Hey guys,

I'm thinking about doing the boost fooler mod on my truck, and was wondering how "strict" I had to be in sticking with a 10k pot? I'm having a hard time tracking them down in my neck of the woods, but I was able to find a 25k pot at my work. It's variable, and has 3 terminals, but I'm wondering if the value of if would cause me too much grief? Or would it work the same as a 10k, but I just wouldn't have to turn the dial as much to get my values?

Any thoughts or ideas?

Thanks,

Jamie

Possibly, yes it could work if not turned down much. The PCM reads the MAP for boost pressure and a firewall mounted baro for atmospheric pressure, you may have to resist both on an OBDI to properly fool it without DTC.

IIRC 8.5K gives you about 10 psi boost 25K is more than you need, if you can turn it down to to 8.5 K range should be sufficient, remember the bigger the pot the less linear (fine) the adjustment, you will want to fine tune your setting so the 10 K will be easier to do that with. Can't find a 10K pot?? Radio shack or any electronic parts house should have those, or if you are remote nothing like that in your local area go online to electronic supply house, they aren't that expensive.

Thanks for the info QM. I'll try the 25k pot, but I think I'll use connectors so I can hook everything back up stock if I'm not happy with it. If I only do the MAP and get codes, what value of resistor should I put on the MAF?...and what wire does it splice into?

Jamie

Not the MAF (at least not yet) the baro on the firewall. if the signal gets too far apart the PCM will DTC78.

I usually hook up the scanner and set the Pot. to about a 10 psi reading to the PCM (5 psi less than atmospheric at sea level) this will let me hold 15 psi without defuel or DTC.

The signal wire from the MAP and baro are green and labeled "B" on both.

I sodered in a fixed 5K on the signal from the baro and never had issues with it.

Hey TD,

So trying to fine tune a 25k pot might be more of a hassle than it's worth? I'm going to be towing my trailer Friday after work, and was hoping to have this up and running so I could see what, if any, difference it makes.

Radio shack no longer exists in my area, and the few electronics stores around aren't conveniently located. That's why I was wondering about this pot I had at work.

Jamie

Okay, not the MAF. What's the procedure for fooling the baro? I'll do a search for older posts, and see what I can come up with.

Jamie

You shouldn't need to fool baro, just the manifold pressure (boost sensor) set for max 10 psi and you should not code, if you do code dial it down a little.

Which is why th 10K pot is better it will be easiler to find the "happy place" that nets more performance but doesn't code. If 25 k is what you have in hand and time is of essence then try that just mite be more difficult in getting what you want

The only result from using a 25K vs a 10 K pot is that if you turn it up too high, YOU WILL THROW CODES because the values will be out of range of the computer. You have gauges, so you can also moniter the changes with the POT, so turn it down, start to drive, and gradually turn it up until you get to about 12 PSI boost or so. I have pegged my 15 PSI guage, but it's not recommended, due to the weak heads/block some of us may have, and high EGT's. Just be sure to moniter your EGT's when towing with the boost fooled...if they start to climb, turn it down.

Do instructions exist on how to wire this 10k pot? I have new gauges and feel the need for more power Argh Argh Argh.

do a search on POT or try BOOST FOOLER if that doesn't work...it should come up with schematics that have been previously posted...