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Title: Boost issue- need confirmation of my diagnosis Post by: Bugman100 on May 27, 2019, 12:35:20 PM I have a BJX 150BHP engine that i have transferred to a MK1 Caddy. The ecu tune has had SAI and Rear 02 deleted (along with a cat removed).
LDRXN has been tweaked slightly upping the boost by 1 PSI and holding onto boost further up the rev range. The engine runs and drives well but is not reaching the desired boost with wastegate duty pegged at 85-95% log file and chart attached. i think its one or more of the below is at fault Boost leak. Failing wastegate actuator. Failing boost valve. Is there anything else I have missed or nuggets of wisdom before i go down the proverbial rabbit hole looking for mechanical faults? Nigel Title: Re: Boost issue- need confirmation of my diagnosis Post by: nyet on May 27, 2019, 12:43:41 PM That's literally wg pressure.
Title: Re: Boost issue- need confirmation of my diagnosis Post by: Bugman100 on May 27, 2019, 12:57:52 PM Im relatively new to this please could you explain. Am i looking at the wrong thing?
Title: Re: Boost issue- need confirmation of my diagnosis Post by: aef on May 28, 2019, 05:53:24 AM It means your car does not use the N75. Your turbo will create only base boost by using the spring rate in your waste gate actuator.
pressure test your system after a swap is never a bad idea. check n75, wiring to n75 and piping of n75. Title: Re: Boost issue- need confirmation of my diagnosis Post by: Bugman100 on May 29, 2019, 02:59:23 AM Thanks, that's what I needed.
Sort of got to that point last night, unplugged the n75 and got the same results as before. I tested for boost leaks last night, that all turned out good. I do have a small concern about the diverter valve leaking at higher pressures. something to watch as I creep the boost levels up. I reviewed my notes on my wiring conversion this morning so will check wiring tonight, along with the other things you have mentioned. Thanks for the response, I will post my findings later. Title: Re: Boost issue- need confirmation of my diagnosis Post by: Bugman100 on June 03, 2019, 12:42:32 PM Ok my boost issue is fixed.
The N75 valve was incorrectly fitted. Boost now following LDRXN Thanks all Title: Re: Boost issue- need confirmation of my diagnosis Post by: nyet on June 03, 2019, 03:09:23 PM NP, thanks for the update. Always appreciate it when people come back to add info, it is always helpful for everyone.
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