| Author |
Message |
Martin (Miami348ts)
| | Posted on Tuesday, October 09, 2001 - 5:16 am: | |
Thanks guys.
I am an engine idiot. That was very helpful. Makes perfect sense though. |
James Dixon (Omnadren250)
| | Posted on Tuesday, October 09, 2001 - 1:20 am: | |
There is also something used on turbo cars called a blow of valve/pop off vavle (bov/pov) which vents air to the atmosphere when the gas pedal is released to change gears. The ensures that the high speed air coming from the turbo doesnt hit the closed manifold valve and go the wrong way down the tube, causing resistance for the turbo.
It is a distinctive whooshing/hissing sound that sounds pretty cool. |
Michael A. Niles (Man90tr)
| | Posted on Monday, October 08, 2001 - 11:55 pm: | |
Peter is exactly correct but also note that a wastegate can work in the other direction as well. In turbo airplane engines the wastegate regulates the amount of compressed air from the turbo air going into the engine. The higher the airplane climbs in altitude the wastegate actually closes and shunts more compressed air into the engine (not overboard) so the engine can keep producing above sea-level manifold pressure. Same as in Peter's example but it actually reducing pressure relief -- therefore increasing pressure. Wastegates in this case are usually fully closed at around 12,000 - 14,000 feet. Cars usually have just fixed wastegates (only capable of a specific pressure differential), except for serious race cars where they can "dial in the boost" ie -- close the wastegate. In cars, the wastegate can simply pop open in order to relieve any oveboost situations. In airplanes, there is a usually a separate relief valve that blows open and reduces pressure if a certain manifold pressure is exceeded. In this application, the wastegate itself usually stays closed and a separate valve regulates the over pressure situation.
At least this is my understanding of it. |
'75 308 GT4 (Peter)
| | Posted on Monday, October 08, 2001 - 10:12 pm: | |
A glorified name given to a pressure-relief valve. Any excess pressure that builds up between the engine and turbo in the exhaust manifold, is "wasted" out through a bypass pipe into the muffler. |
Martin (Miami348ts)
| | Posted on Monday, October 08, 2001 - 9:58 pm: | |
What is a wastegate? |
'75 308 GT4 (Peter)
| | Posted on Sunday, October 07, 2001 - 9:31 pm: | |
If this is a US F40, could this "right-side" light be a slow-down light (meaning one of his catatlytic converters are overheating)? |
Grady C. Smith (Italianauto)
| | Posted on Saturday, October 06, 2001 - 8:34 am: | |
Hmmmm....I'll have to ask him. He said the right side light was coming on. When I rode in it you could hear what sounded like it opening up on the passenger side. |
'75 308 GT4 (Peter)
| | Posted on Saturday, October 06, 2001 - 1:15 am: | |
I thought F40's only had one wastegate?
Or do you mean the passenger-side turbo is cooked? |
Grady C. Smith (Italianauto)
| | Posted on Friday, October 05, 2001 - 7:53 pm: | |
Had a track day yesterday and a friend of mine had his F 40 out there. The passenger side wastegate was dumping way too soon.
Does the wastegate need to be replaced?...or is there another cure?
Thanks for any advice. |