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Old 06-16-2002, 12:14 AM   #1
Mephiska
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Default Boost Monkey + MBC cranked down = too much boost, help!

Okay, so I just installed my Unichip today and at the same time put in my boost monkey. MBC was not installed at this point.

For the preliminary run I set the boost monkey to ~85% TPS and had the boost knob cranked all the way down (to the left). I also had that 3/16th's connector in there on the solenoid line. All the way off I was only seeing 9lbs of boost at full throttle in 4th gear on the freeway. As I was driving I'd let off the gas, crank the boost knob up again then get on the gas again full throttle to see what the max boost would be slowly working my way up with the goal of hitting 15.5 psi.

Now eventually I reached the highest point I could turn up the boost dial and unfortunately I hadn't hit my goal. I was falling short at just over 14psi and to add to the problems my boost gauge vibrates horribly at 1/3rd to full boost and doesn't really smooth out much. The 3/16th's solenoid connector is supposed to allow for a maximum of 17psi but I'm just barely over 14psi.

So not sure why it wouldn't go higher I decided to follow boost monkey's instructions and put in the MBC that came with my Stage Zero in line with the boost monkey. Problem is even with it cranked way waaay down I'm spiking up past 15psi. I say past because the rate I'm seeing the boost go up I'm laying off the throttle for fear it'll just keep going up (20psi or higher, ugh).

Also, last night I put just the MBC in by itself before I put in the unichip or boost monkey, it works fine and I had it set at ~15.5psi. Just for some reason it doesn't want to play nice when hooked up in conjunction with the little Simian.

Any suggestions?

Thanks,
Jason
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Old 06-16-2002, 06:07 AM   #2
Diversion
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I might be confused here, but if you're using an MBC, you're going to totally bypass the 3/16th mod you are using. It's out of the loop with the MBC. The boost monkey has a hose that goes to the turbo housing, and a hose that goes to the wastegate right? The stock turbo actuator is no longer being used once you hook up an MBC.

To me, the Boost monkey is too intricate for something as simple as building your own 2-stage MBC with parts from the hardware store for under $20.

I don't know how the boost monkey works entirely.. I just know that it's basically an MBC with a TPS so that you don't full boost under partial throttle. With the addition of controlling boost inside the car like a simple EBC. Does the Boost Monkey still use the stock actuator?? I wouldn't like that, as I could see the ECU fighting against the Boost Monkey to not allow it to change boost levels.

Perhaps your Unichip has a boost control map on it? And the two devices are conflicting with each other.

Jay
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Old 06-16-2002, 10:38 AM   #3
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Don't both the Boost Monkey, and Shiv's Stage 0 use TPS? I thought you use either one, or the other. Am I wrong here?

Sounds as though Monkey and Stage 0 are "fighting" one another. How does it react with just stage 0 Unichip connected?



Jim
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Old 06-16-2002, 02:02 PM   #4
Mephiska
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Shiv's Stage 0 comes with a ball & spring MBC. The unichip mapping may account for the full boost at partial throttle but I don't think it currently does.

The boost monkey simply takes over control of the stock boost solenoid and uses it as it's own boost actuator.

Yes I know when I had JUST the MBC in the 3/16th connecter wasn't in use at all. The boost monkey has instructions on how to run the piping so that the MBC is placed in-line between the T fitting and the turbo. This is supposed to enable you to have boost above 17psi. I'm not looking to go that high but was hoping I could run it this way in order to attain my 15.5 max psi. The idea is you set your MBC to ~11-12psi and the boost monkey then controls the solenoid to add another 4+ lbs of boost.

Ideally I'd rather not have the ball & spring MBC in at all and just rely on the boost monkey to give me the boost I'm looking for. I was hoping another boost monkey user could chime in here with any ideas on a similar problem they might have had.
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Old 06-17-2002, 07:26 PM   #5
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I would like to know the answer to this question as well.
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Old 06-17-2002, 08:13 PM   #6
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i was under the assumption that you did not need a mbc when running your boostmonkey, because the bm is a boost controller.
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Old 06-17-2002, 09:06 PM   #7
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From what I understand, Boost monkey uses the factory solenoid to control the boost. Which was assumed would only boost to 14 psi. But apparently, with the 3/16 mod, it can go up to 17 psi.
I did the 3/16 mod and did get an improvement in boost.
I'm still waiting for the monkey that I ordered yesterday.
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Old 06-17-2002, 09:30 PM   #8
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I would agree. I put the monkey in and could only get 13-14 psi. I never even hit 15 that I was shooting for either. Not real happy with it so far. I put a e-mail in to webkris to find out if I am doing something wrong on the tuning. But I have never seen it hit 15 yet and I have a boost/fuel defender so I know I am not getting fuel line cut. I also have not gotten the thing to do 14 in every gear. Have you had that problem? Maybe just my tuning of it. But so far no luck on the monkey alone. Can't seem to get it to do what they say it does.
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Old 06-17-2002, 09:35 PM   #9
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Volley, Have you tried the 3/16 mod?
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Old 06-17-2002, 09:44 PM   #10
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Volley, Have you tried the 3/16 mod?
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Old 06-17-2002, 09:44 PM   #11
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Volley, Have you tried the 3/16 mod?
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Old 06-18-2002, 04:17 AM   #12
Mephiska
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Okay I just got back from a long run on the freeway. I have the 3/16th mod in as-per instructions. I'm maxing out only momentarilly at around 14.5 psi still and then it drops down and holds between 13.5 and 14 psi. The boost dial on the unit is maxed out. I didn't get ambient air temp but it was midnight and the air was nice and cool outside. This was in repeated 4th gear pulls from just under 3k rpm and I held it until, well, let's just say as long as I could =p.

