Is the QR20DET a direct replacement? [Archive] - B15sentra.net - Nissan Sentra Forum

: Is the QR20DET a direct replacement?


Beau
03-13-2003, 03:30 PM
I was just wondering if this would potentially be a better replacement than using an SR20 since they both use coil-on-plug ignitions and the QR head is supposed to flow better than the SR. There must be some QR20's reaching 30k miles in Japan by now, might be a cheaper alternative to getting a turbo ready motor in these cars.

I did a quick search, but I didn't see anything about how direct this swap would be.

JoJoCal19
03-13-2003, 03:32 PM
Very Very interesting. Travis or Chickracer, do you know anything about these engines? That would be a good thing if they shared the same engine mounts and the ecu/wire harness were close. That would be an ideal swap.

CrazeD_SpecV
03-13-2003, 03:50 PM
stats on qr20det?
what car is it originally from?

mrmixitup
03-13-2003, 03:52 PM
Do you mean an SR20 with a QR25 head?

If so, it can't be done.

Never heard of a QR20DET engine. The QR series is reserved for Nissan N/A engines.

Beau
03-13-2003, 03:56 PM
I heard in some thread about the QR20DE in some other thread, but it's only available in Japan, maybe some other markets. So, it does exist, but whether it's available in DET form or not, I don't know. There is limited information available if you do a search on the subject.

Beau
03-13-2003, 03:58 PM
Originally posted by mrmixitup
Never heard of a QR20DET engine. The QR series is reserved for Nissan N/A engines.

Just noticed this last part. Is that fact?

tgenius
03-13-2003, 04:02 PM
Isn't the QR20DET the one used for the X-Trail SUV?

cwepruk
03-13-2003, 04:04 PM
I thought it was a QR20VET?

At any rate, it's a facoty turbo engine based on the QR.

BodeB15
03-13-2003, 04:08 PM
Nissan Primera = QR20DE motor

JohnO
03-13-2003, 04:10 PM
that is an SR20VET in the x-trail.... there are no QR factory turbos...

The QR20DE has been discussed here several times. The stroke to rod ratio make it a nice option. The crank, rods and pistons would be a straigh swap for our cars allowing them to rev up to the 8k range. There really is no other info on the crank strenght or rod, and piston strenght.

Raverjames21
03-13-2003, 04:21 PM
It would probably be pricey to get one seeing how it isnt widely imported into the country. If you want on of the best 4 banger replacements and you got some green to burn, go for a SR20VE, SR16VE N1, or a SR20VET. All have new NEO VVL systems and tons of power per liter.

BodeB15
03-13-2003, 04:42 PM
Wooo Woooo , power !!!!!!!! LOL

Raverjames21
03-13-2003, 04:44 PM
I hear that is the best kind. Just fo dekaration.

cwepruk
03-13-2003, 04:48 PM
Dats only in the mornin.

Should be up cookin breakfas of somthin.

BodeB15
03-13-2003, 05:23 PM
Ebonics ? LOL

CrazeD_SpecV
03-13-2003, 05:39 PM
Originally posted by JohnO
that is an SR20VET in the x-trail.... there are no QR factory turbos...

The QR20DE has been discussed here several times. The stroke to rod ratio make it a nice option. The crank, rods and pistons would be a straigh swap for our cars allowing them to rev up to the 8k range. There really is no other info on the crank strenght or rod, and piston strenght.

What would our displacement be with those parts?

N/ASpecV
03-13-2003, 05:45 PM
2.0

Vegas
03-13-2003, 07:08 PM
Here's my thread hijacking attempt...

QR25DD?

From a Stagea or New Skyline? Just throwing out a thought???

BodeB15
03-13-2003, 07:10 PM
Double-D's , kind of like that , easy to remember . I just think of titties , and it comes to mind . lol

JohnO
03-13-2003, 07:47 PM
Originally posted by Vegas
Here's my thread hijacking attempt...

QR25DD?

From a Stagea or New Skyline? Just throwing out a thought???


