Help w/ Engine Swap: 3.2L into 1999
weighing / pricing all of my options for replacement engines in my '99. i'm familiar with what's involved in putting a 3.4L into a '99. not sure about a 3.2L; maybe some folks on here know better than i do.
here's my best guess: the 3.2L is basically a 3.4L with a smaller bore. the 3.2L's use eGas and VarioRam. i already have exhaust that will support a 3.2L, so that leaves: ECU Programming Throttle Body VarioRam my guess is that i can use a mechanical throttle body from a 3.4L and ECU programming identical to a 3.4L. i can then run an extra wire from the DME to the VarioRam actuator and i should be good to go. i am working under the assumption that any 3.2L from 2000-2004 should work fine. am i missing anything? |
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It takes more work to get set up and tuned, but the ability to tinker is pretty entertaining and you don't ever have to go to someone else for tuning again. There's a lot of data acquisition hardware/software you can get for it. There's engine-based traction control. You can even get a digital gauge cluster! But, of course, this isn't cheap. Just a thought. |
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Motec is an interesting, albeit expensive, proposition. probably will save it for another day for two reasons: cost, and emissions compliance. not sure whether Motec can handle a legal OBD II compliant output. maybe you know? for now, this car needs to remain street legal since it will be a weekend toy as well as track beast. |
keep us posted on your progess and decision.
while I am NOT yet in your boat, my 2000, and anyone else here, could be at ANY time. It would be nice to know pretty much whatk ind of hard costs one is going to be looking at to do the various options. my thoughts are that if you are going to keep the car and fix it - it makes no sense to put in the stockmotor - IF you can upgrade to the 3.2 or 3.4 for only a marginal extra amount. given the high costs of even a stock replacement, it makes sense to do the upgrade. the question is which way to go. check with Raby and see what his engine choices/costs are like. i would think that if you could find a low mileage used engine - that might seriously cut down on costs - and that will simply depend on what is out there on the market right now. then you have to assess the labor costs to install the various swaps. keep us posted on what you find out. good luck |
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I suppose that you would use non-egas 3.4L ECU programming. Would that be "close enough" for a 3.2L? I dunno. I don't know if the VarioRam on/off parameters are similar for a 3.2L vs a 3.4L with its longer intake runners and greater displacement.
You might have a problem with using a 2003-04 3.2L engine, though. If I understand the situation correctly, the 2003-04 engines use a cam phaser sprocket system to vary cam timing instead of the "variable chain tension" system used on the 1997-2002 Boxsters. I would be very surprised if the control strategy was compatible between the two systems. I suspect that a 2000-02 3.2L engine would be easier to adapt to your car if you want to retain the non-egas ECU. Of course, you'd really be set if you could find an affordable non-egas 3.4L engine... |
I helped a guy on Renntech do just this. You can use the cable throttle body but you want one from a 3.4, the 2.5 one is too small. Then just treat the motor like a 3.4, use the 3.4 program in the 5.2.2 DME etc. No you can't use the later 3.2. As mentioned by Blue-S, the later PWM adjustment on the variocam is not compatible with the earlier DME without custom programming.
-Todd |
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-Todd |
Motec isn't a necessity. The stock DME is a very powerful unit and is very 'smart". It continues to amaze us with it's ability to conform to engine enhancements of up to 400ccs without the necessity of any intervention.
Insite, Come see me some time... |
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Sounds good...
A couple days notice is all I'll need to ensure my schedule is open for a visit.. |
Are you replacing engine
Insite
Are you replacing your engine? Did the 2.5 expire? Catman |
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How expensive is expensive? This will always be an option for myself as well but if it gets anywhere close to a 3.4/3.2 swap than it doesn't make sense to me as I would rather go with bigger displacement first.
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