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how does the map sensor usually act on a turbo car?
how does the isolation valve help?

 
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The MAP sensor measures pressure inside the manifold. So on a turbo car under boost, it measures the increase in pressure.

Not a problem so far, but the engine ECU is not programmed to measure positive pressure, so it cannot read it. An isolation valve bleeds off the positive pressure.

 
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You voltage clamp the map sensor so it never sees boost

For example, the car will read positive manifold pressure at 5 volts via the map.

To bypass that you get a voltage clamp and set it for 4.7 volts so the map sensor will never read boost and get confused.

 
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thanks

 
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how do you voltage clamp the signal wire?

 
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Most of the time, you just use a "black box" type deal. Jackson Racing and some other companies make them. I think even cybernation has one. I have the E-manage though. It has a separate map for Airflow adjustment and a voltage clamping feature. It gives you the option to clamp voltage to what ever you specify. The Airflow adjustment map, will let you alter the voltage from the map sensor throughout the RPM Vs. Throttle Position ranges. There are a bunch of ways of doing it though. A bleeder valve is the cheapest, and it's also effective.

 
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This is all i have to say.....

the ECU hates boost, and it will let you know that.

 
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Synapse Engineering's Missing Link is now available for our cars. Its another option for keeping your MAP sensor from reading boost, and fairly inexpensive. http://www.synapseengineering.com/html/ml004.html

 
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nice find man

 
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smokie what is ur voltage at on ur emanage for ur MAP i think mine is at 4.4 and it is still tripping the check engine light

 
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Cars not done yet... I'll let you know though. SHOULD have it tomorrow night. All of my maps are being backed up on a 3.5", so if you want any of the files... let me know.

 
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yea? thought one comes wit the SF kit.

 
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im trying to get that but their on back order.

 
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Does your map work off 5 volts? I used 5 as the example. If your CEL is tripping check the code and see what the exact problem is referenced in your FSM.

You might have the voltage to low. If you do try setting it closer to 4.7 with a volt meter.

 
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turbo discounters includes it in their extreme kit i think u can get it
seperate also.

 
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turbo discounters includes it in their extreme kit i think u can get it
seperate also.

 
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I have one of these for sale for $55 bucks it works real good here is what it does. I know it works because i had it on my 92 integ and im going to use it again for my D17.


Synapse Engineering Missing Link
SE-MissingLink

Product Description:

Eliminates MAP sensor related Check Engine lights for turbo/supercharged Honda and Acura cars.
Produces infinitely adjustable boost pressures requiring no adjustment to Missing Link Valve.
Smoothens vacuum to boost transition, eliminating MAP sensor related misfires and hiccups.
Eliminates numerous check valves for a show quality, professional appearance.
Eliminates the costly chance of a destroyed MAP sensor due to boost operation beyond sensor design parameters

 
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They just got the shipments out this week. I just ordered mine... try Group 5 Motorsport

 
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thanks Deejai35

 
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Its included in the XPP Racing Turbo Kit.... coming soon.

no prob Civic808

 
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i still want to know what boosted2k2 has his e manage map voltage set to

 
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i think mine is at 4.4

 
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I wish I could help... Most likely tomorrow afternoon I'll find out. I think what I should have done is logged the RPM and MAP input when the car was still stock. I'll check my laptop later to see if it's on there. At least that would allow the ECU to still see everything as normal. I can't even remember what the MAP was reading when it was stock... but 4.4V sounds higher than it was. I'll try to see if I saved any of the stuff I logged. What codes are you getting from the ECU?

EDIT: My conclusion right now for you, without talking to anybody is that you're voltage is clamped too high. What the maximum votage at WOT? It's either 4.5 or 5.0V. I'll still try to find out for you... but I think 4.4 might be too high.

 
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interesting....

1. how did u get the program and the usb cable i thought u had to be a greddy dealer to get that
2. p1128 is the code=MAP senosr lower than expected

i mean the damn thing picks and chooses when it want to see boost and not, like it work fine and then two seconds later ill get on it again and it with throw the light

 
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i dont have the tools to set it myself i have to take it back to cincy for that. im 200 miles from the shop that did it

 
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You used to have to be a dealer. But they are still hard to come by. If it says lower... then up the voltage at the RPM the light comes on. (This is exactly why I said I wish I had logged all of this).

If you want to borrow the cable (and the software if you need it) once I have my numbers, PM me... we can work something out (free of charge).