aneroid pin

[dokarex]

What would be a reasonable price for an aneroid pin from a 1.6td from a junkyard?

[Faulty Logic]

I live in Dartmouth N.S. and can get you a new rover boost pin from Bosch if you are interested......it puts the 1.6td pin to shame

But from a scrap yard up here i'd pay 5-10 bucks.

[Faulty Logic]

While a more aggressive boost pin is often seen as more desirable, it is not the whole picture.  For maximum power (or economy) the max fuel should be adjusted to be a similar air to fuel ratio across the range of rpms and boost pressures.  To that end, Bosch specifically matches the boost pin profile to the spring rate of the pin spring.  If a more aggressive pin (Rover) is used with a less aggressive spring (AAZ), then the result is that the fuel increases much faster than boost causing a significant increase in the fuel to air ratio.  This is neither good for fuel economy or power as it results in either an excessively underfueled off-boost setting (lacking power) or an excessively over-fueled on boost setting with resultant overly high EGTs.  If installing a more aggressive pin, for best results one should also install the matching spring and adjust the seat height, pin rest height and cone rotation to give an even fueling and then adjust the max fuel screw to the desired power/economy setting.

Andrew

Very true, I was just trying to give the guy some local parts options. And you should always have proper instrumentation prior to fuel or boost tampering.

[allsierra123]

I still have my rover pin sitting on the shelf. Waiting to locate the rest of "those parts" parts to make it better.

[Faulty Logic]

I wasn't trying to knock your offer, just putting out info so folks can make educated decisions.  The rover pin would be an astounding improvement over the AAZ "joke" pin, it's just even better if the other parts are swapped over at the same time.

no knocks taken, we need good informitive posts......but i have do have a AAZ "joke" pin story

for some strange reason my aaz (an early 94 model) did not have a "joke" pin. This engine's been in my family since new....the old man bought it brand new off the lot in 94. and never touched the pump. When i got the rover pin i pulled the cover to find a shinny metal mildly tapered/ ecentric adjustable pin? Also the spring is fairly stiff as much as an a 1.6TD.

[allsierra123]

libby I havent really drove it enough to have any stats on it. But my egt's do read pretty low due to the very short 3" exhaust on my van. its basicly just makes a turn off the turbo and exits directly out the back of the van. It seems to work pretty well. I havent seen a temp over 800 yet. But I havent really climbed any real grades or anything.

[blackdogvan]

Hey Andrew, how about a detailed aneroid pin setup thread? I'm probably very guilty of having a not-so-dialed in pump top section. I recall the spring rate discussion with jimfoo a while back, did you guys ever figure out a spring rate constant (k number) to boost ratio?

[allsierra123]

Mine seriously needs dialed in Its still pretty slow, has good acceleration between 20-55 mph. But its a very heavy van so im not expecting a race car.

[anto]

I think i need a stronger spring on mine.
I have a peugeot 306 1.9 td with originally one of the good pins, loads of extra fuel as boost is added.
However to get even more on boost and to allow me to run less fuel at off boost i grinded my pin for more travel.
After doing this i set my starwheel as high as possible to increase the spring rate but it still isnt enough as when coming on boost im still getting too much fuel.
Would shimming the spring help to stop the boost pin reaching full travel too early. ie more preload on the spring?
Im running 20psi from a gt15, very fast spooling turbo hence why i get so much boost fuelling early on.
Such a balancing act lol

[anto]

But surely the more the spring is compressed at the start the harder it is for the boost to push it down?
Or have i got my physics wrong (very likely!)
Ideally i need a stiffer spring as the turbo spools so quick that the fuel is added before i need it. Ive grinded the cone flat on one side at the angle and depth i need so turning it is a no no. I do have other spare pins anyway so wanted to try that first.