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Old 05-25-2005, 05:08 PM   #1
BlackoutWRX
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Join Date: Nov 2004
Chapter/Region: MAIC
Location: Richmond, VA
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2000 94 Infiniti G20
90 S13 Coupe

Default 2.5 into a wrx, run lean?

ok, ive read that you can swap a 2.5 sti block (with sti head gasket) into a wrx with stock heads with no problem at all. now my question is, with the added displacement, how does the engine know to add more fuel to make up for the added air that can now flow into the cylinders? i would think you would end up with a lot more air, but the amount of fuel injected would stay the same. am i correct or horribly off track? how do you tune for this?
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Old 05-26-2005, 12:03 AM   #2
MeshmeZ
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silver

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you need engine management. the block + stock heads works, but you cant just run it off the stock ecu. you might be able to get a reflash for it but i think most people get a utec or something of the sort.
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Old 05-26-2005, 11:17 AM   #3
mistaare
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Quote:
Originally Posted by MeshmeZ
you need engine management. the block + stock heads works, but you cant just run it off the stock ecu. you might be able to get a reflash for it but i think most people get a utec or something of the sort.

is there anyone that runs off the shelf maps for this?
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Old 05-26-2005, 11:42 AM   #4
Jaxx
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no
your looking at
injectors
vf30/34/39
turbo back
uppipe
fuel pump
and reflash/utec

it would be a total waste to use the td04 (too small)
and 550 pink injectors are close to their limit using the (30/34/39) configuration
i would much rather have PE 650s

that said the above configuration will be a kick in the pants

Last edited by Jaxx; 05-26-2005 at 11:48 AM.
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Old 05-26-2005, 05:03 PM   #5
BlackoutWRX
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90 S13 Coupe

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Quote:
Originally Posted by Jaxx

that said the above configuration will be a kick in the pants
thanks for the help guys, and that was the comment i was looking for



i come from a swapped honda background where it almost doesnt feel like its worth the money for a swap because it still feels slow. thanks again guys.
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Old 05-28-2005, 05:59 AM   #6
mykrrrr
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I ran my EJ257 w/STi ver. III heads/intake manifold/etc on the stock ECU and it can run it but it won't be optimal for the amount of extra volume of the 257.

I switched to an Apexi Power FC since that's one of the only forms of EMS available to phase 1.5 motors and she runs pretty well now.

I'm still running small 440cc injectors but the supposedly the JDM FPR is a higher psi than a 'normal' one. I'm running out of injectors on the top end so I'll be putting my adjustable FPR on and tune from there.

You've got the advantage of more EMS options so consider yourself lucky.

-mykr.
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