Here is an interesting approach to turbocharging
10-28-2004, 11:30 PM
#31
Race Car
Good idea. A separate mini oil system in the back of the car.
I like their idea of an oil flow failure warning. Don't forget that. Do you think the oil pump could be tied to the fuel pump's electric connections for simplicity's sake?
I like their idea of an oil flow failure warning. Don't forget that. Do you think the oil pump could be tied to the fuel pump's electric connections for simplicity's sake?
10-28-2004, 11:47 PM
#32
Drifting
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Ok i dont need the antenna dont listen radio where i live anyway since i dont like country music. So i can gut the inside of the rear fender area on the drivers side? What exactly is the "pumpkin"? The oil feed uses a electric pump to draw oil from the motor to the turbo back the motor. This can also be done by using a "box" of sorts to contain a seprate oil supply for the turbo and a pump to run it through it. I assume a transmission cooler would keep the oil cool enough. The electric pumps can be found for under 100$.
The transams use 2.25 inch exhaust pipe from the factory, the return charge pipe is a 2" diameter pipe. I would like to have about 1 foot or so after the turbo to put a muffler on it so it would sound good. SIlicone couplers are also pretty cheap to order i looked at those before for something else. Headers would be great due to the tiny exhause manifolds on my 84 but thats an extra 600$ lol.
I would probably only run 5-6 psi of boost and 10-12 once i found a decent intercooler for cheap to use.
Im suprised there isnt more intrest in this....
The transams use 2.25 inch exhaust pipe from the factory, the return charge pipe is a 2" diameter pipe. I would like to have about 1 foot or so after the turbo to put a muffler on it so it would sound good. SIlicone couplers are also pretty cheap to order i looked at those before for something else. Headers would be great due to the tiny exhause manifolds on my 84 but thats an extra 600$ lol.
I would probably only run 5-6 psi of boost and 10-12 once i found a decent intercooler for cheap to use.
Im suprised there isnt more intrest in this....
10-29-2004, 12:14 AM
#33
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James-man,
That's a good idea to use the fuel pump wiring (to trigger a relay) but what if you hit the rev limiter!? Easy enough to tie into a 'On' circuit at some point to turn on a relay near the battery.
...
Jack,
RE: More interest. With some people it's experience; for the majority it's inexperience.
Gut is a strong word, 'unbolt and remove components' would be a kinder/gentler phrase! The pumpkin is the bulbous factory main muffler.
The turbo acts like a muffler, so you may not need a muffler after it, maybe just a resonator (Monza) twin tip would do, if anything.
I'm no (turbo-)supercharger expert, but I reckon you'll need a blow off valve, and a boost sensitive fuel pressure regulator too.
click pic for Popular Hotrodding article
That's a good idea to use the fuel pump wiring (to trigger a relay) but what if you hit the rev limiter!? Easy enough to tie into a 'On' circuit at some point to turn on a relay near the battery.
...
Jack,
RE: More interest. With some people it's experience; for the majority it's inexperience.
Gut is a strong word, 'unbolt and remove components' would be a kinder/gentler phrase! The pumpkin is the bulbous factory main muffler.
The turbo acts like a muffler, so you may not need a muffler after it, maybe just a resonator (Monza) twin tip would do, if anything.
I'm no (turbo-)supercharger expert, but I reckon you'll need a blow off valve, and a boost sensitive fuel pressure regulator too.
click pic for Popular Hotrodding article
10-29-2004, 01:25 AM
#34
The more I look at the dyno chart the less I like the system. It robs the car of power on the lower end so you will feel the turbo lag. I've noticed that my centrifugal system boosts the power starting at a much lower rpm than this turbo system. I don't think the STS system is optimum for a car with an automatic tranny due to the lag. Maybe a twin turbo system would be worth the effort to reduce the loss of power in the lower rpms? The cost wouldn't seem like it would be that much more since you could share the oil line and plumbing back to the intake.
10-29-2004, 02:41 AM
#36
I spent quite a bit of time on their site looking around. They get the oil supply to the turbo from the oil pressure outlet on the block. The oil is returned to the engine by a seperate 12v pump and routed through an oil fill hole on the valve cover ( on chevys ). I'm not sure where we would return the oil on our cars, but that could be worked out. They also mention that on manual trans applications there is a blow off valve that operates when shifting when the throttle is lifted. On the 16v 928 would a rising rate fuel regulator be the only modification needed with a low boost application? Say 5 p.s.i.?
