Installed downpipe with no internals! Help plz!

Yes it helps keep the pressure up but because of the flow there's no dips in pressure at peak TQ. Meaning consistent AFRs if those dip you could knock and have a bad time.

Pressure \= flow, upgraded internals will keep that pressure with increased flow which is good.
 
MajinSpeed3 said:
So then why get them at all? I thought the whole point of hpfp internals was to ensure the fuel pressure can maintain and not spike or drop. Enlighten me. I guess I. Just trying to make sure I understand why they are so important. I have a kit coming from cobb. But knowing why is important too.
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HPFP internals won't raise your fuel pressure, however they'll prevent your fuel pressure from dropping when your ECU is commanding fuel.

https://blog.edgeautosport.com/hpfp-internals-upgrade-for-your-mazdaspeed-3-and-6
 
...that blip of 300 psi and fuel cut will send piston 3 into orbit.

Got a picture of a 2011 speed 3 who 10 years ago did a catless downpipe. Internals came out of orbit at daybreak. Made for a great picof the piston and rod...
0EB29440-9512-4EA9-A1FE-9E2E4176E54D.jpeg
 
The misconception is that the oem hpfp internals can't hit the necessary pressure. This is false. They certainly can hit 1800+ psi but they have trouble maintaining the required pressure. When they dip, motor go pop.
 
See i knew there was a good reason i ordered new internals. Haven't drove it except home from the shop. And to work one day and back. I knew I was going to get internals after I ordered my intake and colder plugs anyway. Just figured I'd do it all at once.

Raider said:
...that blip of 300 psi and fuel cut will send piston 3 into orbit.

Got a picture of a 2011 speed 3 who 10 years ago did a catless downpipe. Internals came out of orbit at daybreak. Made for a great picof the piston and rod...
View attachment 18333
Click to expand...
Sending pistons into orbit is tight.
 
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