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Ecu swap

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14 replies to this topic

#1 Cligster

  • LocationBristol

Posted 25 October 2015 - 10:26 PM

Hi All,


I have an 04 fxt2.0 and from what I've read, an 04STI ecu will swap.


my questions are:-


I assume it can be a WRX Sti ecu ?

Will I need the key / immobiliser stuff or will it plug n play

Will I lose my cruise control (no biggie)

I have searched for a 2004 sti ecu (just in case) but I only ever come across 2003-2005....

From what I've read the 04 is the only year it can be done with so I'm wary..

I have a chance of what is advertised as 2003 STI ecu but want to be reasonably sure..


I have the injectors, turbo, TMIC so in theory should be ok? ish maybe ...


Any input gladly appreciated




#2 stants


Posted 26 October 2015 - 09:13 AM

May as well just get an ecutek remap or should be able to get open source like carberry or similar, keep all original features of ecu but obviously more hp &torque better mpg etc,

The sti ecu unless remapped will be set up for jap fuel so I presume will run richer,

#3 Cligster

  • LocationBristol

Posted 26 October 2015 - 11:15 AM

:)Thanks for the reply


It's purely a cost thing. I can go to Bob Rawle as he has a slot for December but that's £550 and a day off work to go to Swindon.

The ECU I'm looking at has already been mapped by Bob and therefore would save me a license fee ;)

Plus it's only £100

My other option is to find a standard ecu and run the stock map. I'm really only looking for around 280-300 BHP anyway as the Foz has 128k on the clock. =@

#4 Blastertrev

  • LocationSunny Cumbria (NOT)

Posted 27 October 2015 - 08:42 AM

A couple of other things you need to consider...

1) If you swap the ECU, you'll need to get it recoded so that the immobiliser works properly, otherwise you'll be going nowhere. That'll likely cost about £100 I guess.

2) A remap gets the best out of your car as it takes into account any variables in YOUR engine, rather than being a "lowest common denominator" factory map that will work on any vehicle. So, getting an ECU mapped for a different car which could have had some different bits on it might not give you quite such a benefit.

3) You can get a remap for less than £550 if you look around, I'm not sure if Duncan from Racedynamix ever goes over to the West Country, but he's about 100 notes cheaper.

May the Foz be with you....

#5 stants


Posted 27 October 2015 - 12:11 PM

Have you Googled 'the engine mapper' he's based down Devon way somewhere, may be worth a look

#6 Cligster

  • LocationBristol

Posted 27 October 2015 - 12:56 PM

Thanks for all the replies, I've spoken to Bob Rawle and booked it in for 1st December now.

Too many if's but's and maybe's with an ECU swap.

Fuel pump arrives tomorrow and she's ready then.


One question that maybe someone could answer is the stock injector rating?

I have read somewhere that they are 500 just wanted clarification

#7 Cligster

  • LocationBristol

Posted 05 January 2016 - 10:57 AM

Forgot to come back with an update ...

Had to use the stock injectors as the ones I bought leaked.

Ended up with 337 hp @ 5757 rpm / 338 lb/ft @ 4544


Happy with that.

#8 t1gger


Posted 05 January 2016 - 03:30 PM

Good figures who mapped it

#9 BansteadStig


Posted 05 January 2016 - 10:04 PM

That's exceptional.

What are the modifications you've done?

#10 yasawas


Posted 05 January 2016 - 10:49 PM

Good power.

Does it deliver it well?

#11 Cligster

  • LocationBristol

Posted 06 January 2016 - 11:21 AM

HI all,


It was mapped by Bob Rawle Develepments (Swindon).

As for power delivery, its like a kick in the pants and pulls hard.

Only issue I have is flooring from very low revs (sub 1500) and holding all the way will occasionally give you a fuel/boost cut.

Driven properly it it's not an issue though.

As for mods.


VF35 Turbo £250 (used)

ebay ram air induction kit £35

ebay Large Bar and plate TMIC £95

Ebay Bug eye STI Y-Splitter (silicone / alloy) £45

Bugeye STI bonnet scoop £65

Silicone inlet pipe £55

Forge BOV £85 (used)

HRC 290 LPH fuel pump £66

Ebay 3" Turbo back decat exhaust £190

Decat turbo up pipe (came with above)

Map £550


At the moment it's running with no bonnet undertray until I can either mod a bugeye STI one or make one


Apart from the pipe sticking out the back (which I may shrink in size yet) and the scoop, you'd never know.

Nice little sleeper

#12 Prodrive3384

  • LocationBelfast

Posted 09 January 2016 - 03:30 PM

Bob is a good mapper has my hawk running 462 bhp and 507 lbs of torq man nos his stuff

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#13 Prodrive3384

  • LocationBelfast

Posted 09 January 2016 - 03:31 PM

He will be mapping my fozzy soon

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#14 BansteadStig


Posted 09 January 2016 - 04:02 PM

I've never heard a bad word said about his work.

He can be tricky to get hold of though I'd heard. That tells a story of its own though!

#15 Prodrive3384

  • LocationBelfast

Posted 09 January 2016 - 05:08 PM

Comes over to us every 10 or 12 weeks it's handy for us as ni has no good mappers

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