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| The wastegate discharge pipe, downpipe and flange before welding. Stainless is very hard to miter because it’s tough and gummy. Mike spent several hours mitering the wastegate tube as it is a very complex 5 axis fit. |
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| A very nice fit before welding! |
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| First the hole for the wastegate tube must be made in the downpipe. A drill is used for the corners. |
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| Then a cut off wheel to cut between the corners. |
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| The rough cut hole, now we are ready to weld. |
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| The parts are welded together. The Argon flow is turned up high from the opposite side of the welded pipe to chase oxygen out the open end. |
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| Our welded downpipe! |
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| The hole in the downpipe is ported smooth to the final shape. |
6 comments
Mike, how is the time attack coming? For years I’ve been toying with the idea of a primarily off the shelf parts V12 with enough capability to be worthy of the investment. Sure anything V12 would be cool but for genuine interest, I need two things. For larger displacement, (the impossible find! Every OE is making baby bores for economy) that 87mm is the absolute “sweet spot” for single sparkolator flame front propagation, meaning lowest possible chance of detonation while still having room for valves. For displacement and having a minimal chance of detonation, I need a dual plug 4.5 inch bore. I’ll have to compromise with a single plug at 4.150-4.185 bore. Nissan has a 4.41 bore space, Mopar has a 4.46 bore space. The Mopar 3.5 SXT and 4.0 R/T Nitro have SOHC 60 degree blocks. Beefier than the Nissan with closed deck design. VQ37HR or VK56 heads oughta do.
The point is, I found your T/A build here searching for QR25 bore spacing, wuuuh waaah, too small. This is an awesome build! Can’t wait to see it go. I’m thinking of a LS mid sleeved VK56 for a 94 Sentra rwd conversion!! Lotta work, but cool factor off the charts. Wheel well and opening hackery for to the Nth degree to get any decent size diameter tires.
When is this thing gonna make some runs?
We scrapped the car mostly because the QR engine is a piece of trash and there was no interest in the car besides maybe 50 people in the world which made sponsorship impossible. Basically what you are planning isn’t really possible and your assumptions of bore size and understanding of bore spacing are not correct either. Your considered build won’t have any sponsorship or fan interest either. It is also several hundred thousand dollars to do what you think you want to do. I suggest sticking to cars that have more interest and technology that is off the shelf.
that’s what make it more interesting. making/fabricating your own parts. it’s challenging. off the shelf parts is kinda boring.
Well I’m interested in what you have to say about my following comment…
I’ve already poured a couple thousand dollars into my qr25 build with over two years of research and it might very well be a waste of money but it’s one I’ll see through. I just got my stage4 clutch from 2j-racing, they have been a big help to fill in some of the gaps. I to am aiming for 400hp-450 safely but for street, still taking the massive extra steps to make my bearings happy and oiled. my last piece of the puzzle “was” going to be sleeve the block but I see you used a different method, one that I only heard of a couple weeks ago. Now, I read you didn’t finish the project but how do you think the engine would have held up with the aluminum filled epoxy resin?
Hows your build coming Emily D?
I’m in the middle of my turbo build, shooting for 280hp on my 02′ with 34k miles and still running strong. Concerning your block try reaching out to VisionRacing, or better yet you can do a VQ swap with Nissformance kits.
Emily I actually finished my build..
but I had spent LOTS of money addressing the well-known issues of the engine.. plus all other things around the engine..
all I have to say is if you want to make power, there are cheaper ways, I was WAY to invested in the car, to just scrap it, so I saw the project thru and we had some failures and some wins!
since the car body isn’t in that good of a shape I am going to delete the rear bumper and put a crash bar like a drift cat (yes is silly, but I have the rear end look, I am also going to put a racing and ok, not to horrible of a wing on the car and black out the light lens..
you can kinda see the progress of the car on my Instagram
anuar.m.yanez that’s my handle.