Maximumyield: The only worry I have is longevity with a stock engine.
Yes I would agree it being a concern, heres a few reads for ya below, maybe it will make u a little more confident.
http://www.nsxprime.com/forums/showthread.php?t=93537
But I can say Lovefab has done a car with I think over 130,000 miles stock and the guy is happy with it, no issues so far, I heard this car looks like 130,000 on it too.
Also read the Craig Cathay posts too
http://www.nsxprime.com/forums/showthread.php?t=96310
http://speedvine.com/turbo-nsx-far-from-japanese-roots/
I believe he has 132,000+miles on a stock motor too pushing race fuel and 14.5psi at the track pulling a 10.45 on the 1/4 mile go figure, 1 of the fastest NSX's forsure and its completely stock except for a turbo.I believe these guys run around 8 psi to 10 for the street.
Posted from Craig, I think we are about to the limits of the 67mm turbo. We have been pushing the stock motor with my car, just to see what it will handle. So far there have been no problems, but with a poor tune you won't make it past 400rwhp.
The higher boost and power numbers are all done on 113 octane fuel.
Craig
P.S. I forgot to post it, but we are at 614rwhp now.
have a look at this amazing launch, but plug your ears lol.
http://www.youtube.com/watch?v=kjFOAoSj8-0
1 thing that comes to my mind is, the motor only is under heavy load when the turbo is on at high rpm's, If I do not go over say 4000rpm the car feels like a normal car almost.So it is not wearing the motor anymore than the SC or N/A engine.IMO
This is why I am not afraid to boost my car to 13psi or 14 psi next spring, now that I have got used to it and it is broken in.I believe i am at only 10psi, I can only imagine what it will be like.
But like I said u only are under boost for brief periods.Basically if I have say 510whp @ 8000 rpm I would have this same 510hp from more boost 13psi at say 6800rpm now, and more hp going to to 8000rpm now, like 550hp.
My belief again is less rpm more hp, may be easier on the car possibly revving less.Although if you are revving at 8000rpm all the time with boost too high, it can be danger on the engine if you are not carefull.
Also for the average amount of wear your NSX receives in a year is minimal, due to the average person only putting on say 3k to 5k miles per year.
Maybe useing boost 10% of this time, so only 500miles of abnormal abuse.
There are a few SC threads of the motors blowing due to higher intake temps and causing the engine to lean at hi rpms.The turbos run quite abit cooler intake temps, which is safer.
http://www.nsxprime.com/forums/showthread.php?t=95448
I think when its time, its time for anyone.A motor can give when it feels, now if u are under boost and it granades, I can understand.But no reports of this happening to my knowledge.You may get 100,000miles more with a turbo u may only get 500 miles more, no 1 can know how reliable it will be on a stock motor as there are no reports of any blowing up.
I am so amazed on these cars running boost 600whp on a stock motor.Craig has a video too at the track and looks like the front wheels are off the ground.The music is horrible on this clip but the car is crazy fast, for a stock nsx+turbo.
Shows the NSX is definately up to the task.
Also consider Cody from lovefab will help you out for service as much as he can.U can get new maps sent via email after doing several logs on to the cars running condition, and u can change the boost via the AEMS computer.
Here is a video (many have seen I am sure)of a Lovefab turbo 1st + 2nd gear pushing 400rwhp on a stock engine with 130,000+ miles on it.I also heard the guys drives it real hard mostly.
This NSX made 400.7hp/320tq at 8psi to the rear wheels, on a Mustang dyno. The factory 8,000RPM redline was retained; using the AEM EMS. So it's actually closer to 450-500hp at the crank. This car is using a base PT67 turbo along with custom exhaust and DC headers that are included in the Lovefab turbo kit.
http://youtube.com/watch?v=Q2dTYqWl7jI
One more note I think to say is also if you add a turbo to a stock NSX u can have some time to save and think about a future engine build while getting used to boost and haveing fun, and if u were running say 400whp on stock engine and rebuild in a yr or 2 and go forged pistons and sleeved block ect. basically a forced induction stage 2 kit, than u could boost the car to more potential after and allready have the parts to go to 750rwhp with a few buttons on the pc.If u dare to run that much.The supercharger is very limited(but maybe enough for many), and it seems boy's always want more.
Maximumyield