Winter project.
03-02-12, 05:03 PM
#77
Found a huge pressure leak at the TB elbow this morning. I ordered new o-ring for the TB. It will not be in until Monday, so I put rtv on the elbow and will let it set up and then test the rest of the intake track. It looks like the powder coating caused imperfections on the mating surfaces. I may have to take it all apart again to get all mating surfaces machined flat. I think the coolant sensor wire connection is not seated good or pin pushed out a little. Easy fix I hope.
03-19-12, 05:36 PM
#82
Still leaking. The car idles great with a low vacuum 12in. no miss fires, when going into boost only makes around 5-6psi. When I pressurize the intake with a pressure tester set to 5 psi, I hear a leak around the TB. I can feel the leak with my hand around the mounting nut for the greddy elbow to TB area. I'll keep looking.
03-26-12, 02:24 PM
#85
I smoke tested intake and the only leak I could find was some stupid vent for the double throttle plate shaft on the fire wall side of the TB. Ive been chasing this leak and thought it was the greddy elbow to TB the whole time and it was this stubid leak that mazda made there. Back to square one.
04-01-12, 02:01 PM
#90
I have to take her apart again. Those coolant ports on the lim are leaking internally and externally. I so done with those ports, they are getting deleted with 20mm freeze plug and I will tee off the rear iron to send coolant to the turbo. Im getting the powder coatings removed from all mating surfaces by a machine shop to eliminate all vacuum leaks. I dont plan on doing this until after the next DFW Rx7 meet. Come out and see it bofore it goes under the knife again. 302 was other winter project, sorry if I scared ya'll.
04-25-13, 10:04 AM
#91
Long overdue update. All oil and water leaks are fixed on the turbo. I found better o-rings for the LIM coolant ports. The oil return line I got from Himni racing failed (cooked and cracked), so I put the stock one back on. The turbo is still giving me boost issues, wastegate opening issue. I added a helper spring and so far so good. Hope to see ya'll soon.
06-18-13, 04:35 PM
#92
Well, all is good. I took the 7 up to Rotary Performance and tested it on the dyno. No boost leaks and wastegate is holding 10psi all the way to redline. It put down 271.9 Hp at 10psi 7000 rpm, AFR's were high 10's low 11's. I wanted to up the boost to 12, but Chris talked me out of it, due to the engine is still untouched from the factory. Once I feel like rebuilding it, I will push it up to 14psi. Cheers
06-19-13, 06:31 PM
#93
Well, all is good. I took the 7 up to Rotary Performance and tested it on the dyno. No boost leaks and wastegate is holding 10psi all the way to redline. It put down 271.9 Hp at 10psi 7000 rpm, AFR's were high 10's low 11's. I wanted to up the boost to 12, but Chris talked me out of it, due to the engine is still untouched from the factory. Once I feel like rebuilding it, I will push it up to 14psi. Cheers
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