3.17 pulley swap

[Reillyrob]

Just asking if swapping a stock pulley on my Redeye for a 3.17 pulley would require a tune? Or is a tune necessary to get the full benefit from the added boost?

 

[DavidKFla]

Just asking if swapping a stock pulley on my Redeye for a 3.17 pulley would require a tune? Or is a tune necessary to get the full benefit from the added boost?

Some say that you can do it without a tune. I had a lower pulley put on mine and it ran horrible which is supposed to be the same. I don't know for sure.

 

[catdad]

My friend has a hellcat and he put on a 3.17 pulley without a tune, has a nice dyno graph but trapped at 120mph to my 126. My charger is all stock, ran a 10.9 in the heat he was 11.3- 11.5 range

 

[jonx96]

Take a look at this thread. The original post shows a picture of a 100% stock hellcat having knock on 93 as is.
https://www.hellcatforum.org/threads/is-racing-on-93-safe-not-really.10542/

 

[DavidKFla]

Take a look at this thread. The original post shows a picture of a 100% stock hellcat having knock on 93 as is.
https://www.hellcatforum.org/threads/is-racing-on-93-safe-not-really.10542/

There's a real change in performance and in overall engine temperatures when using 100 octane.

 

[jonx96]

There's a real change in performance and in overall engine temperatures when using 100 octane.

100 octane that's weak sauce I run 112 octane

 

[DavidKFla]

100 octane that's weak sauce I run 112 octane

Mines not tuned to within an inch of its life like yours.

 

[jonx96]

Mines not tuned to within an inch of its life like yours.

Hmm well I guess you didn't know that when E85 when knocks it is a lot more harmless than race fuel or pump gas
Also the e85 I run is 112 octane and not the 105 octane from the pump. I can run the same timing table on both but I just feel safer running the 112 especially when racing. On a tune I've spent 100 hours of research on.
I know exactly what is going on with the tune in my car I also know exactly what to look for in a log to know if there is an issue. Changing things based on weather.
Can you say the same? Do you log your car?

 

[DavidKFla]

Hmm well I guess you didn't know that when E85 when knocks it is a lot more harmless than race fuel or pump gas
Also the e85 I run is 112 octane and not the 105 octane from the pump. I can run the same timing table on both but I just feel safer running the 112 especially when racing. On a tune I've spent 100 hours of research on.
I know exactly what is going on with the tune in my car I also know exactly what to look for in a log to know if there is an issue. Changing things based on weather.
Can you say the same? Do you log your car?

I have a tuner who looks at my data and makes adjustments as needed.
I looked at E85 but it's hard to get around here and it would go bad, in a drum, before I used it all. This from my race fuel guy.