Miata swap header
07-18-2018, 06:56 AM
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Miata swap header
And here is the swap as it sits, waiting for an exhaust manifold and some wiring time
alrighty then. As the swap has been slow going, but without hiccups until this point, I have yet to post anything, hoping to do a build thread in one go. However one big roadblock has come up. That being the exhaust. This being my first swap, I put the engine where it wanted to be, and added everything around it. Come to see the header will not clear the subframe. I will post pictures later today, but long header short, I butchered my exhaust manifold. Where the original runners meet in 2to1s has been replaced with a 4-1. The runners where heated and slightly bent to meet here better, and do meet up nicely, however the entire manifold is for sure shorter. As I will be running open exhaust and bypassing the downstream with a resister, what are some real potential issues with this approach? I have only an intake, and Ecu is stock.
Here is the beginning of material being removed for fitment, will post the finished product soon.
07-18-2018, 08:01 AM
#2
Um, what?
Your poorly worded title had me scratching my head. You are swapping a header on your miata, and want advice in an S forum?
Punctuation matters:
Miata, swap header
Miata swap, header
These mean very different things. Sometimes people don't reply when they don't understand what you ae asking. Your poorly explained post isn't helping your cause either.
Maybe you'll get more replies if people aren't confused about what the heck you are doing and asking.
Your poorly worded title had me scratching my head. You are swapping a header on your miata, and want advice in an S forum?
Punctuation matters:
Miata, swap header
Miata swap, header
These mean very different things. Sometimes people don't reply when they don't understand what you ae asking. Your poorly explained post isn't helping your cause either.
Maybe you'll get more replies if people aren't confused about what the heck you are doing and asking.
07-18-2018, 03:46 PM
#3
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That looks like an NA (90-97 Miata) engine bay (pop-up lights motors are visible) with an F-series swap and the OP might be having issues with the exhaust manifold fit?
OP - Not sure if you're looking for installation or tune advice but if so, do a proper tune on the motor once everything is operable. There's been a few shops that have done F-series Miatas. Local to me in SoCal is Indotech Motorsports in Arcadia, CA. Him them up, the owner Alex Tan has a good amount of insight.
OP - Not sure if you're looking for installation or tune advice but if so, do a proper tune on the motor once everything is operable. There's been a few shops that have done F-series Miatas. Local to me in SoCal is Indotech Motorsports in Arcadia, CA. Him them up, the owner Alex Tan has a good amount of insight.
07-31-2018, 03:32 PM
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Thanks for the replies. I don’t post much (first post), and am not up to speed on grammar. But yes, this is a Miata with a S2000 motor. I understand it will be hard to get feedback as most threads go unread, but I’m looking for suggestions on what a 4-1 shorty header may do to my motors performance
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08-02-2018, 08:33 AM
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Manga_spawn. Please forgive me. I’m new and need to learn the order of operations. How do I bring an old thread back to the top of the forum, so people will see it. Or does that happen when somebody replies on the thread?
08-02-2018, 08:36 AM
#9
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The thread gets bumped back to the top every time someone replies. If you post an update in that thread it will get moved back up to the top.
Edit merged the threads.
Edit merged the threads.
08-02-2018, 08:53 AM
#10
Hmm good question, my guess is it will be a more peaky powerband. You may lose some area under the curve, not that this motor had much to spare to begin with. There isn't much scavenging time which normally helps evac the gas pulses and build trq and power over the broad rpm range. I'm not an expert in header design, but from what I know, this would be my initial thoughts. Would be interesting to see you dyno this thing and get a graph overlay with a relatively stock S2000. Hopefully you will be tuning this motor with vtec control to get the most out of it. Either way it should be a lot faster then the stock miata engine!
Last edited by s2000Junky; 08-02-2018 at 08:55 AM.