Bellato Donating Members 2,713 Member For: 14y 1m 2d Posted 05/12/15 06:23 AM Share Posted 05/12/15 06:23 AM I've noticed the last couple of weeks my car won't make the full 16.5psi its tuned to but only makes 13.5 when data logging it. It's a constant boost level right through the rev range, like its only making gate pressure (14psi external gate).I recently went over everything, service, plugs, fuel filter, fresh tank of fuel with injector cleaner run through, new vacuum line to the gate. I think its probably a wastegate or boost solenoid issue but without replacing them im not sure. Anyone have any ideas?My tuner is in Sydney and Im in Canberra so just trying to check everything before I go up and have them look at itCheers Link to comment Share on other sites More sharing options...
barnz Member 3,047 Member For: 11y 1d Gender: Male Location: Brisbane Posted 05/12/15 06:38 AM Share Posted 05/12/15 06:38 AM Bypass the solenoid see if it makes any difference.Not sure how to diagnose an external gate sorry. Link to comment Share on other sites More sharing options...
JETURBO ...JD TUNING ADELAIDE... Gold Donating Members 23,708 Member For: 16y 5m 21d Gender: Male Location: Adelaide Posted 05/12/15 06:50 AM Share Posted 05/12/15 06:50 AM Did you ever data log the "tuned" 16.5psi in the same method that you just logged the 13.5psi with ? 1 Link to comment Share on other sites More sharing options...
Bellato Donating Members 2,713 Member For: 14y 1m 2d Posted 05/12/15 09:12 PM Author Share Posted 05/12/15 09:12 PM Won't bypassing the solenoid just make it run gate pressure? Nope never did so I cant compare what the previous tune looked like on my data logger. The only reason I data logged at the moment is cause I raced a car I can mormally keep up with and got chopped big time, plus it barely spins first now and use to be able to roll on in 2nd and just bake tyres Link to comment Share on other sites More sharing options...
JETURBO ...JD TUNING ADELAIDE... Gold Donating Members 23,708 Member For: 16y 5m 21d Gender: Male Location: Adelaide Posted 06/12/15 12:27 AM Share Posted 06/12/15 12:27 AM For a big variation like that you would typically look for the vac line on the external gate to be damaged but you said you have already checked it Log wastegate D/C and see if the ECU is still commanding the actual amounts tuned to You won't know what they are but for gate pressure only tune it will be 0.000 everywhere where as higher than gate pressure will require some DC ( say 0.300's or the like ) If the ecu is commanding it, the vac line is good, then you have an issue starting with the gate and downwards through the exhaust system It's possible the diaphragm/seal in the gate could be suspect Link to comment Share on other sites More sharing options...
velocityxr6t Member 122 Member For: 16y 8d Gender: Male Posted 06/12/15 02:06 AM Share Posted 06/12/15 02:06 AM If it's commanding correctly but only making gate pressure I'd be suss on the solenoid being stuck open. Bypass it and if it still runs 13.5 psi the solenoid ain't doing sh*t. I assume the solenoid should be closed when off? Try blowing through it to check for a leak.I wouldn't think a damaged gate diaphragm would cause less boost. It'd cause overboosting as now you have a leak so it takes more pressure to overcome the leak + spring pressure. If the spring has gone slack however.... But, IMO, making that close to the advertised 14psi gate pressure, I wouldn't immediately suspect the gate. Though it is possible it's unlikely to have failed just enough to run exactly gate pressure while more is commanded. 1 Link to comment Share on other sites More sharing options...
barnz Member 3,047 Member For: 11y 1d Gender: Male Location: Brisbane Posted 06/12/15 04:01 AM Share Posted 06/12/15 04:01 AM (edited) Won't bypassing the solenoid just make it run gate pressure? Exactly, u said it just felt like gate pressure atm...so if its no different bypassed, and was commanding correctly....If it's commanding correctly but only making gate pressure I'd be suss on the solenoid being stuck open. Bypass it and if it still runs 13.5 psi the solenoid ain't doing sh*t. I assume the solenoid should be closed when off? Try blowing through it to check for a leak. Edited 06/12/15 04:02 AM by barnz Link to comment Share on other sites More sharing options...
Bellato Donating Members 2,713 Member For: 14y 1m 2d Posted 06/12/15 10:57 AM Author Share Posted 06/12/15 10:57 AM Thanks for the help so far guys.Tried a new solenoid today to no avail. However, put a brand new gate on it and things changed dramatically. Running the new gate bypassing the solenoid made it run perfectly on 14psi gate pressure (I forgot to try the previous wastegate with bypassing the solenoid to see). Then hooked it up properly to the solenoid and it was making over 20psi and so pulled out, this is at about 40% throttle. My mate was thinking that the original gate might not have a 14psi spring so my tuner used the duty cycle to try get 16.5psi out of it. Pulled apart the gate and found that the outer spring doesn't match any of the outer springs Turbosmart seller so thinking potentially a fake gate or the retailer has put a different brand spring in it. The seal on the diaphragm is also not sealing correct and has crease where it has popped off in the past. The gate has also gone completely bronze (was black) and now sure if its been overheated in its current location or they all do that?So next step is to ring the retailer in the morning and find out what would be the go with warranty and go from there Link to comment Share on other sites More sharing options...
JETURBO ...JD TUNING ADELAIDE... Gold Donating Members 23,708 Member For: 16y 5m 21d Gender: Male Location: Adelaide Posted 06/12/15 08:45 PM Share Posted 06/12/15 08:45 PM You're welcome Link to comment Share on other sites More sharing options...
eff xr6t Member 569 Member For: 11y 1m 22d Posted 07/12/15 10:01 AM Share Posted 07/12/15 10:01 AM They all go bronze from the heat mine was black now it's almost yellow from glowing red that many times. What brand gate was it? Link to comment Share on other sites More sharing options...
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