it. I plan on using the Honda cooling sensor, so I just needed something to plug the hole. I chucked the temp sensor into the late to knock the connector off, and learned that the whole thing is basically 2 pieces. The brass "housing", and then the connector / sensor assembly. As soon as the parting tool touched the join between the 2, the sensor broke free and could be pulled out. I cleaned the end up a little to make it a little more low-profile:




Next started work on putting together the intake manifold. The gasket is...whatever the opposite of port-matched is. There was a really significant (1/8" or so) step, all around the notch for the injectors. The rest of the port wasn't great either, but that bit around the injectors was awful. Kinda hard to see in the pictures, but I opened it all the way up and smoothed the transition between the gasket and port.




Still looks pretty rough in the "after" picture, but I took it apart and deburred and smoothed everything out off the head.




I've ordered the rest of the fuel system components today and some tubing for an intake.

I say that... there's absolutely going to be something I missed or some angle fitting I wasn't expecting to need, but it'll get me most of the way there.
 

aMaff

High Speed Low Drag
Moderator
:
1992 Miata / 2003 Pathfinder
The engine's basically ready to come off the stand so I can notch the bellhousing for the starter. Other than that, it's ready to go.



Now to start with fueling.

So...that's gross. It's not a rats nest (despite looking like it). Other than the leaves there's no other sign of life in there. Kinda wonder if it's the result of some "there's a surprising amount of grip in the grass..." lines during the last couple hill climbs :lol:

 
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aMaff

High Speed Low Drag
Moderator
:
1992 Miata / 2003 Pathfinder
As is usual with non-standard builds using non-standard parts, it's a matter of working through 1 small problem after another. The KMiata swap is likely no problem if you use all stock Honda parts, but throwing oddball stuff into the mix tends to have knock on effects.

Case in point: Water pump and alternator belt tensioning. They do not use a tensioner pulley, but they add an idler pulley, and you shim the alternator with a washer or 2 on the bolts to tension the belt. Using a stock crank pulley, they send a belt that's the correct length for that to work fine.

An ATI SuperDamper, however, is a smaller diameter than stock, so that belt won't work.



I reached out to KMiata and it turns out they run that pulley on one of their race cars, and have a smaller belt recommendation (a 6PK1035. Apparently they don't make 7 rib belts short enough so you've got to run a 6-rib).
After getting that belt in, it was a lot better but the provided washers weren't enough to tension the belt.



So I went and got a few more M8 washers. I ended putting 3 washers under each bolt, then attaching the idler pulley. Even with that it was still a little looser than I like, so I cut a notch into another washer so it's a C-shape, and used a pry-bar to space the alternator out enough that I could put that 4th washer over the top bolt. MUCH better.




On to the fueling mods next.
 

aMaff

High Speed Low Drag
Moderator
:
1992 Miata / 2003 Pathfinder
I finished up the mount for the RacePak. Added a gusset and welded it out. For whatever reason it looks crooked when sitting in the seat, but I checked it with an angle gauge and the cowl of the car, the dash bar of the roll cage and the top surface of the dash mount are all within a degree of each other. so maybe it's my dumb face that's crooked.







Hopefully the only other welding I'll need to do will be to add a mount for a central-ish (hell that might end up off center too...) rear view mirror, Prod-car style for track use once I get the 2nd element of the wing in next week. Something along these lines:

 

aMaff

High Speed Low Drag
Moderator
:
1992 Miata / 2003 Pathfinder
This is a Walbro 450 that's going in. This The only thing I think I want to do different at this point is add another worm clamp to make sure it stays put, and extend the return tube with some rubber line.

I'm swapping to an NB sender because the ends above the tank are SAE quick connects and much MUCH easier to adapt to AN.
There was some question if the NB sender would fit in the NA tank. I have a feeling the issue is the extra width from the stock NB fuel pressure regulator that would sit on the opposite side of the pump, adding a lot of width to the 'column' that's fed in, because once all that's removed it slid right in.

I also needed to shorten the feed hard-line from the pump to fit the taller Walbro, and cut off the fitting for the return line to the pressure reg.





 
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