Fueling for A-spec 3574R
#1
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Fueling for A-spec 3574R
Hi guys,
So my A-Spec 3574R for my FD should be shipping soon.
I need to know if I use 850cc primaries and 850cc secondaries with this kit whats the max safe boost I can run. I will be running a walbro 255lph fuel pump. Do I need an aftermarket FPR too?
Thanks guys...
So my A-Spec 3574R for my FD should be shipping soon.
I need to know if I use 850cc primaries and 850cc secondaries with this kit whats the max safe boost I can run. I will be running a walbro 255lph fuel pump. Do I need an aftermarket FPR too?
Thanks guys...
#2
Sponsor
iTrader: (41)
That should get you about 12-13 psi safely but each car is different. That turbo is capable of 20 psi+ and runing that low boost with it is a waste in my opinion. We had one on a car with a 550/1300 combo and it was running out of fuel by 15 psi. Get rid of the walbro. Put in a supra tt or bosch 044 pump and get some 1600s at minimum.
#3
F'n Newbie...
iTrader: (6)
I'll second what Ihor said. You're wasting the turbo with 850 secondaries. You might as well go ahead and upgrade your system.
I was using 850's for my primary/secondary when I had twins. Even then I was running out of fuel at around 380whp, you can EASILY hit 380 with that turbo off relatively low boost.
I was using 850's for my primary/secondary when I had twins. Even then I was running out of fuel at around 380whp, you can EASILY hit 380 with that turbo off relatively low boost.
#4
Original Gangster/Rotary!
iTrader: (213)
Definitely get rid of the walbro and look at a Supra pump or the RP upgraded Supra pump:
(8th picture down)
http://www.rx7.com/store/rx7/fdfuel.html
(8th picture down)
http://www.rx7.com/store/rx7/fdfuel.html
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#9
i know there are plenty of people driving with no issues. BUT ive personally seen 2 walbros fail on 2 seperate cars on the dyno resulting in engine failures. Why not just spend $50-100 more and get one the above mentioned pumps to save yourself some headache? the saying exists for a reason...you get what you pay for
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Thanks guys for all the input. Now let me change the question a bit. Ideally what fueling options would you guys suggest I take to have a good idle and capable of around 450whp.
Do I need a fpr
What size primaries and secondaries
Which fuel pump
Do I need new fuel rails
I am going to ditch the walbro and am leaning towards the bosch.
Thanks guys
Do I need a fpr
What size primaries and secondaries
Which fuel pump
Do I need new fuel rails
I am going to ditch the walbro and am leaning towards the bosch.
Thanks guys
#15
The one
iTrader: (5)
Thanks guys for all the input. Now let me change the question a bit. Ideally what fueling options would you guys suggest I take to have a good idle and capable of around 450whp.
Do I need a fpr
What size primaries and secondaries
Which fuel pump
Do I need new fuel rails
I am going to ditch the walbro and am leaning towards the bosch.
Thanks guys
Do I need a fpr
What size primaries and secondaries
Which fuel pump
Do I need new fuel rails
I am going to ditch the walbro and am leaning towards the bosch.
Thanks guys
http://www.rx7store.net/category_s/93.htm
The Extreme system we sell is popular and will support the HP numbers.
As far as pump you have a few options. The Walbro 400, Aeromotive, Bosch 044, Supra pumps will all do the job.
#18
SAE Junkie
iTrader: (2)
The factual rating of the Bosch 044 to work on is, in an ideal world, with proper wiring, and a well flowing fuel plumbing.
4000cc per minute pumping into a 4.5 bar head. To interpret this information, understand that 3bar / 43.5psi above pressure at sea level is the maximum base fuel pressure typically used with aftermarket adjustable fuel rails. Some RX-7s may use lower from the factory such as 36psi or so.
