Vr4 to evo2 conversion

[r29]

Hi all,

I just recently put a evo 2 engine in my vr4. Some of the mounts are slightly different put that will not pose to much of a problem.

I have only used the evo 2 long block and used the vr4 intake manifolds, ecu, afm, crank angle senor, etc. Has anyone done this before? as i am having troubles getting it started

 

[brisvr4]

How did you use the evo head with a VR4 intake manifold? The VR4 ports are much larger than the Evo ports.
Did you move the engine mounts at the rear of the motor and near the radiator? On an evo both of these mounts are on the box and not on the block?

 

[Muzz66]

I would be verifying you actually have a EVo 2 motor.doesnt sound right to me. :blink:

 

[r29]

How did you use the evo head with a VR4 intake manifold? The VR4 ports are much larger than the Evo ports.
Did you move the engine mounts at the rear of the motor and near the radiator? On an evo both of these mounts are on the box and not on the block?

I haven't actually looked at the size of the ports i didn't realise that thanks. As for the mounts the back one bolts up to the block and i am currently making a front one that is to bolt up to the gear box

 

[r29]

I would be verifying you actually have a EVo 2 motor.doesnt sound right to me. :blink:

Yes i have an evo 2 motor and have put in in my 88 gallant vr4

 

[Entaran]

Engines need three things to start. Fuel, Spark and Air.

Which ones are you missing?

Are the plugs completely fouled?

 

[Dean]

Put your location in your User CP too mate as per forum rules,
maybe someone in th area can come around and give you a hand.

 

[r29]

Spark is there and the plugs are not fouling. There is a pulse at the injectors and the fuel pressure is holding well. I believe there is air there too. What might be happening is there is an initial pulse but due to some other reason the ecu may be weakening the pulse or possibly stopping it when trying to fire the engine.

 

[VR-4Squid]

Engines need three things to start. Fuel, Spark and Air.

Which ones are you missing?

Are the plugs completely fouled?

You forgot compression

what ecu are you going to run it with? the evo's got higher compression (8.5:1 vs 7.8:1) so the vr4 ecu won't have the right ignition mapping (too advanced) and the evo ecu will require some mucking about with the loom plugs to fit.

 

[milkandoj]

If he's got an evo motor and vr4 ecu, wont there need to be some rewiring of the CAS and something else also for the vr4 ecu to run it. Same idea, just around the other way as running an evo ecu in a vr4.

I want to ask why you would bother putting an evo motor in a vr4, even if you did blow the old motor up, but you are at the final stages of getting it running.

 

[Jonson]

and you forgot timing.
Fuel, spark, air, compression and timing is what is needed. Check each one of these.

 

[MDK87]

and you forgot timing.
Fuel, spark, air, compression and timing is what is needed. Check each one of these.

Do you mean valve timing Jonson?
How would you check that?

 

[r29]

You forgot compression

what ecu are you going to run it with? the evo's got higher compression (8.5:1 vs 7.8:1) so the vr4 ecu won't have the right ignition mapping (too advanced) and the evo ecu will require some mucking about with the loom plugs to fit.

So having the different compression will that mean it wont start at all? or will it start but run crappy?

 

[r29]

If he's got an evo motor and vr4 ecu, wont there need to be some rewiring of the CAS and something else also for the vr4 ecu to run it. Same idea, just around the other way as running an evo ecu in a vr4.

I want to ask why you would bother putting an evo motor in a vr4, even if you did blow the old motor up, but you are at the final stages of getting it running.

I had an evo motor offered to me for a good price an couldnt find a vr4 motor at the time or rebuild my old one for the same price. I thought being so similar that it would not cause too many troubles

 

[VR-4Squid]

So having the different compression will that mean it wont start at all? or will it start but run crappy?

I'll run provided you swap the cas as someone else mentioned, but it'll have too much ignition timing advance, so it'll detonate and eventually crack a ring land. You could retard the base timing, but then it'll run crappy off boost.

and yes I did forget you need fuel, air, compression and spark at the right time

 

[to4garret]

got an evo motor and vr4 ecu, wont there need to be some rewiring of the CAS and something else also for the vr4 ecu to run it.

this

 

[r29]

I'll run provided you swap the cas as someone else mentioned, but it'll have too much ignition timing advance, so it'll detonate and eventually crack a ring land. You could retard the base timing, but then it'll run crappy off boost.

and yes I did forget you need fuel, air, compression and spark at the right time

I have bolted on the vr4 CAS sensor. Do i need to use the Vr4 one?

 

[r29]

sorry meant to say evo 2 one

 

[VR-4Squid]

sorry meant to say evo 2 one

the cas needs to match the ecu your using.

if you run the vr4 ecu, you'll blow it up, therefore you need to use the evo cas and wire in some different plugs so you can use an evo ecu.

 

[r29]

the cas needs to match the ecu your using.

if you run the vr4 ecu, you'll blow it up, therefore you need to use the evo cas and wire in some different plugs so you can use an evo ecu.

Just to clarify i was planning to use the existing vr4 cas sensor and vr4 ecu