Technical question about bottom mounted turbo set up and other crazy things

[LinkemSuby]

Ok so i like to do things the best way possible and most of the time it's the hardest way of doing it and also somewhat different, so here is what i want to do now to my 94 RS, just wondering if anyone has done it.

Im wanting to 1st move the motor back about 50-60mm for better weight distribution, i realise im going to have to shorten alot of things and mod xmember or maby sump ect

2nd im wanting to mount a garrett GT3582r at the front bottom of the motor to shorten extractor pipes and put on a front facing intake manifold to shorten the intercooler pipes for less lagg and better tuned pipes. Also im wanting to chop and change the intercooler for backways facing intake and exit (top exit and bottom intake on intercooler) and put in a alloy radiator with enough room ether side to run pipeing through the gaps to the intercooler

I know im crazy and its alot of work but especially on a 94 rs just wondering if its been done before and what issues (and how meany) i would expect to come across

[funkytown]

yup it has been done. they moved the radiator to make it work. it was a red rex.. mayve had h8evo number plate or something

[Joker]

some pics i have on file...

[WRXONP]

how well do the turbos oil drains work being below the oil level?

the drain hose would just pool with oil wouldnt it?

[johnny5]

 WRXONP said:

how well do the turbos oil drains work being below the oil level?

the drain hose would just pool with oil wouldnt it?

was thinking that to

[WRXONP]

well i know that if u have the oil drain going into the sump under the oil level it makes the oil return pool which restricts flow heavily which normally results in oil being pushed past the seals

having the turbos lower than the oil level is effectively the same as having the sump fitting below the oil - if not worse because it needs to push the oil against gravity

i cant help but think it will be as smokey as hell

[LinkemSuby]

same, was thinking new oil drain going to the sump but may have same effect. or exturnal oil pump??

[johnny5]

yea well bit hard for gravity to do its job so would have to pump it out or something but Im no expert so wouldnt have clue really

[WRXONP]

just mount it up the top lol - you can have pretty short cooler piping running a twisted turbo with flipped plenum

if u go bottom mount are u making the manifolds and exhaust etc or paying someone?

[sultan]

Just build a 2.5. This all seems like a waste of time to me

[LinkemSuby]

i do plan to do a 2.5 in the future but short on funds to do it right so just doing the things i can do now myself on a limited budget. i had thought about twisted turbo but the bottom mount seems allot better

[LinkemSuby]

most pipeing parts should be able to transfer to the 2.5 also

[LinkemSuby]

 WRXONP said:

if u go bottom mount are u making the manifolds and exhaust etc or paying someone?

i make all the things myself

[Koom]

 johnny5 said:

yea well bit hard for gravity to do its job so would have to pump it out or something but Im no expert so wouldnt have clue really

Scavenge pump. I thought one of the late model subaru's was going to have a factory mounted low mount turbo? Not hard to make a wee sump for the turbo then scavenge pump that up and into the sump. Waste of time in most cases though.

[D-Style]

With that setup up, exhaust plusing would damage the turbo.

[LinkemSuby]

so it would damage a garrett gt3540? isint it about the same extractor length as what a evo would have if i bottom the ej20/25??

[Guest]

 D-Style said:

With that setup up, exhaust plusing would damage the turbo.

Wont pulse with tuned Im guessing?

[Marky]

I can't see removing a couple of inches of pipe making that much noticable difference to response - maybe just chuck an sr20 in it, would be cheaper, less hassle and way more dorifto spec (and less gearbox hungry)

[D-Style]

 evowrx']

[quote name='D-Style said:

With that setup up, exhaust plusing would damage the turbo.

/quote]

Wont pulse with tuned Im guessing?

With the OEM turbo position, you have 4 cyclinders feeding a constant flow of exhaust gas into the turbo. With this setup, you only have 2 cyclinders feeding the turbo. so instead of a "constant" flow, you will have a plused flow. This plusing will hammer the exhaust vanes and well more than likely cause damage.

Think of turning a tap on & off fast and getting the water pipes to knock and bang around.

Tune wont matter. You will proly need to run a cross pipe between the 2 manifolds.

[Joker]

ooh I love the technical explanation! makes some sense now

bwrap brap brap sideways over the habour bridge at 180kph brah!

[funkytown]

 D-Style said:

With the OEM turbo position, you have 4 cyclinders feeding a constant flow of exhaust gas into the turbo.

well this is rubbish!

they all pulse. 2 will just pulse more. 4 pulses and varying runner length can make the individual pulses interfere with each or more or less depending on design / length.

This is why stock manifold makes the car sound like it does, the runner length causes interference!

[Guest]

Was meaning tuned headers...

Might be being thick but I still dont get how it pulses still. The factory set up pulses with the signature sound? Tuned evens it out.

[94 Leone]

All to do with firing order, which then dictates when a cylinder will be on it's exhaust stroke and since cylinders go at different times the exhaust gases exit at different times. But because some are further away from the meeting point they collide at the meeting point(often the uppipe) because of the unequal headers, thus the subaru rumble was born.

[Guest]

 94 Leone said:

All to do with firing order, which then dictates when a cylinder will be on it's exhaust stroke and since cylinders go at different times the exhaust gases exit at different times. But because some are further away from the meeting point they collide at the meeting point(often the uppipe) because of the unequal headers, thus the subaru rumble was born.

Yea we know that was referring to what D-Style meant...

[funkytown]

 LinkemSuby']

will just use tuned extractors with twisted turbo and choped inty to put pipes thru gaps at sides of radiators im going to create also going 2.5 for more torque

what does this even say in english? im assuming a normal twisted set up like we run with upside down FMIC under the headlights???

if thats the case then..

[quote name='D-Style said:

With that setup up, exhaust plusing would damage the turbo.

why?