TURBOs!?

[bazza]

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[BRZCory]

Woah woah woah... let's keep the personal attacks to a minimum.

Just the facts maam.

[TomsSVX]

+...............

[TomsSVX]

Seriously... bazza, harvey, and bob... if you want to take shots at eachother find another medium. There is good info here i dont want to close this or start pulling posts

Tom

[BackWoodsBob]

Originally Posted by bazza

Again as I said, you have absolutely no idea about tuning.

I never claimed to know a lot about tuning. Which is why I plan on using the stage 2 chip until I educate myself on burning Eprom chips specific to my car and modifications.

[BackWoodsBob]

Originally Posted by icingdeath88

500 hp is unrealistic for one of LAN's stage 2 chips. The 370cc injectors ought to max out at (recalling from memory here) just under 400 hp. Maybe can squeeze out a bit more if you bump up the pressure with an adjustable FPR.

The stage 3 chip used two MAFs and 550cc injectors and could do 500 hp probably.

But you are definitely better off going with a standalone, that is tuned for the specific engine/setup you have. Much safer to run it that way too.

Ahhh Thank you, now this is a helpful post. See, now I'm enlightened.

[BackWoodsBob]

So Harvey, your recommendation is to either.

1. Run twin turbos.
2. Run separate pipes to the turbo then merge at the turbo flange.

Do I understand you correctly?

[oab_au]

Cheers Harvey.

[oab_au]

Originally Posted by BackWoodsBob

So Harvey, your recommendation is to either.

1. Run twin turbos.
2. Run separate pipes to the turbo then merge at the turbo flange.

Do I understand you correctly?

For a remote mount, you need to keep as much energy in the gas as possible. So I would use the same diameter engine pipes for at least 24", then join them with a Y piece to the same diameter pipe down to the tubine.
This will increase the gas velocity, and help to prevent any expansion that will loose gas temp.
Then wrap the whole exhaust in insulating materal.

Harvey.

[bazza]

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[BackWoodsBob]

Originally Posted by oab_au

For a remote mount, you need to keep as much energy in the gas as possible. So I would use the same diameter engine pipes for at least 24", then join them with a Y piece to the same diameter pipe down to the tubine.
This will increase the gas velocity, and help to prevent any expansion that will loose gas temp.
Then wrap the whole exhaust in insulating materal.

Harvey.

Thank you very much. I guess I misunderstood when you were talking about the exhaust gases not being evacuated quickly enough due to pressure.

Now I need to learn how to tune our ECU and burn Eprom chips. Time to go to the electrical section!

[Tapani]

Guys,

This is all very interesting.... mine is a low boost setup running 5 PSI at the moment, no intercooling.

Torque curve is the same shape as stock, pulls well upto 5500 rpm and then tapers off.

The turbo is a old non-cooled T4/T3 hybrid and driveability is excellent - you wouldn't even know it's blown... performance is effortless rather than explosive and suits the SVX chracteristics well. The engine was turbo charged already in 2000.

You with blown EG33s - have you measured your exhaust pressure against boost? I know my turbo is small and am wondering if the expansion side is too restrictive.

From my side this is all just general interest at this point - I will go for E85 prior doing anything else, then a water to air IC.

There's a ton of info available on the net, though.

http://www.hotrod.com/pitstop/hrdp_1...arged_engines/

Check out the table especially.

http://www.carcraft.com/techarticles...e/viewall.html

Kind regards,

Tapani

PS Has anyone considered a single twinscroll?

[oab_au]

Originally Posted by Tapani

Guys,

This is all very interesting.... mine is a low boost setup running 5 PSI at the moment, no intercooling.

Torque curve is the same shape as stock, pulls well upto 5500 rpm and then tapers off.

The turbo is a old non-cooled T4/T3 hybrid and driveability is excellent - you wouldn't even know it's blown... performance is effortless rather than explosive and suits the SVX chracteristics well. The engine was turbo charged already in 2000.

You with blown EG33s - have you measured your exhaust pressure against boost? I know my turbo is small and am wondering if the expansion side is too restrictive.

From my side this is all just general interest at this point - I will go for E85 prior doing anything else, then a water to air IC.

There's a ton of info available on the net, though.

http://www.hotrod.com/pitstop/hrdp_1...arged_engines/

Check out the table especially.

http://www.carcraft.com/techarticles...e/viewall.html

Kind regards,

Tapani

PS Has anyone considered a single twinscroll?

Tapani your set-up is a good set for the road going SVX. The exhaust pressure interfering with the inlet is increased with the boost pressure. The type of header connecting that will give this trouble is like this one.



You can see how short the path from one side to the other is.

Those articles are good, they talk about the way overlap is not needed on a turboed engine, and the problem with the exhaust pressure, and I agree.

Using a twinscroll will solve the interferance, as the two pipes don't join, and can be fitted closer to the manifold, giveing more energy to the turbine.

Harvey.

[Tapani]

Well, mine is of the same type:

http://www.subaru-svx.net/forum/atta...8&d=1332441421

Also, the carcraft article talks about how cam designs vary with the characteristics of the selected turbo (and the complete setup).... If I understood correctly modern setups may run with a very low exhaust/boost pressure ratio - below 1 while mine is probably 2-2,5... with that kind of set up the cam design may approach the NA world and go beyond (increasing the exhaust duration and even tightening the LSA).

At some point I will go and talk to the shops and try to find out how my set up would change with a state of the art turbo (at the same location) while maintaining the low boost level and stock engine.

Interesting and I think there may be quite a bit potential to extend the torque to the high end of the stock rev range w/o affecting the current sweet area just by swapping the turbo to a more modern one.

Any comments?

Kind regards,

Tapani

[oab_au]

Yours is not as short as that one, and running less boost, may not be as affected.
Yes, I am sure that the system can be improved to just increase the torque, across the rev range, that the road car uses.

Your got the transmission for it.

Harvey.