However I am losing 4 or so kpa still despite the new intake. Thats a bit sad. However as the intake pipe is 90mm and a certain piece of junk is 85mm with a mesh and air blade stuck in the middle of it. I think Ill be fitting this piece of equipment pretty quickly!
I actually have a black piece which in theory should fit exactly where the MAF is at present. That will be going in ASAP to help look into the missing air pressure.
I cant imagine its the intake as they are supposed to flow around 320cfm much the same as the heads. In theory that should be good for around 600fwhp. Stock; the engine is nowhere near that. I suspect Ill gain a couple of kpa from removing the MAF. We will see.
So anyway here is the latest Dyno Log run.
Spark timing was recovered via some gentle ECU tweaks. Thats a 12% torque gain tune only in effect. BHP is also up about 8% over the original pull. But I think there is another few percent of easy gains from sorting out the missing intake air pressure.
Once thats found I might try some 97 octane or even shell 99 as Im running on standard 95 RON at present. I actually had to take about 3 degrees or so out of the midrange as the OEM tune was knocking constantly at cruise believe it or not!
I guess HSV think that running up against the knock limit and pulling timing constantly is a good idea. Not sure why! Near on 10% gains to be had by avoiding knock and reducing timing! It was the same story with the LS2. I made more power with less timing. Perhaps part of the problem is getting 1*C intake air at load on open roads in Australia!
Forgot to also mention gains were also had from changing fueling a tad.
A fellow VXR8 owner with ported intake and throttle said he gets near 100kpa with the MAF. So thats very sad. Suggests the issue lies with the intake or throttle. Thats a bit harder to cure. Ill see what happens swapping the MAF out. It might give me one or two kpa. I can then console myself that all is not lost.
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