Summit Racing underdrive?

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Jul 1, 2008 | 08:38 AM

Intercooler2

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From: North East, MD

Summit Racing underdrive?

Anyone have one?

http://store.summitracing.com/partde...5&autoview=sku

Jul 1, 2008 | 08:58 AM

Redlinez

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From: Fuquay-Varina, NC

I do, like it just fine. SFI approved as well, I don't see where you can go wrong, not to mention the price.

Jul 1, 2008 | 09:06 AM

Intercooler2

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From: North East, MD

Quote:

Originally Posted by Redlinez

I do, like it just fine. SFI approved as well, I don't see where you can go wrong, not to mention the price.

Feel like you got the 10 HP gain other similar unit see? Is the finish okay or should it be powdercoated so it doesn't rust?

Jul 1, 2008 | 09:23 AM

00pooterSS

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From: Dallas

It says they are clearcoated so it should not rust, I would imagine it would over time but not in the near future.

Jul 1, 2008 | 09:33 AM

PAGregSS

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From: Danville,PA

Sweet. I hadn't seen that before. I think I'll have to buy one. Anyone using one of these with a double roller timing set? Just wondering how it clears.

Last edited by PAGregSS; Jul 1, 2008 at 09:38 AM.

Jul 1, 2008 | 12:40 PM

Intercooler2

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From: North East, MD

Just ordered the pulley but passed on the belt and bolt they offer.

Do I need just one belt or two? I don't trust getting belts over the Net and having them be the wrong size so does anyone know what works for this?

Anyone have the GM or other part number for a new balancer bolt and washer? Or can the stocker be reused?

Jul 1, 2008 | 01:13 PM

Red96TA

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From: Bryant/Fayetteville, Arkansas

Get on summit and look up crank bolt or harmonic balancer bolt. They are like 4 bucks. And yes you need a new one.

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Jul 1, 2008 | 02:13 PM

Intercooler2

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From: North East, MD

I asked about that bolt and it is a generic piece. Not going to chance running my motor hard with a $4.00 generic bolt that you hope they have sized right.

Jul 1, 2008 | 11:59 PM

#10

05MBMLS2

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From: Holmes, NY

Quote:

Originally Posted by Intercooler2

I asked about that bolt and it is a generic piece. Not going to chance running my motor hard with a $4.00 generic bolt that you hope they have sized right.

I ordered my summit balancer with the bolt and its a GM bolt they send you not a generic one.

Jul 2, 2008 | 02:07 AM

#11

Intercooler2

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From: North East, MD

Their people are unreal then. The guy point blank on the phone told me it is a generic bolt.

Jul 2, 2008 | 09:09 AM

#12

05MBMLS2

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From: Holmes, NY

Yea the 5.00 bolt that comes up in their recommended parts is an oem GM crank bolt. Some of them summit reps. probally arent too swift i guess.

Jul 5, 2008 | 12:02 AM

#13

jrcws6

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I just installed the Summit UD pulley today. The install was very easy with the right tools. I am impressed with the quality of the pulley for the price. The Gatorback belts that I got with the pulley are a perfect fit. I did some driving to test everything, and there dosen't seem to be any negative side effects from it. I did notice better throttle respose. I'm going to the track Saturday to see if helps with my times.

Jul 5, 2008 | 01:56 AM

#14

jetlag

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From: Southaven, MS (near Memphis, TN)

Quote:

Originally Posted by Intercooler2

Feel like you got the 10 HP gain other similar unit see? Is the finish okay or should it be powdercoated so it doesn't rust?

My car gained 6rwhp/10rwtq. Put the car on the dyno..got baseline runs, installed the pulley, more runs. So it was back to back testing.

Jul 5, 2008 | 02:16 AM

#15

5.slow99

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From: fenton, MO

anybody have a diff pulley than the summit one? lol

Jul 5, 2008 | 09:59 AM

#16

Intercooler2

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From: North East, MD

Quote:

Originally Posted by jrcws6

Do you have the belt numbers and sizes? What tools did you use and any pointers for someone about to do it?

Pics if you have them!

Jul 5, 2008 | 05:32 PM

#17

Redlinez

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From: Fuquay-Varina, NC

25% underdrive is 25% underdrive. I haven't been to the track or anything, but my last car picked up 1 mph and dropped 1/10th consistently. The contruction of it is 2nd to none IMO>

Jul 5, 2008 | 05:55 PM

#18

jrcws6

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From: Albuquerque, NM

Quote:

Originally Posted by Intercooler2

Do you have the belt numbers and sizes? What tools did you use and any pointers for someone about to do it?

Pics if you have them!

Yeah, belt #'s are: GTR-4060763 and GTR-4040377. I used the pulley install tool from Chris (618HAWK), a must have! , a three arm puller with the smaller arms, a spare bolt (M16x2.0) I got at Home Depot to use as a base for the puller, and a torque wrench rated at 250#(rented from Pep Boys) . I also used a 2' section of exhaust pipe to put over the wrench for leverage. I did this all in my garage in about 2 1/2 hrs. The install was prettty straight forward. I broke the bolt loose from up top. Then from underneath, I switched bolts(Home Depot bolt) to use the puller The stock pulley came off easy once I had the right puller. Then I installed the UD pulley with the install tool with ease. I put the old bolt back in and torqued(240#) from up top. Then the new bolt went in at 37# and I turned the wrench about 120deg more. I made sure to put locktite on the new bolt and some RTV sealant on the keyway for the UD pulley. Every thing seem to line up just right. I did a lot of research here to find the easiest ways, and learned that the right tools would save a lot of time. I have a M6 so I put it in 5th gear and used the E brake to prevent the crank from rotating. I will have to wait until next weekend to get track results because of rain, but it definately feels quicker. I will get pics tomorrow.

Last edited by jrcws6; Jul 5, 2008 at 11:34 PM.