Jazzmeson's MazdaManiac Greddy Turbo Kit
10-10-2016, 08:28 PM
#29
SARX Legend
iTrader: (46)
Yeah man, I bet it's not a leak. I went thru several intake setups and each one required me to scale the MAF for each one. The MAF scaling being off can cause all kinds of wired issues.
10-11-2016, 11:05 AM
#30
Administrator
iTrader: (7)
Jaemeson; stop breaking ****! 
10-25-2016, 01:33 PM
#33
Tuning is delayed yet again. I attempted a 3rd gear WOT with stable AFRs, but experienced a bad boost spike from just under 6 PSI creeping past 8 to who knows where... I'm using a 7 PSI wastegate actuator, so I'll have to check and see if it's having trouble opening. This occurred past around 6300 RPM approaching towards 7K RPM. The car definitely wasn't happy and it seemed like I hit fuel cut and tons of smoke came out the rear. Not to mention a loud crackle when it occurred, most likely detonation. Motor is fine though, drove it casually with vacuum sitting at 850-900 RPM/16.2-16.8 Hg at 1,500 ft altitude.
Last edited by Jazzmeson; 10-25-2016 at 01:36 PM.
10-25-2016, 02:00 PM
#35
No flashing CEL when it occurred. All codes are just typical catalyst and air pump codes which were all removed. Me and gregs tested the actuator before install and was moving freely, but we'll have to do a double take and see if it's having trouble opening as it sits.
10-25-2016, 02:33 PM
#36
SARX Legend
iTrader: (46)
My bet is that you just need to mess with the boost controller some more. Mine took forever to get dialed in and I am always improving on it's setup. Also, check the boost cut feature. On mine (HKS EVC-S) I had to mess with the percentage that it cuts boost when it hits the set limit. If the percentage was too high it would cut boost too much and abruptly.
10-25-2016, 02:44 PM
#37
10-25-2016, 09:39 PM
#38
We're actually relying on the wastegate spring for the meantime since the controller hasn't been plumbed yet; it's set at 5 PSI. We ruled out the actuator and the wastegate itself, they have no trouble opening after testing again earlier. I gave it another WOT in 3rd with the WG tied open this time and it's still overboosting approaching past about 6 PSI once it hits close to 6000 RPM. Backed out right away since it creeps up so quickly...
10-25-2016, 10:22 PM
#39
Hybrid Greddy Boosted
My setup is/has been very similar to yours, and mine behaves as follows: With my WGA spring measured at 9psi, I was seeing no more than 7psi of boost (exhaust back pressure blows the WG open). With the WG unlatched and swinging freely, I saw no more than 4psi, and this was a very predictable linear increase in pressure, only seeing 4psi near redline.
It sounds like the exhaust flow through the turbine housing and out of the wastegate is severely restricted. Have you got any pics of the hot-side outlet of the turbo showing the wastegate flap and how far it can open?
Also, I mentioned previously about the inlet to the turbine housing from the exhaust manifold. It possible (though probably not that likely) that this area is causing excessive backpressure, which may be contributing to your issues. Do you have any pictures showing how rough/smooth that area is?
It sounds like the exhaust flow through the turbine housing and out of the wastegate is severely restricted. Have you got any pics of the hot-side outlet of the turbo showing the wastegate flap and how far it can open?
Also, I mentioned previously about the inlet to the turbine housing from the exhaust manifold. It possible (though probably not that likely) that this area is causing excessive backpressure, which may be contributing to your issues. Do you have any pictures showing how rough/smooth that area is?
10-25-2016, 10:51 PM
#40
My setup is/has been very similar to yours, and mine behaves as follows: With my WGA spring measured at 9psi, I was seeing no more than 7psi of boost (exhaust back pressure blows the WG open). With the WG unlatched and swinging freely, I saw no more than 4psi, and this was a very predictable linear increase in pressure, only seeing 4psi near redline.
It sounds like the exhaust flow through the turbine housing and out of the wastegate is severely restricted. Have you got any pics of the hot-side outlet of the turbo showing the wastegate flap and how far it can open?
Also, I mentioned previously about the inlet to the turbine housing from the exhaust manifold. It possible (though probably not that likely) that this area is causing excessive backpressure, which may be contributing to your issues. Do you have any pictures showing how rough/smooth that area is?
It sounds like the exhaust flow through the turbine housing and out of the wastegate is severely restricted. Have you got any pics of the hot-side outlet of the turbo showing the wastegate flap and how far it can open?
Also, I mentioned previously about the inlet to the turbine housing from the exhaust manifold. It possible (though probably not that likely) that this area is causing excessive backpressure, which may be contributing to your issues. Do you have any pictures showing how rough/smooth that area is?
10-26-2016, 03:29 PM
#43
Looks like the turbo has to come off. We're still having problems controlling boost pressure. Hitting 9 PSI by 5700 RPM with the wastegate left open! Who knows how high it crept up past that when I was hitting close to 7K... Once it's taken apart, I'm going to enlargen the port significantly and look for any other possible restrictions. Unfortunately, this is a problem beyond what a boost controller can fix...
10-26-2016, 04:14 PM
#49
SARX Legend
iTrader: (46)
I developed the SARX Greddy wastegate actuator with ATP, they were excellent to deal with in sending a spare Greddy to them and going back and forth with changes to the design, etc. I'd be surprised if they screwed up the rebuild.