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| CVTC (Constant Valve Timing Control) varies cam at all times, which is better than the Nissan SR20VE or Honda VTEC -- which only has two positions. | CVTC (Constant Valve Timing Control) varies cam at all times, which is better than the Nissan SR20VE or Honda VTEC -- which only has two positions. | ||
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| + | [[Category:Engine Removal And Installation]] | ||
| <blockquote><hr>the new enigne is 13 percent lighter than the SR20DE and ... 30mm shorter<hr> | <blockquote><hr>the new enigne is 13 percent lighter than the SR20DE and ... 30mm shorter<hr> | ||
Revision as of 08:13, 23 November 2006
The Nissn QR25DE engine is the replacement for both the KA24 and SR20. It is more powerful than the SR20, yet lighter than either.
Will you be the first to fit one of these beauties into a 1200? They've been on the market six years now ...
Contents |
Horsepower
200hp from a stock Sentra/Altima engine?
quote:The cylinder head ... flows exceptionally well--better than any SR20
Compare to the SR20DE in the SE-R Spec V at "only" 175hp. The run-of-the-mill QR25DE in all Sentras makes 170hp. The SR20VE (Neo VVL) only makes 187hp.
CVTC (Constant Valve Timing Control) varies cam at all times, which is better than the Nissan SR20VE or Honda VTEC -- which only has two positions.
the new enigne is 13 percent lighter than the SR20DE and ... 30mm shorter
Features =
- 132 kW/180 ps @ 6000rpm
- 181 lb. ft. /245 Nm @ 4000 rpm
- 9.5:1 compression
- direct ignition (coil-on-plug)
- sequential Multi-point EGI (EFI)
- variable cam timing (37 degree range for intake)
- twin balance shafts
- drive-by-wire throttle body
- dual intake runners
- non-rising rate fuel pressure
The QR25DE was designed to eventually replace both the SR20DE and the KA24DE ... light and powerful like the SR20, and fuel efficient and torquey like the KA24DE.
Fitments
Used in:
- 2002 and up Sentra
- 2002 Altima
- 2000 and up X-trail (not sold in USA)
- Presage (minivan)
- Bassara
Transmissions
available with 4-speed Automatic (E-ATx) or the XTRONIC CVT trans -- all FWD layout with or without awd
How would this fit to a rwd vehicle? An adapter plate could be fabricated. But which transmission would work best?
Tuning Potential
It is the light valve springs, not the long stroke, that are responsible for the low, 6100 rpm redline.
This engine was designed for efficiency, not ultimate performance. So all the parts are lightweight.
- 200hp is possible with custom exhaust
- redline extension might need new pistons and conrods
- boost would need new stronger pistons
- QR20DE (Japan model) short-stroke is only 150hp -- but can rev to 8500 rpm?
- QR18DE