Turbo Heat Ranges?
12-23-2008, 12:52 PM
#22
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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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12-23-2008, 01:15 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.
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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12-23-2008, 01:25 PM
#24
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Are you running 550cc injectors? If so, pm me.
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12-23-2008, 01:34 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.
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 02:19 PM.
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12-23-2008, 03:44 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
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 03:56 PM.
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12-23-2008, 04:15 PM
#31
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Make an AFR target table, use MLV to autotune it, then fine tune. You can do it.
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12-23-2008, 05:49 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!
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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12-24-2008, 05:03 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.
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 05:16 AM.
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