Postby smj999smj » Wed Mar 05, 2014 12:36 am
I can't really say which is the best deal without seeing any of the vehicles for myself. I do prefer the R51 over the R50, but each has its good and bad points. As far as the contamination issue, there's a seal in the integral radiator trans cooler that fails. There's a YouTube vid by a shop that removed the cooler from the lower tank, placed it in a tank of water and applied air under pressure to show the leak. Seems Calsonic had a bad run during the mid-2000's as they also have problems with the lower tanks cracking and leaking on the Titans. The bypass is one way to address the issue. My choice was to install an aftermarket radiator I got from Parts Express on Ebay for $92, free shipping and lifetime warranty. Last I checked they were going for around $74. Yeah, it was a made in China unit, but the quality appears to be good and the fit was perfect. Only difference I noticed was that the petcock was a different thread pitch than the original, but it came with one so it's not an issue (just something to remember if it ever needs to be replaced). I got all new foam seals from Nissan.
My biggest issue with the R50 is the handling. Even with a good set of rear suspension links, IMO, the R51's seem much more secure and better riding. I also like the fact that the R51's have a full frame under the body, not a unibody, although the unibody design is very good on the R50 and is used by other manufacturers in their SUV's. The VG33E R50 is definitely a different driving experience than the VQ35DE sister. The former gives adequate power where the later gives more than enough. I like the body styling of the later better, but there's something to be said for the good ol' reliability and simplicity of the VG33E engine. If you replace the timing belt on them, the only thing that every seems to go bad on them (engine-wise) is the distributor, rear main seal and rear oil pan seal.