[Ben]

The SR20DE successor that is supposedly going to power the '02 SE-R. In the US it'll be a QR25DE, but the specs should be very close.

Displacement: 2488cc
Compression ratio: 10.5:1
Bore x Stroke: 89mm x 100mm
Max Power: 178hp @ 6000rpm
Max Torque: 192ft-lbs @ 4500rpm

dyno chart of the new motor:

Looks to be VERY promising. The torque curve isn't terribly flat, but SR20DE like since has a small bulge at 4200rpm or so. Jay Hassinger mentioned

"I'm really trying to stay positive about this motor but this is a stroker
motor. ACK!

The KA is a stroker motor and while I like it, strokers get unsettled at
high RPM and don't usually make high RPM hp. By comparison the SR20 is
square. (Bore and stroke the same) that's why it's got a ton of mid-range
and still like to rev. The Honda (And new Toyota 1.8) motors are very
undersquare. That's why they like high rpm, high gas flow velocity and make
little torque.

I really hope Nissan works some magic into this engine so it's not another
"KA" type motor. The SE-R needs a screamer, leave the strokers for the
Frontier;."

 

[Guest]

10.5:1....kinda rules out a high boost turbo (unless properly built).

Ben, about what you said of the stroker running out of air at high RPM's. You are absolutely correct. I own a 2000 2.5RS Impreza which as you may already know carries a "stroked" version of the EJ20T (turbo) in Japan and the UK. From personal experience I can tell you that my car does
run a little weak above 5500.

Now, in the EJ25, Impreza tuners have found the factory cams to be a big contributer to this. Tuners such as Trey Cobb (www.cobbtuning.com) have gained good upper RPM power through just mild grind cams. And from being friends with Brian I know the SR20's love cams.

From the looks of it though, the new QR25DE
is pretty potent. 192 ft-lbs. of torque!!!! And I thought we had a lot of torque (165)!

Does this car have a good future with the aftermarket though? To high compression for a turbo? To high for a supercharger? Maybe NOS? Looks like there are very few N/A mods that can be done for great power (maybe full exhaust and cams) because it appears that Nissan squeezed a lot out of the stock configuration.

Maybe I am wrong?

 

[Mel E Bog]

The 10.5:1 CR is for the QR25DD. I think the DE has a lower CR. I think it was just discussed on the list too. So the CR will probably be something like 9.X:1. I'm hoping that this engine will be able to be tuned and hopefully Nissan will have a DET/DDT out in Japan for this engine as well, kinda doubt it though.

Mel

 

[Guest]

The DE does have a lower CR.

I was just going off of what Ben quoted in the initial post.

 

[Mel E Bog]

My bad... hehe... =)

 

[brian]

but the funny thing is that a type rice, I meant r has a 10.5 cr and only makes what 4 ft/lb of torque?

 

[Guest]

I personally think this is pretty weak considering the size of the motor. The SR20 is making 70hp per liter and the QR25 at 10.5 : 1 is making 72hp per liter. It does make more torque though.

Honda gets 100hp per liter in a car that costs less than $20k, pretty impressive. I guess it comes down to what you like more, a high hp lower torque car will win on the track.

I guess the benefit to the QR is that there should be lotsa room for improvement

Ryan

 

[Sr20 B12]

Guys, where are we getting our "new" SE-R info from? I heard that the new se-r will have a Qr20DE or Qr20DD engine that will produce over 190hp's! The QR25DE as far as I heard will power the 2002 Altima.

I have see several pictures of the Qr20DD online and I can say that it is a well planed out motor ( I would post the picture here but I don't know how. E-mail me if you want to see). It's going to go heads up agains the 2002 Integra Type R (over 200 hp's)!

 

[Mel E Bog]

Actually I think there is still alot of speculation as to which version of the QR motor will make it into the SE-R. I've heard it'll be the QR25 but theres also stories that it'll be a tuned QR20. I guess I don't really care, as long as it puts out alot of power, torque and has room to tune it much like the SR20 could be tuned.

Mel

 

[Guest]

Hopefully it will be the QR20DE. I know I would rather have the EJ20T if I were to go turbo in my car! Otherwise I am pretty happy with the EJ25.

 

[Zak91SER]

The QR25DE will be in the new SE-R. 180-ish HP, over 200 lb-ft of torque. Don't ask me where I got the info, just trust me when I tell you it's accurate.

 

[Guest]

We'll trust Zak on the SE-R side... as for the 2002 Altima, everything I've seen so far indicates that the Altima will be a twin of the new Primera coming out this winter in Japan (which makes sense, since the G20 is slated to be cut from the Infinity lineupe in the near future, and the Altima's current sister-car, the Bluebird, is based on a Primera platform)
Kinda cool, actually, having the Altima and Sentra SE-R come together in the QR family... I assume the Sentra will also get a QR makeover in the next year or two...