RX8 injectors differences
#23
Cpt. Slow
Thread Starter
iTrader: (25)
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 14,440
Total Cats: 1,214
I'd kinda worry about 250 with e85. After hearing some testimonies on these injectors, I think they'd be fine with pump gas. I've never tuned with E85, but I hear it requires a LOT of gas. Might wanna consider an adjustable fuel pressure regulator, or larger injectors.
#25
Senior Member
iTrader: (2)
Join Date: Mar 2014
Location: Meridian, Mississippi
Posts: 628
Total Cats: 44
Keith
#27
hi, all
Since there was only one person that has replied on a topic that has experience with these injectors i will ask again
Today i picked up a couple of yellow 4450 ones. And a few hours later i got a mail that some has a couple of purple 4460.. At first i was looking for this one but the rx-8 model that has these injector where never imported to the netherlands. So i gave up searching and picked up de the yellow ones.
Does anyone more has experience with these 4460 purple ones?
Since there was only one person that has replied on a topic that has experience with these injectors i will ask again
Today i picked up a couple of yellow 4450 ones. And a few hours later i got a mail that some has a couple of purple 4460.. At first i was looking for this one but the rx-8 model that has these injector where never imported to the netherlands. So i gave up searching and picked up de the yellow ones.
Does anyone more has experience with these 4460 purple ones?
#30
Senior Member
iTrader: (2)
Join Date: Mar 2014
Location: Meridian, Mississippi
Posts: 628
Total Cats: 44
Keith
#31
Retired Mech Design Engr
iTrader: (3)
Join Date: Jan 2013
Location: Seneca, SC
Posts: 5,012
Total Cats: 859
Bringing this back to get some input on my build. See Se Post 102
I would think I should be at those kind of power levels at 80% DC on these injectors. I know both @Savington and Emilio have also used them in the past.
Note that I have gone to a return-style fuel system.
Should I be looking at the DW100 or DW200 to replace my fuel pump?
I would think I should be at those kind of power levels at 80% DC on these injectors. I know both @Savington and Emilio have also used them in the past.
Note that I have gone to a return-style fuel system.
Should I be looking at the DW100 or DW200 to replace my fuel pump?
#32
Retired Mech Design Engr
iTrader: (3)
Join Date: Jan 2013
Location: Seneca, SC
Posts: 5,012
Total Cats: 859
I ran an experiment this morning. Nice and cold, so already 1% more fuel requested due to MAT Corr. Then I changed the target AFR from 11.7 to 11.4 (Fueling is "Incorporate AFR")
Ran full pedal. IDC went to 108%. At that point, Target AFR was 11.4, but Measured AFR was 11.9. I'm pretty sure I'm no longer controlling fuel.
So, for now, I'm backing down max boost at high RPM so that I'm at least below 100% IDC.
Question remains: Would this be helped by a new pump or not? Or am I at the limit of the Yellows with 3-bar, MAP referenced fuel system.
Ran full pedal. IDC went to 108%. At that point, Target AFR was 11.4, but Measured AFR was 11.9. I'm pretty sure I'm no longer controlling fuel.
So, for now, I'm backing down max boost at high RPM so that I'm at least below 100% IDC.
Question remains: Would this be helped by a new pump or not? Or am I at the limit of the Yellows with 3-bar, MAP referenced fuel system.
#34
Retired Mech Design Engr
iTrader: (3)
Join Date: Jan 2013
Location: Seneca, SC
Posts: 5,012
Total Cats: 859
Original Stock with 95k miles.
I've pretty much decided to back down from 194 to 188kPa, which gives me 96% Inj Duty Cycle until I have the car properly dyno'ed, which will be who knows when.
I've pretty much decided to back down from 194 to 188kPa, which gives me 96% Inj Duty Cycle until I have the car properly dyno'ed, which will be who knows when.
#35
I guarantee you that your fuel pressure is dropping off substantialy. You are out of fuel pump capacity by a large margin. To complicate things it's not like your fuel pressure will drop off consistently every time you go WOT, battery voltage, temperature, ECT. Will all affect how much the pressure drops off so you will see large variations in pressure. I wouldn't continue to run the car at these boost levels until you get a pump.
From what I've read you'll get so.e pressure creep at idle with any pump larger than a walbro 190. The 190 will easily support 300whp, so there isn't a good reason to run anything bigger.
From what I've read you'll get so.e pressure creep at idle with any pump larger than a walbro 190. The 190 will easily support 300whp, so there isn't a good reason to run anything bigger.
#36
Retired Mech Design Engr
iTrader: (3)
Join Date: Jan 2013
Location: Seneca, SC
Posts: 5,012
Total Cats: 859
I guarantee you that your fuel pressure is dropping off substantialy. You are out of fuel pump capacity by a large margin. To complicate things it's not like your fuel pressure will drop off consistently every time you go WOT, battery voltage, temperature, ECT. Will all affect how much the pressure drops off so you will see large variations in pressure. I wouldn't continue to run the car at these boost levels until you get a pump.
From what I've read you'll get so.e pressure creep at idle with any pump larger than a walbro 190. The 190 will easily support 300whp, so there isn't a good reason to run anything bigger.
From what I've read you'll get so.e pressure creep at idle with any pump larger than a walbro 190. The 190 will easily support 300whp, so there isn't a good reason to run anything bigger.
Also, idle and cruise did not change, so that indicates that indeed, the DW100 does not over-power the FPR (1999 European MAP referenced).
#37
10% is a nearly a full AFR point, so tOmato / tomAto.....It was quite a bit.
Considering the dw100 flows 165 lph it won't over power the regulator. I just swapped pumps to a walbro 190 because I was loosing pressure at WOT and found a 255 walbro in the tank, I'm running a fuel pressure sending unit and saw a 12 psi drop in pressure at high flow conditions. It was rocking up to 74psi at low flow and dropping back to the NB 62psi at wot. I just thought my sending unit wasn't calibrated, but ends up I had the opposite issue that you did.
Glad you got it fixed.
Considering the dw100 flows 165 lph it won't over power the regulator. I just swapped pumps to a walbro 190 because I was loosing pressure at WOT and found a 255 walbro in the tank, I'm running a fuel pressure sending unit and saw a 12 psi drop in pressure at high flow conditions. It was rocking up to 74psi at low flow and dropping back to the NB 62psi at wot. I just thought my sending unit wasn't calibrated, but ends up I had the opposite issue that you did.
Glad you got it fixed.
Thread
Thread Starter
Forum
Replies
Last Post
StratoBlue1109
Miata parts for sale/trade
21
09-30-2018 01:09 PM