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Author Topic: Stock Mazdaspeed Miata Turbo Compressor Efficiency, VJ35  (Read 3807 times)
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'95MSM
Fifth Gear
*****
Posts: 6076


Turbo clocked downward, new i/c plumbing


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« Reply #15 on: January 18, 2016, 01:00:52 AM »

There is probably no reason for you to have researched this, so I suspect you aren't aware just how much better the NB cylinder head and cams are. Swapping the NB cylinder head assy onto a 1.8 NA was typically a ~20 whp (and coincidentally ~20%) gain. BTDT, got closer to 27hp, but I could tune for the improved flow.

Sorry to have gotten this far off the topic, but your insights are valuable and I thought they might, in this one instance, benefit from just a tiny bit of fine-tuning.
« Last Edit: January 18, 2016, 01:03:11 AM by '95MSM » Logged

'05 running gear + '95 body
3.63 ring & pinion FM content: Blouch compressor mod, FM-Link, i/c & no-MAF intake.   BEGi: Stainless SGDP w/ metal core performance cat.   Custom stuff: Compressor clocked downward w/ new i/c pipe, big radius throttle elbow, 2.5" mid-pipe w/ Hushpower II, dual 2" axle-back w/ open Supertrapps, Toyota 4 pc cop ignition

245.2 whp on default FM-Link maps (with OEM midpipe)
TheBigChill
Fifth Gear
*****
Posts: 555


« Reply #16 on: January 18, 2016, 04:59:14 PM »

There is probably no reason for you to have researched this, so I suspect you aren't aware just how much better the NB cylinder head and cams are. Swapping the NB cylinder head assy onto a 1.8 NA was typically a ~20 whp (and coincidentally ~20%) gain. BTDT, got closer to 27hp, but I could tune for the improved flow.

Sorry to have gotten this far off the topic, but your insights are valuable and I thought they might, in this one instance, benefit from just a tiny bit of fine-tuning.

No problem at all and thanks for the addition.  My goal isn't to pretend to know everything, and I expected people to have questions, comments, doubts, etc.

I wish there was a way to find whether or not the author was referring to an NA 1.8 or an NB 1.8.  I assumed, that based on the date in which the book was written and released that he was referring to the 1.8 NB.  ..."The new 1.8"...  That is an assumption though on my part.

All this said, on an Normally Aspirated motor that lacks factory variable valve timing, and has no aftermarket head-work done, it's rare to see Volemtric Efficiency exceed even 95%.  I think that the 92.6% calculated for the MSM is realistic, if not a tad optimistic, but 'tis the #'s I got.
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TheBigChill
Fifth Gear
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Posts: 555


« Reply #17 on: October 20, 2016, 05:19:14 PM »

Updating this thread, as the photo became unavailable:


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