FUEL
TUNING Q:
I raised my boost pressure, now the car stops and shakes when I get the
boost going faster A:
You have found fuel cut.
Fuel will stop being pumped into the engine if the Toyota ECU detects 12
psi on ST165/ST185, and 17 psi on ST185RC/ST205
models. The Toyota ECU is set to activate fuel cut if it detects 4.4
volts from the Turbo pressure sensor.
The Turbo Pressure Sensor is reading boost from your intake manifold and
puts out 4.4 volts (roughtly) at
a certain boost level. First, if you haven't purchased/installed a
boost gauge, please do so. This is vital to
the tuning you are about to do. Second, to disable fuel cut we just
have to stop the computer from seeing 4.4
volts under any conditions. Go the MODS
section to find out how. Q:
I want to install a Supra TT fuel pump, is it hard? A:
No, it bolts right in.
If you can replace your fuel pump, then you can certainly install a Supra
TT. Being
that it's a Toyota piece, it bolts right in. Here are some pics.
ST185 Pump Supra TT
Pump Supra Pump On Celica Bracket Q:
Can I put in a Supra Fuel Pressure Regulator for high performance? A:
It may be possible, but the 2 are completely different in size and
mounting. Alot of
custom work would be required, for little or no gain. If you are
daring enough here
are the numbers:
ST185 FPR ND# 0970 83280 74070
JZA80 FPR ND# 2110 23280 46030 Q:
I'm searching for replacement upgrade injectors. What type do we
have? A:
See the fuel tuning page. Here is a quick
rundown: ST165
Low Impedance, Top Feed, Nippondenso style (440cc) ST185
Low Impedance, Side Feed, Nippondenso style (440cc) ST205
Low Impedance, Side Feed, Nippondenso style (540cc) Fuel
Pump Specs Holley In Tank
Fuel Pump
190lph/225lph 425/575hp Walbro
255
213 lph(40psi) @ 12v 255 lph(40psi) @ 14v RRE
DENSO Upgrade (eclipse) 150lph(43psi) @ 12v
210lph(43psi) @ 14v Supra Twin
Turbo
260lph(43psi) @ 12v 290lph(43psi) @ 14v (650 / 775 hp) 3000gt
VR4 / Celica
Gt4
180lph(43psi) @ 12v 225lph(43psi) @ 14v
(estimated) RX7 Twin
Turbo
210lph(43psi) @ 12v 260lph(43psi) @ 14v
(estimated) HKS In Tank
Upgrade
250lph(43psi) @ 12v
Bosch 0 580 254 984
Some specs courtesy RRE Fuel FAQ, careful, some of the max flow ratings
of popular upgrade fuel pumps are at 14v, not 12v.
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