| I was talking about the staight RPM lines plotted over the chart (added by Tektrader) not the efficency islands. I guess I should have made myself more clear. So was I, after the first sentence. Read the post again. I've haven't attempted to make anything in MS Paint. A better understanding how to read these charts with engines of wildly varying flow would be very helpful in picking out what turbo application to chose for your engine. Instead of simply basing it on 1.5l of displacement (how most have been reading these charts) but also taking into account how a really great breathing engine will effect how efficiently you will be using a given turbo at a given RPM (basically help people with varying amount of port/flow work better understand how that increase in Flow/VE will shift where in their turbos efficiency range they will be operating. I never said anything about tuning my car based off a compressor flow map. The lines shift to the right. If one is more restrictive they can be flowing the same CFM because as the more restrictive one would me more pressurized. The total CFM of a 70% VE engine and a 90% VE engine will not be the same at any rpm. I think you mean the engine with the LOWER VE will comsume(if by consume you mean restrict) more CFM/rpm. Then you don't know what "consume" means. If by comsume you mean flow, then an I agree. I also agree with everything else after the first sentece. Do you agree with my point that an engine with a HIGHER VE will have lower EGTs at the same power level? By consume, I mean consume. Your point sounds valid to me. I agree that "boost" is not the right way to think and go into that HERE The basic points I am making above are still valid though, whether or not they are the ideal way to think about it. Again, we are on the same page here as well. Agreed, but higher VE != higher EGT as you insinuate with the above statement That's completely incorrect. The higher the number of oxygen molecules in the combustion chamber, the higher the EGT. "Higher VE = higher CFMs = higher EGTs = higher turbine speed.
This is pretty basic theory, isn't it?" Timing, A/F being equal the EGT will be lower at the same power level with a higher VE engine. You just added a qualifier that was not in my post. The fact remains that engines with differing VEs will not make the same power at the same rpms, so your point is moot. I hope my point isn't buried in what you consider "arguing the semantics of the problem". Am I getting to "the fundamental truth of the matter"? Or has my "anal retentive nose-picking has brought the discussion to a new level of abstract inconsequentiality"?
No.
Yes. This whole post is arguing the semantics of my previous post. Again you're just posting to be posting.
Recursively Yours,
Kenny...
PETZ Member #5
SteamyZ. Never had did me wrong. - SL103 07/06/04 11:58:15
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