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Engine Mapper's Subaru Tuning Guide

Old 01 May 2012, 08:44 AM
  #1  
EngineMapper @ Group B Motorsport
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Default Engine Mapper's Subaru Tuning Guide

I thought I'd put together some of my technical thoughts and opinions into a bit of a guide for those that would like to use it as a reference. Hopefully it will evolve into something even better with input from others, both non technically able and those that are.

Feel free to PM me regarding various topics that you would like covered and perhaps other ideas and feedback.

Engine Mapper's Subaru Tuning Guide V1.1 can be downloaded here

V1.1 includes:
Fuels and additives
Fuel pumps
Injectors
Fuel pressure regulators
Intercoolers
Dump Valves
Exhausts
Spark plugs
Airbox vs induction kits
Suggested typical upgrade routes
What is engine mapping?
Mapping terminology and what it means

Happy tuning!

Graham

Last edited by EngineMapper @ Group B Motorsport; 01 May 2012 at 11:43 PM.
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Old 01 May 2012, 08:57 AM
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Looks good! Some good info in there!

2006-07 STI has VF43 not 37.
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Old 01 May 2012, 08:57 AM
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Great work mate, have stickied this for you.
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Old 01 May 2012, 09:07 AM
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Nice one Graham, really useful and unbiased information,it's answered a few of my questions too.

Cheers
Grant.
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Old 01 May 2012, 09:48 AM
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Great read Graham.
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Old 01 May 2012, 09:52 AM
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Originally Posted by BrownPantsRacing View Post
Looks good! Some good info in there!

2006-07 STI has VF43 not 37.
Good spot, thank you! I'll change that later. Got a few more bits to add too.

V1.2 I'd like to cover:

Mapping in more detail
Dyno vs Road
Opensource Vs EcuTek
Engine limitations

Graham

Last edited by EngineMapper @ Group B Motorsport; 01 May 2012 at 11:44 PM.
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Old 01 May 2012, 10:00 AM
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Nice easy to read explanation Graham.
I think I have spotted a small omission on page 9 :-
"Firstly if you are sticking with your TMIC, (top mount intercooler),
Exhausts
Exhausts are a fairly simple topic to cover."

There appears to be a section on DVs missing.
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Old 01 May 2012, 10:05 AM
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Originally Posted by Blue by You View Post
Nice easy to read explanation Graham.
I think I have spotted a small omission on page 9 :-
"Firstly if you are sticking with your TMIC, (top mount intercooler),
Exhausts
Exhausts are a fairly simple topic to cover."

There appears to be a section on DVs missing.
Yes, lol, I wrote it a while ago and obviously meant to finish that sentence off, that will be sorted later as that's the section I need to add regarding DVs. Added to the list!

Graham
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Old 01 May 2012, 10:28 AM
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Is very good. Certainly something people new to the Subaru tuning world should read. Answers a lot of the questions that come up time and time again. Great job!
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Old 01 May 2012, 10:54 AM
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Great guide, lots of good info on it
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Old 01 May 2012, 11:33 AM
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'You’ll find that the majority of UK WRXs require 95 RON fuel'

Our UK WRX says SUper Unleaded on the fuel cap. I would sya the majority of UK WRXs require 97RON.
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Old 01 May 2012, 12:47 PM
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Graham thanks very much for taking the time to write your thoughts and opinions down. For those of us who are new to the Subaru scene this info is excellent. Very helpful!!
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Old 01 May 2012, 01:07 PM
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Yeah cheers Graham, great info.
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Old 01 May 2012, 01:52 PM
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Thanks that is so helpful from a Scoobie newbie & someone new to performance cars etc etc etc!
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Old 01 May 2012, 02:46 PM
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thanks Graham, its a good read.
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Old 01 May 2012, 04:18 PM
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Excellent read. Thanks
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Old 01 May 2012, 04:50 PM
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At last, somewhere to send the OPs of "DV/BOV" threads!
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Old 01 May 2012, 05:08 PM
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Originally Posted by joz8968 View Post
At last, somewhere to send the OPs of "DV/BOV" threads!

This is a prime example of where a good resource gives everyone easy access to balanced info & choice

There's a distinct lack of sticky's on sn.
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Old 01 May 2012, 08:25 PM
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Good read Graham ..
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Old 01 May 2012, 08:44 PM
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From your PDF, Graham;

"380cc = 270-280bhp (1993-1996 Impreza WRX)"

Meh, I'll have to settle for 330bhp.
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Old 01 May 2012, 09:00 PM
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Are you saying you have 380cc injectors with a standard fuel pressure regulator and it's running 330bhp?

Graham
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Old 01 May 2012, 09:06 PM
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Originally Posted by EngineMapper @ Group B Motorsport View Post
Are you saying you have 380cc injectors with a standard fuel pressure regulator and it's running 330bhp?

Graham
Yup Standard ECU too.

It did have a standard regulator, when it made 330bhp, still have 380's.

I have a Fuelab regulator now, won it at Scooby Shootout a couple of years ago.

Last edited by mickywrx; 01 May 2012 at 09:08 PM. Reason: typo in bold
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Old 01 May 2012, 09:07 PM
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Originally Posted by mickywrx View Post
Yup Standard ECU too.

It did have a standard regulator, when it made 330bhp, still have 380's.

I have a Fuelab regulator now, won it a Scooby Shootout a couple of years ago.
Never seen that before! They usually max out at just under 300bhp tops. Grey injectors?

Graham
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Old 01 May 2012, 09:09 PM
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Aye, OEM grey injectors.
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Old 01 May 2012, 09:12 PM
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Ok fair enough! Well lets not distract from the point that the average is far less than this on 380cc. I'm wary that a lot of customer perception is based on the forum 'best' results. I.e some poor sod having read your statement will now assume his 380cc injectors will do 330bhp no problem.

You catch my drift!

Graham
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Old 01 May 2012, 09:17 PM
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Agree, see your point.

Said other poor sod will also think their car will do a 12.4s 1/4 mile when it probably wont...
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Old 01 May 2012, 09:22 PM
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Originally Posted by mickywrx View Post
Agree, see your point.

Said other poor sod will also think their car will do a 12.4s 1/4 mile when it probably wont...
true. But yes, although there will always be exceptions to the rule, I am trying to keep the guide as real and average as possible, so those that have their cars modified will not be disappointed by the result.

Graham
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Old 01 May 2012, 09:23 PM
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That's something that I need to talk about actually! Expectations vs results and realistic expectations!

Added to my list!
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Old 01 May 2012, 09:29 PM
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really useful info there answered alot of my questions i dont really want to ask without looking stupid !!!
cheers
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Old 01 May 2012, 09:44 PM
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Originally Posted by EngineMapper @ Group B Motorsport View Post
That's something that I need to talk about actually! Expectations vs results and realistic expectations!

Added to my list!
See, I am useful.

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