FI Parts for 914 conversion

Richard Evans · Post by **Richard Evans** » Tue Jan 23, 2001 5:02 pm

I need suggestions on suitable manifolds and throttle bodies to be used in converting a '74 914 to FI using Perfect Power's MIC system. Does anyone know of a company who could fabricate a custom manifold to couple with a commonly available throttle body? Thanks for the input.

turbo6bar · Post by **turbo6bar** » Wed Jan 24, 2001 6:44 am

Hey Richard, you best bet is to try to use some of the stock 914 manifolds and plenum. Then, you can bolt on another throttle body with a better TPS.

As far as who can build your manifold, I understand Steve, [email protected] is having Tracy Grimm (L&J Diesel) build a nice 4 into 1 header. I imagine Tracy can build you a manifold, but bring your firstborn.

It will not be cheap.

jay

Post by **Tom Notch** » Wed Jan 24, 2001 9:02 am

What does the MIC use for a TP sensor? Is it a GM one like my Haltech uses? If so you ould grab a TB off a 3.0L or 2.8L V6 and make a real easy mount for the 914 2L like turbo suggested. That is what I'm doing but as a side mounted one in my Notch. Also does that system have an Idle air control feature?

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Tom Notch

Richard Evans · Post by **Richard Evans** » Wed Jan 24, 2001 7:46 pm

Tom-I'm not sure what kind of TPS is used in the MIC but here is a quote from their manual, "The throttle positing is sensed by a potentiometer uncounted on the butterfly shaft". The price on the the kit is great (sub $500.00) if I can figure out how to source the FI hardware.

Post by **Tom Notch** » Wed Jan 24, 2001 8:32 pm

Does it tell you how to set the brain for zero throttle and full throttle when setting up the system? If so, you can probably use any manufacturers TB complete with position sensor. From the stock VW one like a 914 to a 5.0 muscrat or vette's (which has "Weber" on it!) The coolant sensors will have to be the right values though unless again it tells you how to set the system for a correct value. This would be adding to the cost of the software though so I doubt that one.

Remember this. The size of the TB has little to do with the actual performance of the system as long as it is big enough to flow what the engine needs. The rest of the intake track will probably be your limiting factor if you stay with stock parts. If you go really big, the only thing you need to worry about is throttle modulation coming off idle. Too big will be touchy and maybe harder to tune , somewhat dependent on the number of set points in the mapping. I have stayed a bit conservative on my Notch to keep the manifold vavcumn up for the auto to shift right, but I have 52 mm Bergs on my 2161 T1 and they work very nicely.

$500 is low dollar , what is included besides a brain and manual?

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Tom Notch

Richard Evans · Post by **Richard Evans** » Thu Jan 25, 2001 3:57 pm

Tom-the system is programmable with a laptop and the DOS based app provided with the system. Here is a quote from the manual regarding fuel maps "The MIC computer measures the throttle position and the RPM of the engine and holds 5(throttle) times 16(rpm) fuel values in the Throttle/Rpm map (80 values). The 5 throttle coarse positions on the PC screen are sub-divided each into 8 smaller steps, thus giving 40 different fuel numbers across." Here's a link to their site,http://www.perfectpower.com/.