Soviet Era Car, Space Age Turbo. EFR 6758 - Page 4 - Miata Turbo Forum - Boost cars, acquire cats.

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Old 10-15-2012, 04:11 PM   #61
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I thought timing latency had to do with your overall hardware, eg. sensors, igniters, coils! Doesn't matter now since you can't check it!
Where is your 36-1 mounted and how? I am looking to do something on my ATI pulley and seen some 36 tooth wheels I am thinking about mounting on the front (sorry for the thread-jacking!)
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Old 10-15-2012, 04:16 PM   #62
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Quote:
Originally Posted by bcrx7 View Post
I thought timing latency had to do with your overall hardware, eg. sensors, igniters, coils! Doesn't matter now since you can't check it!
Where is your 36-1 mounted and how? I am looking to do something on my ATI pulley and seen some 36 tooth wheels I am thinking about mounting on the front (sorry for the thread-jacking!)
It's a protege OEM trigger wheel and OEM trigger wheel sensor. afaik you should be able to bolt it on to the ATI damper.
https://www.miataturbo.net/ecus-tuni...1-wheel-64544/

I revved the engine a bit and the timing mark didn't "walk". So I assume its not going anywhere I don't need the latency settings.
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Old 10-15-2012, 04:17 PM   #63
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Quote:
Nope, haven't checked and already took off timing plastic plate thingy. Timing latency is only an issue if you're using a CAS for primary tach signal. Stretchy timing belt and all.
are you sure? it's still a delay between the input and output and any mechanical delay inbetween.

Quote:
I revved the engine a bit and the timing mark didn't "walk". So I assume its not going anywhere I don't need the latency settings.
okay cool, just checking. I had a map that increased timing a bunch in higher rpms to prevent the torque from droooooping. Then I found I was dropping out spark angle up top like a bitch, when I finally tuned the latency I found I was pinging in higher rpms now as I was now adding in a bunch of extra timing instead of pretty much just keeping it static...if that makes sense to you.
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Old 10-15-2012, 04:21 PM   #64
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Why does this matter Scott? Please tell, I am ignorant. Does it basically mean that your timing can be more advanced at higher RPM than you think?

Also, if anyone wants to see the timing map that was used for the 400hp pull, it is in Soviet's build thread. Add two degrees to it in boost. I asked for critical feedback, and nobody had jack **** to say. Maybe people will care now :b
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Old 10-15-2012, 04:25 PM   #65
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less advanced.
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Old 10-15-2012, 04:47 PM   #66
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This thread makes me want to build another turbo miata with a real turbo

sad face...
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Old 10-15-2012, 04:50 PM   #67
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right? these turbos are seriously a game changer. but i also need to get in an NB as well.
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Old 10-15-2012, 04:52 PM   #68
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Quote:
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right? these turbos are seriously a game changer. but i also need to get in an NB as well.
Build a 1.8 and swap into NA shell. Then just wait for a super clean NB body to swap it into. Swap NB motor into NA shell. Sell NA.

Pay for material and I will build you a manifold and downpipe.
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Old 10-15-2012, 04:52 PM   #69
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Dear Brain,

Get 01-05 SE
absurdramhorn
EFR
MS3

DOITFGT

kthanxbi
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Old 10-15-2012, 04:53 PM   #70
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But make sure to have Fae do your timing map or your car won't make any power at all.
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Old 10-15-2012, 04:53 PM   #71
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I will... just waiting to come upon some money. Problem is, in my 30 years of life, I've never once stumbled on it. So things aren't looking well for the future.
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Old 10-15-2012, 05:17 PM   #72
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This is exactly why I just picked up a 99-00 motor for my NA. Baby steps, brain.
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Old 10-15-2012, 05:39 PM   #73
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im focused more on getting a new DD...then maybe ill reevaluate the current miata. but im tired of spending money on car and wrenching. i do enjoy just driving it. Maybe 18psi will build an EFR setup and sell it instantly...
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Old 10-15-2012, 05:50 PM   #74
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Quote:
Originally Posted by soviet View Post
Timing latency is only an issue if you're using a CAS for primary tach signal. Stretchy timing belt and all.
Quote:
Originally Posted by bcrx7 View Post
I thought timing latency had to do with your overall hardware, eg. sensors, igniters, coils!
Soviet is incorrect here, bcrx7 has the right idea.

Stretchy timing belts cause JITTER, which means that if you hold the RPM (and requested advance) steady, the timing mark will be jumping around erratically across maybe a +/- 5 range of where it's supposed to be. Jitter is mostly caused by mechanical slop.


Latency, by comparison, describes the electrical delay in the various parts of the system. Mostly, this is the delay between the time that the crank (or cam) sensor passes a tooth and the time that the CPU actually registers this change. It is caused primarily by the analog filtering circuitry (resistors and capacitors) which we use to filter out noise and prevent false triggers. These inherently add some delay to the circuit, which is fixed in length.


Thus, latency is mostly a factor of what sort of sensors you are using and how they are electrically decoded within the ECU. Latency is not affected by how the sensors are mechanically arranged or driven. A circuit which has a latency of 100us is ALWAYS going to have a latency of 100us, regardless of how loose or tight the timing belt it, how accurately machined the teeth on the crankwheel are, etc.
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Old 10-15-2012, 05:55 PM   #75
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Quote:
Originally Posted by Braineack View Post
im focused more on getting a new DD...then maybe ill reevaluate the current miata. but im tired of spending money on car and wrenching. i do enjoy just driving it. Maybe 18psi will build an EFR setup and sell it instantly...
just for you boo
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Old 10-19-2012, 07:04 AM   #76
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dyno vidya

uneventful
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Old 10-19-2012, 02:34 PM   #77
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Shweeet!
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Old 10-22-2012, 04:40 PM   #78
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Was just browsing Facebook and saw this post from full-race
Quote:
"We had 2 customers recently do identical builds. 9:1 SR20DETs with 264 S2 HKS cams, Greddy plenums, GT3076R turbos One was on a log manifold and .63 a/r T3 (Green line), the other was on a twin scroll Full-Race kit and 0.82 a/r (Red line). Both cars at 1.25 bar The log car was actually running a tad leaner and with better coils... still a landslide.
Martin


Overlayed with my dyno...


suck my dick
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Old 10-22-2012, 04:44 PM   #79
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same dyno?
not that it would really matter all that much as long as they're both jets lolz
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Old 10-22-2012, 04:49 PM   #80
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holy bawls. I am hoping just to get that much easily in my MK3 poopra
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