8 rib vs 10 rib
04-15-2009, 08:31 PM
#1
8 rib vs 10 rib
Can someone give me some real numbers as to the capabilities of an 8 rib setup vs. a 10 rib setup? Three reasons I'm asking:
1) The crank pulley on the ATI 10 rib kit I bought is actually underdriven. I'm not sure why you would make a supercharger pulley kit in an underdrive configuration. It's only a 2.2% underdrive, but still....
2) With the crank pulley being slightly underdriven, you would think that the alternator pulley would be slightly overdriven. Nope. It's underdriven as well. Being forced to go back to e-fans because I'm losing the stock water pump pulley, I want as much idle voltage as possible to run the fans. Not too happy about this either.
3) Availability of 10 rib vs 8 rib belts. I should have thought about this before I ordered, but how difficult is it going to be to find a 10 rib serpentine belt long enough to work with the blower? Would it be easier to find an 8 rib belt in any given length?
Anyway, I'm looking at the possibility of sending the ATI pulley kit back, but I want to make sure that I'm not going to be kicking myself in the future for going with an 8 rib over a 10 rib setup.
I'm asking in regards to a TVS2300 front inlet rear drive, with cog drive in back, on a 403ci engine, looking to make 15-18 psi at the track.
If I ditch the ATI kit I'll order the Innovators West 8 rib kit with the overdrive crank pulley.
1) The crank pulley on the ATI 10 rib kit I bought is actually underdriven. I'm not sure why you would make a supercharger pulley kit in an underdrive configuration. It's only a 2.2% underdrive, but still....
2) With the crank pulley being slightly underdriven, you would think that the alternator pulley would be slightly overdriven. Nope. It's underdriven as well. Being forced to go back to e-fans because I'm losing the stock water pump pulley, I want as much idle voltage as possible to run the fans. Not too happy about this either.
3) Availability of 10 rib vs 8 rib belts. I should have thought about this before I ordered, but how difficult is it going to be to find a 10 rib serpentine belt long enough to work with the blower? Would it be easier to find an 8 rib belt in any given length?
Anyway, I'm looking at the possibility of sending the ATI pulley kit back, but I want to make sure that I'm not going to be kicking myself in the future for going with an 8 rib over a 10 rib setup.
I'm asking in regards to a TVS2300 front inlet rear drive, with cog drive in back, on a 403ci engine, looking to make 15-18 psi at the track.
If I ditch the ATI kit I'll order the Innovators West 8 rib kit with the overdrive crank pulley.
04-15-2009, 09:00 PM
#2
10 rib belts in the dimensions needed will be hard to find, we are running between 108" and 109" 8-rib belts. I do not believe there are any avail in those dimensions of the shelf.
Custom only.
Joe Over @ left coast has done a lot of the R&D for the 8-rib set-ups on our trucks.
give him a call.
Custom only.
Joe Over @ left coast has done a lot of the R&D for the 8-rib set-ups on our trucks.
give him a call.
04-15-2009, 09:24 PM
#5
I was a bit shocked that they made an under driven pulley in a 10 rib......Knowing that now, I think the 10 is going to get you there, but that is IT. The general rule of thumb is about 10-15 HP per rib is all the belts can handle. The blower at 15-16 psi is using about 130 HP. It is really your call, I know that Joe at Left Coast is running 15 psi on his 8 rib with no issues......yet. The 1-2% underdrive does not scare me, when I weigh the advantage of the 10 rib.
04-15-2009, 09:25 PM
#6
We have an 8 rib on my partner Hanks SSR and we are at 14 psi so far. We need more fuel before pushing the boost higher. His engine is a 9 to 1, L92, 427 with the TVS2300 Jackshaft Overdrive Cog in the rear. No issues at all out of the 8 rib so far. I have also run my TBSS up to 17.5 psi on my 8 rib Overdriven Jackshaft 122HH.
04-15-2009, 09:33 PM
#7
I was a bit shocked that they made an under driven pulley in a 10 rib......Knowing that now, I think the 10 is going to get you there, but that is IT. The general rule of thumb is about 10-15 HP per rib is all the belts can handle. The blower at 15-16 psi is using about 130 HP. It is really your call, I know that Joe at Left Coast is running 15 psi on his 8 rib with no issues......yet. The 1-2% underdrive does not scare me, when I weigh the advantage of the 10 rib.
We have an 8 rib on my partner Hanks SSR and we are at 14 psi so far. We need more fuel before pushing the boost higher. His engine is a 9 to 1, L92, 427 with the TVS2300 Jackshaft Overdrive Cog in the rear. No issues at all out of the 8 rib so far. I have also run my TBSS up to 17.5 psi on my 8 rib Overdriven Jackshaft 122HH.
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04-15-2009, 09:35 PM
#8
With the Smaller crank,alt,and w/pump pulley from ATI will put that belt out of the ballpark for our current pulley config.
Smaller the pulleys smaller the belts, Based on the discription of those ATI pulleys i would guess @ 106" belt.
Now A 10 rib stand alone would be Neet!
Smaller the pulleys smaller the belts, Based on the discription of those ATI pulleys i would guess @ 106" belt.
Now A 10 rib stand alone would be Neet!
04-15-2009, 09:38 PM
#9
ATI kit crank pulley is smaller, but alt is bigger. Water pump and P/S are nearly identical to stock, and I still have to do something about the idler since ATI didn't provide one. I would likely do the Metco 100mm idler. Not sure where that puts belt length. ATI tensioner pulley is smaller than stock too by a good amount.
04-15-2009, 09:39 PM
#10
We have not noticed any adverse wear effects from the 8 rib setup. The next question is easy, I have the 8 rib on my TrailBlazer SS at just over 16 psi with a 3.1" supercharger pulley. Hank's SSR is running a 3.2" supercharger pulley right now on his with 14 psi.