Same exact engine ... just has a direct injection fuel delivery system ...

people here is how to read a Nissan engine code...

http://www.freshalloy.com/site/features/tech/engines/home_codes.shtml

All qr are family engines .. they use the same exact block ... just have a diffrent stroke..

chickracer
03-13-2003, 07:52 PM
QR20 engines are found in the Primera, Wingroad, Serena, Liberty, and X-Trail. The QR20 and QR25 are very similar engines. Both have the same 89 mm bore and 97 mm bore pitch. Same combustion chamber shape, same valve sizes. 80.3 mm stroke on the QR20 and the 100 mm stroke on the QR25. The QR20 crank drops right in the QR25 to produce a 2.0L engine capable of revving to 8500 rpm. An undersquare engine (bore smaller than the stroke) like the QR25 doesn't rev as well as an oversquare engine (stroke smaller than bore) like the QR20. It is an open deck block as well with two piece design split in the center of the crankshaft, 5 main bearing caps in the lower block. Oil pan is also 2 piece with upper cast aluminum pan and the lower piece is stamped steel. The blocks are pretty much the same, high pressure die casted with lightweight, thin walled construction. It still has lightweight valve springs and thinner connecting rods. It also has CVTC, the intake cams continuously overlap between 3 to 33 degrees. Basically, the internals are fairly close but the QR20 has a 9.9:1 compression ratio vs the QR25's 9.5:1. There is also a QR25DD found in the Primera that has a 10.5:1 CR. There is a 2.2L turbo deisel engine in the X-Trail also. There is also the perfectly square 86 bore, 86 stroke SR20VET with 9.0:1 CR in the GT version.

chimmike
03-13-2003, 07:55 PM
so on the same thinking of the QR20DD internals being used in the QR25...................... What about the QG15DD internals? Any info on that engine? LOL I know people aren't really into looking at these engines, but I thought I'd ask.

chickracer
03-13-2003, 08:04 PM
The QG15 has a 73.6 mm bore and 88 mm stroke and a 9.9:1 CR. The QG18 has a 80 mm bore and 88 mm stroke, but only 9.5:1 CR.

chimmike
03-13-2003, 08:07 PM
ok, so I guess my idea is out? lol

chickracer
03-13-2003, 08:11 PM
You could do it, same block. But the 1.5 is the base engine, the 1.8 is the upgrade.

Raverjames21
03-13-2003, 08:22 PM
I still stand by the fact that SR20VET is the way to go if you have money. I cant turn that 280hp away

Beau
03-13-2003, 09:04 PM
Wow. This was way more than helpful and informative. I think I know everything I need if I ever have the funds to build a mean turbo engine.

Vegas
03-13-2003, 09:42 PM
I just relized i said QR25DD, i really meant...

VQ25DD...

It's a 6cyl and i think it might be rwd only... Just curious, prolly wouldn't work though.

1ofakind_SE-R
03-13-2003, 09:56 PM
So my dreams are, creating a QR25DET+R...according to that website at freshalloy.com.

chimmike
03-13-2003, 09:57 PM
what's the R?

cburwell
03-13-2003, 10:06 PM
Originally posted by chimmike
what's the R?

The "+R" would be for a bigger turbo, or oversized turbo as the FA pages puts it. Just a plain old "R" would indicate a supercharger.

Criosdaidhlaoch
04-16-2003, 11:32 PM
Is the X-Trail (or whatever with the destroked qr25de) a Nissan vehicle sold in the US?

DILYSI
04-16-2003, 11:42 PM
Okay, I've been on this kick lately to build this QR Frankenstien. I'm moving to AZ in a month, and then I'll try to get started Post F Haste. Chick Racer? I only have one question. Where do we get the crank? Can Courtesy Nissan get it?

