I always thought that it was a 5:1 FMU. If not then what is the difference? I've heard that they used to use a different type of fuel management, but this MAP Controller was just purchased in 2002. Thanks for any info.

 

The map controller is a electronic device with manipulates the map sensor voltages. This is another bandaid hack, but a rather good one compared to the original temp sensor and relay thing. The FMU is the silver aluminum machined thing usually mounted on the firewall...also referred to as the FPR.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Spunkster &raquo;</TD></TR><TR><TD CLASS="quote">The map controller is a electronic device with manipulates the map sensor voltages. This is another bandaid hack, but a rather good one compared to the original temp sensor and relay thing. The FMU is the silver aluminum machined thing usually mounted on the firewall...also referred to as the FPR. </TD></TR></TABLE>

what he said. the MAP controller is intended to be used WITH the FMU. the map controller basically allows the ecu to see the true manifold pressure of the engine while in vacuum, right up until the boost kicks in. you get much better drivability and it helps eliminate tip-in detonation.

i got to check this out with the J&S ultra safeguard which had this feature built in. it did help with tip in. but getting a turbo helped a lot more.

 

With regard to the abbreviations of the parts that JR deals with... (for reference)

FPR - Fuel Pressure Regulator OR Fuel Pressure Riser
FMU - Fuel Management Unit
MAP Mod - Manifold Absolute Pressure Modifier
IAT - Intake Air Temperature

 

So I have a stock FMU <U>and</U> the JR MAP Controller to regulate the FPR? I guess I don't understand this as well as I thought I did.

 

JR FMU - adds fuel in boost

stock FPR (on the fuel rail) - regulates fuel presseure when not boosting.

JR Map controller - modifies the signal from the map sensor going into the cars ECU - smoothing out the transition to boost (tip in), and preventing the ECU from throwing a code from seeing boost.

 

I should have been more clear - FMU and FPR (riser) are the same thing with two names.

 

Quick, put out an APB with the FBI and CIA, we have reports of animal abuse from the ASPCA. Oh and it seems you have been having trouble with your TPS reports...didn't you get the memo?