Repair-It

kevm14 wrote:That's not the carrier.

That was more of an lol.

I did some maths.

With 3.73, 4L60-E and stock 215/65-15 tires, cruising RPMs are:

2,250 rpm @ 65 mph
2,600 rpm @ 75 mph
Source file included. You can look up different tire rev/mile specs and put in what you want. You can also change the fuel cut (or change it to shift RPM) which modifies the conditional formatting. Everything in yellow can be modified actually. Try a different gear. Like 3.08.

Drops to
1,850 rpm @ 65 mph
2,150 rpm @ 75 mph
Big difference. And that engine in that car will have no trouble with those gears. Of course it isn't a matter of snapping your fingers so I get that.

With 3.73s and assuming a shift rpm of about 5,150 (ballpark), you have some shift stats:

1-2 WOT at around 33 mph
2-3 WOT at around 63 mph
3-4 WOT at around 101 mph

Also, you'd be on the fuel cut at around 155 mph. Which is probably not an issue with the stock LT1. In fact, you'd be at the HP peak around 145 mph which makes 3.73s probably the ideal top speed gear for a stock LT1 in a G-body. FWIW.

Adam wrote:

kevm14 wrote:With no reverse peelouts, no one wheel peels and no neutral drops, I'd imagine that rear would be just fine.

Myself and some people I know have broken several 7.5" axles (usually spider gears) from doing all the above.

I am sure you don't intend to use your swapped Monte like that.

Also fun fact. Look at this:
http://www.competitiondiesel.com/Phil/bg/

Baseline example was a 4,350 lb car (w/ driver) trapping 93. Calculates 260 hp flywheel. That's a stock LT1 B-body, more or less. So if we trust that, then...

Assuming a Monte Carlo SS with no power options is about 3,450 lbs...

And assuming a 200 lb (ahem) driver.

That predicts a 99 mph trap speed. Which is probably good for anywhere between a 14.5 second ET if you really blow the launch, or into a 13.8 if you hook. Call it a 14.0 just to be annoying (so you can't run 13z).

Now what Bill doesn't know is, LT1 drivability is almost as good as it gets. That is a very fun 14.0 @ 99 mph, and the car will be very satisfying on the street. I know because that's about what my 95 Z28 was good for, so I am very familiar with that performance level (albeit with a T56). Granted, 10 years ago, 14.0 @ 99 was still considered somewhat quick but a V6 Accord would give you a very hard fight and may even walk at highway speeds. Same with a V6 Camaro (maybe not walk). But the LT1 will drive way better than those, and actually feel (and sound) fun.

Plus that's just stock. With headers, intake, tuning and maybe a set of 1.6 rockers, you will easily be at an even 300 hp flywheel. Easily. That translates to a 104 mph trap, which means if I miss one shift in my CTS-V, you'll probably edge out in front of me, and the race would probably end before I made that up. Just for reference. And that's just an LT1 with a few bolt-ons.

kevm14 wrote:I did some maths.

With 3.73, 4L60-E and stock 215/65-15 tires, cruising RPMs are:

2,250 rpm @ 65 mph
2,600 rpm @ 75 mph

Drops to
1,850 rpm @ 65 mph
2,150 rpm @ 75 mph

Big difference. And that engine in that car will have no trouble with those gears. Of course it isn't a matter of snapping your fingers so I get that.

Nice. Quoting that RPM earlier also relied on the '80s GM tach being accurate. Which it probably isn't.

kevm14 wrote:And assuming a 200 lb (ahem) driver.

I'm getting there...

kevm14 wrote:Plus that's just stock. With headers, intake, tuning and maybe a set of 1.6 rockers, you will easily be at an even 300 hp flywheel. Easily. That translates to a 104 mph trap, which means if I miss one shift in my CTS-V, you'll probably edge out in front of me, and the race would probably end before I made that up. Just for reference. And that's just an LT1 with a few bolt-ons.

The headers are already on the car, but I may run into issues with emissions testing as they don't currently have a provision for A.I.R. injection. That TSB for air pump removal only applies to '95 and '96 LT1s. Not that it matters if you turn the code off, but may matter for what comes out the tail pipe. I should dig up my most recent emissions test results from the Caprice. I think they were pretty clean (compared to the limit for '94), so it might be OK.

If I keep the headers, I will need to fab in some cats as the current exhaust system doesn't have any.

It will probably get a sewer pipe intake as the Caprice air box/tube probably won't fit w/o modification.

Another thing is making the rest of the gauges work. Which isn't that important right off the bat. Some of the sensors may be the same (coolant, oil pressure) so maybe it won't be too big of an issue.

Adam wrote:The headers are already on the car, but I may run into issues with emissions testing as they don't currently have a provision for A.I.R. injection. That TSB for air pump removal only applies to '95 and '96 LT1s. Not that it matters if you turn the code off, but may matter for what comes out the tail pipe. I should dig up my most recent emissions test results from the Caprice. I think they were pretty clean (compared to the limit for '94), so it might be OK.

If I keep the headers, I will need to fab in some cats as the current exhaust system doesn't have any.

It will probably get a sewer pipe intake as the Caprice air box/tube probably won't fit w/o modification.

If you pretend that the car has a stock engine, you won't have to deal with emissions. If they don't buy that, then I'd concentrate on tailpipe emissions, but that's just my feeling. The only experience I have is with my Caprice which does NOT have a stock exhaust, but does have stock 96 LT1 manifolds and I did plumb my A.I.R. (so tedious) into the manifolds. Except I've capped the system off and disabled it back when I kept having issues with the dyno test. But the point is, it looks fairly OEM in there. Headers never look OEM. Unless you have some kind of rice, but forget that.

You could tell them the engine is from a 1985 Corvette....doesn't look like TPI but no idea how that verification works. Do you need to present a VIN of the donor engine? I just don't know how much a tech would care.