Jump to content
SAU Community

Recommended Posts

Just wondering if someone could help me out, my V35 250GT Sedan is starting to consume about a litre of oil a week and blowing out large amounts of white smoke so it looks like time for a new engine.

I'm considering a VQ35DE from a 350GT Coupe as I can't find a 2.5 litre and not sure if it's a direct fit? Is there much work involved?

Thanks.

Link to comment
https://www.sau.com.au/forums/topic/411950-vq35-engine-into-250gt-possible/
Share on other sites

I just asked the same question but for a 300GT, apparently it's a straight swap, you just need a new ECU from the 3.5 model and that the gearbox is the same as the 300GT, not too sure about the 250GT though. I'm just gonna get the whole car instead, since I want a manual hahah

Edited by itsRICHARD

Yeah, you'll need not only the motor, but the loom, and relevant ecus. Don't know if the 35 ecu will talk to the 25 tranny ecu. Might just be a plug in, may be a wire in.

To me it sounds more like a head gasket issue, and may not be as expensive as you think. There are spare motors around.

I just asked the same question but for a 300GT, apparently it's a straight swap, you just need a new ECU from the 3.5 model and that the gearbox is the same as the 300GT, not too sure about the 250GT though. I'm just gonna get the whole car instead, since I want a manual hahah

I've had the valve seals changed and the mechanic who replaced them seems to "think" the head gasket is fine.... Can you recommend anyone selling a 25 engine?

I think nisswreck had a vq25dd stagea for wrecking, but it's been a while since I looked on their site. Also Scotty nm35 has a 25DD, but I'm not sure if its for sale. You can shoot him a pm.

The 250GT has a four speed box VS the 5 speed in the 3/3.5lt models. So you may need a new box and as said before all relevant looms and ecu. Most people are telling me this route for ease of forced induction

its difficult to upgrade the motor...

the ECU controls the motor and the dashboard

The TCM controls the trans

The trans needs to have the right instrument cluster for gear display

so in theory, the whole lot needs to be changed

its as easy as doing a V8 conversion

its difficult to upgrade the motor... the ECU controls the motor and the dashboard The TCM controls the trans The trans needs to have the right instrument cluster for gear display so in theory, the whole lot needs to be changed its as easy as doing a V8 conversion

What about the VQ25DET? Is this the same as the VQ25DD? Because I can see both on eBay

If so, what's the complications around installing this turbo engine into the car?

Cheers

Where I'm at at the moment is I can see a cheap VQ25DET on eBay with loom, withoute ECU and can see a VQ25DD ECU for sale separately, are they compatible?

What's the difference between the two engines?

Nope, not compatible.

VQ25DD - Non turbo, DIRECT injection motor

VQ25det- Turbo, std type injected motor.

You can pick up a VQ25det std ECU easy enough, but then you have to do all the intercooler and turbo plumbing as well, upgrade your gearbox and make the ECU talk to it too.

If you feel like being a trail blazer, go for it. But expect a lot of trouble shooting.

Damn, that sucks to hear..

So back to square one and look for a non turbo engine, is the 25DD engine comptabible with 25DE ECU?

My stock engine was a DE and theres a few cheaper options without loom/ecu etc for sale.

its always going to be a major job. electronics. if you like stripping your car down to a bare shell - meaning: taking the driveline, dash, loom all out and start from scratch.... do it.

you could probably get the 2.5 rebuilt and modded using turbo internals and bolt ons... keeping all the VIN numbers matching... for a bit more $

hell you would almost be better off dropping in an SR20DET blacktop and 6 speed...

Edited by Deep Dish V35

Damn, that sucks to hear..

So back to square one and look for a non turbo engine, is the 25DD engine comptabible with 25DE ECU?

My stock engine was a DE and theres a few cheaper options without loom/ecu etc for sale.

If you have a V35 250GT, the stock engine is a VQ25DD, not a DE.

its always going to be a major job. electronics. if you like stripping your car down to a bare shell - meaning: taking the driveline, dash, loom all out and start from scratch.... do it.

you could probably get the 2.5 rebuilt and modded using turbo internals and bolt ons... keeping all the VIN numbers matching... for a bit more $

hell you would almost be better off dropping in an SR20DET blacktop and 6 speed...

VQ25dd uses the same rods as the VQ25det so no issue there. Can't imagine that the studs/bearings etc would be different.

The DD is an interesting engine, I have some big power planned for the one I have here. I don't think a set of forged pistons will help it much though, I will be leaving the engine stock and running ethanol.

A lot of thought went into the direct injection and chamber design, the piston has a very interesting shape. Half the siamese port intake runners are cut on cruise also, to promote swirl. It will need plenty of custom work to get any power out of it, NA or FI.

The engine is similar to the VQ25det electrically, it even runs the same ecu plug (so the Fcon Vpro may work). The main difference is the fuel system, a high pressure fuel pump runs off one of the camshafts with ecu pressure feedback.

post-63525-0-19317000-1350906516_thumb.png

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • just an update to this, poor man pays twice  Tried sanding down the pulleys but it didnt do the trick. Chucked another second hand alternator in the na car which I got for free off my mate and its fixed the squelling. Must have been unlucky with the bearings.    As for my turbo car, I managed to pick up a cwc rb alternator conversion bracket + LS alternator for 250 off marketplace, looked to be in really good nick. Installed it , started the car and its not charging the battery.... ( Im not good with auto elec stuff so im not sure if this was all I needed to do but I verified such by using a multimeter on the battery when the engine was running and I was only getting 12.2v )   I had to modify the earth strap for the new LS alternator , factory earth strap was a 10mm bolt which did not fit the bolt on the LS alternator which was double the size so I cut it off , went to repco bought some ring terminals that fit, crimped it onto the old earth strap and bolted it up to the alternator , started the car and same issue. Ran like shit and was reading 12.2 at the battery.  For a "plug and play" advertised kit thats not very plug and play but alas.  My question is , am I missing something ? Ive been reading that some people recommend upgrading the stock 80 amp alternator fuse to a 140 amp but I dont see how that would stop the alternator charging especially at idle not under load.  Regardless ive pulled it out and am going to get it bench tested by an auto elec tomorrow but it would be handy to know if ive missed something silly or have done something wrong.   
    • My wild guess is that you have popped off an intake pipe....check all of the hoses between the turbo and the throttle for splits or loose clamps.
    • Awesome, thanks for sharing!
    • To provide more specific help, more information is needed. What Android screen? What is its wiring diagram? Does the car's wiring have power at any required BAT and ACC wires, and is the loom's earth good?
    • So, now all you need to do is connect the 2 or 3x 12v feeds into the unit to permanent 12v, ACC 12V and IGN 12V that you can find in the spot behind the stereo, and the earth, and then it will switch on with the car.
×
×
  • Create New...