Billy, let me understand your perspective. The NSX's OEM suspension was developed by Senna's input as well as extensive testing afterward by Patrick Johnston. Yes, that was some 20 years ago, and yes technology has advanced where "drivers" can improve on pretty much all aspects of any model year NSX.
Having said this, is your position that a driver like Dave with limited seat time, and quite a high level of being risk averse, is in a position to have reached the limits of the OEM set up in such a short time so much so to do all the significant suspension and alignment changes that you are recommending - even with a CTSC?
Dave's car is NOT a track car and he tracks on street tires hence a racing suspension, IMHO, is not an appropriate advice - perhaps the 91 alignment is if he is willing to accept tire wear. The OEM brakes are fine but we have already talked about any tracker needs better pads and I believe Dave has shopped for those before. We agree regarding baffled pan - but again let's not oversell this in its critical importance with street tires or tracks that are pretty flat. Some of us locals have tracked for 8 years and at least 6-10 tracks per year with the OEM pan with no issues - but yes there is a statistical probability that it might happen.
Dave, regarding tire pressure with your current OEM set up, the OEM tires like hot at the track no more than 33/40 psi. Try to to see how that works with your aftermarket tires and adjust by no more than 2 psi at a time (don't putz around during cool down lap if you are checking tire pressure - also check tire temperatures across if you have the tool). The tire pressures do make a huge difference in feeling planted vs. loose and greasy if they are too hot.
I still think for now, the best value for Dave is seat time (professional school is great if it is in the budget), toe link/rear bushings and sway bars. Baffle too :wink:
The amount of testing that productions cars undergo is unbelievable from NVH testing, suspension testing, acceptable tire wear, handling characteristics (safe understeer), etc... Everything is a system designed to meet certain standards set by the OEM manufacturer. Once you change the tires from stock, you do change the handling, balance, NHV, and every aspect that made the OEM car meet those standards. This does NOT mean the NSX's handling and performance can't be improved over stock and its quite the contrary. With that in mind, the NSX's alignment and suspension setup is a substantial compromise between tire wear, safe handling on the street, etc... and not for peak performance.
For the OEM loyalists: the stock setup was not designed for the added power of a super charger, the stock setup is not designed for ideal track use (and thus there are better track/street compromises in alignment, etc...). If you want to go as far as saying the NSX's suspension was 'setup by Senna' -while he did a lot of testing, that was for the NA1 and whatever continued development until his unfortunate passing. So the NA2 wasn't directly from his feedback. Continuing the argument, once he put the NSX-R bar on the front of his car, the OEM setup is now irrelevant because the front swaybar is now stiffer - so the alignment and handling isn't what OEM-specd. He dosn't have the NSX-R suspension and the front bar was not 'designed for the regular base NSX suspension'.
While I dont agree with the above argument from OEM-loyalists, I will say that through testing, there are better alignments for someone who occasionally tracks their car that won't be too bad in terms of tire life but will greatly improve the handling characteristics and stability of the car. Also through testing, different tire sizes, swaybars, spring rates, ride height/rake, dampers, aero, etc... all can be improved over the OEM suspension. The stock 91 alignment is also not necessarily 'better' for track use and I will also say that
I wasn't too fond of the 02+'s alignment for track use and actually found it harder to drive and more 'twitchy' at the limit than a car with a more track-oriented alignment.
Going back to my first statement, the OEM alignment and setup for the NSX isn't the best IMO for someone who occasionally tracks their car. If they are willing to give up a little more tire wear for stability and performance on the street and track, faster laptimes will be the result. I do think the NSX-R front bar was a good addition to his setup to reduce steady-state front grip for stability and comfort (at the limit), but I also feel that a non OEM alignment would be better for his application.
As far as "Race" suspension goes. My recommended KW V3s are not an all out 'racing' suspension. KW calls the V3: "race technology for the street" and the V3s are
OEM-equipped on the
Mercedes CLK63 and SL65 Black Series cars -so the ride quality has to meet Mercedes' standards. The V3s are a great street/track suspension that is more comfortable on the street than most suspension options out there. With the double-adjustable dampers, the handling characteristics can be further improved and fine-tuned for the given tire size/sway bar/etc...
So, a better more track-oriented alignment will raise the performance level of the car on track and can also improve the stability of the car at the limit. With a quality suspension that is as adjustable as the V3, his suspension can be fine tuned for the tires/power level that are now above and beyond the capabilities of what the OEM setup was designed for. I will say that for his setup an alignment is a first on the to do list while it's necessary anyway after a suspension upgrade.
As far as tires go, the Dunlop Star Spec is within a couple seconds of R-compound tires. So the argument of street tires being 'mandatory' before R-compounds has become almost irrelevant in recent years from the tire wars of the manufacturers to make better and better street tires. Both the Starspec and the Yokohama ADO8 are some of the best street tires out there and the grip levels are quite impressive.
I have stated my opinion on the tire pressures many times on many threads. Overall, street tires don't like being too much higher than 40psi HOT and in most cases make the most grip at around 36-38psi hot. Since we are looking for stability and slight understeer, maximizing the rear tire's grip by targeting the 36-38psi hot in the rear would be ideal. Because of the front tire's smaller size (and depending on the alignment), having similar tire pressures front and rear with a proper alignment is usually better. I target 36-38psi HOT ALL AROUND which means for track use 30-32psi is usually a good COLD starting point.
When driven at the capabilities of what an NSX with modern (02+) 215/255 width tires, a
stock NSX with modern "street"-classed tires
CAN generate enough grip to cause oil starvation and lose a rod bearing on a long sweeping right-hand corner under sustained throttle. Without any baffling, and since the sump pickup is on the right side of the pan, driving the NSX at its capabilities (which albeit is quite high) can lead to problems. Again, there is no reason not to invest in a quality baffle like STMPO.