[Tim M]

First piece of the puzzle...talk about a work of art - Nick Williams 103 mm product:

[EDFHOBBIES]

That's a baby

[Tim M]

First WOT log returned ~9.8 psi with the slower blower (2.7 inch upper). Looks promising...

[JSH]

Originally Posted by Tim M

Greetings.

Have an interesting combination.

I installed an LT4 blower on my LT1, but find a bit too much boost for the octane here in Germany. I end up using octane booster for those 'high stress' situations.

I'd like to get away from that requirement - so shipped my 7000 mile OEM LT4 blower to have a 'larger' pulley (2.7) installed along with a full internal porting. Will also be adding a 103 MM throttle body to the mix.

The hope is slightly less boost, but a reduction in restriction to make some of the power back.

This likely won't be the last combination so an intermediate step at least for this upcoming season.

Bad idea?

Note: German restrictions for inspections and checkpoints dictate a stock appearing car...

Thanks.

There are so many upper and lower pullies available that you should be able to get the boost you want

[Tim M]

I only changed the upper and it was a custom 2.7. Rather not have to buy another not to mention the tune!