I emailed Kris about it a couple days ago but still haven't heard back from him. I'd really love this thing if I could just get it to max out at 17 psi like they claim. That way I'd have some degree of slack so I could turn it up a bit if it's hotter outside or something.

P.S. I know the car's capable of putting out more boost. with just my MBC I can get get it to go way higher than 15psi but, well, using the MBC would kinda defeat the purpose of me getting the boost monkey.
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Old 06-18-2002, 09:04 AM   #13
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Yep...I have the 3/16ths mod too.

Mephiska, do you get that 13/14 boost in every gear?

Thanks
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Old 06-18-2002, 09:14 AM   #14
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I don't have a "factory" boost monkey but I did build one from the diagrams that use to be posted. I'm guessing that the circuit has been revised since then as a noticed bad monkey behavior that required modification.

I noticed the same sort of behavior as described. When I turned down the TPS level so that the Boostmoney kicked in sooner, I got much high peak numbers. Anyone notice this with the factory unit?
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Old 06-18-2002, 09:35 AM   #15
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i have Monkey #14 and it is working just as Kris says. i see slightly lower max boost in 1st and 2nd and the rest i can hit 17-18psi. i even over boosted last week in the morning and hit the fuel cut at 18psi. i have the 3/16 restrictor in place. before that, 15 psi right on the nose. i have no other boost controlling mechanisms installed. i have noticed though a drastic variance in max boost caused by ambient temps. on an 85 degree day i can only get about 14-15 max psi. but when ambient is below 70-75 degrees i can hit 17-18 constantly. i am happy with this

Keith
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Old 06-18-2002, 03:56 PM   #16
Mephiska
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KJR - so sounds like your boost monkey is working properly. Mine is not and I'm trying to figure out why. I'm only hitting 13-14psi in pretty much all gears, 2nd gear is more often only 12-13 psi, and this is with the boost dial on the device turned to max.

I'm going to give what Puff Monkey said a try and see if I can reach the max boost I'm looking for by turning the TPS knob down a bit. Perhaps that's the problem.

Last edited by Mephiska; 06-18-2002 at 04:02 PM.
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Old 06-18-2002, 04:11 PM   #17
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Mephiska, i don't think adjusting the TPS will do much for your boost level issue. i am assuming you have the 3/16 restrictor in place. if so, then you may have a problem with the Monkey internals or the in-line resistor. i have seen these go bad on several electronic pieces. if you haven't done the 3/16 mod, then it sounds like your near the correct specs if it is fairly warm outside. be sure not to turn down the TPS too much for long periods or your EGT's will go real high. whatever the case, i'm sure Kris will do right on his product. he seems like a stand up guy. good luck to you


Keith
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Old 06-18-2002, 04:34 PM   #18
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KJR, what you described is one of the problems I have with the monkey. The monkey claims equal boost in all gears. I have not seen anyone yet say that is happening. If I wanted unequal boost I could stay stock. But I purchased monkey #24 and have never reached above 14psi and generally is only 13 psi with the 3/16 mod. I would be very happy to hit even 15 psi with any regularity.
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Old 06-18-2002, 04:39 PM   #19
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Mephiska, let me know if turning TPS down a bit works.
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Old 06-18-2002, 04:49 PM   #20
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Volley, i am really suprised to hear this. i installed mine w/o the 3/16 and took it for a run, hit 15psi, fine. then came right back and put the 3/16 in and then made a run, 16-17 psi no problem and has run consistantly ever since. i can only see over 17psi when ambient is below 65 degrees.
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Old 06-18-2002, 05:22 PM   #21
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Any idea what voltage readings I'd get on the boost monkey when it's trying to actuate for full 17psi of boost on the stock solenoid? I could hook up a voltometer and have a passenger monitor it while I do some 4th gear pulls on the freeway. If I knew what the max voltage the BM is supposed to be sending for full, max boost then I'd be able to tell right away if the problem is with the boost monkey sending unit of something goofy is going on with the plumbing.
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Old 06-19-2002, 04:59 PM   #22
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Anyone hear from WebKris of Boostmonkey lately? Would have liked to get his two cents in on this. I generally don't like to go off without the owner having a chance to either make it right or explain. But...

The quote is "Full boost in every gear!" which I took to mean equal boost in every gear (aka 15-17psi) which is not the case. It looks like you get lower boost in 1st and 2nd just like stock. The other quote is "The Monkey does not DIRECTLY make HP! It makes more boost." Which may or may not be the case. Some people get more some don't. Unfortunately I do not.

Another quote..."Yet allows full boost in all gears, and boost up to 17psi." and in the same breath "but we chose not to "overdrive" it much further then stock." Some get stock, some get lower than stock, some get higher. There is also a statement covering themselves saying that not all electrical components are the same and you may not get as good as could be if the resistors aren't perfect.

So buyer beware. Understand what this thing does and doesn't do. Hopefully this is just a tuning thing or an easy replacement of a resistor. Let me know if anything works for people out there.
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Old 06-19-2002, 05:08 PM   #23
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make sure to PM Kris. he has always responded in a timely fashion.
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Old 06-19-2002, 05:41 PM   #24
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When I emailed Shiv if the boost monkey would work with his stage 0, he said Yes.

On another note, those that cant get the advertised 17 psi with the 3/16 mod + monkey...when did you change the connector? Before, after, or at the same time of monkey installation?

I have a monkey coming to me, and I hope I can set it to 15 psi if I want to.
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Old 06-19-2002, 06:54 PM   #25
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I did the connector first, then the boost monkey, then stage 0. No major change in readings. One time between battery disconnecting I got 14 pretty consistenly. Then I went back to my 13psi.
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