Upping The Boost
 

I was wondering how much i can up the boost with standard computer in a MY00 and not have any problems, also when does boost/fuel cut come in??

67psi.............

1.3 is very common, or 1.4/1.5 if you want a bit more kick

with a boost controller, u can dialout the boost cut.
stock boost cut hits at 1.1-1.2 bar depending on how sensitive it is at the time

no wonder you knockin at 3500rpm andy :D

odd.. i hit boost cut often :p
1.3, and Im running a boost controller

[QUOTE=Andy]67psi.............[/QUOTE]

is that all?

:)

easy to get rid of boost/fuel cut...windscreen washer restrictor/1 way valve tee'd from std boost solenoid...run 1.4 bar then if u wish

[QUOTE=DAN682]is that all?

:)[/QUOTE]


trucks do it, why cant we :D

[QUOTE=slugwrx]easy to get rid of boost/fuel cut...windscreen washer restrictor/1 way valve tee'd from std boost solenoid...run 1.4 bar then if u wish[/QUOTE]

That's really clever!

I thought about it, and i worked out to do it really neatly, you'd need two tee pieces and a pair of check valves. That way the most that the MAP sensor would see is about 50kpa of boost (half a bar, 7psi) - but it'd still see a full vacuum signal when there's no boost present, and it'd still be able to sense atmospheric pressure.

The solution I came up with is

- Run a tee from the diaphragm line on the other side of the restrictor
- Check valve so that positive pressure only comes out
- Tee it in before the line to the 3-port solenoid input
- Add a check valve so that only vacuum comes from the manifold

Incredibly difficult to describe, so i present for you this very bad diagram:

[img]http://www.innaloo.net/~wattsg/boost%20control.jpg[/img]

Would that work - am i right? As far as i can tell, that ought to let you run a lot more than factory boost, and if you added a variable restrictor, you'd get it up to 1.5 bar easily.

the only possible prob is the MY00 runs AFM, not MAP