Vacuum pump on alternator.

[hunterzed]

G'day guys, I'm looking to turbo my L28 and one of the things I'm trying to nut out is the vacuum. Has anyone used an alternator of a diesel that has the vacuum pump as part of it to provide the vacuum? There are a number of alternators that will bolt straight on with this attachment.

 

Cheers

Steve

[nizm0zed]

Why wont the engine vacuum be sufficient?

 

Is it just for the brake booster?

a turbo motor isnt on boost all the time (would be fun though)

So when your decelleration, cruising, idling, braking ect, there is no boost, and plenty of vacuum for the booster

[hunterzed]

Just thinking about the routing of the hoses. I'd have to tap into the intake pre turbo which isn't a problem but I was thinking about moving some of the vacuum system to clean up the engine bay a bit. The only thing with using a vacuum pump like the one on a diesel alternator is that I'd need to use a storage canister in most cases, especially if I were to use it on a track.

 

The 280zx also uses vacuum for the fan/air con system.

[mayhem]

you need to feed thm oil pressure with drain return dont forget that

im lookin into it for a mate with a 434 small block dart , it has no vacuum at idle and it also increases hp when used on rocker cover to create vacuum in block but if you just diong it for looks i wouldnt ...

the vaccum for brakes on turbo still comes off intake manifold the hose its self should have a pcv style valve in it ... im using a r33 one

[RB30X]

Just thinking about the routing of the hoses. I'd have to tap into the intake pre turbo which isn't a problem but I was thinking about moving some of the vacuum system to clean up the engine bay a bit.

 

Why pre-turbo, isn't this is for the brake booster??

 

I was inspecting my mates FC RX7 turbo the other day and it has a belt driven vacuum pump for the booster. Can't see why, but obviously someone thought they needed it in Japan.

[Ben]

The accessories on the L28ET will work just fine with no vac-pump.

You won't blow up the brake booster, or the carbon canister (providing you relocate the breather line to pre-compressor). A scavenge pump on the crankcase is a good thing - any reduction in pressure there reduces pumping losses, but you don't see many going to the trouble of fitting one.

 

Read up on the topic of turbocharging (the book 'Turbochargers' has several L-series references), and all your troubles will melt away!

[hunterzed]

Thanks for your input guys. As far as tapping into the intake pre turbo for vacuum is that there is no vacuum post turbo. Well not when its under boost anyway. I'm still learning how it all works properly so I can come up with a plan that suits and that I understand myself. 

[Ben]

On blow-through turbocharging, there is no vacuum pre-throttle-body - just the same as an N/A car.

 

Draw through is a different story (well, it's still the same for vacuum, but the TB is located in front of the turbo). Converting the L to a draw-through configuration would require relocation of the throttle-body, and the installation of a turbo with a carbon compressor seal.