tims 2 penceworth
Morning all. Well my R33 does this too. I could be completely wrong (this is not unknown) but I reckon the ECU runs the engine so rich on cold start that the fuel is making the engine stumble so thats why it doesnt pick up. It only takes a couple of minutes for the cylinders to get hot enough to change the way the engine runs and all is being burnt properly. The over-rich condition is backed up by Garys findings on carbonised piston rings, and all of us running more boost than stock will have a higher fuel delivery too. Many of the Japanese tuners use an excess fuel delivery to cool down the combustion temperatures, so often there is too much fuel present, albeit better than having a hole in your piston, and more fun when toasting all the tailgaters with flames !
Lets face it we shouldnt be running much boost at all when the thing is cold (80 percent of cylinder bore wear occurs when the engine is below operating temp, good oil helps this condition but the fact is it still happens). So in my case, I poodle around like an old fart until I see my oil temp gauge has at least moved onto its base line, then vroomvroom away we go. Probably completely wrong but it works for me. Because of all the 'blow-by' (past the rings) that turbo engines suffer from, combined with all that extra fuel, it re-inforces the need for some high quality oil and a regular change in our cars, especially when thinking about how small the oil capacity is (a 911 for example has about 3 times the volume of oil than an RB26)Anyway I must stop rambling. Tim
