Higher compression ratio will increase the thermal efficiency of an engine, but not by any massive amount.
From memory i believe maximum thermal efficiency occurs at an effective compression ratio of 16:1, and after this there are no real gains to be had on gasoline.
The effective compression...
You know what pat, I completley agree.
I ended up timing it set to zero and using the balancer marks and then double checked it using the dial and TDC and I did notice discrepencies.
With the timing set at 15deg using the light in the old fashioned
manner, when I dialled it up on the timing...
How true. Lol
I would have checked it earlier but the ignition system is coil on plug. Which sounds really romantic until you want to check timing using a conventional timing light lol. So I clip this inductive pickup WHERE now?
In case you are interested I lost 5hp according to my g-tech pro.
Hey everyone,
I'm going to look really silly now. But i got hold of a dial-in timing light and as it so happens the timing was out by about 6 degrees.
This meant that at 18psi i was running 16deg of advance.
Anyway I have corrected that now and the detonation seems to have gone.
I have set the...
just had a thought and went back through some datalogs.
i dont as a rule graph timing as i dont often change it. anyway, as it turns out the microtech ecu can only retard timing back to static.
This means as my static timing is set to 10deg BTDC that my minimum advance is also 10deg BTDC.
Damn...
Yes I do run a wbo2 branded lambda which I log during runs against the microtech engine data.
As for the compression ratio. It's around 8.1 to 8.5 I can't exactly remember right now. But it is low 8s.
Dynamic compression ratio? No idea. Stock cams so I'd imagine it is not going to drop off too...
I'll try to clarify some things.
I did mean detonation, not pre-ignition.
Brian, that's correct. At 18psi and 5000rpm the advance is at 2 degrees. By 7000rpm it has dropped to around 15psi due to the turbo being too small. But I'm not too worried as I have a spare and want to see the limits of...
I disagree LionelHutz.
It is very possible for the alternator to fail to charge if the charged indicator bulb is blown. It just depends on the alternator in question.
As for a bit of an explaination as to the way the light works;
1) Battery voltage is supplied to one side of the bulb when...
Hey all,
this is my first post and i'm hoping someone here can help me.
I am tuning a Nissan SR20DET (2.0l turbo petrol) with a Microtech ECU.
I run BP Ultimate (98 pump octane) and my intake temps range from 5 to 25 deg(C).
I have a map compensating for air temp at 1.4% fuel per 5deg(C) with...
