No more overboost! YEY!

[Subliminal]

Welp, I made the adjustable zener diode from spoolboy's site the day before yesterday. Very easy design. I think the parts cost me around $10...maybe a little less

$2.50 for 50 of the diodes (you only need 2, but they come in 50)
$2.50 for the potentiometer
$2.00 for some fine silver solder
$1.00 for a few little pieces of shrink tube
$3.00 for 2 new tips for the ol' soldering gun.

I found some old chunks of wire i had lying around, and did it up...shrink tube hides ugly soldering jobs.

Then, yesterday, I had a few spare minutes, so I soldered it into the map sensor wiring. That was easy.

Then, very unscientifically, this morning I got in the van with a handy-dandy precision screwdriver (eyeglass), and headed to work. I must have stopped and gotten out and adjusted that thing 10 times on the way here. Overboost, overboost, overboost....no overboost!

On the last adjustment before I got to my office, I finally got it low enough to not hit overboost. I actually went a little too low, as I strayed from blue to green a little on the dawes device. So, on the afternoon drive home it'll be all about turning it up to the very brink of overboost.

What a beautiful little device. I can't see how any other method of 'fooling' the map can compare to this one. The non-adjustable zener, unless you are VERY lucky, is going to cost you a little bit of fuel. The grainger is going to be finicky because of weather (winter to summer)...and this thing is cheap and easy to make!

damon

[akirazx7r]

I wish I could have gotten mine to work last night at test 'n tune. Hit cutout in first gear on every run (boost spike) before the 60' mark. Got to the track and I couldn't remember which way to turn the pot to lower the MAP voltage. Still got 2.1XX 60' though. hopefully after work today I'll join your no more overboost club.

[Subliminal]

It's just light a dimmer on a light in your house. Right is higher voltage, left is lower.

Good luck!

[ludwig340]

Now get a new boost gauge!

Actually, I've got an extra (or two) stock 15-15 ones, but I would guess you'll be going aftermarket.

[Subliminal]

Well, the van already hits 15 psi right now. When I put on the larger wastegate canister and the +20s, she'll need a boost gauge to dial it in. But I'll need more than 15 psi for that. Maybe I can fix my autometer. It's a 30 psi unit. It looks fine, but when the hood closed on it ( ) it just stopped working.

Or maybe I'll just buy a new one. I don't plan on taking the van past 20 PSI, so we'll see.

d

PS - plans were made to be broken.

[Subliminal]

I fixed my boost gauge. The housing was crushed a little, even though it sprung back to where it was before, but a metal piece on the inside was bent, so i put it back to where it was supposed to be. next stop: big can, +20s, afpr, rail, and more boost!