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Dump valves?
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[quote][i]Originally posted by tiga77[/i] [quote] Ive noted the highlighted areas and heres my comments: 1) The MAP sensor is an ALTERNATIVE to air flow meters - cars do not have both. MAP sensors have never been in question - so kinda pointless highlighting that bit. It does say "based on my experience, with air usage measured by [b] air flow meters [/b] before the turbos. [b]It is not applicable to cars that soley use a MAP sensor [/b] and throttle angle for air measurement" 2) The second bit you've highlighted basically says that he converted his car to dump to atmosphere. After noticing the dump valves were constantly open at idle (obviosuly in the form of a single dump valve unlike the twin piston bailey DV26 which resolves stalling issues at idle - and ONLY stalling issues at idle), did he create solenoids to essentially convert when the flange opened (basically like a twin piston dump valve but using solenoids on a single piston D/V). Nothing more to say here - basically that he converted his car from recir to dump to atmos. 3) Third bit youve highlighted - his car chucked out black smoke - shows my point that the dump to atmoshpere aint too good! Just cos other cars dont throw out black smoke doesnt mean its not happening. 4) Again the mod he was 'planning' was to leave his car to dump to atmosphere which would have caused damage. He then says that anyone with a similar AFM (air flow meter) before the turbo (as most do inc. MR2, impreza etc etc) NOT to dump to atmosphere. [Edited on 08-05-2004 by tiga77] [/quote] 1/ duh - [b] If you knew a simple thing like this what was your point in highlighting it??? [/b] 2/ can't trust the opinon of a tunner that tried to work a standard recirc as a VTA DV - [b] Cant trust or wont give in? This guy is an engine expert and has a good reputation in the formula 3 series. Search for his name, Im sure you'll find something [/b]. 3/ mine nor anyone elses that I know of chucked out black smoke when changing gear or lifting off throttle when VTA valves are fitted. the reason for his car doing it is more likely down to the tuning it has had. (black smoke overfueling) - [b] It may well be the tuning its had but still doesnt change the issue of overfuel/underfuel = detonation. [/b] 4/ most turbo cars do work with VTA valves. some like the VAG 20VT don't often work. some people however do run them and they work fine. also if they are that bad why would a lot of tunners of high performace engines put them on their cars. I doubt they don't do tests to make sure the car does not pink.- [b] Thats right, a lot of cars do work with VTA D/V's - Ive never disputed that. MR2's and Imprezas will run with hardly any noticeable difference with a twin piston D/V. The point is, what is going on INSIDE the engine. Just cos you cant see detonation, doesnt mean its not happening. [/b] one other thing I would have to say is that if you run a cone filter and run a recirc valve you get discharge of the dumped air going back through the AFM and out through the filter. also once the boost has been dumped the turbo has to spin up again sucking air in (going through AFM) getting back up to full boost (ECU measures the amount of boost at manifold). Running an VTA DV may well cause small changes in the Air/fuel ratio straight after changing gear on some cars but this change will be insignificant if the car is mapped properly. for my car to run significantly lean after changing gear would mean a lot of petrol not being injected (plus my car don't use the lambda at full throttle over 3000rpm anyway) [b] That is true - but over time with a VTA D/V, regardless how small the detonation may be, over time = damage, which is what Ive been saying all along. [/b] [b] my views on DV's are VTA - Fine if youve got a MAP sensor or run a standalone system like the Motec/Link unit which erradicates the use of AFM. Recirc - if you want the best performance you can get and reduced lag between gear changes. Agreed [/b] Is this discussion over now?? [Edited on 08-05-2004 by tiga77] [Edited on 08-05-2004 by tiga77] [/quote]
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