m60 intake cams on m62b44 boosted engine. Increase Dynamic Compression

[dovlet]

Hi Guys, I have e36 with m62b44 engine with cams from m60. I have boosted it up to 14 psi but no changes in time 100-200kmh in comparing with 7psi of boost. I thought it is due to Cams limit and decide to open intake cams early and turned 10 degree to the left counter clock wise. So, then tested my car again but no changes. So, currently, my cams open early and closes early. I lost my low and middle power end, but high rpm power was not changed.

What do you think Guys?

[dovlet]

Hi guys,

Still cannot increase power on my car. No changes between 7psi & 14psi. No back pressure,injectors 630cc, duty 50-60% max. Fuel pump AEM 320l/h. Engine working temperature 85 degree C max. EGT 800-850C.
Here is fuel:
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Ignition:
ignition.PNG

[Def]

That timing map is.... messy. Is your fueling ok at 200 kPa too? Why the huge jump in fueling VE on the last row?


Maybe you're out of compressor flow, or maybe you have higher exhaust back pressure pre-turbine than you think (how do you know things are fine there)?

[dovlet]

That timing map is.... messy. Is your fueling ok at 200 kPa too? Why the huge jump in fueling VE on the last row?


Maybe you're out of compressor flow, or maybe you have higher exhaust back pressure pre-turbine than you think (how do you know things are fine there)?

I just made correction only those tabs where i am actually run. Using log files.

I have modified oem exhaust manifolds to turbo manifold. You think that can be reason? I thought oem is exhaust manifolds is good enough. What should be minimum diameter of turbo manifold for my engine for 1bar?

[GazM3]

It’s hard to diagnose over the net. The factory exhaust manifolds are pretty restrictive once approaching around the 500bhp mark. What’s the air /fuel ratios like? What fuel pump and fuel pressure are u using? If running a factory fuel pump or factory wiring to a large fuel pump may not be keeping the fuel demands met at higher boost perhaps. I’ve got a supercharger build on an e34 and the power difference between 8psi and 16psi (I have a wastegate with 3 port solenoid) is rather dramatic.

[dovlet]

It’s hard to diagnose over the net. The factory exhaust manifolds are pretty restrictive once approaching around the 500bhp mark. What’s the air /fuel ratios like? What fuel pump and fuel pressure are u using? If running a factory fuel pump or factory wiring to a large fuel pump may not be keeping the fuel demands met at higher boost perhaps. I’ve got a supercharger build on an e34 and the power difference between 8psi and 16psi (I have a wastegate with 3 port solenoid) is rather dramatic.

AFR is 11.5-12, Pump Fuel Pressure is 4.5 bar, fuel pump wires been changed. I cannot explain why I have no increasing in HP. Perhaps due to some of next reasons. 1. Camshafts, 2. Exhaust restriction, 3. Gas is 86 octane.
JFYI: 13psi 100-200kmh is 10.8sec. 8psi 100-200kmh 9.4sec. Intake temperature is about 30 degree C.

[Johnbennett103]

I has to be some type of restriction. It's mass flow that increases horsepower, not necessarily boost. Anyway you can measure airflow directly? Also if its a supercharger, more boost also means more heat which hurts HP. You would also need to measure intake air temps.

[Def]

86 octane? Is that RON or AKI (RON + MON / 2) like the US uses? Either way, that's super low octane, so I could totally see you running almost no timing to try to keep that from knocking which will limit power or sometimes cause it to go down with more boost. This is especially true if you have OEM compression ratio in your engine.


Can you log MAF voltage? That would be a direct measure of intake massflow.

[dovlet]

86 octane? Is that RON or AKI (RON + MON / 2) like the US uses? Either way, that's super low octane, so I could totally see you running almost no timing to try to keep that from knocking which will limit power or sometimes cause it to go down with more boost. This is especially true if you have OEM compression ratio in your engine.


Can you log MAF voltage? That would be a direct measure of intake massflow.

That octane is American std. My CR is 9:1, car is turbo charged, not supercharged.

[Def]

That's very low octane, I have to run fairly soft timing with 92 octane AKI and 8.8:1 CR and similar boost numbers.

I know you have a turbo. MAF = mass airflow meter (I think HFM is the more German term - hot film meter). Gives a 1-5V signal for airflow - useful to log to see if you're actually flowing more air through the system. It also does no good if your thermal efficiency drops off so much quicker with your reduced timing vs. the increase in air.

Honestly, any MS2 based hardware I would absolutely not trust my engine to the knock circuit - they are horrible...