I have a garret gtx55 91 mm with 1.15Turbine Housings with terrible spool, approx 10 sec. engine v6 4.3l wonder how big difference you can expect if I switcj it to 1.00 af? Thanks!
yes converter is to tight and the can't make loser....It will be tune and or Converter related.
I have a Promod88 with 1.15ar on a 3.8L 6 cylinder and can spool from idle to 5500rpm and 25psi of boost in 5sec without any nitrous and around 3secs with a 40shot of nitrous
Stator is 19-35 , engine management system FAST XFI and a don't fink the make any dump system for 4L80e =( the problem is 3600-4000 rpm i tried timing and fuelSounds like you need some tune-up work and possibly a converter dump if it's ok down track especially shift extension rpm. The 1.00 A/R would help but as above it will not get you there alone.
E85, Compression 9, timing on TB 28 degree ....Appreciate your time to meYou cannot be in closed loop on the transbrake. I tune that area with the 2-step set high so it doesn't activate during tuning. Tune it by making logs on the transbrake and get a good lean and mean fuel/timing map in those areas to give it the most chance of making maximum torque to get up on the converter. If its rich or timing too soft it will never get up on the converter. On something sensitive like that the air Density from day to day can have a lot of effect on it spooling. Generally speaking if its rich it from one day to the next it will sound kind of blubbery and labor to get up on the converter.
Timing on transbrake??
AFR in the area up to launch rpm/boost??
Miss understanding i have apox 38 degrees under build up and ON TB 28 degrees19-35 should spool no issues with 4.3litres.
You will want a lot more then 28 degrees on the TB below boost, Once it starts making some boost you can back it down. Im up around 38 - 40 degrees before it starts making boost.