Qr25de

so i am still entertaining this swap as well. seeing as the qr is lighter that all the other 4cly engines that our common swaps (ka,sr,ca)

so it seems that the qr is once again a viable option!

you say its fwd. well the frontier is rwd and some of the bits like the intake can be swapped over. The rwd version has less hp but more Tq, but im assuming as with the spec-v version just adding intake exhaust and agressive cams will net a good 75hp gain. the qr handels boost just fine if tuned right. there is a girl here who moved from new jersey, she might actually have the second fastest qr in the states, and shes still getting 28 mpg with spirited driving. '02 SE-R Spec V: Built, Standalone, and Boosted @ 25ps thats her basic info, cant post more yet till i get the goahead.

anyways on to the exciting news:
the z32 trans bolts up to the qr25de, which means the ka trans will/should bolt up as well!!!!

major concern is drive by wire, but we can get around that

haha no takers huh?

Seriously fuck drive by wire.

yeah i hear its pretty horrible. but there is a way around it. Iirc the frontier doesnt use that system. im waiting for conformation on a lot of info though.

transmission stats that someone posted for me:

3rd gen 200sx's
Z20s transmission 1981 ONLY
1st: 3.321, 2nd: 2.077, 3rd: 1.308, 4th: 1, 5th: 0.864
Z22s transmission 1981-83 Transmission number FS5W71B
1st: 3.592, 2nd: 2.246, 3rd: 1.415, 4th: 1, 5th: 0.813

Nissan Frontier 1997 Transmission number FS5W71C
1st: 3.321, 2nd: 1.902, 3rd: 1.308, 4th: 1, 5th: 0.838

Sorry i dont have the Engine ID for the first one... these are all just scribble notes i have in my note book 240 file cabnet thing. Just for all those times when i need to remember what kind of spark plugs to look up for an SR... things like that.

So i think any of those ID codes should fit actually.

So a C trans from an S12 would fit then. Possibly bellhousing swap but that's easy.

Maxpow
Seriously fuck drive by wire.

interesting if your right maxpower this could end up being better than a KA. Im looking into how to make the first gen's as reliable as the second gen's. As i have a feeling the second gen's could be a bit pricey. Some of the stuff swaps over and there are some good aftermarket pistons for the qr. ill have a lot of links to performance goods and a good ecu/standalone tuner as ther are no mainstream maps for the qr yet.

MegaSquirt?

I like the block design of the QR, but things like balance shafts and half count weight cranks leave a bad taste in my mouth.

Yeah come up with a ecu and maf combo that will work for it, tune the shit out of it... probably need custom intake because it will almost certainly be trying to suck air from a weird part when you turn it sideways...

seems like a lot of work bro for something 100cc's bigger than a ka24...

There's a ka24 DE in the yard right next to my house.

lighter, more power(200hp out the box), smaller, better gas mileage

is the ka for sale? and is it single or dual cam?

In the junkyard i should have said. Its for sale for sure, on half off day its like 150 I believe for the full motor. Just needs a valve cover and probably a tear down to check it.

Do you know if it's a dual or single cam? How much would you charge me total to rebuild and install?

Maxpow
There's a ka24 DE in the yard right next to my house.

wtf is drive by wire???

fyneyoungstunna
Do you know if it's a dual or single cam? How much would you charge me total to rebuild and install?

sideways_s12
wtf is drive by wire???

Yeah I really despise drive by wire but unfortunately it is now pretty common in a lot of the newer cars.

Hahaha I totally saw that before I posted that too, my bad. I'll take you u on that offer for the swap maxpower. Let me get some cash together.

I don't like the qr25. It's too weak. I don't think it's worth it to build it up to handle more power. Dollar for dollar the ca18 or sr20 is a better route. Especially if your only looking to make <300hp. I'm on my second qr25 in 126k. The current engine is on its second head gasket. The drive by wire in my spec-v isn't that bad. There's this new product out to eliminate the delay in the drive by wire system. It's called the sprint booster. It plugs in to the accelerator pedals wire harness. I don't know how good it is.

z32 trans and ka trans arent the same bolt patterns

The ka trans is a replacement for our z32 trans, according to 300zxclub.com. and a few other websites its a bolt up affair

the qr is more potent stock that the sr is, and lighter with more tq.
i hear of issues but every engine has its issues. the person i was talking about whips up on built sr's all day shes pushing 24psi boost.
there realy is not talking me out of liking this engine. im set on it.

David B
z32 trans and ka trans arent the same bolt patterns

fyneyoungstunna
The ka trans is a replacement for our z32 trans, according to 300zxclub.com. and a few other websites its a bolt up affair

google search it!

"no it totally works. google told me"

haha dork.

it wasnt google, as i said, on 300zx club.com this has been discussed and tried. this is fact.

haha dork.

it wasnt google, as i said, on 300zx club.com this has been discussed and tried. this is fact.

oh and the started is NOT bolted to the trans

fyneyoungstunna

oh and the started is NOT bolted to the trans

You do realize I own a z right?
And my bad on the bolted thing took that the wrong way

hmm so it seems like most of the problems on the qr are caused by not loctiteing the screws on something or another.

oil consomption is the same as above.

with mild boost and a stand alone 300hp is common.
i kinda like the idea of an sr 6 speed, but for ease of swap i guess a "c" trans will work.

