Quote:
Originally posted by sliminbay
I am still curious as to what is achieveable with let say 46mm PMO's versus my current motronics with SW chip upgrade. Steve W. published very good dyno data showing improvements with his chip few weeks ago. But I really see no data with just carb change on this board. Most are full out conversion with major internal mods.
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In my opinion if the only modification is just removing the Motronic and installing carbs, you would be wasting your money. Other than aesthetics and sound, you really wouldn't be gaining much and the pros probably do not outweigh the cons.
The carbs will allow you to run a much more aggresive camshaft profile (so take advantage of it!) but you must also change the wedged dome Motronic piston to the Carb/MFI type with proper valve relief pockets. These pistons (Mahle) generally also increase the CR as well.
You can make real good power on a carbed 3.2L with the proper piston, camshaft selection, exhaust system (which you have) and higher compression, probably pretty darn close to the numbers being thrown about in the previous posts. Twin-plugging would also allow for an even higher compression ratio, especially for a track car where you can use race fuel as well.
Stick with SteveW and Motronic until the motor comes apart for race prepping. Than you can go hog wild and do many of the same mods (and more!) that were discussed previously.
Let me know how your exhaust system pans out, I would be interested if you come up with something better than George Narbel's headers.
Ralph