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Old 12-23-2008, 01:37 PM   #21
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Quote:
Originally Posted by Hi Im Simon View Post
i was using something like this to measure it
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Originally Posted by Savington View Post
Learn to ******* read.
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Originally Posted by the site you ******* posted
Measures from -58 to 1500 degrees Fahrenheit
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Originally Posted by Braineack View Post
I'm with Sav....
Normally I would be too, but I think Sav missed the two key words in what Hi Im Simon wrote, which make a big difference. I think he meant he was using a similar device.
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Old 12-23-2008, 01:52 PM   #22
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Originally Posted by cardriverx View Post
how bout this, what is the diameter of your downpipe, and do you have a cat?
Doesn't matter. Everything that absorbs heat in this world works off temperature differentials. If your EGTs are only 1700 degrees, there is no physically possible scenario that allows the compressor housing to obtain 2000 degrees. None. That is such a basic tenant of not just physics, but COMMON SENSE.

Just for ***** and giggles, I did a quick Google search to see what kind of laser pyrometer would do 2000 degrees. The cheapest one I found was a thousand ******* dollars. Excuse me for not assuming that you own that particular model.

This is simple ****, and not deserving of a thread.
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Old 12-23-2008, 02:15 PM   #23
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piping for exhaust is 2.5'' all the way thru, no cat.
Running AEM EMS management.

for some reason the car doesn't hesitate at all at those AFR's.
I had a spec miata guy drive it too, and he said that it's a bit sluggish but not too bad.
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Old 12-23-2008, 02:25 PM   #24
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Quote:
Originally Posted by Hi Im Simon View Post
piping for exhaust is 2.5'' all the way thru, no cat.
Running AEM EMS management.

for some reason the car doesn't hesitate at all at those AFR's.
I had a spec miata guy drive it too, and he said that it's a bit sluggish but not too bad.
I also have an AEM. I've seen those kinds of AFRs in mine and the car didn't hesitate either, but that's not safe.

Are you running 550cc injectors? If so, pm me.
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Old 12-23-2008, 02:34 PM   #25
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Sav's deduction is right, to a point.

At a point of restriction of flow, additional heat will be created. This happens in both liquids and gases. This problem is often seen in my line of work with regard to fluid dymnamics in hydraulic systems. As a volume of fluid or gas travels under pressure through a restriction point it will increase the temperature of the fluid or gas at that point. The greater the restriction, and the accompanying rise in pressure and velocity through that point, the greater the temp rise.

4 or 5 hundred degrees rise over EGT sounds off, though. I, like Savington, will question the accuracy of the device. Most measuring devices tend to be most accurate in the middle of their operating ranges, and not so accurate at either extreme end. And certainly not outside of their effective ranges. Unless you have the thousand dollar model, of course.

This is the part where I'm supposed to call you a "lint licker." YouTube - Orbitz Office #37
Sav is a potty mouth, but he is very knowledgeable.

Last edited by sixshooter; 12-23-2008 at 03:19 PM.
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Old 12-23-2008, 03:10 PM   #26
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My adult language matches my adult ideas.
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Old 12-23-2008, 03:18 PM   #27
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post your spark table.
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Old 12-23-2008, 04:44 PM   #28
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i'm running 440 injectors, i'll post up my spark and fuel table when i get home.
i know nothing of engine tuning, thus is why i paid someone to tune it.
i was recommended this guy, but i guess he wasn't the greatest choice for tuning miatas.

it definately could be a possiblility that the temperature exceed the instruments upper value and was throwing random numbers.

thanks for helping out

Last edited by Hi Im Simon; 12-23-2008 at 04:56 PM.
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Old 12-23-2008, 04:57 PM   #29
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Quote:
Originally Posted by Hi Im Simon View Post
i'm running 440 injectors, i'll post up my spark and fuel table when i get home.
i know nothing of engine tuning, thus is why i paid someone to tune it.
i was recommended this guy, but i guess he wasn't the greatest choice for tuning miatas.

thanks for helping out
if he's putting AFR's in the 9's, then he's either tuning for e85 cruising or he's a dumbass...he's a dumbass. Hopefully he doesn't get much business.
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Old 12-23-2008, 05:04 PM   #30
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Originally Posted by Rafa View Post
I also have an AEM. I've seen those kinds of AFRs in mine and the car didn't hesitate either, but that's not safe.

Are you running 550cc injectors? If so, pm me.
would it be possible to run your setup and reduce the entire graph by percentage different in injector size? i guess 20%?
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Old 12-23-2008, 05:15 PM   #31
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Quote:
Originally Posted by Hi Im Simon View Post
would it be possible to run your setup and reduce the entire graph by percentage different in injector size? i guess 20%?
read megamanual. If you could follow simple instructions like entering your location, then someone here could probably help you in person.

Make an AFR target table, use MLV to autotune it, then fine tune. You can do it.
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Old 12-23-2008, 06:49 PM   #32
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FYI --
I've done some reading and it appears that the velocity of the exhaust gases can increase from around 300 feet per second in the exhaust manifold up to 2000 feet per second entering the turbine. Knowing that, I will recant what I said about it being possible to be 400 to 500 degrees hotter at the turbine housing. It seems more than possible. It seems probable. The gases will get hotter as they enter the decreasing diameter area in the neck of the turbine housing due to increased speed.
For example:
In hydraulics, a .5 inch diameter smooth pipe with 10 gpm of flow generates 25 BTUs of heat just from the friction of the flow. Doubling the flow to 20 gpm increases the heat output by eight times up to 200 BTUs. Of course, air creates far less friction and drag than hydraulic oil, but the properties remain the same even if the effect is less dramatic in air.

Look mom, I'm a car nerd!
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Old 12-23-2008, 09:04 PM   #33
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And then they reduce again once they exit the turbine. In addition, if the velocity increases by 8x, the time exposure goes down by 8x.
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Old 12-23-2008, 10:06 PM   #34
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here's the tables, i took screen shots. he tuned it using boost fuel correction table.

let me know if you need any other tables.



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Old 12-24-2008, 05:36 AM   #35
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Timing map looks good, mabye a touch conservative but we have total **** for gas out here. Take your car to Sean Church and have him redo the fuel map.
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Old 12-24-2008, 06:03 AM   #36
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i was thinking of going to HB Speed to tune it.
they did a great job on my friends subaru and they have tuned many miatas.
only thing is they are super booked right now.

Last edited by Hi Im Simon; 12-24-2008 at 06:16 AM.
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