Whats Next?

[XfireZ51]

We should probably let Lee have his thread back. Maybe start a new one. Paul is correctly characterizing my discussion. It really goes back to breathing more lift/duration or more valves. I feel that a OHV motor is optimized for a particular region of the rpm band whereas an OHC 4 valve has great breathing ability without as much of a sacrifice to reasonable part throttle and idling characteristics. When it comes to all out performance, it's clear GM has decided on the in block cam config and for a lot of very good reasons like packaging, weight, center of gravity, simplicity, hood line, etc, etc. and w the engine management capability of today's processors, the LS/LT motors can really be made to perform and behave all at the same time.
Commenting on the cylinder head, my point was really about how capable the LT-5 heads are given they were designed for a 5.7ish L motor and yet can be found supporting motors of nearly 26% more displacement. In addition, it's all we've got, there ain't no more. no AFR, no TrickFlow, no Brodix, no nuthin'.
Not to mention crank and cams. It's all on us here. Nobody out there helping us out. Just like Lee here doing it pretty much on his own, his own time, his own money. That's why I admire the LT-5.

[Bearly Flying]

"Well, perhaps that's all that matters to some. But, to others, myself included, a rough-idling, over-heating in traffic, often stalling beast with high stall rpm converters, or no off-idle torque...is no fun to drive: been there, done that! "


So have I, trip to B.C. last year, car was stumbling, flooding. Stop and Go traffic was a killer. Turned out to be O2 sensors, but that trip was a nightmare.


Lee's experiment was good, altho the results weren't what was expected, it may provide some insight to the next step.

[LGAFF]

Going back to the dyno soon

[batchman]

Originally Posted by Paul Workman

But, to others, myself included, a rough-idling, over-heating in traffic, often stalling beast with high stall rpm converters, or no off-idle torque...is no fun to drive

I LOL'ed on that one, since I've taken the ZR-1 apart for revision 3 suspension I've been autocrossing friends' "C Prepared" cars. Change "traffic" to "grid" and you've got these cars nailed. Except that for the minute you're driving them - when they are an absolute laugh riot.

And just so you know I'm not poking you Paul, on the street I could not imagine anything of the sort...

Honestly the car reminded me very much of the ZR-1 on a 1st gear parking lot course. I now see why the SCCA rules guys were focused on making sure you could not put an automatic behind a ZR-1 within the rules when I asked them to combine all C4's (so I could use the quick rack).

Later,
- Jeff

[-=Jeff=-]

Whats Next?

Finish the 91 or the Callaway