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Old 12-25-2002, 04:29 PM   #1
imprezwrx
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Talking I bought a pulley set

Like the title of the topic says, I bought a set of aluminum pulleys,
and the crank pulley is underdrive. The UD crank pulley weighs
1.2lbs, and both the power-steering and alternator pulleys are said to be .8lbs lighter. How much hp should I expect to gain from this? And wich CAI should I buy? The PRM(cobb) or the Injen?
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Old 12-25-2002, 07:39 PM   #2
rhdude
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HP gains? ~4hp...
Are the UD pulleys the same diameter as the stock?
Have fun with the install
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Old 12-25-2002, 09:22 PM   #3
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Man, that alternator pulley was a doozie. After damaging the alternator housing with "the screwdriver trick," I gave up and took it to the dealer to finish job.
Be sure to reset the ECU, that helps.
- Ken
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Old 12-26-2002, 02:08 AM   #4
imprezwrx
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RHdude, an Under-drive pulley is smaller in diameter than an OEM or stock pulley. And I think you're a bit shy as far power improvements go, you say ~4hp, I'm thinkin' more like 10-12, but we'll see.
And to Dr.Ken, thanks for the tip
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Old 12-26-2002, 08:35 AM   #5
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Quote:
Originally posted by imprezwrx
And I think you're a bit shy as far power improvements go, you say ~4hp, I'm thinkin' more like 10-12, but we'll see.
[gives imprezwrx a belated xmas flame suit.]
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Old 12-26-2002, 11:01 AM   #6
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You don’t actually gain any horsepower but rather you’re freeing up the energy that was used to move the additional mass of the pulley in a lightened pulley. 10-12 HP seems a little excessive doesn’t it? I would go for the Cobb intake but I may take a while to get it.
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Old 12-26-2002, 02:46 PM   #7
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no way in hell you'd gain 10-12hp... UD claims 4hp.
I have heard you don't want a smaller pulley, but rather a stock size, but lighter. I believe the GFB's are like that..

As for intake, Cobb makes a very very good intake, but they are expensive and hard to get your hands on one. Ganzflow's style is very similar, cheaper, and usually easier to get. It's all up to you
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Old 12-26-2002, 02:53 PM   #8
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Ok, thanks you guys for lighting my candle
And I'm a positive guy, so let's deduct your 4hp from my 12, and we end up with ~8hp I'm the kind of guy who sees an ˝full glass, not an ˝empty one, happy new year to all of ya
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Old 12-26-2002, 03:09 PM   #9
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Get a FAT or SPO/AVO intake, they add like 80-100hp
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Old 12-26-2002, 03:20 PM   #10
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80-100hp, i hope that you are just bein sarcastic. as far as the pully goes, i went with the unorthodox racing pully and it is smaller and i hate it. first of all i noticed nothin as for as hp goes, second, it takes power from the accessories to give you more power, so all i notice is everytime im at a light, all my lights dim until i give it gas. not good if your also into a big sterio
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Old 12-26-2002, 03:37 PM   #11
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FAT and SPO/AVO are turbo kits
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Old 12-26-2002, 03:39 PM   #12
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ohhhh
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Old 12-26-2002, 05:35 PM   #13
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Quote:
Originally posted by imprezwrx
Ok, thanks you guys for lighting my candle
And I'm a positive guy, so let's deduct your 4hp from my 12, and we end up with ~8hp I'm the kind of guy who sees an ˝full glass, not an ˝empty one, happy new year to all of ya
I always see the glass as too big.... so let say it adds zero HP, but make it easier for the engine to do its job.
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Old 12-26-2002, 07:59 PM   #14
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Ok ok, so instead of writing that it "ads" hp to the engine, I should've said that it "frees" hp from the engine, since your 165 little ponies have to work less hard to do the same job, is that ok now? Can I go home now?
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Old 12-27-2002, 02:51 PM   #15
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the GFB pulleys are all smaller. Alt, pwr steering, and crank. It says it's so it doesn't underdrive, but i experiance light dimming below 1k rpm. I don't mind at all though. I love them.
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Old 12-27-2002, 05:19 PM   #16
imprezwrx
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DJ, have you witnessed any change regarding re-acceleration???
I mean, if you lift up the the throttle and then pin it back, is there a slight improvement?
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Old 12-27-2002, 09:08 PM   #17
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yes, i really like it when i'm in 3rd rolling @ 3500rpm or more then nail it. It's alot better than stock.
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Old 12-28-2002, 07:02 PM   #18
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Quote:
Originally posted by DJ 9iron
the GFB pulleys are all smaller. Alt, pwr steering, and crank. It says it's so it doesn't underdrive, but i experiance light dimming below 1k rpm. I don't mind at all though. I love them.
Actually, the Crank and Alt pullies are smaller sized but matched to keep the alt from underdriving. The Power Steering is stock sized so it is the only thing that is underdriven. They are also cheaper than the N1 pullies or the UD ones.
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Old 12-28-2002, 09:38 PM   #19
DJ 9iron
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how do you explain my headlights dimming at idle? also, the power steering pulley is in fact smaller!
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Old 12-28-2002, 10:15 PM   #20
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Quote:
Originally posted by DJ 9iron
how do you explain my headlights dimming at idle? also, the power steering pulley is in fact smaller!

Are you sure? J/k

You must have a set I haven't seen before. The GFB's I've seen had the crank smaller with the Alt to match, but the PS was stock size so that was the only thing being underdriven.
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