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K series Miata swap

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Old Jul 4, 2014 | 09:05 AM
  #581  
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The exhaust switches sides behind the oil pan in front of the transmission.

In my opinion if people can't figure out fuel and coolant lines than they shouldn't be swapping engines as that's the easiest stuff
Old Jul 4, 2014 | 10:32 AM
  #582  
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Originally Posted by thirdgen
How does the header connect to stock Miata exhaust if the exhaust side of a K series engine is on the passengers side, and the Miata exhaust is on the drivers side?
The J-pipe shown in the picture runs under the oil pan and over to the stock exhaust location.

Old Jul 4, 2014 | 10:42 AM
  #583  
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That's pretty wild. I'm still on the fence as far as pulling the plug on this swap.
Old Jul 6, 2014 | 08:04 AM
  #584  
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Have you had any issues with oil temperature, with the exhaust being routed under the oil pan?

Once the car is sorted out, you'll get a call from me for sure...

Great job

Ben
Old Jul 6, 2014 | 08:26 AM
  #585  
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Originally Posted by Midtenn
The J-pipe shown in the picture runs under the oil pan and over to the stock exhaust location.
Why not under the gearbox? Thats how I did it, even managed to fit all of the stock bracing over the crossover without modification or spacers.

Dann
Old Jul 6, 2014 | 11:31 AM
  #586  
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Originally Posted by bigben
Have you had any issues with oil temperature, with the exhaust being routed under the oil pan?

Once the car is sorted out, you'll get a call from me for sure...

Great job

Ben
Call us any time, this setup has been sorted out for months. I wouldn't sell them if it wasn't.

No oil temp issues, lots of cars run headers under oil pans, including all B, D, and H series powered Hondas.
Old Jul 6, 2014 | 11:33 AM
  #587  
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Originally Posted by nitrodann
Why not under the gearbox? Thats how I did it, even managed to fit all of the stock bracing over the crossover without modification or spacers.

Dann
It could be done, but we wanted max ground clearance and are running 3" exhaust. The gap between the pan and trans have us more clearance than going under the trans.

What motor you running, with what size exhaust?
Old Jul 6, 2014 | 11:37 AM
  #588  
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Originally Posted by K Miata
Call us any time, this setup has been sorted out for months. I wouldn't sell them if it wasn't. No oil temp issues, lots of cars run headers under oil pans, including all B, D, and H series powered Hondas.
Thats true... My Honda days are far behind... Lol Thanks for the reply!
Old Jul 6, 2014 | 12:03 PM
  #589  
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Do you guys have any idea if a rotrex will fit around the subframe/ mount area. (kraftwerks race kit) ? I can't decide what route i want to go with my setup (rotrex vs turbo). I have a lead on a engine, but I'm waiting for a reply to go look at it.
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Old Jul 6, 2014 | 02:44 PM
  #590  
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Originally Posted by ctdrftna
Do you guys have any idea if a rotrex will fit around the subframe/ mount area. (kraftwerks race kit) ? I can't decide what route i want to go with my setup (rotrex vs turbo).
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Old Jul 6, 2014 | 10:46 PM
  #591  
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I just scored a k24a4 (160hp/161tq, 9.7:1 compression). I could change pistons, head swap, intake, and make maybe 240whp in my Miata N/A with that motor...or I could just continue to run my BP w/ 2560 turbo.
So right now, my car gets about 29 mpg driven to work, and it should run low 13's in the 1/4 with that turbo...I'm also guessing it should put down something like 250whp/220wtq?
How would the k series Honda swap compare to what I have now? I'm all about a cleaner engine bay, and N/A power...but the lack of torque has me stumped as to how it would feel to drive it.
Old Jul 7, 2014 | 05:22 AM
  #592  
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Your only gonna be around 180 ftlbs with the NA, but you will be loosing weight, and running cooler under the hood. If you have e85 in your area you can boost your power a bit with higher compression (13.0:1 +). I have no experience with how the power feels, but my friend is making 366whp with a k24 on methanol and he says it feels like a turbo car lol
Old Jul 7, 2014 | 06:20 AM
  #593  
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We used a 2.5" but the section that goes under the car and crosses over is a flattened 3" with the same cross sectional area of 2.5" which could easily be achieved with a 3.5" pipe flattened for a 3" system.

Dann
Old Jul 7, 2014 | 06:45 PM
  #594  
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Originally Posted by nitrodann
We used a 2.5" but the section that goes under the car and crosses over is a flattened 3" with the same cross sectional area of 2.5" which could easily be achieved with a 3.5" pipe flattened for a 3" system.

Dann
Or you can run it under the oil pan, which is how OEMs do it.
Old Jul 7, 2014 | 11:28 PM
  #595  
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Originally Posted by Savington
Or you can run it under the oil pan, which is how OEMs do it.
Yup. More than one way to do it, and customers certainly can build their own exhaust any way they want.

I like our solution. Works great, and the real clearance issue is where to put the collector. Since you have to already be at either 2.5" or 3" before you actually come off the side of the motor, its nice to duck it under the pan right away so customers can use the OEM exhaust routing.
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Old Jul 7, 2014 | 11:29 PM
  #596  
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Originally Posted by ctdrftna
Do you guys have any idea if a rotrex will fit around the subframe/ mount area. (kraftwerks race kit) ? I can't decide what route i want to go with my setup (rotrex vs turbo). I have a lead on a engine, but I'm waiting for a reply to go look at it.
I think I emailed you back on this already... short answer is we don't know, but I do know that the K series A/C compressor does not quite fit. We need a test unit from Kraftwerks
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Old Jul 8, 2014 | 01:32 AM
  #597  
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header looks amazing!
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Old Jul 8, 2014 | 05:10 AM
  #598  
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Originally Posted by K Miata
I think I emailed you back on this already... short answer is we don't know, but I do know that the K series A/C compressor does not quite fit. We need a test unit from Kraftwerks
Yup you got back to me, Im not looking to reinvent the wheel to fit a supercharger, turbo it will be. This project is going to snowball as my projects usually do (tube front end car).

Im not sure of what turbo will suit what i want to do though 10-12 psi on 93 pump 375-400whp area. This car is a street car so im praying that 205 tires will save my transmission and burn up instead of breaking ****.

Anyone have recommendations for turbos ?

EFR 7163 + .85 a/r v band housing (twin scroll internal gate ? )
i worry about the gate being to small on these turbos to run low boost

GTX 3071R + .86 a/r Tial housing


most people on k series forums are running bigger stuff like gtx3582 , 6262, big efr's. I feel that these are to big as i want really good spool up and low end and reach the power i want.
Old Jul 8, 2014 | 08:26 AM
  #599  
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Originally Posted by ctdrftna
93 pump 375-400whp area....(tube front) street car ...205 tires....i want really good spool up and low end and reach the power i want.
Maybe I'm out of touch with current turbo technology, but I feel like you're trolling or something here....
Old Jul 8, 2014 | 10:01 AM
  #600  
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Soviet's EFR hits 29psi somewhere around 4000rpm and made 458whp, not trolling in the least.



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