Dumb question but...

[u/chrisdaewe]

I found a b235r motor 2,3 areo from 2002 is it worth it putting it in my mk1 9-3 from 1998?

[u/OB1182]

Yes.

^{This is not financial advise.}

[u/chrisdaewe → u/OB1182]

It was born as a 2,0t

[u/vilius_m_lt → u/chrisdaewe]

You will need to reprogram your ECU with a B235 calibration but yeah, I’ve done it back in the day. It’s the same block except for crank and connecting rods

[u/amazinjoey → u/vilius_m_lt]

He needs new wiring for engine harness AND Interior. Both for Miu and sid

[u/vilius_m_lt → u/amazinjoey]

No he doesn’t

[u/amazinjoey → u/vilius_m_lt]

Yes he does, It communicates via P bus which is missing on the 98 9-3. Same for the SID...

98 9-3 uses trionic 5

9-5 and the b235 uses trionic 7

[u/vilius_m_lt → u/amazinjoey]

Nope. He’s just changing the motor, not entire system. T5 is capable of running b235 motor. MIU and SID has absolutely nothing to do with it

[u/amazinjoey → u/vilius_m_lt]

No it's, it has A COMPLETLY DIFFERENT Manifold, throttle body as b2x4 has a mechanical one, sensor etc.

Yes it does because you CANT put B235 calibration on a T5. Those calibration are for T7 and won't flash over. And he can't T7 convert as need completly different electrionics

[u/vilius_m_lt → u/amazinjoey]

A t5 2.3 calibration will work fine with a b235 block. T5 is way easier to make changes to with t5 suite too, so that’s really not an issue. Yes, manifold is different, I would probably swap the head, since t5 cams are better anyway, if I was in his position. Then again I wouldn’t ask these questions before doing that anyway.. there is plenty of info available as it is, I had no issues doing any of my swaps - auto to manual, 2.0 to 2.3, etc

[u/theclassic900]

I think that would basically make it a Viggen? You’d have the same issue as the actual Viggen — rigidity and torque steer. Fun project, worth it. But prepare to make a lot of other upgrades.

[u/Low_Emotion_4797]

If you're willing to do it , it's a great upgrade but why not go the whole hog and get a stage 1 maptun upgrade to start with and see how it feels.the power difference will scare you😉

[u/amazinjoey]

No it's not worth the effort, you will need to use T7 ECU which requires new harness, electrical for Miu and SID.