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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Old 08-20-2007, 05:52 PM   #1
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Leaf Blower Theory

[Posted to wrong forum... my bad, I'm a newbie ]

Ok,

So everyone has heard about people putting leaf blowers on they're air intake to get a little boost ( I have a non-turbo ) so i finally decided to try something like it.

I used a spare cooling fan off of a jet boat up at the lake. It was rated for 260 CFM. I mounted it before the air box and while testing it, i forgot to latch the lid of the box on and it blew it right off so plenty of power there.



I wired it to a switch in the dash, right under the steering wheel so its nice and hidden. I did a few tests, and as far as performance... there was nothing. But i noticed something else... MPG!

Down the highway I was getting about 25 mpg. Reset the mpg, flip the switch, and i got around 30 mpg.

At first I thought it was worthless and I was going to take it out, but that extra 5 mpg is just enough to keep it around.

Anyone ever tried this on a saab? similar results?

Last edited by Saabotage89; 08-21-2007 at 09:52 AM.
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Old 08-20-2007, 06:02 PM   #2
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*sigh* search for posts by "ng900" this kind of non turbo nonsense does pop up on here from time to time...

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Old 08-20-2007, 06:04 PM   #3
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Quote:
Originally Posted by PaulH View Post
*sigh* search for posts by "ng900" this kind of non turbo nonsense does pop up on here from time to time...

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Old 08-20-2007, 06:05 PM   #4
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nonsense, haha... thanks

i do what i can with what i have
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Old 08-20-2007, 06:08 PM   #5
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if you look online at the high mpg tricks and tips , a lot of the gadgets you buy just bleed off vacuum, which with your forced induction is doing basically the same thing, the engine isnt working to pull in air, pulling a vacuum does require power afterall. Perry
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Old 08-20-2007, 06:26 PM   #6
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After hearing many stories of leaf blowers and such, and then hearing the result of nearly zero gain in performance... it makes me amazed how much air our little turbochargers are really pumping!
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Old 08-20-2007, 10:05 PM   #7
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Since you now have a turbo, don't forget there are electronic dump valve-speakers as well
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Old 08-21-2007, 02:55 AM   #8
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Originally Posted by chriscam84 View Post
After hearing many stories of leaf blowers and such, and then hearing the result of nearly zero gain in performance... it makes me amazed how much air our little turbochargers are really pumping!
yeah... makes you appreciate that turbo doesnt it

just wish i had one...
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Old 08-21-2007, 05:56 AM   #9
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25 on the highway is not correct for a NG900 NA, did this average include city driving mix as well?

When you hit the reset button, you are taking a very 'quick' average of your highway driving, so it will appear high as does it take into account the fuel to get to the highway or up to highway speed.
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Old 08-21-2007, 06:15 AM   #10
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25 on the highway is not correct for a NG900 NA, did this average include city driving mix as well?

When you hit the reset button, you are taking a very 'quick' average of your highway driving, so it will appear high as does it take into account the fuel to get to the highway or up to highway speed.
my saab is gettin old, and probably doesnt get the mileage it used to... 25 mpg was the 'quick' average it gave me on the highway.

with the little blower on it gave me a new average of 30 mpg. i dont know how accurate the read out really is, but i reset the mpg and tested the switch on and off numerous times each, and i got about the same 25 to 30 jump each time, always running the same mph ( 68 ) and same rpm ( 2700 ).

i know that drag and turning are a factor and maybe its all just a coincidence and everything is BS, but it seemed like it was doing something... and if not, at least i tried, and i wont wonder about it anymore
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Old 08-21-2007, 09:40 AM   #11
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Yeah, its a good idea in theory, but the main thing you have to realize its a fan and not a compressor and is rated at 260CFM in an open air environment. Ideally at 2700RPM your engine should only be drawing in 111CFM assuming perfect volumetric efficiency. But doubt that fan has the gusto to break atmospheric pressure, so at best you may just be keeping it just below atmospheric which would explain the increase in MPG.
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Old 08-21-2007, 09:57 AM   #12
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yeah... all that talk about gaining horsepower from crap like this is BS.

haha... there are even sites trying to sell this stuff for $300+ claiming it increases performance.

http://www.electricsupercharger.com/products.html

... sad
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