Quote:
Originally Posted by Speedy Squirrel
OK, there's alot of questions here:
BeepBeep - "Which cars open idle valve on deccel?" An example that I have seen recently is the 2004 Dodge SRT4. After '04 most cars switched to ETC. There is no more IAC. In current cars the throttle is held a little further open with the ETC to produce the same effect. The 2004 Porsche Turbo is one that I have seen in that category.
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But "Throttle-By-Wire" is no idle valve. It's a servo-controlled throttle. The same exists in SAAB 9-5 and is mapped to open little further than requested to mask turbo lag. It's also closes quite slowly in order to keep emissions low...which is very annoying as revs shoot upwards between shifts when clutch is depressed (even when throttle is released). This can be mapped away in the software.
Once again, this has nothing to do with turbo longevity or decreasing spool time...this is purely emission strategy, and annoying one to boot!