Quote Originally Posted by Quik View Post
now im curious to as why you think the 3.5 will be fine with precision specifically made the outlet 4". Parish also stated having backpressure issues with the pt88 and a 4" exhaust. He also has spoke of rpms in the low6s but you say that combo can turn high rpms. i asked on Ls1tech about spinning my 408 close to 7k with the pt88 and everyone spoke up saying it would run into backpressure issues past past 6300.
Mighty mouse doesnt even turn that many rpms and you want to do it with a larger motor. should of went with precsions 91mm turbo instead.

the problem more lies on being a T4 flange and high rpms

i believe you made the 3.5 downpipe instead of 4" for cost of price, which is fine for most ppl but why go thru all trouble of spending good money on a large motor and good turbo and cheap out on using a small downpipe? the cost difference isnt enough to offset the build
wow someone is getting all worked up, just becuase I think something different then the masses.
Cost has nothing to do with anything I build. Nope nothing at all.. Precision is the one the spec'd this turbo for this application. They told me 3.5 would be fine for the application, and until the custom tells me other wise the 3.5 will stay. We rely on mfg.s for there data, and our customers to tell us what is going and make changes from that point. Not becuase someone did something and it did not work for them. Different application different results. And my rpm was a guess....
If the customer has problem with higher rpms still no problem, just another quick hop into the shop and I will build one or maybe give him a set of twins.. It is not a big deal. Go have a beer and send me the billl... just one not made of money.