DIY small 16g at ~8.5psi
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Dynapack dyno. A bit less power than I was hoping for, but I'm quite pleased for the money invested. I will post a log of the pull when I get home. Thinner, lower line was at an "improper" ramp time.
Useful things I learned while on the dyno (3 pulls, power pulls only): 1) I accidentally had an old map loaded with EBC DC values set to start opening the WG at 3000rpm instead of 3600rpm. Oh well. Boost held steady otherwise. 2) Apparently I hadn't tuned very well at redline, as I went so rich I thought God himself was powering my injectors. Very rich up top. 3) Dip in power at ~5200rpm is from a very rich region. Some things I haven't figured out: 1) Why would the torque be dropping so much as I climbed into the rev band? 2) Not sure what was causing the richness at 5200rpm, because running the pulls through VE Analyzer didn't alter those cells much. |
torque loss is most likely from the exhaust....sure the boost wasn't dropping a pound or two by redline? really not bad for 8.5psi.
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Originally Posted by Braineack
(Post 245504)
torque loss is most likely from the exhaust....sure the boost wasn't dropping a pound or two by redline?
Boost was pretty rock solid after the transition into max boost (boost DC issue). |
IGN timing will also loose power up top. My Link pulled a full 10* of advance at higher rpm for AIT compensation and the torque curve looked just like that. I still think there's a lot of potential in both the top and bottom end. I expected to see more torque sooner. :dunno:
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Originally Posted by m2cupcar
(Post 245511)
IGN timing will also loose power up top. My Link pulled a full 10* of advance at higher rpm for AIT compensation and the torque curve looked just like that. I still think there's a lot of potential in both the top and bottom end. I expected to see more torque sooner. :dunno:
I have Ben's pulls on tape, so once I figure out how to hook the cam to the computer, I'll upload. Probably just a matter of finding the right drivers/software and a USB cable. |
Originally Posted by m2cupcar
(Post 245511)
I expected to see more torque sooner. :dunno:
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One thing to add that I hadn't thought about...I'm using a paper media air filter from a late '80s Prelude :giggle: That doesn't help low end torque any!
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As promised, a snapshot from the MS log taken during the pull. Also, I'm throwing up a cleaned-up shot of the pull.
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Where did you get your manifold? Did you make it? I'm planning on going with a evo 3 16g and as far as I can tell Im going to have to build my manifold. Do you have and pics of how you did it? Any "wish i would have done this this way" ? Internal or external wastegate?
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I bought the manifold and downpipe as a set from somebody that hadn't ended up using it; he had it made custom by Turbo Tony of GReddy downpipe fame. It's schedule 40, I believe (very thick anyway) and places the turbo real low to allow for the large, straight downpipe. Internal wastegate. If I were to do it again, I would change my intercooler setup, but I absolutely love the manifold/turbo/downpipe combo.
https://www.miataturbo.net/gallery/f...6/11072006.jpg https://www.miataturbo.net/gallery/f..._3__medium.jpg |
By the way: looking back at the logs posted here, and checking my VE table...I was DAMN rich between 3000-4000rpm, you can see it in the log image posted. Looks like VE Analyzer richened up the cells at the way top, which are only averaged in maybe 25% due to the kPa increments), when I hit overboost protection while tuning my EBC. Huh. I've got some almost-out-of-range cell tuning to do by hand.
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