Anyone worked with the 16196397 yet?

[RobertISaar]

you really don't need to think about the displacement weirdness beyond the initial change to the VE tables.

OBD2 calibrations have their spark tables stored as a cylinder airmass vs RPM table, which doesn't translate directly to MAP vs RPM. so, that route isn't as easy as it could be. you would need to have some idea of what airmass is being calculated throughout the entire RPM and MAP range, which could be done through a lot of datalogging a vehicle that has the engine you want data from. alternatively, assuming you have a calibration and can read out the VE table it contains, you could apply assumed corrections(like 70*F incoming air and 100kPa barometric pressure) and end up with what is essentially a table that displays airmass in a RPM vs MAP format, which you could then figure out where the spark advance tables translate to.... with a spreadsheet, it isn't too bad to calculate, but it does require a very dialed-in VE table to be accurate.

seems like the M62 would be fairly restrictive for the 3500 top-end... 96+ supercharged 3800s use a M90 and their heads don't flow nearly as well as the 3500 heads do. they end up running really small pulleys and push the gen3 and gen5 M90s out of their peak efficiency islands pretty quickly, a 3500 top end with an even smaller blower seems like it would suffer even more unless you're planning on running a fairly low amount of boost.

[Xnke]

Basically, the M62 is roughly equal to a T3-60 trim turbocharger. The M90 is roughly equal to a T04B S-trim turbocharger-but limited to about 12lbs of boost in both cases. Horses for courses. I don't need super-high HP in a truck, but I do like bulk low-RPM torque.

The truck only needs to turn 5000RPM, ever. It's not a race car, but I do use it to haul engine parts/drag cars/general abuse so low-end torque is nice to have. I may use an M90 just because I have 6 on the shelf, but I only have one M62 and it's the long-case version that won't package well. Also, it's got a T-5 transmission in it, and they're only good for about 300ft-lbs before they shatter.

The reason the 3800SC guys are running then out of their efficiency is that they're getting power greedy. The eatons on those engines aren't designed to run at 6000 engine RPM, they were designed to give bulk torque and the sensation of speed and power at 3000RPM, which is where they're still efficient. Significant case reconfiguration is needed to get serious performance out of the GM blowers. The Ford, Jaguar, and Mercedes blowers are a lot better in this regard.

By changing the shape of the case, I was able to go from 600CFM inlet flow, to just over 800CFM, before hitting the limit of the compressor on this M90. Raised inlet 2.4", opened from 65mm to 88mm.









Also made it fit much better in the engine bay. Shortened the nose up to M62-length too, to fit the accessory drive.

That said, if I knew I had the usage of the 2-bar MAP sensor, I'd just chuck a small turbo on it and call it a day. Might hunt down some Syclone badges or something, that'd be pretty awesome.

[RobertISaar]

that's certainly different.

I've patched in 2/3 BAR support for a different mask/PCM, but I just haven't done it yet for the P66 V6 PCM. I think you're only the 3rd or 4th person to ask about it, so it hasn't been a huge priority, but maybe after this weekend, I can see if I can set aside some time to get on it.

[Xnke]

it's been so long since I dabbled in assembly and hex for the 'HC11 I am not sure I could get it back now. Thanks for taking a look at it-I will be ready to fit the engine into the bay in about a month. If boosted support is available by then then I'll just make the headers into a set of turbo headers, it's way easier to do that now than later.

[Xnke]

Definitely gonna go with the M90 blower now. I got to borrow a Frontier M62 and it's just too long to get it on the plenum cover; so I'll be taking the bandsaw to an M90 case soon.

[Xnke]

Any news on 2bar support for this PCM? I have gotten the super chopped down and ready to fit to the intake.

[RobertISaar]

messing around with it now. the oddball 16-bit VE table actually has an advantage here to where I can basically just tack on another table into the positive manifold pressure range without needing to write an airflow multiplier table.