turbowop
Well-known member
Drove the 180 miles to English Racing today for a dyno tune on ECMlink for pump and pump/meth. So on the way to English, the car seemed to be running hot when I got held up in some road construction. I just replaced an OE 190 thermostat that was stuck open with a brand new OE 190. I think this one doesn't like to open correctly because if the car sits in traffic it jumps up to like 213-216. Never had an issue like this before. Anyway, I made it there without any other issues.
On the dyno, we realized something was up with the meth system wiring. Anybody that has seen my methanol wiring thread in the tech section may be able to follow along with this. The 10psi Hobbs switch was activating the secondary fuel maps for some reason. All this ground switch crap really messed things up. The wiring was sound, but somehow the ECU input would see ground with that Hobbs switch and the 60psi Hobbs would flow ground through it without seeing 60psi. We think it was pulling ground through the 2-stage MBC or the meth "on" led. So I had to hack up all my nice wiring to fix it. Ended up having to wire in a second relay so everything is switched on by 12v, but the second relay reverses the polarity right before it goes to the ECU so that it see a ground to switch maps. What a complicated mess.
Finally fixed, Lucas started making some pulls. Remember, my car still has a stock 7.8:1 bottom end with 140k miles on it. I think it's getting tired. Other mods can be seen in the link in my sig if anybody doesn't know what the car has in it.
Pump gas 23psi did 357whp and pump/meth at 27ish psi did 424whp. Any more substantial boost or timing and the car would knock, so we left it there for safety. On the street, the power with pump/meth comes on nice and smooth.
I expected more power, but I guess I should be more realistic about my goals unless I plan to build something fresh with higher compression. Everything else is there, so I can't think of anything else that would change it. It was running a tad hot during some of the pulls and Lucas thinks swapping out that thermostat will actually help make a few more ponies. I'll probably replace it this weekend and clean up my wiring that I had to fix. Other than that, I'm just going to enjoy the car again. /ubbthreads/images/graemlins/smile.gif
This dyno graph shows pump gas run in red and pump/meth in blue:
On the dyno, we realized something was up with the meth system wiring. Anybody that has seen my methanol wiring thread in the tech section may be able to follow along with this. The 10psi Hobbs switch was activating the secondary fuel maps for some reason. All this ground switch crap really messed things up. The wiring was sound, but somehow the ECU input would see ground with that Hobbs switch and the 60psi Hobbs would flow ground through it without seeing 60psi. We think it was pulling ground through the 2-stage MBC or the meth "on" led. So I had to hack up all my nice wiring to fix it. Ended up having to wire in a second relay so everything is switched on by 12v, but the second relay reverses the polarity right before it goes to the ECU so that it see a ground to switch maps. What a complicated mess.
Finally fixed, Lucas started making some pulls. Remember, my car still has a stock 7.8:1 bottom end with 140k miles on it. I think it's getting tired. Other mods can be seen in the link in my sig if anybody doesn't know what the car has in it.
Pump gas 23psi did 357whp and pump/meth at 27ish psi did 424whp. Any more substantial boost or timing and the car would knock, so we left it there for safety. On the street, the power with pump/meth comes on nice and smooth.
I expected more power, but I guess I should be more realistic about my goals unless I plan to build something fresh with higher compression. Everything else is there, so I can't think of anything else that would change it. It was running a tad hot during some of the pulls and Lucas thinks swapping out that thermostat will actually help make a few more ponies. I'll probably replace it this weekend and clean up my wiring that I had to fix. Other than that, I'm just going to enjoy the car again. /ubbthreads/images/graemlins/smile.gif
This dyno graph shows pump gas run in red and pump/meth in blue: