BoostnTBSS

iTrader: (-1)

well Am putting the S88 away for now and stepping back to a GT42 74 mm for now because i want it to spool a little faster for now (need my converter re-stalled) also i am getting alot of surging @ low boost (11psi and lower) and 12 psi and 2600lbs on the street is too much with the S88. so i have a brand new Gt42 74mm with 1.15 ex that will bolt up for now till i can get a custom 80mm built.. how many have gone over 650RWHP with a turbo like this? i will prob run a max of 18-22 psi just looking for some real data with a gt42 turbo..
348ci

DrTurbo

iTrader: (3)

We have maxed them out around 700-750rwhp. Also check with some members here. They have ran them and maxed them out as well.

BoostnTBSS

iTrader: (-1)

Well got it on and all i can say is insta boost..... have a 7 lb spring now and it is at full boost as soon as yo floor it LOL.. 10-20 psi to come later this week...

DrTurbo

iTrader: (3)

Yes, instaspool for sure. Problem is back pressure will be HIGH if you plan to try to push it. Check to make sure you don't start pushing water.