I made a Boost spike/creep controller from a rad cap...
 

I've been getting boost spikes whenever I go WOT and thought of this easy fix.

First I bought an aluminium Radiator Filler Neck by Moroso:

MOR-63486 $30 CDN

http://img43.echo.cx/img43/8461/mor634862uh.jpg

Then I bought a 13psi Radiator cap from Walmart for $5 CDN:

http://img43.echo.cx/img43/7919/t13radcap7ye.jpg

All you need to do is drill a bunch of holes all around the side of the filler neck and weld it onto your charge pipe or intercooler. Since the neck is aluminium you can either buy a small length of aluminium pipe & hose clamps to insert it into your charge piping or weld it directly onto your intercoolers end tank. I welded mine right onto the back side of my IC's inlet tank. Then you just twist on the cap (not all the way, just half way so it holds the spring down tight) and bingo you've got a safety air-bypass.

They sell the radiator caps in a bunch of different psi settings: 7psi, 13psi, 16psi etc.

So if in the future you want to increase the boost, just buy the next rad cap up and your set. I have my MBC set to around 12.5psi so when I smash the gas the boost fly's upto 13psi and comes down to 12.5. Just incase something happens to my wastegate line I won't blow up my engine because this rad cap will bleed off all the extra boost past 13psi. I'll post up a picture of the actual cap installed tommorow. ;D

PS: you don't want to turn up your boost controller past the rad caps psi because it will cause your turbo to spin faster than it needs to be, causing its efficiency to drop. 8)

Re: I made a Boost spike/creep controller from a rad cap...
 

genius!

Re: I made a Boost spike/creep controller from a rad cap...
 

Quite interesting and clever. How'd you come up with this? just something in your head or seen it someplace? Wanna see some pics of this puppy.

Re: I made a Boost spike/creep controller from a rad cap...
 

Never even heard of something like this, but in theory it sounds real good.

You have done well O0

Re: I made a Boost spike/creep controller from a rad cap...
 

I first saw this done on a trans am years ago. :)
Good work. O0

Re: I made a Boost spike/creep controller from a rad cap...
 

This has been done for a long time, but still good to be pointed out again.

And even cheaper way would be to find a steel tank radiator at the junkyard and just cut that section off with the cap, most junkyards I go to wouldn't even charge for something like that, or maybe a $1 for the cap.

Good times though, and if you can weld aluminum, the moroso style is a clean option. Plus, you want to run without boost, you could just take the cap off ::)

Re: I made a Boost spike/creep controller from a rad cap...
 

nice and creative. but why do you drill holes in the filler neck? im not sure i understand that.

Re: I made a Boost spike/creep controller from a rad cap...
 

Made a post about this a few days ago.
And the responce I got was dont use a radiator cap.

Now this genuine new idea and its sudenlly cool :P

Looks like I missed the bus for some reason :'(

Re: I made a Boost spike/creep controller from a rad cap...
 

^ yeah man its not cool unless a bunch of people say it is. i can't believe you didnt know that

Re: I made a Boost spike/creep controller from a rad cap...
 

Yes sir masa sir what ever you say masa

https://www.homemadeturbo.com/forum/...?topic=41980.0

Re: I made a Boost spike/creep controller from a rad cap...
 

you drill holes in the filler neck to let the boost escape more easily because it will have more than one way out (the over flow nipple)

Re: I made a Boost spike/creep controller from a rad cap...
 

wouldnt that just create a boost leak though instead of just making it not get to a certain psi, or does it not come out until you reach that certain psi (13 in this case)

Re: I made a Boost spike/creep controller from a rad cap...
 

The spring in the rad cap is set to 13psi. So you can boost upto 13psi and it won't ever open. You won't even know its in there. But just incase something happens this will save your ass and bleed off the rest of the boost once it hits 13psi. In my case it helps control my initial boost spike I get with my T25. 8)