Dyno'd AEM and BSD today! Got some A/F questions? - Mazda3 Forums : The #1 Mazda 3 Forum
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post #1 of 25 (permalink) Old 02-19-2005, 12:16 AM Thread Starter
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Dyno'd AEM and BSD today! Got some A/F questions?

Yeah I was kinda surprised with the outcome.
New numbers are 144.66HP & 142.51TQ
I'm not dissapointed only because I kinda knew this might happen.
But the air/fuel is said to be not good at all!
I'm having problems getting sheet to print so I can't scan it at the moment. But I will try to break it down. Maybe someone can shed so light on this.
RPM stock A/F current A/F
3000rpm 13.59 14.43
4000rpm 12.52 13.64
5000rpm 12.14 12.91
6000rpm 12.14 13.61
There is a crazy dip at 5150rpms where the A/F difference is .49

Now is this a problem?
I was wondering how modding the intake on this car will turn out when others are needing tuning with mods as simple as a CAI.
Now either I need tuning or there is a problem some where. Yet I have no CEL's
Whats your thoughts on this.
And this is not a post to scare everyone into think their CAI is causeing them to run lean. As of yet the cause is unknown that is the reason of this post.

2010 Mustang GT
Roush Exhaust
284whp & 294wtq
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post #2 of 25 (permalink) Old 02-19-2005, 03:22 AM
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Dyno'd AEM and BSD today! Got some A/F questions?

is there a way to make our fuel pumps just.. pump more fuel? i know this is probably a stupid question, but i really am not that smart

2002 Titanium Silver BMW M3 SMG
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post #3 of 25 (permalink) Old 02-19-2005, 04:34 AM
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Dyno'd AEM and BSD today! Got some A/F questions?

no this is the same problem i had with the stock intake.

but with the stock it would start at 10: and drop to 7:1. can you say bad.

after it warmed up i got about the same results as you Az. this is in now way as bad as the p5 though. it drops from about 15 to 11 at 5000 rpm

Arizona Mazda owners should check out these sites

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post #4 of 25 (permalink) Old 02-19-2005, 10:46 AM
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Dyno'd AEM and BSD today! Got some A/F questions?

Quote:
Originally Posted by "ryanazarko"
is there a way to make our fuel pumps just.. pump more fuel? i know this is probably a stupid question, but i really am not that smart
Maybe trying to swap out the pump in the RX-8 or even the v-6 6

The Midnight Speeder
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post #5 of 25 (permalink) Old 02-19-2005, 12:01 PM
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Dyno'd AEM and BSD today! Got some A/F questions?

I want to get mine dynoed a second time. How much did you pay to get your dyno done? K&N did mine for free but I would like to see how different dynos compare. Now that I have 12500 miles on my car I would like to see the difference. When K&N dynoed my car it only had 3000 miles on it.

2004 Mazda3 Hatch, Automatic 4-speed, Strato Blue, Chrome Wheels, Limo Tint Windows, Project Car for K&N's Typhoon Intake, K&N Polished Typhoon Intake. Max Stock Power= 134.15HP Max Power after Intake= 138.54HP
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post #6 of 25 (permalink) Old 02-19-2005, 12:20 PM
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Dyno'd AEM and BSD today! Got some A/F questions?

I'm assuming those a/f reading are at wide open throttle, if so that is pretty lean. I'm be a little worried if i were you. I recommend getting a pryometer to keep an eye on your EGTs.


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<--Pics & Info 13.1 @ 110.78 on 8 PSI

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post #7 of 25 (permalink) Old 02-19-2005, 12:25 PM
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Dyno'd AEM and BSD today! Got some A/F questions?

A couple things.

First, running lean is not a result of the fuel pump not pumping enough. Its a result of the MAF being in a different tube than before. The computer doesn't know that, and you are taking in more air than before for any given MAF reading. Apparently our car runs much more normal than a 6s, which were running terribly rich stock and why they picked up a bunch of power. I'm beginning to wonder about any intake that moves the MAF to a different tube.

AzMz, so your gains were only like a couple hp correct? Were you on the same dyno both times? What about temperature and what not. I would expect to see the BSD results a couple on its own, and people have been reporting CAI's at what, 5ish? Something sounds a little fishy. Its too bad too, I'm halfway through my BSD install.

2004 Mazda 3s Sedan 5 spd
removed intake resonator, modified lower airbox
balance shaft delete, independent fog lights
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post #8 of 25 (permalink) Old 02-19-2005, 01:54 PM
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Dyno'd AEM and BSD today! Got some A/F questions?

Quote:
Originally Posted by "Midnight_Speeder"
Maybe trying to swap out the pump in the RX-8 or even the v-6 6
The biggest fuel pump in the world would not help in this case. The thing that limits fuel amount going into the engine is the fuel injectors. At wide open throttle, the ECU is running on open loop. The injectors will be running on a pre-set pulse width (opening time duration). One way to increase fuel is to increase the fuel pressure in the line. The easiest way to do this is with an adjustable fuel pressure regulator. Install it downstream of the OEM fuel regulator in the section of the fuel line before the returning fuel goes back into the fuel tank (this will make the OEM regulator transparent). An adjustable fuel pressure regulator (along with a small fuel pressure gauge, must be a fluid-filled unit to stop the needle from bouncing violently due to hydraulic hammering effect from the injectors opening and closing at high frequency) is a must if you want to do any meaningful engine tuning at all. For more advanced engine tuning, the only really viable way is to replace the factory ECU with an owner programable ECU which can alter fuel and ignition timing (advancing ignition timing and using higher octane fuel will probably net more power than any other mods short of opening up the engine or going force induction).

A good, relatively cheap and readily available fuel pressure regulator is MSD's part number 2220, http://www.msdignition.com/fuel_7.htm .

Back to the original topic. A lean fuel mixture is a good sign, since it's an indication that you are breathing more air (hence, higher power potential output). Now, all you have to do is find a way to add some fuel. Mid-13 is not lean enough to cause any problems unless you start running crazy ignition timing. Even if you decided not to do anything about it, it will not burn a hole in your piston.

Happy tuning.

Joe
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post #9 of 25 (permalink) Old 02-19-2005, 05:05 PM
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Dyno'd AEM and BSD today! Got some A/F questions?

Wouldnt you be able to correct your A/F ratios with an Apexi SAFC? You could get that thing back onto the dyno and do some tuning...other wise the SCT Reflash will more than likely be able to correct this as well, but that wont be out for a while yet.

Sorry to be such a downer but I always told people the BSD delete would only be good for maybe an extra 2-3 HP anyway, the dyno seems to show this at this point. But hopefully you can correct those A/F ratios to get a more accurate example of how much that mod really does.

Dead Thread Revive Cr3w

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post #10 of 25 (permalink) Old 02-19-2005, 05:24 PM
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Dyno'd AEM and BSD today! Got some A/F questions?

*stares ahead blankely*
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