Quote:
Originally Posted by whiteboyblues2001
Yes, but if you think about it, the only way for maximum torque at such a low RPM is to add boost with a larger turbo with a waste gate. So, you end up getting boost early on in the RPM range. What does that do to MPGs? It lowers it significantly. No MPG advantage anymore, so what's the point? Plus, these engines tend to hit their HP peak quite early in the RPM range, and fall off sharply after that. You end up having to short shift the car, and you don't get good performance either. So, you end up sacrificing MPG gains (that you would have gotten with an older turbo design) to get less high end performance, to get low end torque and get rid of turbo lag.
If low end torque is the goal, just buy an LT1. 315 lbft at 1000 RPM is amazing. 455 HP at 6000 RPM is awesome, and 28 highway MPG's make it better in every metric. The SS produces more power, performs slightly better in a straight line, and gets significantly better MPG's than the M4. And it has more torque at low RPMs than the BMW's turbo engine. And then there is the turbo lag (while minimized, it is still there) and shitty exhaust note. Most things in life are a trade-off. You usually trade performance for MPGs for example. I can't really think of an advantage of the BMW engine at all. What did you get by going I6 Turbo instead of N/A V8? I am guessing it's a bit lighter, but apparently not enough to help out in terms of performance. Of course, if you mod your cars, turbos are easier and cheaper to get significant HP gains, but then you are back to big turbo lag, and even worse MPGs.
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I believe the TTV6 in the ATS V accomplishes this electronically. It's been awhile since I did any reading on that engine, can't recall exactly how the system works, however, the point is that they found a way to eliminate or at least greatly reduce turbo lag at low rpm using some type of electronic valve. Perhaps someone here knows the specs on this.
Which is why I wouldn't be overly surprised, only a little surprised, if the z/28 had a derivative of this engine with a very sophisticated suspension, whatever that might be. I do think it would take a lot of guts for GM to not put a V8 in the Z/28 though. If they make a Z/28