KB2.8 w/ Mammoth Pulley Combo=Boost

[jackers]

I've seen a bunch of threads for Eatons and different models of KB's and Whipples but I haven't seen anything with the KB2.8 blowers with Mammoth intakes.

Here is a link to KB's website showing the stock (7.5") and underdrive (6.55") crank pulley/upper pulley boost guide.
http://kennebell.net/KBWebsite/Common/pdfs/PulleyBoostRatioMAMMOTH_03cobra.pdf

I'd really like to see other upper/lower combos (like 3.25 upper/4# lower). Please post your pulley combos, the boost it made, and if you have cams/longtubes.

I'll try to keep this post updated.

GodStang - Stroker, Stage III cams, 1-7/8 Longtubes.
3.75"/6lb lower ~19.89
3.25"/6lb lower ~24.76

 

[GodStang]

3.75"/6lb lower ~19.89
3.25"/6lb lower ~24.76

 

[jackers]

3.75"/6lb lower ~19.89
3.25"/6lb lower ~24.76

Thanks!

 

[lucheski]

3.5"/2lb lower ~ 18psi

Stock Longblock with 1-3/4 Headers

 

[LS-WHAT]

KB- 3.75/ Metco +4lb lower 19.8lbs
KB-3.25/ Metco +10lb lower 27.88lbs

 

[TRBO VNM]

Bring that oil filter stem to work tomorrow so I can finish with the motor. Want it in the car next week hopefully. Need to mock up the KB and confirm fuel system design/fittings

 

[03' White Snake]

Non mammoth 2.8h here, 3.75" upper 2 lb lower, with Bassani Mid Length Headers, stock cams....... 19.7lbs

 

[vrt03cobra]

3.5"/2lb lower ~ 18psi

Stock Longblock with 1-3/4 Headers

Just Curious, the KB boost chart says a 3.5 upper with the stock lower is supposed to net 18psi. I just purchased a 2.8LC Mammoth and have the 3.5 on there, I have a 6.55 lower to get me 15psi for my street tune (91oct) by the looks of what boost people are actually making it's only going to pull 14psi???

 

[03' White Snake]

Headers reduce boost. I lost about a psi adding Bassani Mid Lengths to my car, but picked up 22 hp.

 

[ctgreddy]

stock longblock and stock ex manifolds here

3.65 upper/2lb lower makes 18-19.5lbs depending on weather and rpm.

Got a 3.4 upper to use when i go e85 very soon so will try and update the thread with that info.

 

[jackers]

Thanks everyone. I ordered a couple different sized pulleys from KB directly. No more ugly flat metal look, they finally sell them polished now.

Anyway, I'll be running the 6.55 underdrive for a while and have a number of different pulleys too. I do have 1 7/8" longtubes and an 4R70W trans but it should help add to the database.