Warm air intake, how warm can you go?
I am interesting in modifing my intake to get more milage by going warm.
I am wondering what would be a good temperature range with 87 octane fuel, and with 92 octane? Also what FE gains can be achived by warm air intake? |
It differs between engine. You'll have to test to see what temp your engine likes.
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I just made a HAI for my car and I'm seeing positive results. It's hard to tell what impact the aero mods have because I installed everything at the same time, but I did a little A A B (no time for another A) test yesterday and today on the highway, and it seems like the unscientific results were a 3mpg avg. increase. I saw IA temperatures up to about 140F, which worried me a little until I saw that my engine temp gauge in the cluster looked the same as it always does. More quantitative results to follow.
My understanding before I tried this was that trying can't really hurt, its more about how your ECU will handle hot air. Depending on how it does your FE will remain the same or increase. Don't quote me on this, but please correct me if you know more than I do. |
zman -
For my 1999 Saturn S-Series, the upper limit seems to be 179 degrees F. This was documented by lovemysan. I think the hottest I have ever been is 166 degrees F. I like it below 150 degrees F so that I don't have to think about it. Currently I am running with 91 octane to avoid the risk of ping/knock. However, when I ran 87 octane during the height of the gas prices, I never noticed any problems. However, my HAI configuration was probably topping out at 135 degrees F at that time. CarloSW2 |
Wonderboy with 140 degree air you definitly have warm air intake.
Can you tell me how are you measuring the inlet air temperature, and where did you rout your intake to get the warm air? |
I linked to a thread about my car in my previous post. There are pictures there of where I routed the intake. I am just reading intake air temp from my SGII. I would expect mine to get a little more than "warm" (wherever the temperature threshold is) because my highway run was only about 6 miles... it will probably rise above 140 on substantial (hour long?) highway trips... then again maybe not. More results are yet to come.
@cfg83: Could you explain the risk of knock/ping involved with using regular octane gas? Should I consider using 91? |
Wonderboy -
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Here are some quotes from RH77 : Fuel Grades - Post #9 Quote:
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CarloSW2 |
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I saw temperatures in the 140's with my OEM intake today. This was tooling around town all day, lots of low-speed driving and stopping at lights. Plenty of time to heat-soak the OEM intake components. The PCM was pulling fuel like crazy, based on the really negative long-term fuel trims. The trims started back down as the air temp decreased as the car got moving again.
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