Open downpipe fuel cut/bucking?

[BuddySpeed3]

Originally Posted by jtimms6 Also read that as long as your fuel pressure stays above 1600 at all times at wot you are fine with your set up and ive taken many logs that all show my pressure between 1655-1750 therefore i assume either my set up isnt demanding enough to absolutely need internals now or the previous owner did internals. So now my question is how would i investigate that? Would i need to open up the fuel pump and see whats in there or are there other methods to check what internals i have? Also i havent measured yet but as long as the intake is same size as stock shouldnt it not make a big difference other then bringing in colder and more air?

Hey man, the only way to know for sure is to take the pump apart. There are several how to's online that take you through this process in detail.

Fuel pressure may be good now in the summer heat, but as soon as winter comes around, the colder more dense air will put a much higher demand on the fueling needs.

The last thing you want to do is leave it up to chance. It's so important that I urge you not to do another pull until you know for sure

Start with ensuring you have upgraded hpfp internals.

Verify that you have no boost or exhaust leaks (Try a smoke machine and upgrade to T-bolt clamps).

Make sure you have no oil or fluid leaks, and that oil is clean, and at max on the dip stick.

Change transmission fluid for peace of mind.

Listen for any potential abnormal engine noises.

Remove oil filler cap and check the timing chain for excessive slack.

Make sure spark plugs are in good shape and gaped correctly (In your case 0.026-0.028").

Check for oil coming out of the valve cover breather and pray that there isn't.

Do a compression and leak down test to ensure your engine is healthy.

Contact an E-tuner and get a tune specific to your parts.

As far as the intake goes, search up MAF CALIBRATION. If you go with an E-tune, the MAF CAL will be taken care of.

No offence but take the modification process slowly. Read and understand as much as you can about this platform. You will enjoy the car that much more because you'll know and understand what you are doing Welcome to the raw beast that is the Mazdaspeed