Looking for info to make 21 lbs on Kenne Bell.

blwn03sonic · Sep 23, 2018

I’m switching over to e85 with a fore kit. I currently have a Kenne Bell 2.8 with a 3 3/4 upper. I’m debating over getting a 4lb lower or getting a 3 1/4 pulley. I’m making about 15-16 lbs of boost with 3 3/4

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InvisibleBlade · Sep 23, 2018

When I had my 2.8KB, I made 21psi on a 3" upper only with full exhaust.

blwn03sonic · Sep 23, 2018

Okay. Thanks. I was going to get a 3.25 because it shows 22lbs on the kB chart.

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03' White Snake · Sep 23, 2018

I'm making 22 psi with my 2.8h KB, stock 3.75" upper with 4lb lower. That is on a higher than stock compression ratio motor though.

Same setup before, I was seeing 20.5 psi with headers, no cats.

GodStang · Sep 24, 2018

I prefer the 4lb lower than the smaller upper for added belt wrap. I was running something like a 3.25 upper and a 6lb lower. The 6lb lower helped with belt slip.

Stage 4.6 · Sep 24, 2018

Iam running a 3.75 with 4lb lower on my 2.6H and according to my dyno sheet Iam at 17psi that diagram says the 3.75 is good for 16psi?
Ive been itching to swap in my 3.5 pully but my tuner doesnt recommend it with 91oct fuel. Can i safely run a 3.5 with 91oct.

blwn03sonic · Sep 24, 2018

I’m going with a 4lb lower from Metco with the 3.75 upper we’ll see how much boost the kB makes in November.

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GodStang · Sep 25, 2018

Stage 4.6 said:
Iam running a 3.75 with 4lb lower on my 2.6H and according to my dyno sheet Iam at 17psi that diagram says the 3.75 is good for 16psi?
Ive been itching to swap in my 3.5 pully but my tuner doesnt recommend it with 91oct fuel. Can i safely run a 3.5 with 91oct.

On 91 octane I would not feel safe doing that either. I guess if they back way off timing you would be ok but you would most likely negate any power made. There is a fine line between what timing to run and what boost. You want a health amount of both to make the best combo.

Stage 4.6 · Sep 25, 2018

GodStang said:
On 91 octane I would not feel safe doing that either. I guess if they back way off timing you would be ok but you would most likely negate any power made. There is a fine line between what timing to run and what boost. You want a health amount of both to make the best combo.

Thank you sir! really appreciate the info. I guess my only future move at my elevation would be to convert to E85

blwn03sonic · Oct 2, 2018

Anybody know the belt size for a kB 3.75 upper and a 4lb lower with billet flow idlers.

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Stage 4.6 · Oct 3, 2018

blwn03sonic said:
Anybody know the belt size for a kB 3.75 upper and a 4lb lower with billet flow idlers.

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Ill double check but i believe i am running a Gates Green belt 81 1/8in belt with my set up, 3.75 upper 4lb lower along with 90mm idlers. I believe the METCO website has a belt diagram for the different set ups as well.

blwn03sonic · Oct 3, 2018

Stage 4.6 said:
Ill double check but i believe i am running a Gates Green belt 81 1/8in belt with my set up, 3.75 upper 4lb lower along with 90mm idlers. I believe the METCO website has a belt diagram for the different set ups as well.

Thanks. I’ll check their site.

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03' White Snake · Oct 3, 2018

Stage 4.6 said:
Ill double check but i believe i am running a Gates Green belt 81 1/8in belt with my set up, 3.75 upper 4lb lower along with 90mm idlers. I believe the METCO website has a belt diagram for the different set ups as well.

I am also running an 81" belt with mine. 3 100mm and 1 90 mm idler with the 100mm being a snub idler by the blower. Its tight but it clears.

GodStang · Oct 3, 2018

Be careful with a Gates belt on a Kenne Bell. I went through so many with them squealing like crazy. Switch to Gatorback/Continental and not an issue since.

03' White Snake · Oct 3, 2018

I also run Gatorback belts.

blwn03sonic · Oct 3, 2018

I’ve been using the green gates belt with no issues. I’ve used the gator back before and they always have a sound like a gear drive. But not that extreme. No complaints about the sounds either.

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lucheski · Oct 10, 2018

Im running a 2.8 mammoth, with cams/headers/168MM single blade KB throttle body

3.50/2lb 20psi
3.25/2lb 22psi
3.00/2lb 26psi <- belt slipping

blwn03sonic · Oct 10, 2018

lucheski said:
Im running a 2.8 mammoth, with cams/headers/168MM single blade KB throttle body

3.50/2lb 20psi
3.25/2lb 22psi
3.00/2lb 26psi <- belt slipping

So I have 3.75 upper and 4lb lower. Hopefully I see 20lbs of boost.

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Looking for info to make 21 lbs on Kenne Bell.

blwn03sonic

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InvisibleBlade

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03' White Snake

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