[Robert]

Originally Posted by wdodge45

Hey Robert,
Thanks for the quick response... At 16psi of boost we are 1250-1300hp give or take on the traction. I would like to be around 1500hp without running crazy boost. The motor is totally setup to handle this level of horsepower. My limiting factor is we don't have the 6 bolts per cyclinder so this is why I don't want to get into the higher boost numbers. I feeI I can increase the volume of airflow without higher boost numbers. I fell we can run 20psi max. safely but don't want to go much further. So with that being said any thoughts would help and even if that means new turbos, I just want to weight my options before dropping some coin and want to make sure what your thoughts are.
Thanks so much for the help...

Bill

Thanks for that additional info that helps a lot. Well, bottom line you have options. The 62-1 compressor wheel will give you a solid 10% more air than the 60-1 you currently have. That's per turbo of course so with 62-1 compressors being the only different part you should be able to hit 1500 HP at the same or very similar boost level and the turbine side wouldn't change so your boost curve should remain the same. That's the cheapest option available. The other option would be to run a pair of GT-K units. It sounds like you have T3 turbines now. If that is correct then you could run a pair of GT-K 550s with a similar size turbine housing. The GT-K 550 has the newer GTK61 compressor wheel which will outflow even the 62-1 at the same boost pressure you have. The downside if that is the most expensive option. The upside is the newer compressor wheel and ported compressor shroud will give you more power across the power band then the twin 62-1s. I hardly ever say what I'm about to say but in your case I have to make an exception. If I was you I would rebuild the units with a 62-1 compressor wheel as the only change. A couple of reasons for this. First it sounds like you have a set up you are very comfortable with. You know what it's going to do and when its going to do it. In a sand car I KNOW that's important. Especially if you are charging up a big hill and expect the engine to do a specific thing at a specific RPM in your climb. Given that you seem fairly happy with your set up and know how it will react the 62-1 compressor upgrades makes the most sense. It's flow profile and boost response is almost identical to the 60-1 you have now just with more CFM per turbo at the same pressure ratio. That get's you to the 1500 HP goal you want without having to up the boost or alter your cars boost repsonse at all. The flip side is if you go with new turbos you have a chance to completely change things around. You could play with all the new options Turbonetics has available and pick the one you want based on what your long term goals are. If 1500 HP is going to be it for a while stick with the 62-1 compressor wheel upgrade. If you have a feeling you'll want 2000 HP in a couple months then we should talk new turbo. If I was you, 62-1 upgrade is the way I would go.