10-29-2004, 03:55 AM
#37
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Originally Posted by PorKen
Actually though, I wish the battery box was bolted in. I've thought randomly about drilling out the spot welds and making it so.
Seriously though, if you have the mounting bosses already tapped in the side of the tranny then worst case you only need the rear trans cover and the box itself. You may not have the three mounting studs on your back cover. This page has enough details that you can figure out where to look for the bosses and studs. Oh, the battery box cover is a PITA to find, but I imagine you'd just whip out the auto-darkening helmet and have at it. One advantage is that the box is already built like a brick ****house; the heavy rear muffler is normally supported entirely off of the battery box. I doubt that the turbo setup would weigh any more than the muffler...
Originally Posted by PorKen
I'm no (turbo-)supercharger expert, but I reckon you'll need a blow off valve, and a boost sensitive fuel pressure regulator too.
I have somewhat the same concern as Jim, since I see that (in the example application) the power was at least equal to stock by about 2650 RPM.
Obviously my car would differ, but looking at this I think that I would lose something important to me. If you extrapolate the curves to 1500 RPM, performance looks to be 50% less than stock or worse. It wouldn't matter during "spirited" driving, but that grunt down between 1000-2500rpm is something I would sorely miss in daily driving.
I'm intrigued by all of the forced induction solutions, but it's going to be minimum 1 year before I could think of pulling the trigger. Other priorities & such. Still, it's fascinating watching the 928 FI scene grow.
10-29-2004, 05:52 AM
#38
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The website says that boost sets in "hard" around 3000 rpm. If you want boost at lower rpm, you'd probably have to install a second, much smaller turbo that spools up much earlier. Then a complicated flap system could manage the forced air from whichever turbo provides the right or most amount of pressure.
Either way, it makes no sense to me to have the turbo so far away from the engine. It will lag in spooling up and lag in pressurizing the intake - exactly the opposite of what a modern turbo engine should do.
Weird stuff...
Either way, it makes no sense to me to have the turbo so far away from the engine. It will lag in spooling up and lag in pressurizing the intake - exactly the opposite of what a modern turbo engine should do.
Weird stuff...
10-29-2004, 12:57 PM
#39
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This "lag" is easily solved by a 50 shot or so of nitrous... A 25 shot would probably work to. Just hit it in first gear and boom no lag. Snowmobiles use turbos mounted in the rear.... Even a plane had a rear mounted turbo with the engine in the front.... A v8 engine will lag unless you use a turbo that runs out of boost at 5k rpms or 2 turbos. Supras that use single turbos dont come on boost untill about 3000-3500 rpms...
10-29-2004, 05:55 PM
#41
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Sharkskin,
I'd do it, if I could get someone to TIG weld close the drilled holes. I would use an Optima battery and relocate to the back seat or on the floor behind the passenger seat.
The power seems to come on about the same spot as a stock 928, so it would come on a lot harder, but still be a pig at low engine speeds.
...
Jack,
Get one of those anti-lag kits that ignite gas in the exhaust pipe to quickly spool up the turbo. Cool flames out the exhaust too!
I'd do it, if I could get someone to TIG weld close the drilled holes. I would use an Optima battery and relocate to the back seat or on the floor behind the passenger seat.
The power seems to come on about the same spot as a stock 928, so it would come on a lot harder, but still be a pig at low engine speeds.
...
Jack,
Get one of those anti-lag kits that ignite gas in the exhaust pipe to quickly spool up the turbo. Cool flames out the exhaust too!
10-29-2004, 08:08 PM
#42
Drifting
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Porken you mean a BOOM BOOM anitlag turbo kit haha those are sweet. I bet i could do it with a spark plug lol. They use those on rally cars but i read they are bad for production cars, cant handle the boost like that. Something about the gas igniting inside the turbo instead of the motor....
08-12-2009, 08:19 PM
#45
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Look at the torque boost at 7psi , its enormous , who said it was worse than stock ? what rubbish ,its torque what you want , nice & flat , I would say that it was working very well , would love to see what can be done on the dyno , who wants to buy one in australia & let me have a play . I have enough pet projects .