glass slipper

Let me take a moment and destroy your opinion with facts. The LT5 was designed as a dual mode engine with the throttle valves in the secondary runners. The primary lobe on the intake cam has 20° less duration than the secondary lobe and when you're cruising along you have one small intake valve, one small runner, one small fuel injector, and a ''dime'' size throttle plate in the throttle body feeding one big cylinder...as Tom has pointed out, the LT5 achieves very fine control down to a very low RPM. The idle RPM of the engine is 500 RPM so the RPM itself isn't a problem. Now consider this ''high performance'' car was designed by the GM engineers (who are much smarter than any of us here) to go into 4th gear at 12 MPH while accelerating at a light-moderate rate...run the numbers and you'll see this puts the engine at about 542 RPM. If you run the numbers for 25 MPH in 6th, you get about 564 RPM...so tell me again how I'm lugging the engine when I'm above what the engineers designed the engine for (in spite of your ill-informed opinion).

I don't care what you guys run your engine at and didn't intend to start a war over something so silly, my only intention was to show how much low RPM torque the LT5 has. My engine doesn't complain a bit but I'm at sea level in Florida (well not any more, I'm in Spain for 3 years as of last week) and the roads are very flat. Yes, it does accelerate slowly from there and I slowly roll into the throttle to keep up with traffic...if I have trouble keeping up, I just downshift to 4th. I've driven it this way for almost 22 years and have had no problems with the engine. BTW, I do autocross it where I beat the crap out of it and am not afraid to bounce it off the rev limiter once or twice...I have many trophies over the years and am competitive with C6Zs, I don't beat them all but I do beat most of them.

I'm not afraid to exploit all of the excellent design elements of the LT5...if you're afraid, just say you're afraid.

glass slipper

As noted in my post above, the RPM at 25 MPH in 6th is higher than 12 MPH in 4th which the engine IS designed to do. If your engine ''bucks HARD'', you most certainly have a problem. Personally, I couldn't care less if you fix it or how you run your car but it is most certainly a fact that your engine has a problem. What I do care about is you stating something as ''fact'' about all LT5s based on your broken LT5...these engines were designed to be a tractor engine at low RPM for fuel economy.

glass slipper

Thanks for the info, I wasn't aware of that! I was only thinking about the intake runners and neglected what I always say about torque being primarily a function of displacement and compression ratio...the LT1 has higher compression than the L98.

Also, thanks for the help/info on the low RPM capabilities of the LT5.

z06scentair

Well I appreciate your could'nt care less attitude.....

As far as my LT5 being broke.....seems to run fine for me.

Would love to see pictures of this tractor engine corvette your referring too.

glass slipper

So you're saying GM engineers designed the 1st-4th skip shift for the expressed purpose of ''abusing'' the engine. Congratulations, you are the first Corvette Forum member who is smarter than a GM engineer....

z06scentair

No we just cruise around in 6th at 25mph to appease the zoo animals.

glass slipper

Buy and read the book ''The Heart of the Beast''. There are none so blind as those who refuse to see...I'm not going to waste my time if you don't have an open mind.

dtana

Well the official "expressed purpose "is that the 1 to 4 skip was designed to save gas when you're not demanding much of the engine. I don't think anyone is saying what you've said above.

glass slipper

Just to be clear, I'm the one driving in 6th at 25 MPH. That would make you one of the zoo animals...I'm guessing an ostrich.

z06scentair

You got it Sport!

z06scentair

Ok Sport! Have a nice day!

glass slipper

I didn't say it, I quoted this guy:

Just to be clear, a 25 MPH cruise requires less than 5 HP...what is your definition of ''not demanding much of the engine''?

For people who don't care what I do with my car, you guys are sure wrapped around the axle on this.

Tom400CFI

I just got back from Salt Lake. B/c of this thread, I decided to take the 'Vette and make a vid.

Here is a very boring video of me driving through my neighborhood at 25-32 mph. I climb a steep hill at the beginning in 4th, 5th, then shift into 6th at ~ 0:23. Down shift to 5th at 0:52, back up to 6th at ~1:00 to the end of the vid.


Now you'll watch and say, "I don't see anything noteworthy." That is exactly right. My engine isn't bucking, lurching, vibrating, rattling...nothing...just rolling along w/no complaints. You don't have to, but...It can do it.

USAZR1

If you don't care,why don't you shut up and just let it go? You were doing ok there for awhile but continuing this stupid argument just makes you look foolish.

z06scentair

You must have intended to say "half shaft" correct Sport?

USAZR1

Tom,I never said your car or glass slipper's car would not do what you say it will. I only said I saw no need to try it with my car. Is there a problem with that,guys?

Tom400CFI

B/c you (those who believe in "lugging") are spreading misinformation! Lore! It's not true.

Who looks foolish? The person speaking fact or the person who passes off his psychology as "fact", then gets pissed at the presentation of fact? Yikes.

Tom400CFI

Absolutely not. In fact, if you look back to post #34, you'll see where I said; I believe GS said about the same thing.

My problem is when people blurt out things like; And...

...when those statement just ain't true! Drive your car how you want to! But don't mislead others by making false claims, based on your "feelings" and state them as fact.

USAZR1

I give up,Tom. Have a nice day.

Tom400CFI

LOL Give up. I wonder if you even read what I wrote. Or watched the vid? Did it look like the car was being abused?? You have a nice day too, bud.