This SO needs to be done. I WANT a TURBO! what would the final displacement be, and what would be the compression ratio?

david_r
04-16-2003, 11:51 PM
Originally posted by CrazeD_SpecV
So tired of you morons and your imaginary turbos
you assholes are never gonna have a ****ing turbo.. deal with it..
If you want a turbo that bad just go trade you car for something with a turbo and be done with it.

damn man.. that was harsh but soo true

pio!pio!
04-16-2003, 11:54 PM
mm QR25DD..direct injection..low sulpher high octane gas mmm..

an SR20VET sounds very nice too! drool..

the x-trail is not sold in the US. I am told it's like a mini x-terra

01sentra1.8
04-17-2003, 12:00 AM
Originally posted by CrazeD_SpecV
So tired of you morons and your imaginary turbos
you assholes are never gonna have a ****ing turbo.. deal with it..
If you want a turbo that bad just go trade you car for something with a turbo and be done with it.
HAHAHA, so true....

baby GT-R
04-17-2003, 12:12 AM
If someone were to change the crankshaft frmo the qr20 into the qr25, would the aftermarket pistons that JWT is working on still fit?

chickracer
04-17-2003, 02:35 AM
If you really want to get a QR20 crank, PM me. I know how to get one for about $650 although you could probably import the entire used motor cheaper if you can get ahold of one on the engine importer lists. A QR20 crank on the motor will produce a power curve similar to the SR20-peak torque about 1000 rpm later. The head will flow better and the rods could be longer but it wonít be as good as that extra 500cc of displacement. But if you want to race a class with displacement limits or weight vs. displacement, the QR20 would be the way to go. The QR20 rods arenít any thicker, just longer. You can go to a higher rpm with the shorter stroke but youíd lose some of that low end torque. Itís definitely the way to go for N/A crazy engine buildup. One good thing of the QR20 is the compression ratio- the rods are longer to make up for the shorter stroke (same deck height and piston pin height) and the piston has a dome vs the QR25's dish to make the 9.9:1 compression ratio with the same head volume as the QR25's. It may be better in a race class with unlimited cams. But I think the QR25, if properly built, is the way to go. The cylinders will be good for almost 20 psi before needing sleeves. The QR25 crank is good until 12-14 psi but above that level, although you might want to put the QR20 or an aftermarket SR20 shorter stroke crank. The connecting rods have worked past 11 psi as of now to my knowledge. The pistons should be good to the same also as long as you listen for pinging and donít tolerate any! You can't boost as high as an SR20 with stock internals but it's still a good small to medium sized turbo with awesome torque. Itís an expensive thing to take under and probably not worth it. I talked about the advantages and the difficulty in modifications to fit that crank in the QR25 block in my December NPM issue- www.nissanperformancemag.com/december02/ask_sarah/

Sicx13
04-17-2003, 03:00 AM
Originally posted by chimmike
what's the R?
its for rice

GREEN01GXE
04-17-2003, 03:18 AM
Originally posted by Raverjames21
............and you got some green to burn...........
I wish
:D

chickracer
04-18-2003, 02:50 AM
Guys please don't turn this into a dumb flaming thread. There is good info in here and I'm too lazy to delete it just to have to answer this question in another week b/c someone can't search for it. It's true that most of the people on here who say they'll get a turbo probably never will but yes, there are turbo spec v's out there already- I just rode in JWT's the other week. Everyone can dream and some will live the reality.

Sicx13
04-18-2003, 02:52 AM
good call, Chickracer

Raverjames21
04-18-2003, 02:47 PM
I will post pics of my turbo setup in 1.5 month's, but I have an SR20 so it is not as impressive.

SpIcEz
04-18-2003, 08:00 PM
BTW, just a small question.

For those of you thinking / dreaming about DD engines.

Wouldnt it be a pain in the ass running this here since we have such low octane and bad crappy fuel ?

pio!pio!
04-18-2003, 09:28 PM
yes our gas would not work very well w/ direct injection

Ross
04-21-2003, 06:13 PM
for all you guys at the beginning of the thread wondering about which engine is in which vehicle.... go here.

http://www.freshalloy.com/site/features/tech/engines/home.shtml

and sorry... i didn't read the entire thread, so if someone already mentioned this or something similar to it, sorry.