over sized crankpully not working

[rollamattae86]

hello people,

Dose anyone know why my nevo 175mm crank pully would be only making 10 psi with the bypass valve already blocked off and i have not put a huge cooler on i have only the 4agze stock one on?

i have tryed everything that i can think off can somone help

[mullett]

Not sure man, what gen of GZE is it? Your supercharger might be knackered, but there's a good chance that it's your boost gauge or where you're reading from. How did you block the ABV off? The best way is an aluminium plate.

RM.

[Ghetto-AW11]

on my first gen gze with nevo it only ever got 10-12psi... never more.

[rollamattae86]

thanks for the replys

my motor has a map sensor im sure that it is the later model and

BPV with a bolt it is very air tight there is no problem there

and the charger sounds fine no un-normal sounds

we have tryed 3 diffrent guages and we are getting the reading of the boost from the inlet manifold

any other idears?

[feral4mr2]

you plugged what pipe with a bolt?

[fixeruperer]

possibly belt slip try tightning your s/c belt.
and possible air leak from any fitting or clamp

[mullett]

That's an odd reply...When I did mine, I removed the ABV (about 1/2 the size of a coke can, will be located on the intake plumbing near the SC), put a plate across the hole it left, and made a plug for the pipe which connected to it with a peice of acetal. That was about 25mm in diam from memory. What did you cap off? Note that this is for an AFM GZE, but I assume the MAP has the same setup.

RM.

[rollamattae86]

thanks again for the replys

the belt i already have tightend and what i have blocked is the (abv) bypass that runs from just under the intake to the super chager and it is air tight i just caped it diffrent

and my motor is MAP not AFM

thanks guys, matt

[clean82]

Matt,

http://www.toymods.net/forums/showthread.php?t=2451

Using the US/Canada diagram on attached post above.

The VSV with line to fuel press reg is brown
The VSV with line to Air bypass valve is light blue.

-Remove line form blue VSV to throttle body and cap the vac line fitting at throttle body. This is the vac line with the one way valve in it.
( I left a small piece of vac line at throtte body fitting then blocked That with screw and quality vac line clamp)

-Remove line from blue VSV at air bypass valve. Now this line then needs to be " T pieced " into the line from brown VSV line that Doesn't go to fuel press reg.

This worked for me on Gen 3 4agze.

If anyone thinks I have got the procedure wrong pls feel free to correct me

Cheer's
Tyrone........

[wiso]

Tyrone if he has physically blocked the the abv with a plug of some sort, doing the vac line mod isn't gonna do shit all

[wiso]

instead of just blocking it maybe you should try taking the whole thing ABV off, what side have you blocked? the side from the ABV to the intake (before charger) or the side from the charger to the ABV (after charger)?

[rollamattae86]

i am telling you guys i have blocked the abv no air can get throught at all.

the small bit of rubber tubbing between the air bypass valve and the charger where the air bypasses when not boosting i have blocked by welding a bolt into the back of the ABV it dose the same job as caping both holes but it was easyer for me to do this way

[wiso]

well no thats all i wanted to know cause if you block off the side to the intake boost can still leak out through the abv. but if you have blocked the side from the charger that should be fine

[clean82]

Tyrone if he has physically blocked the the abv with a plug of some sort, doing the vac line mod isn't gonna do shit all

Ahh, I see, my mistake..

Why stuff around removing the ABV or Blocking it when it can be bypassed?

Anyway I have a NEVO 175mm in the works and I hope to make more than 10psi..

My MAP 4agze in ae82 with stock pulley and cooler and ABV mod sometimes makes 10 psi ( cold canberra mornings/evenings )

Cheers
Tyrone.

[wiso]

not really a discussion for here but when trying to run that much boost, doing the vac line mod isn't going to be enough to hold the ABV closed, the ABV will still leak a little boost. when installing a nevo the best thing to do is take it off and block it up

[clean82]

doing the vac line mod isn't going to be enough to hold the ABV closed, the ABV will still leak a little boost. when installing a nevo the best thing to do is take it off and block it up

I stand corrected - Rep point for Wiso

[mullett]

yeah, basically what Wiso said. I played with that, just for the sake of it. Doing the VSV mod allowed me to run about 9-10psi, but it fluctuated all over the place. Removing the thing and capping it ran 10-11 psi (165mm crank pulley), and it was much more linear. If the car isn't making as much power as you think it should, get it to a dyno and check your A/F ratios. Not sure about MAP GZEs, but mine is running extremely rich, a JayCar fuel/air adjuster is in the works now to cure this, and hopefully unleash some more power.

RM.

[wiso]

hey rollamatt just a thought, does your engine have any modifications internally, like hiflowed head, bigger valves etc? cause as Joshtix was saying to me the other day if an engine flows better the boost will not build up in a back log as much so the registered boost will not be as high. Just a thought,

before you changed the pulley was it running 10psi like its supposed to standard?

could your ecu be hitting a boost cut? see if it pops any codes?

[rollamattae86]

There has be no inturnal mods done but i have just done a full rebuild on the motor.

i think i going to try and get a psi reading befor the cooler and see if the cooler is slowing the air flow to much?
might be the problem

before i changed the pully i was getting 8psi

how would the ecu cut boost wouldent i fill that much loss of power?

[wiso]

well on the map engine you ar supposed to be getting 10psi, so if you were only getting 8, there has always been a problem or misreading there, so chances are this has just amplified it

how would the ecu cut boost wouldent i fill that much loss of power?

well the ecu's have a boost cut at 14psi, so if it was hitting that the ecu would be pulling it down limiting it, and no you may not feel a huge loss in power, cause it just brings it down a bit, its not like it cuts boost all together