Date: 11 May 2004 14:05:35 GMT From: Dave Hinz <DaveMay2004nospam-creek.net> Subject: Re: Cost of repair Audi BMW Saab...(crossposting)
On Tue, 11 May 2004 14:33:31 +0200, JP Roberts <1234nospamo.com> wrote: > Dear Dave, > > You're right. I've never driven a Saab, but I am totally confident that the > only turbo engine about with no real lag is that which has the "bang-bang" > system, and this, as far as I can remember is only in Subaru's and EVO's > realm, never Saabs. How much do you know about Saab's Trionic engine management system? > I could already tell turbo lag in my 1.8T even before it was chipped, and > Audi's 1.8T can be made to give much higher peak power than any Saab can > ever get, so I'm sure it's better engineered, even if it has less cubic room > than the 2.3 Saab couterpart. Torque curves, son, torque curves. Post links to the graphs, otherwise it's just noise. > As yet, and > according to my sources - correct me if I'm wrong, there is no "normal > street" design that will be good enough for lag simply not to be there, > which is only sad, given that in my opinion lag should now be a thing of the > past. Not to be there? As in, unmeasurable? No. Until someone comes up with a turbo with a zero-mass impeller (physically impossible), it's not going to happen. Managed such that it's un-noticable? It's here today, just not in your car apparently. > According to what I've read, it takes something like the RS6's 4.2 l engine > for lag to be nearly unnoticeable, and that's a biturbo. But chip that and > I'm sure lag is going to become more apparent. Based on what specific data, please? All I see from you is speculation, and I'm not sure you're exhibiting clear understanding of what factors differentiate engine management systems from each other. Any turbo is going to have lag, which if you try hard enoug you're going to be able to notice. The lower the mass, the less the lag. I still stand by my statement that all 3 are well-designed cars, cost about the same to fix, and that the original poster (who has, undoubtedly, long ago abandoned this thread) should try all 3 and buy the one he likes best. Dave Hinz
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