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#1
February 6th 2011, 10:00
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IDC at 100% ? Injectors too small also? I figured 1000cc would be enough running pump gas at that horsepower level.Perhaps not enough fuel pressure for the amount of fuel volume needed? In other words rail pressure is dropping because the pump canīt keep up with the boost/fuel ratio and maintain the desired pressure and the injectors try to compensate with longer opening intervals? Itīs just a guess - Iīm not sure if that makes sense but I canīt imagine that the injectors are too small at that level?
Maybe itīs none of the above and you donīt have enough electrical power/current to support the pump? What I donīt understand is,youīve had a higher boostsetting,ran richer(?) and HP before the turbo change.So how is it possible that it suddenly collapses? 
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#2
February 6th 2011, 12:12
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I have found the cause: my feed pump wasn't running well and I got stranded because it didn't run at that moment at all anymore!
Logical that when you have no fuel anymore, the engine dies out...duh! I had a spare 944 pump I switched over and it started cold immediately again :mrgreen: Pffft! I left the fuel pressure to 60 psi, so according to the flow sheet that should give me 1180 cc, which should be enough anyways. Just need to re-map the fuel map but thats no biggie. Very glad it was something this simple, but scary as it could have ended far worse. Amazingly and fortunately the engine held...
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#3
February 7th 2011, 05:01
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Quote:
I'm far from your level of power but running an EFI also and I recently had fuel delivery issues... It had nothing to do with the pump but by testing, I was amazed at how long the engine keeps running with the pump unplugged... I've therefore decided to play it safe, always have a second pump in place, in case the first one lets go far from home... Hope yours holds from now on... And if I may add, you're car and its engine and quite amazing... and every time I recieve the "Post update", I just can't help thinking : What if I added even a small turbo to my 2007... Sebastien
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#4
February 7th 2011, 08:13
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Quote:
However, thats where you would go wrong! The smaller the turbo, the larger the exhaust restriction, the higher the Back Pressure in the exhaust, the higher your exhaust gas temperatures, the sooner you have knock and temperature related exhaust valve and valve seat problems. IF your adding a turbo, use a large one with respect to your engine size and more specifically: also one with a relatively large turbine wheel compared to the compressor wheel. Thats what I love about the Borg-Warners: their compressor-turbine wheel ratio is larger towards the turbine side compared to Garrett turbo's, which lowers back-pressure and increases efficiency.
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#6
February 7th 2011, 10:57
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When I first read that the injectors were at 100%, 1.3 bar, 398hp I was thinking something was not right.
Glad to hear it was a minor problem and the engine was not damaged from the feeder fuel pump failure. Sandeep
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#7
February 7th 2011, 12:14
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Yeah, it didn't quite add up to me either tbh, but if you see 100% IDC in the datalog, my first reaction was: injector too small.
I actually learn something everytime I visit the dyno  Quote:
1,21 GigaWatts  (you have to be a little bit old(er) to get that one I'am afraid...)
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