Now I know why I have 2 fuel pumps !
06-03-2005, 02:11 PM
#1
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Now I know why I have 2 fuel pumps !
I feel a little dirty even making a post with the tragedy which has happened, like most people on here it makes me feel sick in the stomach, such a waste and all in doing and enjoying what all us like minded Rennlisters do - truly terrible and very much in my mind 
I had been experiencing the engine cutting out under overboost in 4th,5th and 6th. As the revs hit around the 5K mark and the boost swung towards 1.3 to 1.5bar it would judder, the engine protecting itself by killing the spark (I think - that's what it feels like) then clearing after the high torque range and reving out viciously. It turns out that I have a dodgey second fuel pump relay and the engine is not recieving enough fuel at peak torque hence the cutting out. New relay problem gone. I am pretty sure that the torque levels at this overboost level must be in the 800-850NM level (rather that the WOT engine dyno run 736NM)
I am doing an exiting experiment next week which will involve evaluating a new intercooler and a Maha chassis dyno during which I will attempt to ascertain the overboost numbers
I had been experiencing the engine cutting out under overboost in 4th,5th and 6th. As the revs hit around the 5K mark and the boost swung towards 1.3 to 1.5bar it would judder, the engine protecting itself by killing the spark (I think - that's what it feels like) then clearing after the high torque range and reving out viciously. It turns out that I have a dodgey second fuel pump relay and the engine is not recieving enough fuel at peak torque hence the cutting out. New relay problem gone. I am pretty sure that the torque levels at this overboost level must be in the 800-850NM level (rather that the WOT engine dyno run 736NM)
I am doing an exiting experiment next week which will involve evaluating a new intercooler and a Maha chassis dyno during which I will attempt to ascertain the overboost numbers
06-03-2005, 02:47 PM
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Originally Posted by K24madness
Make sure to have the dyno log boost and fuel.
I am only evaluating wether an intercooler works or not and doing some power runs, I won't be letting anyone mess with my expensive programming. Don't forget it is bespoke for my exact set up and controls everythingincluding the boost and fuel - they will be fine. The only reason to log them is for interest.
06-03-2005, 03:16 PM
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Originally Posted by TB993tt
Madness
I am only evaluating wether an intercooler works or not and doing some power runs, I won't be letting anyone mess with my expensive programming. Don't forget it is bespoke for my exact set up and controls everythingincluding the boost and fuel - they will be fine. The only reason to log them is for interest.
I am only evaluating wether an intercooler works or not and doing some power runs, I won't be letting anyone mess with my expensive programming. Don't forget it is bespoke for my exact set up and controls everythingincluding the boost and fuel - they will be fine. The only reason to log them is for interest.
It will be interesting to compare dyno readings between your RS tuned engine and their recent one on the same MAHA dyno, I bet you are excited.
06-03-2005, 03:37 PM
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Jean
I will start another thread on this when I've got a bit more time - yes it is very exciting and a lot of fun with reputations on the line
I will start another thread on this when I've got a bit more time - yes it is very exciting and a lot of fun with reputations on the line
