Jacob_Royer
SCCoA Member
Last year power was up a little from when Dave initially (279rwhp/12.70@107.7)tuned the car but still was not where i wanted it to be:
This year i upgraded to the Magnum powers abradive rotor pack and went from 33% od to 25% od. Also discovered a crack in the MPX case and it had trashed the last set of rotors and beat up the inside of the case pretty bad so i replaced it with a fresh mpIII Boost was still low IMO 12/13psi which was the same i saw with GTP rotors and 33% od. The other day i discovered a large crack in the back of my raised top! I had taken this off a parts car and just threw it on when i put the 4.2 in two years ago. I threw a stock top back on and instantly went to 16psi! The car felt much better but the tune was lean above 2.9v vmaf. After some runs and adding fuel i had it back into the realm of being safe. Saturday i took the car to Blakenship tuning for their annual spring dyno day. Here are the results! Note: This is a mustang dyno not a Dynojet like what i had the car on at the shootout so gains are likely alot higher.
Lee Blakenship told me that i am blowing through the converter pretty badly and highly recomended re-stalling it so i am going to try to do that this year. The stall speed is 3500+ now where it was originally meant to be 2800rpm! the converter was built for a very mild 3.8 and has always stalled higher with the 4.2 but now its kinda silly on stall speed. The car feels alot better than it ever did and i hope be in the lower 12s this year
This year i upgraded to the Magnum powers abradive rotor pack and went from 33% od to 25% od. Also discovered a crack in the MPX case and it had trashed the last set of rotors and beat up the inside of the case pretty bad so i replaced it with a fresh mpIII Boost was still low IMO 12/13psi which was the same i saw with GTP rotors and 33% od. The other day i discovered a large crack in the back of my raised top! I had taken this off a parts car and just threw it on when i put the 4.2 in two years ago. I threw a stock top back on and instantly went to 16psi! The car felt much better but the tune was lean above 2.9v vmaf. After some runs and adding fuel i had it back into the realm of being safe. Saturday i took the car to Blakenship tuning for their annual spring dyno day. Here are the results! Note: This is a mustang dyno not a Dynojet like what i had the car on at the shootout so gains are likely alot higher.
Lee Blakenship told me that i am blowing through the converter pretty badly and highly recomended re-stalling it so i am going to try to do that this year. The stall speed is 3500+ now where it was originally meant to be 2800rpm! the converter was built for a very mild 3.8 and has always stalled higher with the 4.2 but now its kinda silly on stall speed. The car feels alot better than it ever did and i hope be in the lower 12s this year