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> Is it easy to bump the PSI up and how do you
> do it?

> 81 280ZXT

You got the cheap way;
go get a 1 pipe plug from Home-Depot. Take off the pop off valve and plug the hole.
Put a beader valve between the wastegate and the front of the compressor.
(be careful not to overdo it! 9psi-10psi MAX)
the expensive way;
get an intercooler, exhaust, EVC, blow off valve, and better fuel delivery system. Turn up the boost and have fun!(10psi-15psiMAX)
 

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Very Carefully!

> Is it easy to bump the PSI up and how do you
> do it?

> 81 280ZXT

I would get a aftermarket boost gauge first. Factory one is pretty much worthless, not worth
trusting the life of your motor with. Got mine from JC Whitney, $15.00. Seems fairly accurate.

There is a factory pop-off valve screwed into the intake manifold. Starts dumping boost at around 7.5 psi. The easiest way around that is to find a pipe plug (home depot) the same size and replace the factory piece with that. Safest way is a adjustable pop-off valve (motorsports), just in case your wastegate ever fails, could save your motor. I bought mine, for 100.00 and you can adjust it for different boost pressures.

As far as increasing the boost, there are several nice manual bleeders on the market that I have heard work good, also several electronic boost controllers (expensive) that work even better.

Cheapest (free) way is to bend the factory wastegate arm down some. This increases tension on the internal spring allowing more boost before it releases it. Also kind of touchy, have to be careful not to get too much boost.

As with any boost increase, comes to a point where you will have to look at your fuel supply, intercooling, etc.

Dave
 

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You beat me to it Stew! n/c

> I would get a aftermarket boost gauge first.
> Factory one is pretty much worthless, not
> worth
> trusting the life of your motor with. Got
> mine from JC Whitney, $15.00. Seems fairly
> accurate.

> There is a factory pop-off valve screwed
> into the intake manifold. Starts dumping
> boost at around 7.5 psi. The easiest way
> around that is to find a pipe plug (home
> depot) the same size and replace the factory
> piece with that. Safest way is a adjustable
> pop-off valve (motorsports), just in case
> your wastegate ever fails, could save your
> motor. I bought mine, for 100.00 and you can
> adjust it for different boost pressures.

> As far as increasing the boost, there are
> several nice manual bleeders on the market
> that I have heard work good, also several
> electronic boost controllers (expensive)
> that work even better.

> Cheapest (free) way is to bend the factory
> wastegate arm down some. This increases
> tension on the internal spring allowing more
> boost before it releases it. Also kind of
> touchy, have to be careful not to get too
> much boost.

> As with any boost increase, comes to a point
> where you will have to look at your fuel
> supply, intercooling, etc.

> Dave
nc
 
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