Is it worth it to run 850's and 1200" or just go 550's and 1200's if your only running 16psi? i know the 850 primaries are almost impossible to get perfectly tune at the low end but will the 550's be enough for that much boost, and if so will they take 18psi?

 

What mods are you planning on doing??? it would also depend alot on that

 

I run 550's and 1300's @ 15psi. I see 85% duty cycles at full boost.

 

single turbo, i have a after market fuel pump, hks twin power, power fc obviously, ported motor, then the basic bolt ons.

 

I am running 550/1200, GT35R, stock ports, Nippo improved pump, running 85% duty cycle at 15psi boost in summer, closer to 90% in winter.

I am on the edge, and need bigger injectors..

 

what kind of hp numbers are you getting with that setup?

 

Only one "bad" trip to the dyno since going single. Bad breaking up above 5000 rpm. Discovered that my Crane HI-6R went bad after 6 years use. Only made 352RWHP at 15psi that day. Have not gone back since. Have changed to different plugs and added a different ignition amplifier. Power should be about 385RWHP.

 

i could live with that, i put down 320 to the wheels on my stock ported motor and 12psi so 385 would be killer

 

i was running the 850's but i think after this and what i have heard about the tunning issues imma switch back to the 550's

 

385 is just right, that's what I made back in Jan.

 

have you ran the track at 385hp?

 

I haven't, I don't know about Chuck. At Deal's Gap it was awesome though. I was very pleased with the power. The road race tires I have help...