Manual boost controller

[Darth Vader]

So, I dredged up some of my obscure knowledge from the CTP (Cretaceous Turbo Period) and made an M(ade)B(ackyard)C(ontroller) for the car. Shockingly, it actually works perfectly on this car, too, just as it did on those old 1980s Turbobags I used to run. I've got it adjusted to hold 19 psi peak. It's a bit slower to spool than better aftermarket units might be but, that is totally safe in preventing boost overshoot, which has been insane lately, given the cooler temps and DP/RP combo I have.

Freakin' hilarious how some things don't change. (hah)

 

[gabe755]

thumbs up*

 

[shpankey]

Would love to know how to do this myself... is it something you could do a write up on?

 

[Darth Vader]

Yeah, here it is:

Get a male 1/4" NPT fitting and a matching female

Get a 5/32" ball bearing from a bicycle shop

Get a small, very lightweight utility spring from a hardware store

drop BB into the male fitting, cut spring down a bit and fit it on the BB, fit female fitting. The spring length should allow you to block the airflow (blown from the male end) fully when the fitting is tightened and allow it pass progressively less hindered as you loosen it. Experimentation will lead you right here. Just make sure the spring is really light.

Disconnect the WG hoses, block the smaller one off, get 4' of vacuum hose and put one end on the big fitting on the WG and the other on the nipple you disconnected the big hose from. Cut hose in 1/2 and mount MBC between, with the male end (BB side) facing the compressor housing.

Test, getting into boost in high gear gently. Fiddle with the tension til you get the target boost you want

 

[Mid_Life_Crisis]

get 4' of vacuum hose

Great backyard mod. Not free, but dirt cheap.
I`m assuming you meant four inches, not feet, though.

 

[Darth Vader]

No, I mean at least 4 feet. You want to bring this up in the engine bay so you can adjust it.