vacuum pump

[Anonymous]

What would one do about a vacuum source for vacuum needs on a converted turbocharged vehicle?....I would assume a vacuum pump would be needed. I only need brake vacuum power, so I have two options of hydroboost or a vacuum pump.

A turbochared engine will not put out enough vacuum at low enough RPMs while braking would it?...When the engine is brought to an idle or under a coast, would it make any, if enough, vacuum to supply the brake booster?

If not..any ideas on what vacuum pump to use?...Soemthing off a of a Diesel pickup with vacuum booster?

Adam

 

[Anonymous]

Depends on your setup. A draw thru system will have vacuum between the throttle plate and the turbo.
I am going draw thru but also converting my Bronco to hydroboost for space gained in the engine compartment and the power steering pump is already there.

 

[StrangeRanger]

All you need is a vacuum receiver and a check valve, look in Summit or Jeg's. even a blow thru turbo engine makes vacuum at cruise, you just need a way of storing the vacuum until you need it

 

[Anonymous]

Thats what i thought...the only vacuum source i need is Brakes....I may not need a storage unit...the brake booster should be good fro at least 2 and a half pumpso of powered assist...I hope..if not..ill have to go and get something like that...

 

[Anonymous]

I've never used a reciever and most power bake boosters already have a one way valve one them.... As long as you don't try and apply your brakes with the throttle on while your're making boost I'd say you'd be fine without it.

 

[MustangSix]

Turbos don't make boost until load is applied. Most of the time they are running manifold vacuum. I added a vacuum cruise control to the turbo Miata and it works very well. The car is also equipped with a vacuum booster for the brakes.

An additional vacuum canister usually adds more capacity, but the vacuum in the booster itself holds enough for a couple of good stops even with the engine stopped.

The only thing that might potentially give you vacuum/turbo problems might be the modulator on a C4/6 transmission, but there are ways to deal with that.

 

[XFlow_Fairlane]

on my 84 tbird TC I had put in an autometer vac/boost gauge. at idle that car pulled 18" (.400" lift stock cam) that needle would flip from 18psi to 18" vac as fast as you can lift that go pedal for the whoa pedal. I wouldn't worry about it too much as long as you have a good check valve in there.

 

[Mustangaroo]

MustangSix

The only thing that might potentially give you vacuum/turbo problems might be the modulator on a C4/6 transmission, but there are ways to deal with that.

Give me some Idea's as I have to let up on the gas to shift when using full power! At low rpm and boost it shift's fine, but when the pedals down I have to let up off the pedal to shift out of first and second on my C4?

 

[Anonymous]

Get a nice manual transmission . Problem solved.

 

[Mustangaroo]

Not going to happen!

 

[Does10s]

Mustangaroo,
You're going to burn up that tranny doing the lift-to-shift thing. We fried one in Kelly's Falcon very fast doing that. Get a manual valve body. I've got one for a C4 that we're not using. It has about 30 miles on it.
I'm sure there are ways to make the vacuum modulator work but the manual valve body is the way to go.
Hopefully Mustangsix will enlighten us!

Yes, a turbo motor makes plenty of vacuum during idle and cruise. Plenty for power brakes. No problem there. Do make this turbo stuff to difficult. It's VERY easy!
Will

 

[Anonymous]

Give me some Idea's as I have to let up on the gas to shift when using full power!

I think a check valve in the mod line, with a small air bleed between the Ck Valve and the mod would work.

You might also try a shorter modulator "rod".
Pull modulator out, retrieve rod and make one just a few thousands shorter.