Hurricane 270 tune difference compared to 300 header tune?

[hpmaniac]

This has been an interesting subject and read for me. I didn't realize that I wasn't the only one having to raise the FP on my sled to 50+psi. My sled has a stock wastegate yet will build upwards towards 20 psi boost at WFO and I know that is not typical with a header so I thought that my FP requirements for safe AFRs was an anomaly. Looks like these Hurricane Header tuned 998s are really needing the fuel and we all know you need fuel for horsepower.
I really like the adjustable FPR as it is so easy to quickly adjust which I have used to gain fuel economy by reducing FP for slow trail riding where the closed loop is not always active and I know I am not going to be wide open on the 300 tune.
Again...for me...closed loop and data logging is essential on my sled and I would not tune above a stock muffler 240 tune sled without it.

Why not just send Dave at hurricane a data log and have home tweak the fueling in the tune? Keep in mind when the tune was developed on the machine he was working on may have had slight difference in fuel pressure, fuel flow, and a bunch of other variables that can cause the tune to vary sled to sled. Dave is awesome to deal with and I'm sure he would have no problem doing this.

 

[hpmaniac]

I think it happens at the last reduction in boost to bring down to the "300" level.
Header and 3" muffler is what tune is designed for so i don't get it. Up front i have the stock intercooler with the secondary intercooler under hood which is supposed to deliver more even air to all 3 cylinders. Turbo is all stock.
Found my fuel return line was getting pinched when seat flexes down just ahead of pump and messing with fuel pressure.

Might have to run an internal fuel line inside tank from original return location to the fuel pump slipper.

Did you log before and after the secondary intercooler? Very interested in the difference.