PT6776 what fuel system

[Turbo Steve]

looking for mid 10's what fuel system will be enough for a stock block car race gas no alky.

 

[RUQWKNF]

Here is what I would do on a streetable car.

- Hot wire kit
- Walbro F2000169 fuel pump with install kit (Walbros replacement part number from the GSS340)
- Accufab adjustable fuel pressure regulator
- Mototron 60# injectors
- Turbo Tweak Pro chip
- Volt booster
- New fuel filter
- Remotely mounted fuel pressure gauge, not rail mounted as they will become inaccurate over time due to heat and vibration.
- Modify the fuel pump hanger by removing the neck down portion on the feed line and use a straight piece of FI hose in place of the fuel pump pulsator dampner. (See pic below.) Neck down portion is underneath the hose in this picture.

The 60# Mototron injectors will safely support up to 750 fwhp when maxed out. The PT6776 turbo will support up to 780 fwhp when pushed to around 30psi. Mid 10's on a full weight 3650# Turbo Buick needs to make approximately 625 hp to the tires. Taking into account drivetrain losses of 18%, puts flywheel hp at around 735 - 737hp. Obviously, if the car weighs less with driver, it won't take as much rwhp to run mid 10s. 3450#s with driver only needs to put down 590 rwhp to run 10.50s. 3450# is a stretch tho and is pretty much a skulled out race car IMO.

With this above fuel system, you will need to have the chip burned with max duty cycle at the highest setting on the TT chip. In other words, at his 152 fuel setting under WOT, it needs to have the injector duty cycle at about 100% to have enough of a safety cushion. The Mototrons are typically rated anywhere from 60# up to 65#, depending on where they are flow matched.
FYI, they don't lock up under very high fuel pressures like some of the others do. I had a customer run these very same injectors on a 3800 Series II turbo car (actually the fastest FWD 3800 series Grand Prix in the country, owned by Scott Cook of Intense Racing) all the way up to 100 psi without failure, so they can flow more at higher fuel pressures.
PTE matches these injectors to within 1% per set of 6, so if I was building this system, I would request a set that flow matched high. The volt booster will also give you a little bit of a safety cushion as well, due to the higher flow volume of the pump at 14.9v - 15.2v when the volt booster is activated. The Mototrons are a very good match for the PT6776 family of turbos. If you're not comfortable running your injectors close to max capability in order to make 750 fwhp, then you will need to have your stock ECM drivers changed over to low impedance drivers, as well as run 75# Delphi injectors. However, street manners will suffer with the 75# Delphi injectors.
I was able to average 29 mpg on my trip back home from Bowling Green last Sunday running this exact fuel system with Mototron injectors.
HTH

Patrick

 

[Turbo Steve]

thanks! I see we have matching T's DBM T's are the best