DTC's came back

[cpapashley]

where did you get to drive at 140mph.....

I think I would like to come and visit...


I think it may be time for a tune, but seeing you are already going down the path of doing a lot yourself, why don't you get a wideband hooked up and get one of the less expensive alternatives for tuning, and DIY. I know all the rage on here is to go to a dyno, but you definitely seem like someone who would have a good time tuning. Lots of help in various places to tune correctly etc.

I have had a chance to go and get some more airflow info after getting the exhaust in.

Interesting how the airflow has smoothed out significantly all through the rev range now, and significantly improved in the lower revs. Will have to take some time to log some lower revs, just haven't been bothered as they have been so erratic, seem so much smoother now. Interesting.

Bit more airflow as well than before. I have obviously reached the peak of this manifold. But interestingly at peak torque I am up around 95% Volumetric efficiency, and I am above 90% v/e between low revs and 6150rpm. Sounds like everything is running quite well in there. It would be so good to compare some info from yours. I realise that temperatures are so different, and I know a 10C difference for may makes a huge difference. So I am at 28C when I have been doing the tests. I am sure it would not be to hard to factor in your details and compare apples with apples. should be able to adjust for the difference of temperature, afterall it is only a calculation.

[Gorman]

Hi A. since this is a public forum, i can't say too much on certain subjects. What i can say is, i remember reading that sighting an air filter in the wheel well is a poor choice. It said that this was a low air pressure area. It meant the engine was sucking air in from a vacuum..effectively. Try turning your air intake round and face it into the wind...( just like an F1 and WRC cars do) $1 says your airflow chart will look a little different !! If you design your scoop so water is forced down and out of a drain no water should reach your MAF. A vortex is another way to separate water and debris from the air...let playtime begin..G.

[Gorman]

Originally Posted by Gorman

Well A. it's over a week and the codes have not come back. I only said that there may have been a leak..the car showed no symptoms at all of an air leak when i had those codes It did 140mph..it would not go that fast with an air leak.. I believe my sensors are ok..they tally with the readouts i get from emissions tests. The 160g / sec equals 24lbs a min of air..maf goes to 35lbs , no prob there then. The car runs OK now but only reaches 110. So.. it runs very smoothly, idles fine..but does need a tune/injector constant table update... I think what you said about open loop and closed loop running is proved by this. Personally i prefer to have to drive slowly for a while with the 19's than have the 17's and the risk of overheating and engine failiure when overtaking at high rev's in 3rd...G.

ok quick update. the 19's have been in for two whole months. The car runs very smoothly. Top speed is now easily reached. The ecu does not seem to have a problem coping. Foot down acceleration in 5th is as responsive as it ever was. That said..i have now bought an ecu from an svt and i'm going to fit it and see if it makes any difference to the running of the car. By the way; the lean codes have not come back since christmas. Make of that, what you will..(no point getting brow beaten again)...cheers G.