1.6 M45 - lose a boost coupling and the engine revs out of control
I doubt this is a 'new' problem, but I can't find info about it.
I've got an M45/JRSC and MS2. Recently installed the MS2 and working on tuning it. I was out running the car last night and the coupling right at the S/C outlet blew off. I didn't know that right away but did after I inspected the engine bay. What I did find was that, if I ran the engine, it would rev. I'd cut the ignition before anything really happened, but I believe it would rev right past the limiter and blow the engine. :crx: I'm wondering if it's related to the throttle body being before the S/C. I have lost this coupling before with the stock ECU, but the engine would stumble and not run as opposed to this. I now have a T-bolt clamp on that coupling... Any advice? Is there a parameter in MS that I can/should adjust for this? |
Engage your brain. You have a massive leak after the throttling device yes it will be like having a wide open throttle.
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And there's no way it would rev past the limiter, that's defined by your ECU. As leafy said, think about it.
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Originally Posted by Leafy
(Post 985413)
Engage your brain. You have a massive leak after the throttling device yes it will be like having a wide open throttle.
Originally Posted by richyvrlimited
(Post 985415)
And there's no way it would rev past the limiter, that's defined by your ECU. As leafy said, think about it.
Could it not be reacting fast enough? |
Originally Posted by mc85
(Post 985420)
Sorry, I didn't mean to say I was concerned about the engine revving. I understand that it's like having the throttle completely open.
The problem is that the rev limiter does NOT appear to be working. I have it set at 7100 RPM. From what I could see on the tachometer and hear from the engine, it blew right past it before I cut the ignition. Could it not be reacting fast enough? I'm massively impressed you can tell engine RPM by ear too :rly: |
Originally Posted by mc85
(Post 985420)
Sorry, I didn't mean to say I was concerned about the engine revving. I understand that it's like having the throttle completely open.
The problem is that the rev limiter does NOT appear to be working. I have it set at 7100 RPM. From what I could see on the tachometer and hear from the engine, it blew right past it before I cut the ignition. Could it not be reacting fast enough? a 7100 limiter will look like ~8200 on your gauge cluster, because cheapcar. |
Originally Posted by richyvrlimited
(Post 985427)
Tacho on your laptop as reported by your ECU, or the tacho on your dash which is notoriously inaccurate and massively over-reads?
I'm massively impressed you can tell engine RPM by ear too :rly:
Originally Posted by Braineack
(Post 985429)
a 7100 limiter will look like ~8200 on your gauge cluster, because cheapcar.
There is no reason why the rev limiter would not have worked? |
I may know from a reliable source that a freshly built "stock" 1.6 will collapse new lifters at around 8400 rpm if you accidentally leave the rev limit at 15,000 RPM and go auto-x. So you didnt make it above that.
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Thank you and your reliable source.
Thanks guys for the advice this morning. I will assume that the tachometer was way off if 8400RPM would have meant engine failure. I can understand that having the engine running WOT with basically no restriction could cause the tachometer to sweep too fast. Almost seemed too fast for TS to even register it. I would be tempted to disconnect the coupling and make sure it hits the rev limiter, but probably not. It sure seemed like the thing was past 7100RPM. |
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