cold start FTL
#41
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That's what I had thought too originally, but I had based the 230cc off the FAQ... so I can do some digging, but which is it?
Here's the DIY Turbo FAQ entry on it:
Taken from https://www.miataturbo.net/diy-turbo-discussion-14/diy-faq-all-your-answers-one-big-post-4288/
Here's the DIY Turbo FAQ entry on it:
The 1.6L (230cc) fuel injectors have enough room to run about 5-6psi. However at this level, the fuel pressure required to get enough fuel into the motor through the small injectors becomes so great, that the injectors can actually lock. If you are running more than 140-150rwhp, chances are the injectors are maxed out. A very common upgrade is to install the 1.8L injectors. These will should provide you enough room to run about 7-9psi of boost (170-180rwhp).
94-97 (tan) 265cc - #195500-2180
99-00 (red) 240cc (pass on these) -#195500-4430
01-05 (Lt. purple) 265cc -#195500-4060
94-97 (tan) 265cc - #195500-2180
99-00 (red) 240cc (pass on these) -#195500-4430
01-05 (Lt. purple) 265cc -#195500-4060
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Jerry a.k.a. 'FoundSoul'
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'91 Miata BEGi S3 GT2560 w/ MSPNP - 14.1psi - 253whp, 232wtq
'95 Miata n/a
A few other cars....
Jerry a.k.a. 'FoundSoul'
DIYAutoTune.com
'91 Miata BEGi S3 GT2560 w/ MSPNP - 14.1psi - 253whp, 232wtq
'95 Miata n/a
A few other cars....
#43
yeah, i dunno what the deal is now. even without heat soak it wont restart without tons of effort.
this morning i stopped by Rosenthal, intake temps of 50° coolant at 190°. stopped for about 3 minutes and came back out. Tried to crank it and no go, all temps about the same as when I left it. :(
this morning i stopped by Rosenthal, intake temps of 50° coolant at 190°. stopped for about 3 minutes and came back out. Tried to crank it and no go, all temps about the same as when I left it. :(
have you noticed much of a difference with MAT only, CLT only, or averaged?
seems to me that if your intake temps are 50, and the coolant is 190, averaging them would put you in a spot where nobody's happy... i'm just supposing, though.
#46
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That's what I had thought too originally, but I had based the 230cc off the FAQ... so I can do some digging, but which is it?
Here's the DIY Turbo FAQ entry on it:
Taken from https://www.miataturbo.net/showthread.php?t=4288
Here's the DIY Turbo FAQ entry on it:
Taken from https://www.miataturbo.net/showthread.php?t=4288
i've read that FAQ a lot and never noticed it quoted different numbers than what I'm used to.... hrm
ah well always happy to be proved wrong
#47
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Firstly I don't know that i'd average IAT and CLT for this-- the engine temp is much more critical for this calculation. If you're averaging the two, and IAT is at 50 while CLT is at 190, you need a tiny little PW to start the car, but you're getting a much bigger one because the averaged in IAT reading in bringing the temp used to calculate cranking PW way down to a much lower temp, where a much higher PW is commanded, instantly soaking your plugs and flooding you out.
That would be my theory anyways...
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Jerry a.k.a. 'FoundSoul'
DIYAutoTune.com
'91 Miata BEGi S3 GT2560 w/ MSPNP - 14.1psi - 253whp, 232wtq
'95 Miata n/a
A few other cars....
Jerry a.k.a. 'FoundSoul'
DIYAutoTune.com
'91 Miata BEGi S3 GT2560 w/ MSPNP - 14.1psi - 253whp, 232wtq
'95 Miata n/a
A few other cars....
#48
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I had always used the 205cc value before on the 1.6 and 230cc on the 1.8, probably just forum misinformation which is all too common, and manufacturers really don't make this type of info the easiest to come by alot of the time. This is actually part (not all) of the reason why the AFR number used to set REQ_FUEL when scaling to different injector sizes on the MSPNP MM9093 and MM9495 isn't 14.7-- I had to account after the fact for the true injector sizes so it would scale properly for you guys. It won't change anything though as long as it's consistent.
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Jerry a.k.a. 'FoundSoul'
DIYAutoTune.com
'91 Miata BEGi S3 GT2560 w/ MSPNP - 14.1psi - 253whp, 232wtq
'95 Miata n/a
A few other cars....
Jerry a.k.a. 'FoundSoul'
DIYAutoTune.com
'91 Miata BEGi S3 GT2560 w/ MSPNP - 14.1psi - 253whp, 232wtq
'95 Miata n/a
A few other cars....
#50
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that seemed to have worked. i drove home and parked and waited untill 100* playing with my ait based corrections and PWs some more got it to start everytime from 80* to 108*
hopefully it will do the same tomorrow at 190* CLT and 50* intake.
hopefully it will do the same tomorrow at 190* CLT and 50* intake.
#52
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Actual injector sizes will apply for this as it was tuned with the actual factory injectors in the car, so 230cc for the 90-93, and 265cc for the 94-95.
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Jerry a.k.a. 'FoundSoul'
DIYAutoTune.com
'91 Miata BEGi S3 GT2560 w/ MSPNP - 14.1psi - 253whp, 232wtq
'95 Miata n/a
A few other cars....
Jerry a.k.a. 'FoundSoul'
DIYAutoTune.com
'91 Miata BEGi S3 GT2560 w/ MSPNP - 14.1psi - 253whp, 232wtq
'95 Miata n/a
A few other cars....
#53
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Glad to hear it looks like you've made some progress Scott--
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Jerry a.k.a. 'FoundSoul'
DIYAutoTune.com
'91 Miata BEGi S3 GT2560 w/ MSPNP - 14.1psi - 253whp, 232wtq
'95 Miata n/a
A few other cars....
Jerry a.k.a. 'FoundSoul'
DIYAutoTune.com
'91 Miata BEGi S3 GT2560 w/ MSPNP - 14.1psi - 253whp, 232wtq
'95 Miata n/a
A few other cars....
#56
Anyone know why DIYs cranking/prime table counts down until it reaches 40F then it jumps up again and then continues counting down versus counting down the entire time?
This might just be an error of me not having MT setup to read their MSQ but I don't think that the values themselves would change because of that.
Jerry, what kind of AIT related air density have you used on turbo cars? Just curious if you have a table to share.
This might just be an error of me not having MT setup to read their MSQ but I don't think that the values themselves would change because of that.
Jerry, what kind of AIT related air density have you used on turbo cars? Just curious if you have a table to share.