I started out racing wheel to wheel in SM. I've had some good finishes, and in 2005 me and my team won the 13 hour endurance race at VIR in SM. Then I got the bug and wanted to win overall.
Since then, the field has had some pretty fast cars enter, but the overall winner is usually something like an E36 BMW that's not terribly big on HP or even terrifically fast. But they are built and driven well and don't spend time off track. We tried upgrading an old Grand Am ST RSX first. We got the car to lap six second per lap faster than the winning BMW last year, but we were never able to make it reliable enough (and we had it up to 2.5 hours per stint on fuel!).
Along the way, I bought a Cayman S as a street car (and my prior rides have included a Lotus Elise, 996TT, M Roadster, E46 M3 convertible, 2005 STi, and others). I got one of the first Cayman's in the US (same with the Elise) and found it less than stellar, ultimately. Had it listed for sale for near six months when I decided to keep it and have Farnbacher-Loles do their "GTR" conversion on it. 3.8L X51 engine, GT3 suspension upgrades, Motons, 997 front bodywork, time trial legal roll bar, RS seats, etc. If it weren't for hitting a deer near the end, that car would have won the small bore class of the One Lap of America in 2008 and come in third overall (behind a factory Dodge Viper effort and a 600HP 996TT that won for the fifth straight year). That car is now amazing. But even it needs things like additional gearbox oiling!
So after all that, and considering all my options for my next 13 hour car, I decided to build an NSX. My line of thinking went like this...I set out my "requirements" list and looked for what car best fit it. The list went like this:
- must be under 53" tall to fit in the upper compartment of my liftgate trailer (seems easy, but an E46 M3 in race prep doesn't fit that!)
- rear wheel drive
- coupe (ie. no convertibles even with added tops)
- prefer double wishbone suspension
- needs to be able to hold a "big" fuel cell (ideally 25 gallons)
- able to be built to VERY reliably run 2:05's in qualifying trim on VIR full
- must have reasonable aftermarket support
- must be able to fit a 6'4" driver
Now, the 25 gallon fuel cell thing could be a problem, but we know we can do 18 and likely something between that and 25 gallons. Motons exist for the car, which is good because we have Moton training and our own shock dyno. There's "enough" aftermarket support otherwise, we've found. Our huge supply of RSX wheels are perfect for the front on the NSX. The Stoptech brakes we were already using on our RSX will transplant to the NSX easily with a few more parts that we already know we can get a la carte. I found a 1991 donor car for $15k. It runs and drives great, but it is a salvage title. We've got it nearly completely stripped and there is no sign of any frame tweak or damage at all, so it's perfect.
A stock NSX won't fit a 6'4" dude reasonably in a helmet. But we checked around (and Billy was a BIG help!!!) and found a stripped one with custom seat sliders (yes, we need sliders because we will also have a driver on this team that's, err, much less than 6'4") will fit someone that tall just fine.
Our RSX ran 2:09's on 235's with 230HP at 2600 pounds. We feel comfortable that we can get the NSX to 2600 pounds and near 300 reliable horsepower. It'll have 235/275's. Given the obvious advantages the NSX gets "for free" over the RSX (lower Cg, lower Cd, MUCH better suspension, better off the shelf aero, better balance, etc), we feel like hitting that 2:05 mark is possible. Yes, putting a cage in it isn't easy, but a custom cage is a custom cage. Being harder is a few hundred bucks extra in labor. Not a big deal.
We're going to start out with a few bolt ons and the stock engine and cage and go from there. It'll probably be just shocks, springs, brakes, NA2 ABS upgrade, and race tires to start. Well, that and EVERYTHING non-essential will be stripped (pretty much already is). We'll do the easy weight savings, too (bumper, battery, rear glass, etc). From there we'll start working on aero, fuel cell, and engine and transmission (not necessarily in that order). We definitely feel like the JDM 5sp will handle what we want quite well. There's an awesome LSD for it. And 300HP or so in NA form should be easy to get in VERY reliable form.
Cost for our fully prepped 2:05 machine? Should be well under the sticker of my Cayman S was originally. Perhaps under $50k with a lot of the work done ourselves. I don't care what anyone says, I don't believe you can build a Corvette NEARLY as reliable as the NSX for nearly the same money. It might go faster once done, but reliability? I just don't see it. Viper? Nope. Porsche? SURE, but you'll have 3x in it and be VERY afraid to hit anything. *shrug*
That's why I'm doing it. But if it were a $25k proposition for the donor car, well, I might be back on the E36 side of the world, too. But I really hate struts.
--Donnie