EJ20T into Porsche 911 Conversion (Cooling / Sump / Clearance)

hugofirst · 2006-08-23T00:48:40+00:00

Hey all, Im new to the forum and am looking at doing an EJ20T conversion into an older Porsche 911 (GASP!!!!) Don't hate me cos its a Porsche! I've found the VW guys are Heaps more willing to help out than other Porsche buffs (who just look down their nose at you!) My first question is about cooling - What do you guys with EJ20's do with cooling in a Beetle??? Do you mount the radiator up front somehow?? or squeeze it in the rear end?? or what!?? (Photos would be GREAT!!!) I think being a Porsche, theirs a fair bit more room up front behind the front bumper, and would make the engine bay a heap neater... So I'd prefer to mount it up front if possible... Second question: Do you have to modify the oil sump to get more ground clearance??? Third question: Does the intake or Turbo foul on the firewall?? Is their much cutting & deforming of the firewall to get everything to fit???? Lastly, do you guys know if anyone here in Oz have actually done this conversion in a 911?? Thanks heaps.. I've already learnt heaps from flicking through this forum! keep it up! :thumb [ Edited on 23-8-2006 by Baja Wes ]

boof2332 Custom Title Time!

1,210 posts · joined May 2004 · 25 Aug 2006, 8:40 am

#526480

Thats pretty much stock.... change a few things and turn up boost and up goes torque... I love torque and turbos. You would be looking more like 400nm, with the mods you cant help making.

Matt

Baja Wes V6 Baja Pioneer

3,119 posts · joined Aug 2002 · 25 Aug 2006, 8:49 am

#526482

hugofirst wrote:"The Porsche 911 model 915 transaxle can handle reasonable (360 ft/lbs) gross torque from a modified V8"..... Whats the EJ20T put out??

I don't know where others are getting their torque figures from, but I thought Subaru would be a good source. Check the table on page 3, and the graph on page 15 of this pdf;
http://www.surrealmirage.com/subaru/files/SAE_boxer.pdf

So Subaru say 27.5 kgf.m,
which is about 270Nm of torque,
which is about 200ft.lbs of torque.

so if the Porsche box can handle 360ft.lbs then it will handle the 200ft.lbs from the EJ20t no problems. Plenty of room for more boost even.

Wes - www.offroadvw.net - 200HP Quad Cam V6 in a VW Baja - with climate control... 🙂
www.taylorcycles.com.au - My DH MTB racing brothers shop.

VWCOOL 23 Windows of Awesome

5,158 posts · joined Jun 2003 · 25 Aug 2006, 8:56 am

#526483

My 320Nm figure came from Subaru media site. That's at 3600rpm, for the current-generation cars. Older cars will no doubt have less twist. STi has 392Nm at 4000rpm.

From past experience 😉 don't be tempted to fiddle with any '207kW upgrades' to the standard ECU (required for legal rego/engineering) as the shorter exhaust will only cause problems with boost spikes etc

You will have a road rocket!

[ Edited on 24-8-2006 by VWCOOL ]

Pay your debts, CxxT

boof2332 Custom Title Time!

1,210 posts · joined May 2004 · 27 Aug 2006, 10:29 am

#527117

Why will a shorter exhaust effect/cause boost spike. It will cause it to lean out, although that depends on what you do with the air going in and where your bov plumbs back. Boost spike is often caused by the boost controller, as it tricks the wastegate and thus its progressive opening is left till later and the wastegate may not respond quick enough at the final setting to control boost to your setting. Just putting a controller on, without turning it up, will make the turbo spool up harder and faster.

Matt

hugofirst Learner Dubber

12 posts · joined Aug 2006 · 28 Aug 2006, 8:46 am

#527435

Ok, I'd made up my mind to go with a 915, and then I just found a G50 4-speed going cheap.. ($2500). Came out of a running 930, but I can't test it etc... so MAY need a rebuild.. (Im guessing a rebuild would be big $$$)

Ricola - You said the 915's aren't the quickest shifts in the world.. Does anyone know what the G50's are like?? (out of an 85 930)...

I know its only 4 speed, but just weighing up whether it would be better to get this cheap and rebuild it (if it needs it) so I know what i've got - or go for a 915 5-speed... (Slower shifting - more $$$ - weaker?)

Thanks again people! :thumb

malcolm Insano Dub Head

812 posts · joined Nov 2004 · 28 Aug 2006, 12:28 pm

#527483

you can buy short shift kits for the 915 box they range from $200 to $900 for the wevo.
What motor are you going with .

[ Edited on 28-8-2006 by malcolm ]

Baja Wes V6 Baja Pioneer

3,119 posts · joined Aug 2002 · 28 Aug 2006, 12:31 pm

#527485

I think a second hand G50 that may need a rebuild would be opening a can of worms. It could get very expensive.

Wes - www.offroadvw.net - 200HP Quad Cam V6 in a VW Baja - with climate control... 🙂
www.taylorcycles.com.au - My DH MTB racing brothers shop.

reub VWRX is gone...

2,054 posts · joined Sep 2002 · 28 Aug 2006, 4:03 pm

#527538

You're right Wes.

I think I need to pull the box out of mine due to a whine and growl in the box - which I think signifies an input shaft bearing on the way out, at the least, who knows.

I'm seriously dreading the dollars that may be involved to be honest.

Easier not to drive the car much for now....

Reub

ricola Wolfsburg Wizard

437 posts · joined Feb 2003 · 28 Aug 2006, 7:19 pm

#527609

hugofirst wrote:Ricola - You said the 915's aren't the quickest shifts in the world.. Does anyone know what the G50's are like?? (out of an 85 930)...

915s have a slower shift due to using Porsche's own design for the synchro, nothing to do with the throw, they just don't like being shifted quickly and a quick shift can do more damage as it just forces the situation. Having said all that, they aren't THAT bad, I used one in my speedster daily and nobody seems to complain about them in the old 911 RS. Just don't expect perfect 0-100 times without premature aging..

I've used a G50 and they shift like a more modern box, nice and snickety. Given the choice from scratch, I'd go built 1303 AT or G50, but for a 911 if the right donor car comes along with good 915 I'd stick with it, clutches are a lot cheaper than G50 ones too.

Whatever the box, I'd be reluctant to buy one with uncertain history as you are bound to end up paying the same again rebuilding it..

Rich

http://www.ricola.co.uk