killav

I wouldn't want to drive through a flooded street, but my car only sees rain on occasion when I am caught out in it. I know the Pac NW guys have been running this set up for at least a couple of years or more, and it rains a lot there. I will let them chime in, but as far as I know, they had no issues. It is hard to see in the pictures, but there is a pre-filter sock over the air filter to help protect from road spray when raining.

anonymousagain

Great progress Mike!! Clean wrap on the exhaust and what looks to be an excellent fit with components, especially the piping routes in stock location. Very nice.

I'm sure you'll fire it with the direct filter connect, but for consideration, there is a large cavity in the rear bumper facia area that is perfect for the inlet and filter. Not too difficult to plumb with some flex hose since only pulling air. It'll make the element stay cleaner longer and provide cooler incoming temp on warmer days since away from the asphalt. You likely already saw it if looking up past the fuel filter/tank while changing out the fuel filter. Just a consideration.

Oh and always take a sick day when you're this close to completion

Iwanna928

Awesome looking setup! I have been looking at STS for a few years. I was thinking of compound boosting my Thunderbird SC before it was stolen. I would have been so cool to hear that blower whine and the Turbo as it passed by! Oh well, I wouldn't be driving my 928 if it wasn't taken.

That is going to be sick. I need to do my heads, gaskets, MM etc and then she will be ready for one of those. I can't wait to see and hear that baby!

dprantl

Compound boost S/C and rear turbo... hmm....

Dan
'91 928GT S/C 475hp/460lb.ft

ptuomov

Bolting on a big-*** rear turbo would make sense with low compression and positive-displacement supercharger. With high compression and centrifugal supercharger not so much.

dprantl

Well.. it's a good thing I have an M112 then. If others are running around with 10:1 and over 12psi boost, then it's low enough

Dan
'91 928GT S/C 475hp/460lb.ft

ptuomov

I've got 9.4:1 and over 6000 rpm 18 psi is not a problem.

Iwanna928

18 psi Now we are talking! After playing w/ my SC and turning up the boost it was awesome. I understand why people buy a system and add 5 to 6 psi. I on the other hand feel that things start to be fun after 15psi! That is just me. I am not trying to disregard anyone's efforts or boost numbers! But at my age, 50 on the 27th of this month, life begins at 15 to 20 psi, after that I might end up in a big hole!

I have been trying to get in touch with a gentleman on the forum that was building a SC setup for a M112 on a 4.5. I would really love to go that route and add a turbo later but it looks like I will be just going the turbo route!

89 928 turbo

Sweet, Mike

You've done a great job pulling this together. Looking forward to your dyno numbers....

ptuomov

Let's just remember that it's not boost that counts, it's the average horsepower over the power band. I'd much rather make the same hp with lower boost, for a long list of reasons.

Iwanna928

No doubt Toumo. You turned up the boost on your car to make big numbers. I feel 15 to 20psi is a safe target given a proper tune and IC system. Problem with CIS among others is a fueling issue. If the system isn't reworked, money, then you can't really take advantage of the low compression as 12psi seems to be the limit. That maybe to much for some K-Jet systems. Like on mine. I don't feel that I could fuel enough for that much boost given the setting on my last tune. Didn't seem like a lot was left in the tank!

Running less boost and being more effiecient is a odvious goal when setting a boosted motor. What do we do when we acheive that, we turn up the boost, add more fuel and a proper tune to see how much the motor can acheive while staying safe enough not to blow the damm thing. You proved that and have done a awesome job!

Can't wait to see what numbers are acheived here on this remote turbo. A lot of people seem to boo hoo them but they can make some serious numbers and are simpler to install on tight engine bay's that require some fancy custom work that some people just can't afford!

AO

Yep... Unfortunately, AFAIK DynoJet doesn't let you calculate avg horsepower or the area under the curve. Anyone know how to do this?

Mike made 280RWHP as his baseline. My guess is with a 5psi system, he'll see somewhere around an additional 90 to 100RWHP. So his follow up dyno should show about 370 to 380 - assuming he's got a decent tune.

Being non-intercooled may or may not affect things. It's a low enought charge that hopefully it won't exacerbate detonation, but with the added heat from the turbo there's a chance it could. I know the long run from the rear gives the charge a chance to cool - just not sure how effective that is.

AO

Mike-

One thing you might want to do that will save you some aggrivation is to pressureise the entire intake to check for leaks. What I, and others, do is to get a PVC end cap and a rubber coupler that will fit your intake diameter. Tap the PVC to take a quick connect from teh air compressor. You might want to fit a cheap regulator or add a pressure gauge to monitor.

Once you hook it all up, turn your compressor down to about 10psi and hook it up. Listen for leaks along the entire path. and fix as needed. There will be some hissing around the thottle body - normal. You're looking for big leaks.

Hope this helps you.

Cosmo Kramer

So did you get this baby fired up yet or what!

Iwanna928

A lot of rear turbo guy's are running methonal system's so they can turn up the boost and make bigger numbers. System's are cheaper than trying to have someone build a custom IC setup. Might not be a bad way to go. You could always buy the system, start saving for the IC setup you want, and when you are ready to hook her up you could take the system off and sell it to recoup some cash. Or you could keep it and use both!