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  #11  
Old 01-14-2011, 10:51 AM
Matt93SE Matt93SE is offline
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Any chance you can make a QR RWD without too much effort? If so, what's a reasonable power potential for it?
In my SCCA class, I've got to stay below 3L, and weight is based on displacement.
running the KA, I'm at 2640lbs. (1.1lb/cc). If I go to a VQ30, I'm at 3300lbs.
I'm trying to get the SR20DET legalized, but I don't see that happening anytime soon.
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  #12  
Old 01-14-2011, 04:04 PM
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same salvage yard is has 6 up for sale for $500 a pop.... of course we want the one with 26,000 miles on it.

We're hoping they left most of the sensors on it.
That's rediculous, considering I've sold VQ30's for 300-400 with harnesses LOL!
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  #13  
Old 01-14-2011, 07:03 PM
Big J Big J is offline
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Quote:
Originally Posted by Matt93SE View Post
Any chance you can make a QR RWD without too much effort? If so, what's a reasonable power potential for it?
In my SCCA class, I've got to stay below 3L, and weight is based on displacement.
running the KA, I'm at 2640lbs. (1.1lb/cc). If I go to a VQ30, I'm at 3300lbs.
I'm trying to get the SR20DET legalized, but I don't see that happening anytime soon.
Clark at JWT did one or was working on one for a 510 iirc. The starter mounting hole isn't there, but the room is there to machine one in.

The 2005+ frontier ran a RWD QR25 and a 5 speed manual.

I'm working on a motor for a friend....... SR20 crankshaft in a QR25 block for a 2.2L displacement that will rev 9,000 no problem...... think tall block, long rod, big bore, SR20.... with a way better cylinder head and valvetrain.......
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Old 01-14-2011, 09:42 PM
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I thought QRs had a valvetrain that did not lend itself to revving high. Lifters maybe?

Plus the block is pretty weak right?

Any dynos of high revving destroked QRs?
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  #15  
Old 01-14-2011, 11:13 PM
Big J Big J is offline
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the QR is here to stay.

The block is fine. It's a split block design, like the HR. The cylinders are fine, the piston ring lands tend to be fragile if you run into detonation.

The valvetrain is the same as the VQ, cam on bucket. The newer QRs use the VQ buckets which are 9gms lighter. You can retrofit the newer buckets into the older QRs.

The headbolts are the same as the VK56.

My DD has a turbocharged QR. Been boosted for 55,000 miles, 90k total on the original bone stock motor. On 9psi with a 50 trim turbo the car puts down 315whp and 298wtq. I'll run 12psi every now and then, and it's dyno'd 360ish on race gas.

It's the 100mm stroke and short rod that keep the motors from revving.

No dynos of an NA destroked QR. The one I'm building is turbo. But, there is a 2.0L version overseas. The 2.0L pistons will drop into a 2.5 and bump the compression to 12.4:1. With an SR20 crank, the QR20 pistons would be right around 11:1. With some porting and aggressive cams, it would be a really good NA motor combination. It would easily outdo an SR20VE, and probably be good competition for a Honda H22 or K series with enough prep work.
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  #16  
Old 01-15-2011, 09:39 AM
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What makes you say it would easily outdo a SR20VE? What's the advantage of the QR?
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  #17  
Old 01-15-2011, 12:19 PM
Big J Big J is offline
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displacement, head flow, lighter motor, 6 speed LSD trans bolts right up, dime a dozen. Keep in mind I'm talking about a destroked 2.2L QR, not the 2.5L.

K1 Technologies is making the connecting rods for me. Should be done by the end of the month.

With a factory QR20 piston the comp ratio would be right around 11:1. JWT will can/will cut a grind that will work well with the combination.

We might end up doing an NA version of this motor in the future.
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Old 01-15-2011, 06:37 PM
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There is no doubt about the QR stuff, Clark really likes them. Shame they get such a bad wrap in stock form, as it's all easily fixed stuff that typically goes wrong with them.

THe transmission options alone make it worthwhile. THrowing 3000 dollars with of gear into a crappy box still sucks. And even then most SR cases are crap as it is.
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  #19  
Old 01-16-2011, 12:20 AM
Big J Big J is offline
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Clark used to hate the QR, lol.
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  #20  
Old 01-18-2011, 07:42 PM
Big J Big J is offline
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motor showed up today.

Z1 Motorsports has an 05 350Z harness and ECU w/ my name on it.

Car is still out getting caged.

Next pay check check will get a trans, VQ bellhousing, and I'll go ahead and build the mounts and get the motor in the car.
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