The good news is that we found the end of the fuel system running e85. For sure the fuel rail pressure and the hpfp were humming along but when I bumped to 14psi with e70 (pump e85), the injectors hit their limit. In a run yesterday we saw 7.5ms on the injectors.
That brings me to the real point of this post. Trying to run 14psi on my street tires with cooling weather is not doable. In fact, it's downright scary!
In the past, I would get into 4th gear on the on-ramp slow down until I hit the straight away and then hammer it. It would let me log a good run to 6500RPM's. It was a little tricky before, but upping to 14psi...forget it. I was in 4th gear and anything below say 80mph would just spin the tires...not even a hint like it was going to catch hold. It was ridiculous.
I was on the same stretch of highway that I used for all of my runs, so while it might not have been the best, it has worked.
Bottom line is, I am done for the year. I am going to switch the pulley back to the 85mm pulley (8psi) which will be the 705whp/830hp setup. Once I get my new tires and the weather warms up, I will resume testing to figure out which boost level is best for the street. Once I can get to the track, we will resume the testing with the 14-15psi pulley and race fuel.
Recap:
85mm - 8psi - 700whp
80mm - 10psi - 730whp
75mm - 12psi - 760whp
70mm - ?? - couldn't finish testing
I think we could have played around with the 75mm pulley and gotten a higher number if we wanted to play with the dyno. We didn't force the converter to lock early and on the dyno we were seeing 1 degree of timing less than on the street. I am really confident we could have gotten 780-800whp at 12psi if we just wanted to get the dyno number. However it was driving so great and on the street runs the numbers look so good that we decided not to mess with it until we can get to the track.
Most likely, once I get better tires, I will return to the 12psi setup running pump e85. I think that setup might be good enough to run exactly the same on the street or dip into the 9's on the strip.
If I fall short of the 9's with my street setup, I will have one more lever to get over the hump and with 14-15psi, we will definitely get there.
I will be moving to the cosmetic section for the winter.
