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Turbo Charging A 2005 V35 250Gt Vq25Dd

Hunter_in_a_V35_250GT
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Hunter_in_a_V35_250GT Contributor

Hunter_in_a_V35_250GT

Posted
Posted

Really would like to turbo charge but i have a couple of questions which I haven’t been able to answer myself online.

1. Is it possible (I assume you can pretty much Turbo any V6 but again that’s why I’m asking)

2. Cost$$$

3. What other upgrades need to be done so that this turbo can be implemented efficiently.

4. Is it worth the time?

Again thanks and if anyone has experience doing this be it negative or positive I’d love to know.

scotty nm35 Grand Master

scotty nm35

Posted
Posted

The 2.5dd is a high compression motor, the only way to turbocharge it imo is to run it on e85, there is no way a 12:1 compression ratio will work with boost on petrol otherwise.

The other option is to swap in a VQ25det, which I am doing for another bloke in a few weeks. I am going to get it running on the stock ecu, with an Emanage Ultimate to help tune the timing and fuel. Keep in mind the det is a rare motor and will set you back 3k or so S/H.

Cost wise, if you need to ask, you should stop now. :P

Hunter_in_a_V35_250GT Contributor

Hunter_in_a_V35_250GT

Posted
  • Author
Posted

man thats a shame, what exactly is e85? i guess i should have done some more research when i baught the car ah well what can you do, you wouldnt happen to know if the Plenum spacer Kit for the VQ35DE will fit on the VQ25DD, i mean the engine looks the same shape.

Thanks Again

junkie Mentor

junkie

Posted
Posted (edited)

Too much effort IMO. Always better off with factory performance cars, everything is ready to go. Its not just about the engine, the auto box will need work if its to survive for a decent period of time, diff may not be strong enough, brakes will not be up to the task, then you will want to upgrade the suspension, replace the flat seats... etc

Basically, once you add up the cost of parts, labour, upgrades to other bits, and fixing stuff that breaks along the way (this will always happen) all of a sudden you have spent R33 GTR money

Edited by junkie
scotty nm35 Grand Master

scotty nm35

Posted
Posted

Agreed, but then you have an old GTR and no bank account anyway. :P

All those parts would have to be upgraded in any build, factory turbo or not.

e85 = 85% Ethanol and 15%petrol = Perfect fuel for turbocharged cars.

sonicii Veteran

sonicii

Posted
Posted (edited)

Anything is possible with enough $$$. But as Scotty said, this engine isn't going to make it easy for you. E85 is 85% ethanol fuel. Ethanol has a considerably higher octane rating than petrol, so it has a higher resistance to detonation, meaning you can run higher cylinder pressures before it self ignites.

Otherwise, the VQ25DD will need a tear down and rebuild for lower compression. A VQ25DET engine would be ideal, but as mentioned, they are not commonly available.

If you were after more performance, as 350GT would have been a better option, there are aftermarket supercharger/turbocharger kits available.

Edited by sonicii
Hunter_in_a_V35_250GT Contributor

Hunter_in_a_V35_250GT

Posted
  • Author
Posted (edited)

Ok, thanks for all the information, where would one get e85, i dont think ive seen it at regular petrol station, only ever seen 10% ethenol. anyway theres a lot to consider ( buying a different car) being one of em, but id be keen to hear of any other modes that can add something to the car, be it speed or control, shift kits seem like a great mod for an automatic car however i dont know to much about them and have only heard of the Trans Go range, which unfortunately don't make a kit for my gear box (RE4R01B) so if anyone has any experience with this gear box and gettitng a shift kit installed id love to hear about it.

Cheers

Edited by Hunter_in_a_V35_250GT
Howaitonaito Mentor

Howaitonaito

Posted
Posted

Ok, thanks for all the information, where would one get e85, i dont think ive seen it at regular petrol station, only ever seen 10% ethenol. anyway theres a lot to consider ( buying a different car) being one of em, but id be keen to hear of any other modes that can add something to the car, be it speed or control, shift kits seem like a great mod for an automatic car however i dont know to much about them and have only heard of the Trans Go range, which unfortunately don't make a kit for my gear box (RE4R01B) so if anyone has any experience with this gear box and gettitng a shift kit installed id love to hear about it.

Cheers

If you stumble across a nice search engine on the interwebz called google and type in RE4RO1B you will be amazed that it is actually a R34 GT-T auto box and that MV automatics in SA make one for this box. How do i know this? Ive done it. I am the person doing the VQ25DET swap in the 250GT.

Hunter_in_a_V35_250GT Contributor

Hunter_in_a_V35_250GT

Posted
  • Author
Posted (edited)

If you stumble across a nice search engine on the interwebz called google and type in RE4RO1B you will be amazed that it is actually a R34 GT-T auto box and that MV automatics in SA make one for this box. How do i know this? Ive done it. I am the person doing the VQ25DET swap in the 250GT.

What is this Google you speak of?

I wasn’t able to find shift kits for my gearbox in the limited time that I have for searching for this kind of thing hence why I post on forums so that I may hear from other peoples experience, as I believe this is a reliable way of getting the right information. In the past I’ve learned so much from Google to only be invalidated by real people’s experience. As far as MV automatics in SA, I am in NSW Sydney, kind of a long drive, but thank you for the information, which i will now use to perform said upgrades :D. Also how much is Scott charging you to put in the shift kit, really looking at getting this upgrade.

Thanks again,

Vince

Edited by Hunter_in_a_V35_250GT
Howaitonaito Mentor

Howaitonaito

Posted
Posted (edited)

*facepalm*

I had my shift kit put in last year by a friend and former NM35 stagea owner. Scotty is doing my VQ25DET motor swap.

Ring MV automatics. What will happen is: you pay i think it was $550 in total. $100 of it is like a deposit. They send you the upgraded valve body ok. You put the upgraded one in and take the factory one out. Send them your OLD factory valve body and the give you the $100 back.

Ring around some automatic transmission specialists in sydney and get a quote on how much to have it installed.

I will tell you this right now: changes are quicker but not smoother and tend to be clunky/rough on occasion

Edited by Howaitonaito
Hunter_in_a_V35_250GT Contributor

Hunter_in_a_V35_250GT

Posted
  • Author
Posted

"changes are quicker but not smoother and tend to be clunky/rough on occasion"

Does this effect the ride comfort/jerk the car on gear changes?

Cheers

scotty nm35 Grand Master

scotty nm35

Posted
Posted

It's not a commodore. :P

Of course it won't be as smooth as oem, that's why the clutches slip between gears to make it all seamless and gentle. It shouldn't be harsh at all, but I have yet to feel the MV kit.

Hunter_in_a_V35_250GT Contributor

Hunter_in_a_V35_250GT

Posted
  • Author
Posted

sorry, never driven a commodore, dont expect ultimate smoothness, but it as long as it doesnt jerk or anything, i dont realyl care, how is driving tip tronic affected by the shift kits any noticible difference from full auto?

Howaitonaito Mentor

Howaitonaito

Posted
Posted

"changes are quicker but not smoother and tend to be clunky/rough on occasion"

Does this effect the ride comfort/jerk the car on gear changes?

Cheers

Its still pretty smooth 90% of the time. You do feel it change but every now and then in bumper to bumper or low speeds it gets a bit jerky.

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