does mazdaracing pullies reall add 14.4hp and 10torque?
10-19-03, 10:35 PM
#1
does mazdaracing pullies reall add 14.4hp and 10torque?
http://mazdaracing.com/pulley.htm
dyno sheet here:
http://www.mazdaracing.com/dynotest.htm
from the picture the crank pulley can take 4 belts. that's a big pulley. i only use one belt so i guess i would want their eliminator pulley when it's available.
dyno sheet here:
http://www.mazdaracing.com/dynotest.htm
from the picture the crank pulley can take 4 belts. that's a big pulley. i only use one belt so i guess i would want their eliminator pulley when it's available.
10-19-03, 11:34 PM
#4
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I the same have both alt and main drive underdrive pullies, never had a problem running hot, and I always used to drive in upper RPMs... both with 2 core rads, and 3 core rads, with an e-fan.
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10-20-03, 12:25 AM
#8
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Originally posted by O 16581 72452 5
This is my first time of hearing something other than bad things about underdrive pullies.
This is my first time of hearing something other than bad things about underdrive pullies.
10-20-03, 12:48 AM
#9
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I witnessed it like i said in my first post, he purchased the car with the underdrive pulleys, his car was running hot and his car's battery would always be dead when he tried starting the car. We replaced them with stock pullies and now his car runs at normal temperature and always starts up fine.
10-20-03, 12:51 AM
#10
Banned. I got OWNED!!!
the answer to your question is hell no!!!
i have had several rx7's come in the shop lately complaining of dead batteries, bad alternators(too much load on the alternator) because of underdrive pulleys. keep in mind these were full street cars with all elec. acc. still being used(radio, ac, heater fan, ecu, etc., etc. ..
Also another problem with the MR pullies is they not only underdrive the alternator but the ac. compressor and power steering as well!!!! so your ac wont be as cold and your power steering will be useless unless you keep the motor revved up!!!
the Racingbeat pullies utilize the stock pulleys for the ac and p/s in combonation with the underdrive pulley
i would only reccomend underdrive pulleys for racecars only with minimum electronics...
i have had several rx7's come in the shop lately complaining of dead batteries, bad alternators(too much load on the alternator) because of underdrive pulleys. keep in mind these were full street cars with all elec. acc. still being used(radio, ac, heater fan, ecu, etc., etc. ..
Also another problem with the MR pullies is they not only underdrive the alternator but the ac. compressor and power steering as well!!!! so your ac wont be as cold and your power steering will be useless unless you keep the motor revved up!!!
the Racingbeat pullies utilize the stock pulleys for the ac and p/s in combonation with the underdrive pulley
i would only reccomend underdrive pulleys for racecars only with minimum electronics...
Last edited by 680RWHP12A; 10-20-03 at 12:57 AM.
10-20-03, 12:55 AM
#11
Banned. I got OWNED!!!
Originally posted by O 16581 72452 5
I witnessed it like i said in my first post, he purchased the car with the underdrive pulleys, his car was running hot and his car's battery would always be dead when he tried starting the car. We replaced them with stock pullies and now his car runs at normal temperature and always starts up fine.
I witnessed it like i said in my first post, he purchased the car with the underdrive pulleys, his car was running hot and his car's battery would always be dead when he tried starting the car. We replaced them with stock pullies and now his car runs at normal temperature and always starts up fine.
i have seen this problem too, again on street cars . not on race cars though
10-20-03, 10:17 AM
#12
It takes more power (albeit slightly) to drive two belts vs. a single belt.
Racing Bleat used to offer an underdriven aluminum pulley set that used a single skinny belt, I don't know if they still sell that setup but that would be my choice.
Racing Bleat used to offer an underdriven aluminum pulley set that used a single skinny belt, I don't know if they still sell that setup but that would be my choice.
10-20-03, 10:26 AM
#13
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No one has really anwsered the topics question. MR claims a 14 HP gain from JUST the underdrive pulleys. Can anyone confirm or deny this claim?
I was checking out the same stuff yesterday. ANd was curious about the same thing.
I was checking out the same stuff yesterday. ANd was curious about the same thing.
10-20-03, 10:35 AM
#14
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a friend of a friend has an 87 turbo 2, the pulley did 12rwhp on the dyno, we were shocked
mike
mike
10-20-03, 11:03 AM
#16
love the braaaap
You don't need underdrive. If you can, just take the emissions off, along with the air pump, A/C if you have it, get an E-Fan, and take power steering off if you have it. Those are the most parasitic pieces on the engine. underdriving the alternator isn't going to do much at all since it doesn't put that much load on it, plus with the A/C gone, the alternator doesn't have to work as hard.
In the end, if you don't mind having no A/C then you don't need the underdrive pulley. As stated above, it can eventually lead to no power at all in the form of an overheated engine.
In the end, if you don't mind having no A/C then you don't need the underdrive pulley. As stated above, it can eventually lead to no power at all in the form of an overheated engine.
10-20-03, 11:14 AM
#17
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ok i have a question.....those underdrive pulleys....which stock pulleys do they replace? cuz when i will have my car on the road im only gonna have the alternator pulley, the crank pulley, the water pump pulley and thats it i think no air pump no a/c no clutch fan.....???
Last edited by Mr BiG G; 10-20-03 at 11:24 AM.
10-20-03, 04:49 PM
#20
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Originally posted by O 16581 72452 5
Your stock e-shaft pulley seperates in half Mr. BiG G, incase you didn't know.
Your stock e-shaft pulley seperates in half Mr. BiG G, incase you didn't know.
10-20-03, 07:36 PM
#21
Originally posted by Wankelguy
It takes more power (albeit slightly) to drive two belts vs. a single belt.
Racing Bleat used to offer an underdriven aluminum pulley set that used a single skinny belt, I don't know if they still sell that setup but that would be my choice.
It takes more power (albeit slightly) to drive two belts vs. a single belt.
Racing Bleat used to offer an underdriven aluminum pulley set that used a single skinny belt, I don't know if they still sell that setup but that would be my choice.
9600rpm shifts all the time in the bridgeport with stock pullies would cause water pump to cavitate and alternator to burn out due to very high rpms it would be spun.
10-20-03, 11:32 PM
#22
That sounds similar to the RB setup.
Does it use a narrower than stock belt?
I think it was 8mm, but I could be mistaken.
The RB Main pulleys also had additional timing marks that made setting timing to max advance much easier.
Does it use a narrower than stock belt?
I think it was 8mm, but I could be mistaken.
The RB Main pulleys also had additional timing marks that made setting timing to max advance much easier.