just tested my exhaust for pressure and got a reading of 3.25 psi
i am not sure of what the pressure should be but 3.25 seem veary high to me for what is basically a open ended bit of pipe


any advie of what it should be i thught around 1 to 1.5 max

_________________
st185 c/s No 2801
mongoose ex
stage 3 turbo
forged pis
K&n induction
baily recur dv
aussie decat pipe
blitz boost controller
Nemesis ecu

When i am at home my wife is my right hand
When i am at work my right hand is my wife

measured where?

Pressure measured in the exhaust manifold it likely to be high due to the angry snail whirling away

Pre turbo scroll you will see incredibly high readings (on boost you could see a couple of bar or so = 30 psi ish plus)

Post turbo the lower the better - I have no idea on actual numbvers but 3.25psi is in keeping with what I would expect post turbo.

I wodul suggest you really need to be measuring thsi after turbo and before any possible restriction such as a silencer or cat - best place for you to diagnose woudl therefore be bottom of the downpipe assuming you no longer have a cat m8. This really needs to be logged on a full chat blast also to see peak at high rpm & boost.

_________________
JP
GT4DC Treasurer

Grey St185 RC
Silver BMW E46 M3
Multicolour yawn Honda VFR400
Silver Honda Civic Type-R

Never thought about measuring exhaust pressure The other week when the Elise was being mapped there was enough exhaust thrust (i.e. flow) to spit the lambda sensor out of the tail pipe....cured by Steve placing a large weight on the stand/bracket holding the sensor

_________________
Don
GT4DC Chairman
1994 Toyota Celica GT-Four ST205WRC JDM 269bhp @ 0.9bar
1994 Toyota Celica GT-Four Special GT 590bhp @ 1.8bar
1989 Van Diemen RF88/89 Formula Ford 1600
2008 Nissan Patrol GU 3.0L ZD30DDTi 154bhp

Don etc,
It is measured (or should be) during turbo design to define the limits of the turbine housing/wheel flow. There is a magic ratio of what pressure should not be seen turbine pressure/boost pressure.

_________________
JP
GT4DC Treasurer

Grey St185 RC
Silver BMW E46 M3
Multicolour yawn Honda VFR400
Silver Honda Civic Type-R

Magic Ratio? I would have thought that the post-turbine pressure should be as close to zero as possible otherwise the turbine performance will be strangled to some degree.

_________________
Don
GT4DC Chairman
1994 Toyota Celica GT-Four ST205WRC JDM 269bhp @ 0.9bar
1994 Toyota Celica GT-Four Special GT 590bhp @ 1.8bar
1989 Van Diemen RF88/89 Formula Ford 1600
2008 Nissan Patrol GU 3.0L ZD30DDTi 154bhp

Post-turbine yes you are correct Don.
Pre-turbine I am correct

_________________
JP
GT4DC Treasurer

Grey St185 RC
Silver BMW E46 M3
Multicolour yawn Honda VFR400
Silver Honda Civic Type-R