Jbrake87

Looking for advice please people.
I am just about to buy a fully forged 2.5 engine with Avcs removed from a spec c built by Andy Forrest.
Also buying the ecu, complete loom and harness, inlet and throttle body.

Anyone on here completed this transplant before?! If so...
With the bits I have bought what is the work evolved, I'm guessing the most difficult task will be incorporating the loom with my current loom for the lights, dash etc.
any advice and tips will be hugely apriciated. Thanks in advance.

jura11

iTrader: (7)

Hi there

Everything is possible

You can use existing loom and you will need AVCS/VVT-i loom which I think Tim@JT Innovation doing or selling,this loom cost around £160,then ECU,I would go route of Syvecs S6 or AlcaTek(on this ECU you will need add extra for AVCS control,please speak with yours mapper or AlcaTek dealer),not sure if I would go down the route of full loom,because you don't need,but if you want to use DBW then I would go down the route of Syvecs S6 and DBW bridge,with this you should be able to run DBW on yours without the replacing full loom

I've seen numerous GC8 cars which run AVCS and yes is possible

Hope this helps

Thanks,Jura

Jbrake87

Thank you for the reply,

Could you explain what dbw is and why do I need a separate map for Avcs??

jura11

iTrader: (7)

Hi there

DBW is Drive By Wire and usually if you want to use 2.5L Inlet manifold and their throttle body,then you will have DBW which is not controlled like usual TB via cable or is not cable operated TB,but is electronically controlled TB

Here is the picture how it looks



You need for sure separate map for AVCS,just due characteristic of AVCS is different to non AVCS cams and plus yours cams will be in retarded position without the controlling them

Thanks,Jura

Jbrake87

But I'm buying compete engine so cams will be suited to the Avcs??

Why's the easiest was to add the dbw, or a way around it?
Really appreciate your input

jura11

iTrader: (7)

I would assume,engine which you are buying have 2.5L heads or have AVCS from yours description,then you have AVCS and yes yours cam are AVCS if heads are AVCS,I would assume at least

How to say,you will need to control AVCS,without the ECU which can control AVCS,yours cams will be running in retarded position,due this you want to use ECU which can control AVCS

Depends,but easiest way how to add DBW is to use Syvecs with DBW bridge or you can try to fit full engine loom from new age 2.5L or if you don't want to use DBW then I would fit new age intake manifold(01-05 STI)

Thanks,Jura

Jbrake87

Just found out that the engine is from a pre 2006 so throttle is cable.
That's one headache sorted

TimH

iTrader: (11)

And being a Spec C it ought to be a 2.0l not a 2.5? Unless - like my JDM - the previous owner built a 2.5 bottom end and fitted the 2.0l heads, rechambered to suit 2.5?

You say you have the full loom (vehicle and engine?) and ECU - then most of the work (headache!) will be transplanting the loom to the car.

FMJ

iTrader: (2)

Yeah the hard part is going to be when you find all the interior switch/gauge/heater/fpc/pump/dash etc plugs are incompatible and have to be repinned. But it can be done.

**jay**

iTrader: (1)

Syvecs ecu and the avcs loom from tim, easiest way too sort it

IainMilford

iTrader: (15)

As has been said Jamie, keep the existing loom you already have in your car and purchase an aftermarket ecu like alcatec or syvecs and the avcs loom from Tim/JTi.

Alternatively ditch the avcs and use some v5/v3 heads instead.

wms-racing

If you are fitting 2.5 heads the cam sensors work differnt to 2.0 avcs heads, make sure you speak with whoever is going to be mapping it and make sure it will all work ok. You could spend alot of time making it fit only to hit a problem with the ecu side of things.
Personally I would use a 2.5 with V3/4 heads, everything would be really simple and would go very well indeed :-)

TimH

iTrader: (11)

Think we need to know more about the engine! It could be a 2.5 with 2.0 AVCS heads, in which case 2 pin sensors. He has already said it is cable throttle so sounds more 2.0l-like than 2.5.

As has been said after-market ECU will be a whole heap easier than trying to use the "Spec C" ECU and vehicle loom. Unless you like knitting spaghetti

**jay**

iTrader: (1)

Come from andy forrests old spec c, pretty sure it was spec c heads with a forged 2.5 bottom end, best way would be to spend the money on a ecu that will run it and the loom from Tim

Jbrake87

I'm stumruggling to understand to why I can't run the ecu that was originally with the engine.
I have spoke to the guy selling it and he has said its all plug and play.
It's a pre 2006 so dbw is not a issue.
Forgive me for my lack of knowledge as I am very new to this.
All your inputs and advice is all really helpful and apriciated

TimH

iTrader: (11)

Because your V4 has a completely different vehicle loom, with different plugs for the ECU. It is totally incompatible with the engine.

Jbrake87

I have the loom for the new engine.
So the loom will connect to the engine and the ecu....
Apparently the loom will also connect to the lights,dash etc.
I don't want to be adding plugs/cables I don't need to.
Trouble in having is that half of the people I have spoke to have said yes my theory is right and half have said no, the dash/lights/ switches will be different

TimH

iTrader: (11)

There is an engine loom that terminates in multiway plugs in the engine bay. These connect to the vehicle loom, that includes the connectors for the ECU.

The V4 engine loom and V4 vehicle loom are different to a newage/Spec C in many many ways.

Only you know *exactly* what bits you have, and from what model years, so it is rather difficult from a distance: for all we know you have a modified/hybrid looms that will, indeed, work.

**jay**

iTrader: (1)

That loom will be from the spec c, it wont fit your loom, the engine either needs v3-v4 heads or syvecs/alcatek ecu and the avcs custom loom for it too work

Jbrake87

I'm not using my v4 loom on the engine.
I'm using the that was in the car with the engine.
I'm clearly missing the point here lol

TimH

iTrader: (11)

what wiring is in the car - V4?

**jay**

iTrader: (1)

Totally missing my point, you will be getting what is called the engine loom from the spec c wich then plugs into the main loom from the spec c, you are not fitting it too a spec c newage and fitting it too a v4 which has a totally different loom and ecu connection and also no wiring in the main loom for the avcs.
You would have to fit a main loom ie the part inside your car too newage which will be a nightmare as all the dash swichtes will need re plugged to fit a classic then plug the spec c loom into the new harness not too mention full dash and interior out to fit the newage main loom.
Or fit the engine the way it is get a syvecs or alcatek ecu fitted and the extra wires too the avcs and have it mapped.
Its defo not plug and play.

**jay**

iTrader: (1)

Even if it was going into a newage its a jdm and jdm and uk looms are different

Jbrake87

Ok. So I have spoken to tim@ Jt innovations.
Firstly, what a nice guy. Very knowledgable,and patient knowing the fact that I'm more to all of this.
All what has been said on this thread has confused me quite a lot, even to the point I have thought stuff it.. Give up and keep the car standard.
After a good chat with Tim I'm feeling a lot more confident. As you guys have said, he can use the plugs off of my old engine harness and refit them to the new age harness. Then a seperate loom for the Avcs. Simple as that.
Thanks for the advice and patience everyone.