CAI done, what next?

Come here to discuss the performance side of our vehicles.
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kevox
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Postby kevox » Tue Jun 13, 2006 9:37 pm

Well I have "experimented" so to say with the gas pedal to see how it affects my mileage.

Here are my "results".

A tank with my average accelerating habits - constantly reving past 3500 rpm to shift to 2nd and then rarely reving up to 3700rpm or higher to shift to any other gears. 21.xx mpg

A tank with easy acceleration - striving to shift into 2nd by the time it hits 3000rpm and then doing the same for all other gears. 21.xx mpg

These are the same figures with and without the CAI.

Now I will admit that I definitely didn't go easy all the time on the 2nd run/example but still a lot more than the 1st so there should have been SOME difference. I donno what to say other than I'm getting used to 21mpg lol.
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black300zx
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Postby black300zx » Tue Jun 13, 2006 9:43 pm

more important that your shift points is how fast you get there. If you're giving it the same amount of gas, but just shifting sooner, you won't see much improvement.

for example - if you give it 40% throttle, and shift at 3.5k, vs the same throttle application and shifting at 3k, there won't be much difference in gas mileage. Now ease up on the gas, AND shift lower, then you'll probably start stretching out the gas mileage.

I wish I could shift at 3700 and get that kinda gas mileage. 3k shifts are high for me, I usually shift around 2500 if I'm pulling out into traffic, 2k if I'm just pulling away from a light or stop sign.
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NDGeist
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Postby NDGeist » Wed Jun 14, 2006 9:20 am

So 4500-6k shifts are bad?

I can't break much over 20mpg with the wrx, it just refuses... 100% highway i'll see perhaps 22mpg, most days i see 18-19. Damn AWD!!!

I do have to admit, I push my car a lil bit more than I need to, but that's the reason to have it.. right? If i wanted to drive like I was in a taurus, i'd buy one. AWD sports cars are fun.. :)
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black300zx
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Postby black300zx » Wed Jun 14, 2006 10:03 am

NDGeist wrote:I can't break much over 20mpg with the wrx, it just refuses... 100% highway i'll see perhaps 22mpg, most days i see 18-19. Damn AWD!!!


j/w - how fast are you going on the highway? In my z there's probably a 2mpg difference between 60 and 75
Eclipse 8443



JL 300/4

ID CD1 pro's on cd1e bodies

peerless exclusive 8" midbasses



(3) e8a.44 - ampless for now :(



check out my ride
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NDGeist
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Postby NDGeist » Thu Jun 15, 2006 5:05 pm

Speedo indicates 80... however it's 5% fast, so probably say... 76mph. (i got smaller tires for autoX, and havn't been autoX'ing all summer. :( )
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black300zx
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Postby black300zx » Thu Jun 15, 2006 5:13 pm

NDGeist wrote:Speedo indicates 80... however it's 5% fast, so probably say... 76mph. (i got smaller tires for autoX, and havn't been autoX'ing all summer. :( )


kick it down maybe 10mph and see if your gas mileage shoots up :)
Eclipse 8443



JL 300/4

ID CD1 pro's on cd1e bodies

peerless exclusive 8" midbasses



(3) e8a.44 - ampless for now :(



check out my ride
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NDGeist
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Postby NDGeist » Thu Jun 15, 2006 5:39 pm

Bah... it'll take too long to get places.. Time = money, and the less late I am for work, the better... Well, that's not really true, cause I don't have a set schedule, so "late" is relative.

Either way, i've got a binary throttle when accelerating, it goes wide open or not at all.
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black300zx
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Postby black300zx » Thu Jun 15, 2006 5:48 pm

NDGeist wrote:Bah... it'll take too long to get places.. Time = money, and the less late I am for work, the better... Well, that's not really true, cause I don't have a set schedule, so "late" is relative.

Either way, i've got a binary throttle when accelerating, it goes wide open or not at all.


Lol - just a suggestion since you said you can't break much over 20mpg. I do love jobs where you have a time frame to get there. At my internship last fall winter I had to be in between 630 and 930.
Eclipse 8443



JL 300/4

ID CD1 pro's on cd1e bodies

peerless exclusive 8" midbasses



(3) e8a.44 - ampless for now :(



check out my ride
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newguy
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Postby newguy » Thu Jun 15, 2006 6:00 pm

All things remaining the same, adding breathing mods can increase gas mileage....of course, most will drive faster and harder to feel the added power (or noise:) )...

On my Altima, my hybrid CAI, header, exhaust and crank pulley took me from 121whp to 149whp on a dynojet 248c....

I've found consistently that the car gets slightly better gas mileage at 80mph than it did at 70-75 when I first bought it 5yrs ago....

On highway runs down to the coast, I average 32-33.5mpg running around 80mph the entire time, running the AC and having 4 passengers and luggage/tools....

The added power lessens the need for downshifts as well, such as when pulling long hills, which saves gas (auto)....

Jeremy
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kevox
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Postby kevox » Fri Jun 16, 2006 12:28 pm

black300zx wrote:more important that your shift points is how fast you get there. If you're giving it the same amount of gas, but just shifting sooner, you won't see much improvement.

for example - if you give it 40% throttle, and shift at 3.5k, vs the same throttle application and shifting at 3k, there won't be much difference in gas mileage. Now ease up on the gas, AND shift lower, then you'll probably start stretching out the gas mileage.

I wish I could shift at 3700 and get that kinda gas mileage. 3k shifts are high for me, I usually shift around 2500 if I'm pulling out into traffic, 2k if I'm just pulling away from a light or stop sign.

Ya I was/do use the same amount of throttle. I never really thought about that.

It' gonna be hard (real hard, lol) but I'll try using less throttle and shifting at a lower rpm for a tank and see if I can bring it up...I'll report back in roughly 2 weeks with the results (I don't go too far so it really does take 2 weeks to finish a tank of gas) - if I'm able to hold back that long and reap the benefits lol.
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