N13 Turbo - Round 2... Fight!

Converting To Delco ECU From Carby Or Other Injection Systems
Site Admin
User avatar
Posts: 7247
Joined: Sat Feb 28, 2009 8:34 pm

Re: N13 Turbo - Round 2... Fight!

Postby antus » Tue Jul 19, 2022 11:34 am

kph and rpm are in the first graph, no spike. Im wondering if there is anything else that could affect it, like air going to the wrong place until something is full, brake booster, or something like that. The map sensor should be trustable, so the question is why the turbo drops pressure at that point, or where the air might be going that could reduce pressure at that point. The sample rate on the dyno looks slower and rounded compared to the ecm. Loosing 40kpa over half a second, then back again in the next half a second. Is there any kind of pcv or similar that might open when it shouldnt when boost hits that point?
Have you read the FAQ? For lots of information and links to significant threads see here: viewtopic.php?f=7&t=1396

Posts: 368
Joined: Fri Mar 04, 2016 10:35 am
Location: Windellama, NSW

Re: N13 Turbo - Round 2... Fight!

Postby BennVenn » Wed Jul 20, 2022 8:09 am

The only valve in the intake path is the brake booster. It's probably worth plugging it on the dyno for testing. One less variable. What is more interesting is that in steady state at 4000rpm the boost oscillates between those two points.

I'm thinking that maybe the head is lifting and leaking between adjacent cylinders. This could explain the loss of boost pressure (less exhaust energy) and no change to AFR's or VE while it happens. The simpler explanation could be the wastegate arm is binding up as the turbo heats up. I'm not sure on a way to verify this

User avatar
Posts: 559
Joined: Thu Sep 17, 2009 2:00 pm
Location: Perth, WA

Re: N13 Turbo - Round 2... Fight!

Postby charlay86 » Wed Jul 20, 2022 9:52 am

I'm assuming you have actually observed the motor when this happens? No hoses in front of turbo collapsing?
Definitely do an intake boost leak test. Plug up the intake with a pvc pipe cap or something and stick some compressed air into the manifold via the fuel reg reference hose. Get out the soapy water if she leaks...

Site Admin
User avatar
Posts: 7247
Joined: Sat Feb 28, 2009 8:34 pm

Re: N13 Turbo - Round 2... Fight!

Postby antus » Wed Jul 20, 2022 2:17 pm

Its possible it could be something to do with the wastegate too.
Have you read the FAQ? For lots of information and links to significant threads see here: viewtopic.php?f=7&t=1396

Posts: 368
Joined: Fri Mar 04, 2016 10:35 am
Location: Windellama, NSW

Re: N13 Turbo - Round 2... Fight!

Postby BennVenn » Fri Jul 22, 2022 3:05 pm

Charlay86, haven't seen the motor when this happens but there's nothing flexible on the turbo inlet, just a 3" flex pipe with steel coil inside up to a pod filter. I'll grab some plumbing this weekend and pressure test it.

I think it's going to end up being wastegate related...

Posts: 368
Joined: Fri Mar 04, 2016 10:35 am
Location: Windellama, NSW

Re: N13 Turbo - Round 2... Fight!

Postby BennVenn » Fri Jul 22, 2022 3:22 pm

Holden202T, finished up my ALDL LCD.

Primarily to replace my broken dash temp gauge, it shows temp when off boost and will show boost pressure when positive MAP is read. Using Mode1 Message 0 so most values are easily accessible. Should work fine while tunerpro logging and I could always add an SD socket for logging without the laptop. Ideal for boost control too.

I'll probably get a few pcb's made up for these, and maybe a couple for the larger 3.5" IPS panels. Let me know if you're interested in one and I'll get extras made up. I'll release the source too so you can mix it up though you can just connect a USB cable to it and it'll give you a config text file that you can adjust (not yet implemented but the framework is there)

https://www.youtube.com/watch?v=0AJSLYTQKBs

User avatar
Posts: 10271
Joined: Sat Feb 28, 2009 9:05 pm
Location: Tenambit, NSW

Re: N13 Turbo - Round 2... Fight!

Postby Holden202T » Mon Jul 25, 2022 12:05 pm

yeah i'd love to give one a try!

Previous

Return to Delco ECU Conversions

Who is online

Users browsing this forum: No registered users and 4 guests