Thread: Stick with 2.7� pulley on Gen V or pulley up?

I am trying to make a decision if I should keep the 2.7� Pulley on my Gen V or pulley up to a 2.8�?

When I changed from my old gen III with a 2.7� pulley over to a gen V my original plan was to start with a 3.0� pulley. However with my new belt wrap system, the 2.7� Pulley was only pulley I could run with the belt I had on hand. I also don’t have a 2.8 or 2.9 pulley to work with.

However I feel the 2.7� pulley maybe too small of a pulley to run with the expectations I am trying to get out of my tune.

I am currently running 11.8 AFR with 17* to 23* timing at WOT on 93 octane. I am seeing around 13.0 to 14.5 PSI at WOT (according to the stock boost gauge).

My goal was to keep the AFR at 11.8+ and have my WOT timing no less than 18*.

However as soon as my car goes into 3rd gear I start to get KR and that is why I had to lower the 3rd gear RPM timing down to 17*. If not, I get KR no matter what. I actually still see blips of KR at WOT, however its normally like 0.2 at the most.

This is the reason why I feel the 2.7 just maybe is too much for my setup on pump gas?

SO do you guys think I should keep the car as-is or get a 2.8� pulley?

Ideally with the 2.8� pulley I will be able to run my constant 11.8 AFR and 18*+ WOT timing.

If anyone has a 2.8� pulley I would like to buy or trade with a 2.55 and 3.0 pulley I have left over.

You can look at my signature below for what mods I am running.

I would say you are fine on the 2.7 17* of timing. The difference between the 2.7 and 2.8 is extremely small.