Vacuum reservoir needed?

[clyde]

When installing an AHU or ALH in a Mk2 Jetta — the gas cars had a vacuum reservoir — is the original vacuum reservoir necessary? The TDi engines have vacuum pumps…

 

[turbodieseldyke]

Mk3 tdi's don't have them. Don't some people remove the vacuum ball from ALH's too?

 

[CanadianALH]

Mk3 tdi's don't have them. Don't some people remove the vacuum ball from ALH's too?

Yes. Guthrie is a big fan of deleting everything except the line from the n75 to pump and the line to the air box. Cleans things up and less places for a vacuum leak. And for a swap this is ideal.

 

[clyde]

Thanks! And who is Guthrie? Surely it ain't Arlo…

 

[Nuje]

Guthrie = @burpod, tuner extraordinaire.

 

[Shenandoah]

No vacuum ball on my Audi TT -> TDI (alh) for years. Haven’t had any issues.

Burpod tune on it…….

Eric

 

[burpod]

havent had a vac ball in years. your good without it no need for the little checkvalve to the n75 either. think about it

 

[PickleRick]

I kept the reservoir in my system because, in theory, you'll have one last time to push the brake pedal if the engine loses power.

It is harder to stand on the brakes to stop a 2 ton suv on 33s than it is a 1.5 ton car on stock tires.

 

[AndyBees]

I used the Vacuum Reserve Ball as well as the check-valve with the ALH install in my 84 Vanagon. I've never had a vacuum leak issue.

Obviously a different vehicle, but my 95 Blazer's brakes work much better with vacuum reserve ball.

 

[G60ING]

I ran the reservoir in my corrados, its good for hvac controls on the early sliding hvac systems that don't use booleen cables. never had an issue having a reservoir.