Whats wrong with towing at 500hp? I love being able to beat 3 series bmw's and A4's while towing. Especially the fact that I can't push the pyro past 1100. But thats why I run with twins. I can tow with my box cranked all the way up and not encounter any issues.

For not much more than the price of some of these stainless singles, you can have yourself a nice set of towing compounds. That will spool and cool great. Judging by your sig. You will want to do further trans upgrades if you plan on running 500hp.
Sean

Sean, you are right about twins. I was referring to a single turbo. With all turbos you make a compromise...
Small turbo = stock or less expensive, fast spool up, good towing, limited power
Bigger turbo= laggy, not so good for towing, excellent power in the higher RPM/performance
Twins= best of both worlds, draw back is price. (this is negated if you can make your own)

why do you say that about my trans? i know i should do a input shaft. dave said it will be fine .

Did you tell Dave you want to tow at 500HP? that is a lot more strain on a trans than driving at 500HP. Billet input and possibly a billet intermediate. I would call Dave and make sure he knows your plans so you can avoid problems later.

i will still talk to him. i have to call him this week anyway. but i do turn my blue chip off when towing if i leave it on the stuck smoke way too much. (never thought i would say that...lol) and that blue chip is most of my power right now...

Towing at 500 heavy will probably get to much radiator heat. I usually tow at up to 400 and don't have much problems. The small twins I run work great towing , at 24,000 it will maintain speed on almost any hill. The real trick towing heavy is rpm's. If I see a big hill coming I usually kick it out of overdrive, the twins will get instant boost at 1800 or higher rpm's.
Turbos are a hard thing to size right, a hair to big and no response a hair to small and they choke to death on the top end.

Dave definitely knows his stuff better than I do. I just figured with stock clutches in there that you would be risking things running that much power, and towing.

As far as the draw back of twins being expensive, that is true. However, if you use your stock charger even having someone else build you a set up you aren't that much more than some of the singles on the market. These stainless housing singles run roughly 2200 plus the cost of a down pipe, etc... All said and done you are close to 2400 bucks. I'm sure you could get a nice twins set up for 3000 or less that used your stock charger and an s400 or ht3b.

Sean

what would be a good injector to run with either 1 of these turbos? and whats the difference between the 62/71 and the 64/65 ?

well to state the obvious.

The 62/71 has a 2mm smaller compressor wheel. However the turbine wheel is 6 mm bigger. This equates to a slightly slower spool up but lower drive pressures and better flow on the top end. I would think the 64/65 would be a bit more prone to surge because the difference in the wheels isn't very big. but that is my PO. never messed with any of the 65mm S300s.

My 62/71 is kind of slow to spool until it hits about 10 PSI. After that it is an instant jump to 40PSI. I think it spools by about 18-1900 RPM. Never really pay attention i guess.

On injectors I would run some 100-150. Turn the boxes off and the charger will chugg along happy as a clam with either of those injectors.

Though I did notice you have a HR IP. I would still probably run some 150's though. Still a good driving injector but if your driving it hard it will probably overfuel the 62. Might not hurt to consider a 64/71 at that point.