Fazdarx_8's Top Mount Turbo Build
#102
From recent logs on 4psi , it climbs to 170ish.
But forwhatever reason the car doesnt like to go past 7400rpm. Standing on the throttle it goes 7300,7400,7350, 7370.
Maybe to rich, wo2 is pegged, lc,1 reads 11.1.
Or maybe a broken intermitten plug wire, i have the bhr kit, just need to test the wires
But forwhatever reason the car doesnt like to go past 7400rpm. Standing on the throttle it goes 7300,7400,7350, 7370.
Maybe to rich, wo2 is pegged, lc,1 reads 11.1.
Or maybe a broken intermitten plug wire, i have the bhr kit, just need to test the wires
#103
Boostin'
FYI guys a .84 P trim turbine housing is about the same volute as a 1.06 GT35R( T3 or T4)
#107
Boostin'
I'm not calling you a liar, its just that something else was also changed( outside air temps makes a big difference), or you are basing this off just driving conditions.
I have done back to backs on many vehicles, piston and rotary. To get a 1000rpm jump takes going from a 1.19-1.32 down to a .84/.81.
I have done back to backs on many vehicles, piston and rotary. To get a 1000rpm jump takes going from a 1.19-1.32 down to a .84/.81.
#108
I wanted to share this
I have found it increasingly annoying that my stock wideband does not seem register in WOT situations, its placed 3 inches from the turbo inlet. this makes it challenging for tuning, so
I decided to install my second wideband in the downpipe about 10 inches away from my turbo, my Friend who tunes his RX-7 tunes this way so I thought I would try it aswell.
my hypothesis was that the stock wideband becomes saturated or something due to the extreme heat and pressure present before the turbo.
after the install was complete a test run was in order, in 3rd gear WOT, the stock wideband read 10.9 from the AP unchanged for the entire run.
the secondary wideband however read, 11.5 and a apv lean spike of 12.4
so it seems my hypothesis was correct for my situation.
I have added more fuel to my tables since then......
I have found it increasingly annoying that my stock wideband does not seem register in WOT situations, its placed 3 inches from the turbo inlet. this makes it challenging for tuning, so
I decided to install my second wideband in the downpipe about 10 inches away from my turbo, my Friend who tunes his RX-7 tunes this way so I thought I would try it aswell.
my hypothesis was that the stock wideband becomes saturated or something due to the extreme heat and pressure present before the turbo.
after the install was complete a test run was in order, in 3rd gear WOT, the stock wideband read 10.9 from the AP unchanged for the entire run.
the secondary wideband however read, 11.5 and a apv lean spike of 12.4
so it seems my hypothesis was correct for my situation.
I have added more fuel to my tables since then......
#112
Registered
iTrader: (25)
it doesn't matter, he just told you straight out, I was going to lead you around the long way to demonstrate how your assessment and logic is flawed, which is all too common around here
the O2 sensor will not read properly in a high pressure system, this is why it has to be installed after the turbo
.
the O2 sensor will not read properly in a high pressure system, this is why it has to be installed after the turbo
.
#115
Banned
iTrader: (3)
I'm not certain that this has anything to do with it - the temperatures are simply too high and the gas velocity too low for the pump to make its own reference. The heater just goes out of range.
Now, several of the early top-mount systems put the O2 sensor too far away - essentially in the physical stock location, which is too great a distance (in terms of piping) from the exhaust ports.
Another salient point is that the sensor, should the WG be VTA, must be unaffected by the gaping hole in the gas flow that this causes.
Now, several of the early top-mount systems put the O2 sensor too far away - essentially in the physical stock location, which is too great a distance (in terms of piping) from the exhaust ports.
Another salient point is that the sensor, should the WG be VTA, must be unaffected by the gaping hole in the gas flow that this causes.
#117
Banned
iTrader: (3)
The whitepaper on the Denso WB puts its thermal saturation point at 2000°F. It was essentially designed to work at 1700°F.
#118
Registered
iTrader: (25)
you would argue with GOD about the creation of the universe if you had the chance ... next time do your homework before you shoot your mouth off. Temperature matters, but you have nothing to indicate what the actual temp is or that the same thing still applies when temps are lower like in a piston engine or alternate fuel rotary ...
Reasons for Inaccurate Lambda Readings – Exhaust Back Pressure
Wideband Lambda sensors primarily count oxygen atom numbers through measuring the oxygen ion current within
the molten electrolyte of the sensor’s pump cell. The exhaust gas pressure affects this oxygen ion current – more
pressure means more atoms per unit volume and a higher current at the same Lambda. At a higher exhaust gas
pressure
�� a rich reading will appear richer than it really is, and …
�� a lean reading will appear leaner than it really is.
This is the main reason you should position the sensor after the turbo where exhaust back-pressure is lowest.
Wideband Lambda sensors primarily count oxygen atom numbers through measuring the oxygen ion current within
the molten electrolyte of the sensor’s pump cell. The exhaust gas pressure affects this oxygen ion current – more
pressure means more atoms per unit volume and a higher current at the same Lambda. At a higher exhaust gas
pressure
�� a rich reading will appear richer than it really is, and …
�� a lean reading will appear leaner than it really is.
This is the main reason you should position the sensor after the turbo where exhaust back-pressure is lowest.
#120
I did pre turbo in the beginning to avoid the lag, and at the time sfr and turblown had the sensers preturbo. They where tuned this way, and so was my car (by mm) and I dont ever recalling you telling me about the sensor position during our tuning session.
In any case its fixed.
In any case its fixed.