Is this another fantasy thread?

yes.

Dont come in my thread acting like a bamma, jack! Spilling your hater-aid all over my floor. you can eat my ass with a spoon!

 Anyways ive been collecing more and more data on this swap, in detail,over the past few months.
I might be the first documented swap if the datsun 1200 roadster guy doesnt beat me to it. I might have a line on a full motor, but the competiton for it is stiff. If all else fails ill just pull a longblock from the jyard and go from there.

Well, I'm pretty well sold on the qr25de or qr20de.  This could work out great.  The Frontier came with a rwd 5speed, I'm looking into that but haven't been able to source one for measurements.  It's a very lightweight solution with coil-on-plug ignition.  They're all low-mileage and so lightweight it's ridiculous.  Let's figure out what transmission options will work and make it happen.  I have a ka24de transmission sitting in my garage that I could test fit if I can find an engine.

<3 the QR25 - I'm shocked constantly how torquey, balsey and generally how useable this engine is.  By all accounts it responds to <12lbs of boost predictably and is fairly straightforward to tune.  Mileage sucks IMO, but the butterfly screws and general oil consumption problems you'll read about are mostly a non issue for me.  It's an extremely easy engine to work on....

Having said that, I'm swapping the QR25 out for a VQ35 as soon as practical instead of boosting what I've got.  :)

The QR25 is significantly lighter, but the VQ35 is one of the best engines Nissan ever made.  I'm far more concerned about weight.  With minor work, the qr25de should be able to hit 200whp n/a pretty easily, and that's where my power needs end.  I want to keep the car under 2000lbs, and the engine and trans are a huge part of that.

Both ka24e(de) and the vg30de from the z32 (not the turbo one) use the fs5w71c... the bellhousing is different along with the shifter assembly, but the transmission is the same... along with the rb20det, the vg30e in the S12, the mkII ca20e, s13 sr20det, etc... all the bellhousing swaps from one to the other, but the tailshaft assembly (where the shifter is bolted) is different from one tranny to the other depending on the platform it was used on and the gear ratio are also quite different.... so basicly, if you swap a qr25 bellhousing out of a frontier (if it uses the fs5w71c as stated above) with a s12 mkII tranny, you will have a bolt on tranny with the qr25 block and the stock driveshaft yoke and tranny cross member... as for the qr25, i quess we're talking about custom mount...

Didnt think anyone was paying attention to this thread!!

@drummingpariah: 200hp is actually right around the corner. a better flowing exhaust is all you need well and intake to go with it.

as far as practicality goes, the qr still beats basically the whole lot of nissan engines outside of the fjet. 32mpg on 12lbs of boost is...welll....tits!!

Im still trying to find a test mule for the trans issue, but i think a bellhousing swap with an sr, or an ca18 will net supprising results.....

Jphillips: what year and how much mileage is on your qr ? what vehicle is it in?
I might buy it if the timing and money is right. i really want to make this happen. E85 is very prevalent out here and will do wonders for the qr.

I've done quite a bit more research, and decided that an sr20de makes significantly more sense.  It mostly breaks down to a financial decision: the sr20de (normally aspirated) is $1250 for everything I need to swap it in, and makes comparable power with comparable weight.

drummingpariah on 08:23:09 AM / 10-Jan-11
I've done quite a bit more research, and decided that an sr20de makes significantly more sense.  It mostly breaks down to a financial decision: the sr20de (normally aspirated) is $1250 for everything I need to swap it in, and makes comparable power with comparable weight.

a qr in stock form has more hp and tq than a sr could ever ask for. and no, the weight isnt really comparable:  you get more hp and tq, and less weigh from a physically smaller engine.

Im not trying to shit on your choice, dont get me wrong, I understand finances are tight, mine are too.
But the qr outperforms the sr AND ka in every aspect.

I dont think its going to be as custom of a job as everyone is making it out to be, no more than a ka or sr or vg30 in to a ca20 car would be.

Well vg30 isn't that hard because SE parts can just be moved over. This will require a lot more fab than just a trans mount.

The sr20de is built-up from the factory.  A set of rings, bearings, and some valvetrain support and it's a near-bulletproof engine.

The transmission issue is my biggest problem.  There just aren't enough rwd qr25de's in junkyards yet, but plenty of morons replace their ka24de with an sr20de and later realize that it was a step sideways, not a step up.  They just bought the sr for its flashy name and technical advantages.

^ your right on the junkyard thing. Ive been cruising the sentra forums for a while hoping to snag one. Im putting in a ka for now till i find one. But, as soon a i find a qr and everything lines up (finances and such) im giving the qr project a full green light.

Good work broski dont let these fools change ur mind. I think its awesome ur doin qr instead of ka or sr its time some one tried another nissan i4