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Old 02-08-2012, 07:18 PM   #1
Steel_pounder
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Location: Boise Idaho
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02 wrx
red

Default 2.1l build, stock everything else

So I have been reading everything I can on here abot 2.1 strokers and have a few questions.

is it possible to run this engine with everthing stock but the shortblock? IE... turbo, manifold, injectors, ecm etc. I realise that I won't likely see any performance gains at this point and plan on upgrading later but this car has been down a long time and I need it running.

is an access port going to be better than a turbo xs for tuning?

What would be the best MT? 07 6 speed.
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Old 02-08-2012, 08:27 PM   #2
SomDong
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You will see gains, lower end torque.

The powerband will shift to the left.

And A/P will suffice. And 6 spd is always a good thing over a USDM 5spd.
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Old 02-08-2012, 09:04 PM   #3
Steel_pounder
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thanks for the reply. Will I need the AP right off to compensate for the greater displacement or will the stock ecm do for breakin?
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Old 02-09-2012, 01:26 AM   #4
mattxander12
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busted.

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I'll jump in and say you'll need either a break in tune using either an AP or an Open Source tune. Your stock ECU map will be expecting 2.0L and not 2.1L and could cause problems.
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Old 02-09-2012, 12:09 PM   #5
brutnus
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Use whatever software the tuner recommends. You want to use what the tuner is used to. Generally its an AP, opensource or standalone application. There quite a few vendors that do the 2.1L and give great advice.
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Old 02-09-2012, 12:19 PM   #6
SomDong
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The best thing to do is speak to the tuner like everyone said. They've probably done it before and will have a map for break-in etc.
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Old 02-09-2012, 04:19 PM   #7
Steel_pounder
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I know of no tuners here in the treasure valley. I asked a few of the subie owner's I have talked to and pretty much got there's not one. I was thinking of getting an AP and a Dom Tune. Just didn't know if I was gonna need it with everything stock but the shortblock.
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Old 02-09-2012, 04:25 PM   #8
NW2TONE
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If you get the ap we can email you basemaps so you can drive your car to here (mps) and get it tuned.
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Old 02-09-2012, 07:20 PM   #9
Steel_pounder
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Thanks, this is the way I am leaning. Just trying to find out if I can go stock or if I should just bite the bullet now and put in injectors, fp, 16g or 18g etc.

Quote:
Originally Posted by NW2TONE View Post
If you get the ap we can email you basemaps so you can drive your car to here (mps) and get it tuned.
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Old 02-09-2012, 07:47 PM   #10
bzoli
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Tune would be required to when ecm goes open loop, that is clear - so some kind of engine management is needed. But can the stock ecm handle closed loop tasks? Idle, cruising, cold start without a problem?
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Old 02-09-2012, 08:11 PM   #11
Nuke209
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Quote:
Originally Posted by bzoli View Post
Tune would be required to when ecm goes open loop, that is clear - so some kind of engine management is needed. But can the stock ecm handle closed loop tasks? Idle, cruising, cold start without a problem?
Shouldn't have any problems with the stock ecu at all.
As long as your tuner knows what he/she is doing, you should be fine.

and yes the stock ecu can handle closed loop tasks
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Old 02-10-2012, 11:37 PM   #12
Steel_pounder
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thanks guys. I think I am going to go with the AP and a internet breakin tune from MPS. Then drive the car over and have Dom and his team tune it right after I have the break in done. the 600ish mile road trip being the last part of the breakin. just picked up an 18g and plan on ordering injectors next.
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Old 01-29-2013, 02:07 AM   #13
AK-Saabaru
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Steel,

Did you every run your 2.1L with the stock turbo and injectors or did you just go for a turbo upgrade? I'm at that same point in my build - wanting to keep the stock turbo for a while that is.

--Patrick
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