sevanseriesta

iTrader: (34)

Ok as some of you have seen my build I have a question about spooling the twin 76's. I have completed the build I am getting ready to put some exhaust on it. My question is if I put a more restrictive system on it do you think it will help spool. I do not think I am going to have and issue with back pressure but I could be wrong. The system has not been run yet.

Silver_TransAm

iTrader: (2)

The more free the flow the faster the spool. IMO.

rubbersdown

iTrader: (1)

I would not restrict the exhaust but I have seen guys make plates that slightly reduce the size of the turbo inlet flange (by like 20-30%) and it greatly helped them spool faster.

Zombie

iTrader: (2)

Back pressure after the turbo = slow spool

onfire

iTrader: (17)

I'm running 76's 0.81ar with 428 cubes....takes a lot to spool them for the dragstrip...If you have a 347...do some serious homework on the turbines.

sevanseriesta

iTrader: (34)

Yeah I am trying to figures some things out, without going C02 cause I really do not understand much about it. Ill trade you turbo's. LOL

sevanseriesta

iTrader: (34)

I am going to go with a 4" all the way back, so no restrictions there. I really do not want to spray cause I just don't want spend anymore money.... I may run it and see what happens and go from there.

slow67

iTrader: (2)

The only time I have seen this help, is if it is a divided tang scroll, and they completely block off 1 side of the scroll.

67Firebird455

iTrader: (27)

Do not run TOO large of a system BEFORE the turbo is the point he's making. Theoretically it will be more area where exhaust will be before it is pressurized when it hits the turbine. If you find a happy medium, you will see an increase in spool time. I know because I had LT's on the TA, and went with manifolds and it spooled quicker. The volume needing to be compressed (or back pressured in this case) is smaller, so it forces the wheel to turn sooner.