Skip to content
View in the app

A better way to browse. Learn more.

Ultimate Subaru Message Board

A full-screen app on your home screen with push notifications, badges and more.

To install this app on iOS and iPadOS
  1. Tap the Share icon in Safari
  2. Scroll the menu and tap Add to Home Screen.
  3. Tap Add in the top-right corner.
To install this app on Android
  1. Tap the 3-dot menu (⋮) in the top-right corner of the browser.
  2. Tap Add to Home screen or Install app.
  3. Confirm by tapping Install.

MPFI power?

Featured Replies

what else could you do to get more power out of a mpfi other than:

air intake

spider intake

advance timing

better exhaust

UPDATE!:

better cam

port matching the exhaust

accel superstock coil

mallory 8mm plug wires

NGK plugs gapped to .45 - .50

what else?

 

also, how much HP do you think this would have and how much of that is from the cam?

 

I don't know the science of cams, can a reground one give me better power while keeping the power-band the same? (I don't want a low-end monster thats slow or a top-end beast that is gutless below 5 grand. Of course I am exagerating, but you get my point.:D

 

-AK.

the cylinder heads are where most of the potential power lies. given the same perameters. (cubic inch, compression, fuel) the problem is that most do not have access to a flow bench. i would try port matching the exhaust. you do not want to do this to the intake side as it will create more of a puddling effect. just a suggestion. good luck

  • Author

Bump!

 

Check out my update at the top.

 

-AK.

non turbo engines already have 9.5:1 compression. Its all about how much air and fuel you can get into the combustion chamber....from there, its kinda a science of compbusting it correctly, and then getting it out of the CombChamb quickly.

 

With some small reground cams, and your list of mods...and a spyder intake, id say 140 is not out of the question.

 

With turbo...money is the limit.

 

I read about these older F1 cars, making like, 1000~1500 HP, with small 4 cyl engines....73psi of boost on 102 octane!!!

  • Author

Alright, that seems to be all the mods for the engine right?

 

so, now the exhaust:

What would be a good diameter? 2 inches maybe?, I don't want steal from low end very much.

 

what measurement for a camgrind? again, I would like to rty to keep a good balance.

 

-AK.

Please sign in to comment

You will be able to leave a comment after signing in

Sign In Now

Account

Navigation

Search

Search

Configure browser push notifications

Chrome (Android)
  1. Tap the lock icon next to the address bar.
  2. Tap Permissions → Notifications.
  3. Adjust your preference.
Chrome (Desktop)
  1. Click the padlock icon in the address bar.
  2. Select Site settings.
  3. Find Notifications and adjust your preference.