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I pulled the turbo off last night and noticed the hole I had drilled in the turbo housing was not as large as the wastegate flange itself. I got the die grinder out and went to work opening it up to the same size with a nice taper. The housing material was pretty soft and it didn't take long. Sorry I didn't get any before pics but I probably opened it up a 1/4 inch all the way around. The position on the housing could be better but it is definitely not at a 90 degree angle. I am going to put it back on and test it with a 5 1/2 lb spring. If it still creeps I guess I will just have to add another wastegate.
Here is a pic looking straight into the housing and I can clearly see the flange opening.
And one from the other side. It sure seems like this would work?
It has been months since I even had time to think about the Mailbu. I am getting freed up and want to go back to tuning this time on e85. Having just an in tank Walbro 450 and 80 lb injectors which would be better (add a AEM 380 in line pump and raise the fuel pressure or swap to 210lb injectors). I am not sure how far I can go with my current combo but really would like to get 600 to the tires on e85.
I have ran as fast as 10 flat with one 380 on e85 with 80# injectors.
now I run 2 and have ran 9.85 at 17 psi boost on e85 with 80#dekas.in my 3500 lb nova.
the deka's will go a long ways if the pump pressure is good. my buddys Camaro has ran 9.17 at 147 mph at 3550 lb on deka 80# and 23 psi boost running a microsquirt. 55 psi base 1 to 1 rise in pressure but he is out of injector at that point. he runs the eliminator black pump
I ended up putting a second Walbro 450 pump in my stock fuel tank and switched to Bosch 210 lb injectors. Tuning it myself mostly using the self tuning feature build in to Tuner Studio, and the data logger. With the ethanol content reading 70% I loaded a more aggressive timing table and headed back to the dyno to make some more pulls. The reward was 675 HP to the tire at 18lbs of boost. There may have been a little more left but I didn't want to push any further with unknown ring gaps and a boost controller that was not acting very linear. I have more that surpassed my original HP goal of 600rwp and have a really fun to drive street car.
One very interesting thing the dyno showed was no power difference for my 3 inch loud valve manually held open vs opening on it's own. When the valve is closed all of the exhaust goes from a 3 1/2 inch downpipe that necks down to a 2 1/2 super turbo muffler just before the rear bumper. Just cruising around this car is really quiet.
07-24-2017, 10:31 PM
