i don't see increasing the drive pressure as being a bad thing, it will just help burn the left over fuel and if not cool the exhaust a little.
i am not talking about blowing a ton in there, just a bit to help the turbo light off sooner.

i have some pictures of them by themselves, but i still have to make the housings

 

The reason I said that drive pressure is bad is because drive pressure is what keeps the already burnt air in the cylinders. How much air are you wanting to inject? And when would you have it turned on? Are you going to have some sort of compressor to refill the tank?

Also nice lights! Post your progress pics as you go!

 

Hot exhaust gas boosts turbo better than colder exhaust gas.
Also i doubt your gains if any would make up for the load of a compressor...

 

I never even thought of the exhast temp or compressor load. Those are valid points...

 

It sounds like a good idea until you remember what powers the compressor. If i were you i would just mount the setup and leave the belt(s) off if its rare that you would need it. Every accessory saps power. You can use an AC compressor to adapt to air if you dont want ac and dont want to make custom brackets.

The stock mech. Fan saps about 15hp from what ive read IIRC. Ceramic coating the exhaust will increase spool speed and thus clean up the exhaust sooner.

Exhaust temps are most important inside the engine, changing the temps from the headers or past will affect boost and alter egt sensor reading. Plus compressors are meant for high psi low volume. Id suggest a supercharger versus a air compressor

I understand your goal is to continue combustion on unburnt fuel to increase boost (which would increase fuel combustion..). Just throwing some thoughts out there. Best of luck

Cant wait to see the lights! I am getting ready to test some glass lights out

 

Rhkcommander makes a good point about ceramic coating. Another thing to help clean up the smoke faster is a more efficient turbo. That is night and day difference performance wise.

As for the supercharger idea, that is what I'm going to do. I already have the mount built. Along with that I'm going to add a bigger turbo. It should be a pretty cool setup when its done...

 

i will keep her updated as i go

it's not really temperature that drives the turbo though, it's volume and pressure. the temperature just makes the gasses expand and apply force on the turbine (pressure).
this is why an inter cooler works so nicely more dense cooler air is able to expand more compared to hot air when the end temperature is the same.

it wouldn't be a constant thing, i was thinking about putting it on a switch triggerd by throttle position(ideally on the governor so that if fires when dumping fuel, but i don't want to tear into the ip) or just putting it on a button.

yes, air compressor is needed and i was going to put it on an electric clutch so that parasitic losses are very low. i also plan on running the intake of the compressor into the charge piping so that there is always a little bit of pressure in the tank.

i definitely plan on wrapping the exhaust, not sure if i will go with the ceramic or not. ideally i would do both.

yes continue combustion/ raise drive pressure should make the engine a bit more fuel efficient as long as the compressor doesn't drag it down. maybe i will use the regulated source for my air lockers so that it doesn't use so much air.

glass as in sealed beams?

i plan on getting a brany new gtx bb properly sized for my applications

what boost do you plan on running with the supercharger by itself and what style charger do you plan on running?

 

Sounds like a unique setup man.

As for the the SC, I plan to run the M112 at about 10 psi and there will eventually be a Vgt pushing into it. I plan to after I do a full build run at 30psi total. The Vgt will open the vanes using drive pressure and will close using boost. It will essentially have a dual actuated cylinder controlling the vanes using this method. I think it will be pretty cool and unique...

 

10 psi is nearly a 1.6 pressure ratio so if you hit 18-19 turbo psi you will be loading 30 psi into the engine

 

The turbo would actually only have to push say like 10psi. That is 14.7+12=26.7psia and multiply that by the 1.68 pressure ratio is 44.8psia. Minus 1atmosphere (14.7) and that equals 30.1spi. Which is right about where - want it after my build is done. It'll be cool boost from both the SC and the turbo. I might also add an air-to-water intercooler between the turbo and the SC. I already have an air-to-air intercooler for between the engine and SC. Two stages of cooling will help provide good cool boost and low egts too...

 

it would give the charger more life as well
i'd like to see a inter cooler after the charger but that would be hard to pack in there

maybe stick a temp sensor in the manifold and see just how hot she gets

14.7+10= 24.7/14.7=1.68 pressure ratio of the charger

30psi/1.6pr = 17.8psi of turbo boost

 

You actually have to mulitply by the pressure ratio of what the turbo would be pushing into the SC. I plan on running 10-12psi from the SC. Sorry I miss said in my first post about it then did the math using 12psi. Lol. I also calculated the pressure ratio using 10 and forgot to change it. Man I feel dumb. But anyway, the pressure ratio using 12psi would have been 1.81. Anyway my thought is that the turbo would only be pushing like 18psi even though its boost is being recompressed by the SC and the SC is making 12psi. How do you figure it is making 17.8psi if we don't know what the pressure ratio it is making? The 1.68 ratio is the ratio of the SC at 10psi...

 

well the ratio of the super charger at 10 psi is 1.68 so multiply anything that goes into it by 1.68 and you have the boost in the manifold. (turbo pressure x 1.68 = boost)

if you reverse that equation, boost /1.68 = turbo pressure

so running 1.81pr
30 lbs target / 1.81 = 16.57 of turbo boost

since the sc is a fixed displacement, it's easier to figure as a pr

 

Ah I see what you did. That makes sense. I definitely understood the pressure ratio part but was sure about how you figured the turbo boost. Thank you for explaining.

 

any idea on connecting rod length?
valve diameter?

sent a request into comp, but i am missing a lot of info

and no problem