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Underdrive Pulley Gains (Realworld)

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Old 04-10-2008, 11:03 AM
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Default Underdrive Pulley Gains (Realworld)
Well I am sitting at 398 rwhp and 389 Tq. with my mods in my signature, running through a 35 splined 9" with 4.30's. Will adding a 25% underdrive pulley push me past the 400 mark? Post some results with just adding a pulley. Thanks!!
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Old 04-10-2008, 11:50 AM
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You may or may not see the extra 2 on the dyno, but the UD pulley is almost ALWAYS worth a tenth at the track. Depends on what matters more to you. Beating the next car by a car length or satisfying the dyno goal.
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Old 04-10-2008, 12:06 PM
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i never thought of it that way...good point.
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Old 04-10-2008, 12:06 PM
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7-8 rwhp. I dynoed mine back to back.
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Old 04-10-2008, 01:41 PM
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More concerned about the track but seeing the dyno sheet go past 400 would be nice as well.
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Old 04-10-2008, 02:34 PM
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i think u might see that important 2 hp!!! im at 395 right now stock heads without a pulley and i just got the pulley installed. im going back saturday to get another re-tune and ill see how much hp it adds.
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Old 04-10-2008, 05:07 PM
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Better fuel economy is a plus, considering gas prices.
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Old 04-10-2008, 05:07 PM
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Originally Posted by TXZ28LS1
i think u might see that important 2 hp!!! im at 395 right now stock heads without a pulley and i just got the pulley installed. im going back saturday to get another re-tune and ill see how much hp it adds.
Right on keep me posted
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Old 04-10-2008, 09:00 PM
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mine revs alot better since adding the underdrive pulley even running a twin disk.
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Old 04-10-2008, 09:06 PM
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It would most likely push you to 400, plus the other benefits out weigh not getting one.
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Old 04-10-2008, 09:33 PM
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Originally Posted by Jantzer98SS
7-8 rwhp. I dynoed mine back to back.
That's the only change I made on mine and I gained 7rwhp all the way across the RPM range.
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Old 04-10-2008, 09:42 PM
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does under-driving your accessories cause any problems? Does your AC suck *** now? or your battery run low?
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Old 04-10-2008, 10:13 PM
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You gain more area under curve rather than peak HP with a pulley.

I've seen a solid 1-2 tenths/1-2 mph from a pulley swap. I actually swapped one @ the track once
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Old 04-10-2008, 10:14 PM
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i didnt gain **** on teh dyno. maybe 2 rwhp. but i did loose a consistent tenth of a second and gained 1mph

great mod for the money. all i did was teh crank pulley
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Old 04-10-2008, 10:52 PM
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I ordered a powerbond through Byunspeed. Should be installing it tomorrow. I'll go to the dyno next month to see. I am also getting a cutout so with the 2 I should be over the 400 hp mark.
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Old 04-11-2008, 01:20 AM
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Originally Posted by Damian
You gain more area under curve rather than peak HP with a pulley.

I've seen a solid 1-2 tenths/1-2 mph from a pulley swap. I actually swapped one @ the track once
Yes that is what my dyno comparison showed as well. I think torque & hp were up well over 10 up to peak and 7-8 at peak.
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Old 04-11-2008, 08:51 AM
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With a cutout and a pulley, I would be SHOCKED if you didn't hit your 400rwhp goal. Keep us posted.
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Old 04-11-2008, 01:17 PM
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Originally Posted by Johny GTO
does under-driving your accessories cause any problems? Does your AC suck *** now? or your battery run low?

Anyone??
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Old 04-11-2008, 06:53 PM
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Originally Posted by Jays00ss
Well I am sitting at 398 rwhp and 389 Tq. with my mods in my signature, running through a 35 splined 9" with 4.30's. Will adding a 25% underdrive pulley push me past the 400 mark? Post some results with just adding a pulley. Thanks!!
How are you not over 400 with all your mods in sig??? heads,cam fast 90????
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Old 04-11-2008, 07:16 PM
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Originally Posted by Jantzer98SS
7-8 rwhp. I dynoed mine back to back.
Gained 7rwhp in the upper RPM's.
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