I'm installing an OBX underdrive pulley and removing and bypassing the a/c.
What can i expect to gain from this?
HP from pulleys
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boywithamazda
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HP from pulleys
93 mx3 gs-ze, kl31,headers. other exhaust stuff. Intake harvested from a dumpster.
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hgallegos915
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You wont feel that much of a diff.. im guessing like 1 or 2 hp? the underdrive pulley can get annoying because it doesnt et the alternator charge battery right. I have one on my maxima and i have tio keep it at a bit of higher idle. I DID feel a difference in the maxima but thats a 3.0 v6. On the mx3 i doint think u will notice much. Make sure you shave off those small trimmings from the oil pum pump casing. The belt.. as for a 94 probe gt without ac. 
-hec
MX-3 w/ curved neck millenia klde, boosted @ 5 psi. /bov and wastegate are good!/ nitto drag radial/ gutted interior/ millenia red top injectors, vortech fmu/aem wideband/ all bolts ons/ Car put together 100% by me. Mechanic? who needs a mechanic? ew.. real men work on their own cars!
MX-3 w/ curved neck millenia klde, boosted @ 5 psi. /bov and wastegate are good!/ nitto drag radial/ gutted interior/ millenia red top injectors, vortech fmu/aem wideband/ all bolts ons/ Car put together 100% by me. Mechanic? who needs a mechanic? ew.. real men work on their own cars!
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MX3newbie77
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Be careful with that thing . . . http://www.overboost.com/story.asp?id=1283
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kiwi_MX3
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Well consider that the stock pulley weights in at a hefty 2.5kgs
and my under drive one at .960grams, id say every little thing add's
to the overall gains in the long run.
As for harmonics, they are not a issue, balance is!
and my under drive one at .960grams, id say every little thing add's
to the overall gains in the long run.
As for harmonics, they are not a issue, balance is!
Kiwi - Native Bird Of New Zealand, semi-nocturnal, secretive bird
Flightless, though can be found flying firstclass
Poor eyesight, though can spot a good pub at 100yards.
Flightless, though can be found flying firstclass
Poor eyesight, though can spot a good pub at 100yards.
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Yoda
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On a dyno I found the best gains were made when using a stock sized crank and alternator pulley and bolting on only a under drive P/S and W/P pulley. Even then the average was about 5-7whp. Removing the waterpump completely yields the most gains. This plus underdriving the P/S at about 4500rpm at redline yields about 13-15whp @ 6500