just a Q on timing and boost

[restless@westnet.com.au]

just wondering
if boost is related to timing in anyway ?

(example )
if an engine was running 12 deg timing with 10 psi from a PD blower and you drooped the timing back to 10 deg would it lose any boost ??

[andysc3]

Short answer no. The boost will remain constant but you will lose power. I run 18* at 12 psi on my procharged truck. 91 oct and 50% water/meth injection

[restless@westnet.com.au]

ok thanks for that
i was just wondering
as a friend had pd blower put on and it was only making 7psi at the start of the tune then it ended up at 9 psi when the tune was finished ??

[hog]

Interesting question...I'm thinking that it could, but not sure why. Boost is a measure of restriction, more restriction more boost, less restriction less boost all else equal.

Hmm, anyone else have any other input. I know timing can affect turbo apps greatly, but a PD blower..HMMM??

peace
Hog

[Tre-Cool]

partially collapsed cats can cause an increase in boost.

[restless@westnet.com.au]

yes i know

14718

[andysc3]

If the shift points were increased it will add boost.

[restless@westnet.com.au]

THIS one is an M6

[joecar]

yes i know

14718Good pic, thanks.

[andysc3]

When I started tuning I started at 13* and added timing till I got to where I'm at now with 20* and 12psi on a centri. Boost never changed

[auspeed]

I have seen boost rise just from cats being restrictive... not even blocked or collapsed...

we put in some straight through's for testing and boost didn't rise up......

[andysc3]

thats why I dont run cats lol 3" ORY into a 4" mandrel bent exhaust