Mazdaspeed Forums - Fuel pump internals

Mazdaspeed Forums (http://www.mazdaspeedforums.org/forum/)

- Gen2 MS3 General Discussion (http://www.mazdaspeedforums.org/forum/f544/)

- - Fuel pump internals (http://www.mazdaspeedforums.org/forum/f544/fuel-pump-internals-87680/)

Fuel pump internals

So I know the importants of getting the fuel pump internals or just a new pump in general but does it have to be done after a couple bolt ons...

Some of you older Mazda speed forum guys may remember this guy. Idk his old user name but his real name is Joe. A couple years back is when he was active on here. Anyway he had a 2007 speed 6 and at one time had the fastest(like a 12.9) with stock turbo and bolt ons. Had a switch to turn awd off, something like that. Had also written a lot of write ups on here. He now has a bigger turbo aftermarket waste gate, bov, ap, cold air, dp, exhaust and some more and he says he is still running the same stock fuel pump from the factory today and still had no problem. He doesn't say that you shouldn't and that he isn't going to but he
Did say it might be an unnessary mod to do early into the game(simple bolt ons)

So let's hear some thoughts. I'm not sure what to believe.

A switch to turn off awd? I used to just lift the e-brake one click when I had mine :stooges: Probably fucked the car up good :(

The ECU logic in the gen2 is different than the Gen1 and MS6. There's been many posts discussing it, but basically it tries to over-compensate low fuel pressures.

http://www.mazdaspeedforums.org/foru...closely-69969/

Quote:

The Gen2 platforms appear to have very different logic when it comes to fueling during boost spool up.
The Gen2 platform demonstrates a very different response when DI Fuel Pressre drops. As DI Fuel
Pressure drops below ~1600psi on the Gen2 platform, the ECU will immediately increase fueling by
increasing the Injector Pulse Width (IPW)...which puts increased demands on the fueling system further
dropping the DI Fuel Pressure. The additional fuel is a good safety measure, but this behavior makes it
so Stage1 (S1) calibrations will be calibrated to stay within the capacity of the stock Camshaft Driven
Fuel Pump (CDFP) and not calibrated to their full performance potential. Yes, a S1 vehicle with a
upgraded CDFP will likely be able to make more power because more boost can be safely generated
and higher DI Fuel Pressure can be targeted. This also means that no Stage2 (S2) calibrations will be
created using the stock CDFP unless users want to have boost limited to ~14psi.
Due to this new ECU logic...no aggressive AccessPORT OTS calibration can be run without the
installation of a quality aftermarket CDFP (Camshaft Driven Fuel Pump). The S1 calibrations will
perform better than stock and will likely have less reports of Knock Retard (KR), but to experience the
full potential of the S1 hardware, an upgraded CDFP is recommended.

http://accessecu.com/support/docs/su...%20Support.pdf

Quote:

Originally Posted by Ace99899 (Post 966883)

EDIT: @adlpb beat me to it! LOL

I copied and pasted this information Cobb provided in the differences between gen1 and gen2
as far as the ecu logic related to feuling.

The Gen2 platforms appear to have very different logic when it comes to fueling during boost spool up.
The Gen2 platform demonstrates a very different response when DI Fuel Pressre drops. As DI Fuel
Pressure drops below ~1600psi on the Gen2 platform, the ECU will immediately increase fueling by
increasing the Injector Pulse Width (IPW)...which puts increased demands on the fueling system further
dropping the DI Fuel Pressure. The additional fuel is a good safety measure, but this behavior makes it
so Stage1 (S1) calibrations will be calibrated to stay within the capacity of the stock Camshaft Driven
Fuel Pump (CDFP) and not calibrated to their full performance potential.

Holy crap, I thought that was Finkle posting that, then I went down a post.