Anyway 4.5bar. 3.0 bar will be used by your fuel pressure. Leaving you another 1.5bar for the 1:1 fuel pressure regulator to use to match the intake boost change, and keep 3bar/43.5psi across the injector. This means you can use 1.5bar/21.75psi boost using a 3bar/43.5psi base, and flow 4000cc/min in that operating condition.
It all depends what you can do with ~3.2kg/minute of fuel flow.
4000cc per minute pumping into a 4.5 bar head. To interpret this information, understand that 3bar / 43.5psi above pressure at sea level is the maximum base fuel pressure typically used with aftermarket adjustable fuel rails. Some RX-7s may use lower from the factory such as 36psi or so.
Anyway 4.5bar. 3.0 bar will be used by your fuel pressure. Leaving you another 1.5bar for the 1:1 fuel pressure regulator to use to match the intake boost change, and keep 3bar/43.5psi across the injector. This means you can use 1.5bar/21.75psi boost using a 3bar/43.5psi base, and flow 4000cc/min in that operating condition.
It all depends what you can do with ~3.2kg/minute of fuel flow.
#20
Senior Member
iTrader: (1)
Thanks guys for all the input. Now let me change the question a bit. Ideally what fueling options would you guys suggest I take to have a good idle and capable of around 450whp.
Do I need a fpr
What size primaries and secondaries
Which fuel pump
Do I need new fuel rails
I am going to ditch the walbro and am leaning towards the bosch.
Thanks guys
Do I need a fpr
What size primaries and secondaries
Which fuel pump
Do I need new fuel rails
I am going to ditch the walbro and am leaning towards the bosch.
Thanks guys
So Basiclly I have a fuel pump and injectors and THATS IT! I actully bought the injector 2nd hand too.
This car has had the same turbo and injector combo since 2005 and has nearly 50,000 miles on it. I have had 0 pump and injector failures. This combo can work and run just fine for very cheap.So people claiming it won't work messed up sumwhere.
Maybe not 450 but damn close. Its more than enough power to make you smile. If you go to Rotary performances hp calculator 550/1300 at 100% can make 570fwhp.
O and don't push stock apexseals hard, they won't last long...aftermarket seal are more forgiving to high hp abuse, +1 for ra super seals.
#21
35r 13b first gen
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Just sayin, I have a Fd with a warblo 255 550/1300 combo, Stock fpr, with a 35r. I run 19-20 psi and see high 90's injector duty, have trapped 98mph in the1/8 on street tires using 93 octane, to indicate HP, as I never put the car on a dyno. I don't drive on the dyno, so y the hell would I tune the car there .
So Basiclly I have a fuel pump and injectors and THATS IT! I actully bought the injector 2nd hand too.
This car has had the same turbo and injector combo since 2005 and has nearly 50,000 miles on it. I have had 0 pump and injector failures. This combo can work and run just fine for very cheap.So people claiming it won't work messed up sumwhere.
Maybe not 450 but damn close. Its more than enough power to make you smile. If you go to Rotary performances hp calculator 550/1300 at 100% can make 570fwhp.
O and don't push stock apexseals hard, they won't last long...aftermarket seal are more forgiving to high hp abuse, +1 for ra super seals.
So Basiclly I have a fuel pump and injectors and THATS IT! I actully bought the injector 2nd hand too.
This car has had the same turbo and injector combo since 2005 and has nearly 50,000 miles on it. I have had 0 pump and injector failures. This combo can work and run just fine for very cheap.So people claiming it won't work messed up sumwhere.
Maybe not 450 but damn close. Its more than enough power to make you smile. If you go to Rotary performances hp calculator 550/1300 at 100% can make 570fwhp.
O and don't push stock apexseals hard, they won't last long...aftermarket seal are more forgiving to high hp abuse, +1 for ra super seals.
#23
Original Gangster/Rotary!
iTrader: (213)
It's great that this is your experience but one car doesn't make the case for all 13,000 FDs in the US. When it comes to the fuel system, cutting corners on a modded turbo rotary is a recipe for disaster IMO.
