There's really not that much custom work, if you actually knew what went into it.. Stock QR will make 300whp/280ft lbs at 8-9psi on a 50 trim/stage III T3/T04E. That's not too shabby.. especially since the TQ curve is flat as a rock from 3000 to redline. It really isn't a bad motor man... if you would actually look at it, and try messing with it.. you'd probably like it.

That kind of power won't come out of my shop.. we just don't build stuff like that.. we don't have the knowledge, or the means to. But, I DO know that someone big in the import drag scene is building a QR powered drag car, as we speak. And thier goals are close to 4 digit.

I wasn't trying to make this out as a SR versus QR thread... I love both engines. I was hoping that this build would be enough for some credit.. I guess not.

Travis

 

I guess you didn't see the engine options for the 2006 Frontier.. RWD QR25DE, using the same style tranny as in the 350z.. Yes, it will fit in the S13/S14 chassis..

Travis

 

Obviously you know a lot about QR's. I don't deny that the QR has more new stuff in it. It sounds like it's just set up wrong (for boost and big power) from the factory. Lets here you elaborate about this die cast block stuff. I can only assume that die casting will get you a denser hunk of metal. Last time I checked, hotwheels were die cast, too. heh.

Once you hit your number, sure we (or I, or some) will give you credit. Right now we're still waiting. In the mean time, it's going to take a lot more than a few $5k motors to convert the masses from the ole trusty SR. I was once told that Enjuku has sold over 1000 VSPL's for SR apps. That's 1 type of intercooler from 1 vendor in 1 region. I seriously doubt the QR will ever get close to that kind of acceptance. You are doing great things with the QR, but you can't expect everyone to be impressed.

The bottom line is the QR is no one's favorite motor. Altima owners want the VQ. Most Sentra owners couldn't pick their motor out of a line up. And, SE-R/Spec-V owners would rather have a smaller factory boosted motor.

 

I agree, from the factory, it's really not set up for big power. A light pressure turbocharger, set up correctly, yields a high 12-low 13 second daily driver, with a huge hunk of useable power. But, from the factory, that's about where it ends. Pistons/rods will allow 400whp. After that, the stock sleeves have to go.. So, 2500.00 worth of parts, will get you a block that can withstand 550whp or so.

The reason I was so interested in the motor... is the head and strength of the block. It just needs a lot of money right now, because no one mass produces anything for it. You're right, demand isn't there like it is for the SR. Time will tell if the QR ever does catch on.. It will never rival the popularity of the SR, simply because you have turbo variants from the factory that can make a ton of power. Now, if Nissan actually goes through with the engine that they are talking about putting in the Sport Concept, then that may change. Low comp, turbocharged QR25DET, with beefy rods, low comp pistons, oil squirters, etc.. They have been toying around with the test mules.. so, who knows..

The block is die cast.. using a high pressure injection process. The die goes from empty, to full in something ridiculous, like 1 second or something. The block is spun in a centrifuge after.. This means a more dense, harder block.. which is less likely to crack.

We will probably switch to a less laggy turbocharger, in the search for faster spool and wider powerband.. Maybe a SC61.. or 35R.. We smoked the clutch on it this week, trying to make a big pull. It hit 25-26psi, and the clutch let go. We were experimenting with a 250mm setup.. I guess we'll have to go heavier on the plate. I think it'll make 600whp at 26-27psi on C16. Hopefully, in a few weeks, we can get it to where we want.

Anyway, I respect you guys out there.. sorry if I got a little heated.. It's just frustrating sometimes, when you're trying to do something new, and you catch flack about it... lol.

Travis

 

no flack comming from here...SR's are going to die eventually (probably no time soon), and we've got to test different engines for the next big thing...and now with the new 4 cyl frontiers (rwd QR), i think we'll start seeing that swapped in to 240s. Nothing beats the SR because a factory turbocharged engine is so simple to make power on. Thats why the SRT-4's are so fricken popular. Good work Travis, keep it up, i hope to see you guys break 600hp for all the NaySayers.

 

Well, the good thing about the SR.. is that S13's were continued in production overseas until 98ish I think.. So, there's a LONG production run.. Even though they stopped making them a few years ago, there should be a long supply of used SR's in junkyards. I suspect we'll see a good supply for 10+ years, coming in from overseas. It all depends on how the SR craze goes from here.

Travis

 

what what what? RWD QR's??

What is QR stock engine management like? Can it be reflashed through OBDII, like a lot of current vehicles? The ROM tune is another benefit for the SR. Standalones are expensive, and I really don't think SAFC's controlling twice the HP is a very good idea.

I'm just impressed that we've gone 5 pages and kept it reasonably civil and under control. This is exactly what the tech forum is for.

 

The new stuff (04+), has a reflashable ROM in the computer.. I guess that would be considered EEPROM? The new QR ECU's are built on the same architecture as the 350Z ECU, which Technosquare, and a few other companies are reflashing currently. Technosquare claims to be able to do FWD QR (04+), but I haven't seen any dyno charts or anything yet. So, I'm sure it can be done relatively easy.. you don't even have to solder a socket in, like the old stuff. The EEPROM will accept changes directly.

Hey, most of us are adults here.. there's nothing wrong with a good debate every now and then.

Travis

 

I respect your stance on the QR, but i just don't think that it can offer anything the SR can't. In a previous post you have made, you've stated that SR's have headlifting problems due to faulty threading within the block from the factory. I have yet to see this in person , with several people running over 18psi-22 psi of boost on the stock headgasket/bolts, I just don't see how this is (not doubting your abilities as a tuner).Bottom line is , the SR will be able to achieve just about anything you could want out of a street car with the factory internals (bottom end to be more specific) still intact.Their are many other reasons why SR swaps are popular , and it's not just becuase they are JDM. I honestly do not think you will see many/if any people with S chassis cars swapping QR's in their vehicles.