ATI Harmonic Balancer
Thread Starter
TECH Apprentice
Joined: Jan 2017
Posts: 331
Likes: 73
From: Sydney, Australia
ATI Harmonic Balancer Hi everyone,
I'm looking at upgrading my 12 year old PowerBond 25% UDP with an ATI. As I'm in Australia, the car is an 04 Holden Monaro M6 5.7 (equivalent is an 04 GTO). I think the ATI may be more suitable for high rpm and actually work better as a balancer.
However, I'm a little confused as to what is what with the ATI range. They appear to have two series? Anyone know what is the difference? Should I avoid the cheaper ones? Or is just because one lot is 10% and the other 25%? I am looking to retain A/C, or does that just mean it doesn't include the relevant pulley?.
I would have thought I would just choose the 25% version to be equivalent to what I use now, however, I'm thinking I may be better off with a 10%, as I've always felt a bit of accessory drain with the PowerBond. Just give up a HP or two. Anyone have any experience with any of these? Any known fitment issues?
ATI 918844 - 25% U/D with NO A/C
ATI 918845 - 25% U/D with 10% U/D A/C Pulley
Requires shorter belts: Gates #K060760 - 6 rib, #4040390 - 8 rib
ATI 917276 - 10% U/D with A/C Pulley
ATI 917277 - 10% U/D with NO A/C
Belt #s: A/C 4040390, and Accessories 4060775
Thanks
I'm looking at upgrading my 12 year old PowerBond 25% UDP with an ATI. As I'm in Australia, the car is an 04 Holden Monaro M6 5.7 (equivalent is an 04 GTO). I think the ATI may be more suitable for high rpm and actually work better as a balancer.
However, I'm a little confused as to what is what with the ATI range. They appear to have two series? Anyone know what is the difference? Should I avoid the cheaper ones? Or is just because one lot is 10% and the other 25%? I am looking to retain A/C, or does that just mean it doesn't include the relevant pulley?.
I would have thought I would just choose the 25% version to be equivalent to what I use now, however, I'm thinking I may be better off with a 10%, as I've always felt a bit of accessory drain with the PowerBond. Just give up a HP or two. Anyone have any experience with any of these? Any known fitment issues?
ATI 918844 - 25% U/D with NO A/C
ATI 918845 - 25% U/D with 10% U/D A/C Pulley
Requires shorter belts: Gates #K060760 - 6 rib, #4040390 - 8 rib
ATI 917276 - 10% U/D with A/C Pulley
ATI 917277 - 10% U/D with NO A/C
Belt #s: A/C 4040390, and Accessories 4060775
Thanks
The catalog does not display all choices. In fact, the catalog 10% underdrive pulley has the wrong durometer rubber for anything but stock power level. Always call ATI when making an order. They will ask you questions and customize it for your needs, including making a choice of which rubber durometer is best for your setup.
Thread Starter
TECH Apprentice
Joined: Jan 2017
Posts: 331
Likes: 73
From: Sydney, Australia
The catalog does not display all choices. In fact, the catalog 10% underdrive pulley has the wrong durometer rubber for anything but stock power level. Always call ATI when making an order. They will ask you questions and customize it for your needs, including making a choice of which rubber durometer is best for your setup.
Anybody can use the custom order form for an ATI damper, including Summit Racing. But you'll want to talk to the ATI tech support to get the part numbers and options you need. That way you can tell Summit Racing what to order for you.
Odds are you're going to end up with a 10% underdrive with 66 durometer rubbers. The 25% underdrive is just too small to be effective but ATI sells it anyway because people think they want it and it sells..
Odds are you're going to end up with a 10% underdrive with 66 durometer rubbers. The 25% underdrive is just too small to be effective but ATI sells it anyway because people think they want it and it sells..
Thread Starter
TECH Apprentice
Joined: Jan 2017
Posts: 331
Likes: 73
From: Sydney, Australia
Anybody can use the custom order form for an ATI damper, including Summit Racing. But you'll want to talk to the ATI tech support to get the part numbers and options you need. That way you can tell Summit Racing what to order for you.
Odds are you're going to end up with a 10% underdrive with 66 durometer rubbers. The 25% underdrive is just too small to be effective but ATI sells it anyway because people think they want it and it sells..
Odds are you're going to end up with a 10% underdrive with 66 durometer rubbers. The 25% underdrive is just too small to be effective but ATI sells it anyway because people think they want it and it sells..
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Thread Starter
TECH Apprentice
Joined: Jan 2017
Posts: 331
Likes: 73
From: Sydney, Australia
Thanks again, probably unlikely need more than 66 as my car is just a street car with a small cam + heads and all the other usual bits but I do shift at 7000 rpm, so I think the ATI could be worthwhile. I've sent ATI a message anyway.
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The catalog does not display all choices. In fact, the catalog 10% underdrive pulley has the wrong durometer rubber for anything but stock power level. Always call ATI when making an order. They will ask you questions and customize it for your needs, including making a choice of which rubber durometer is best for your setup.
Cool thanks man. I'll definitely have to check it out. It'll have the 40 rubber in there but I was totally unaware it was for basically stock power. I just sent ATI an email to figure out costs on getting them to rebuild it. Better safe then sorry, it's cost me too much to risk it. Plus it's winter here
Thread Starter
TECH Apprentice
Joined: Jan 2017
Posts: 331
Likes: 73
From: Sydney, Australia
I got a response back from ATI, just told me to purchase a completely standard diameter unit. Nothing else was said. This was a surprise to me. I've asked a few questions but I won't hear from them for a bit due to time zone differences I would imagine.
Yes, larger diameter unit does offer the best protection and is the right choice from that perspective. But you really need to talk to somebody in a live conversation to talk through pro's and con's of other options. That's how you'll get them to open up and talk more. They have to be more careful what they put in writing in an e-mail.