Just sayin, I have a Fd with a warblo 255 550/1300 combo, Stock fpr, with a 35r. I run 19-20 psi and see high 90's injector duty, have trapped 98mph in the1/8 on street tires using 93 octane, to indicate HP, as I never put the car on a dyno. I don't drive on the dyno, so y the hell would I tune the car there .
So Basiclly I have a fuel pump and injectors and THATS IT! I actully bought the injector 2nd hand too.
This car has had the same turbo and injector combo since 2005 and has nearly 50,000 miles on it. I have had 0 pump and injector failures. This combo can work and run just fine for very cheap.So people claiming it won't work messed up sumwhere.
Maybe not 450 but damn close. Its more than enough power to make you smile. If you go to Rotary performances hp calculator 550/1300 at 100% can make 570fwhp.
O and don't push stock apexseals hard, they won't last long...aftermarket seal are more forgiving to high hp abuse, +1 for ra super seals.
So Basiclly I have a fuel pump and injectors and THATS IT! I actully bought the injector 2nd hand too.
This car has had the same turbo and injector combo since 2005 and has nearly 50,000 miles on it. I have had 0 pump and injector failures. This combo can work and run just fine for very cheap.So people claiming it won't work messed up sumwhere.
Maybe not 450 but damn close. Its more than enough power to make you smile. If you go to Rotary performances hp calculator 550/1300 at 100% can make 570fwhp.
O and don't push stock apexseals hard, they won't last long...aftermarket seal are more forgiving to high hp abuse, +1 for ra super seals.
#25
Eats, Sleeps, Dreams Rotary
iTrader: (52)
I would highly recommend not going with a 850cc primary.
I am currently using:
Bosch 850cc Pri
Bosch 1680cc Sec
KG Parts Rails
Aeromotive FPR
SaRD 280lph pump (Supra)
FJO injector driver
I wish I would have done more research before going with this setup. All works very well except my 850cc primaries. Driveability is a little rough and leaning out my idle is futile. I have tons of fuel but I don't have that OEM smoothness. You can also consider keeping your 550cc OEM primaries, and using a 1680cc Bosch or ID 2000 secondary. The gap is large but a good tuner will have no problem smoothing it out. I will be upgrading to Injector Dynamics injectors once I start my 500whp build. Do some research on the ID injectors. They use a superior Bosch design where atomization and tuneability has far surpassed the old Bosch design.
The new setup will be:
ID 720cc Pri
ID 2000cc Sec
KG Parts rails
Aeromotive FPR
Dual SaRD 280lph pumps (Supra)
No need for resistors or an FJO injector driver with the ID's either. They are the naturalistic high impedance injector that Power FC's love. If you are using a Mictrotech, this will not matter.
https://www.rx7club.com/showthread.p...ector+dynamics
I am currently using:
Bosch 850cc Pri
Bosch 1680cc Sec
KG Parts Rails
Aeromotive FPR
SaRD 280lph pump (Supra)
FJO injector driver
I wish I would have done more research before going with this setup. All works very well except my 850cc primaries. Driveability is a little rough and leaning out my idle is futile. I have tons of fuel but I don't have that OEM smoothness. You can also consider keeping your 550cc OEM primaries, and using a 1680cc Bosch or ID 2000 secondary. The gap is large but a good tuner will have no problem smoothing it out. I will be upgrading to Injector Dynamics injectors once I start my 500whp build. Do some research on the ID injectors. They use a superior Bosch design where atomization and tuneability has far surpassed the old Bosch design.
The new setup will be:
ID 720cc Pri
ID 2000cc Sec
KG Parts rails
Aeromotive FPR
Dual SaRD 280lph pumps (Supra)
No need for resistors or an FJO injector driver with the ID's either. They are the naturalistic high impedance injector that Power FC's love. If you are using a Mictrotech, this will not matter.
https://www.rx7club.com/showthread.p...ector+dynamics