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DIY Turbo Discussion greddy on a 1.8? homebrew kit?

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Old 01-10-2007, 11:09 AM   #1
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Default Economy of boost

OK, more like economy with boost, here are my less-than-scientific observations (each time I get gas I fill up and reset the trip meter):

My stock greddy system would routinely give me around 27 mpg at wastegate 5.5 psi.

My greddy system with a BEGi FMU in place of the vortec 12:1 gave me 26 mpg at 6 psi and 24 mpg at 9 psi.

My greddy system with a retuned double check valve BEGi FMU gives me 27 mpg at 9-10 psi.
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Old 01-10-2007, 11:17 AM   #2
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hmmm miata 1.8 n/a miata would struggle to get 20mpg...U drive like an old lady lol :P

edit: whats this double check valve business?
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Old 01-10-2007, 11:17 AM   #3
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i see anywhere from 25-27 with the system the same. However i'm sure you noticed a difference now as you leaned it out from before.
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Old 01-10-2007, 11:51 AM   #4
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I certainly don't get that will all in town driving. Sometimes if I do a great deal of highway I have seen some pretty high numbers, if fact almost 30 once, but usually with a mix I get between 20 and 22.
-Michael-
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Old 01-10-2007, 11:55 AM   #5
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Quote:
Originally Posted by dc2696 View Post
hmmm miata 1.8 n/a miata would struggle to get 20mpg...U drive like an old lady lol :P

edit: whats this double check valve business?
Dude, I don't abuse the car, but it certainly gets driven. You can search for the 2 FMU modification threads from the past couple of weeks.


Quote:
Originally Posted by braineack View Post
i see anywhere from 25-27 with the system the same. However i'm sure you noticed a difference now as you leaned it out from before.
Car pulls much harder, but there is also far greater responsiveness getting into boost and at lower boost. And I expect another big improvement with an added bleed through an adjustable release valve--or whatever simple solution Corky comes up with compared to my elaborate (and evil) plans.
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Old 01-10-2007, 12:15 PM   #6
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my gas mileage really didn't change all that much with the turbo. Still average 24-25mpg easily while beating on the car.
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Old 01-10-2007, 12:33 PM   #7
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I consistently get 30mpg back and forth from tampa to tallahassee, cruising about 65-75mph.
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Old 01-10-2007, 04:19 PM   #8
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24mpg, all city or hard driving on tennessee backroads. I'm pleased.
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Old 01-10-2007, 09:03 PM   #9
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i need dyno time. I'm getting less than 15mpg on average.
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Old 01-10-2007, 09:46 PM   #10
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my car is messed up. 1.8 n/a no mods and I get........ 17-18mpg (city)!!
and around 30mpg cruising 75-80mph!
wonder what it's going to be on the new built engine and than + turbo,
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Old 01-10-2007, 09:49 PM   #11
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Other than being loud and annoying NA...you guys see a test pipe giving any help to MPG?
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Old 01-10-2007, 09:50 PM   #12
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Quote:
my car is messed up. 1.8 n/a no mods and I get........ 17-18mpg (city)!!
and around 30mpg cruising 75-80mph!
wonder what it's going to be on the new built engine and than + turbo,
/\ better gas mileage, haha
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Old 01-10-2007, 10:19 PM   #13
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Quote:
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/\ better gas mileage, haha
I hope!
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Old 01-12-2007, 05:18 PM   #14
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Quote:
Originally Posted by Dhaark View Post
my car is messed up. 1.8 n/a no mods and I get........ 17-18mpg (city)!!
and around 30mpg cruising 75-80mph!
wonder what it's going to be on the new built engine and than + turbo,
I had the same problem when I was in MI. If you do ANY short trip driving without letting the car fully warm-up you'll see this. The car dumps a hell of a lot of fuel through during warm up enrichment. For a while I was averaging 14-15mpg when I was just driving back and forth to school (less than a mile from home). Now that I'm back in TX and commuting 20ish miles to work I'm back at 27 or so.
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Old 01-12-2007, 06:47 PM   #15
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You were driving less than a mile to school every day?!

Good way to shorten the lifespan of many parts on your car. You should've bought a Segway...or WALKED.:gay:
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Old 01-12-2007, 09:10 PM   #16
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i drive around 5 miles each way to school. and than around 8 miles each way to work. it gets hot after a mile or so.
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