Fuel system upgrade
#1
Full Member
Thread Starter
Fuel system upgrade
Hey guys, i am in the process of upgrading my fuel system to accommodate my single turbo build. Im wanting to know if its possible to keep the factory primary rail + injectors and incorporate the new secondary rail shown in the picture, or should i just switch to an aftermarket primary aswell?
#2
Rocket Appliances
iTrader: (11)
Hey man
While you can utilize the oem primary rail and injectors with an aftermarket secondary setup I would not recommend it on a single turbo setup. With a single setup comes more power (typically) which means you have much less margin for error when it comes to fueling. I'm sure they're functional but I have a hard time putting much stock in the reliability of 25+ year old injectors.
Thing is aftermarket primaries and rail are cheap compared to the larger secondaries, so its probably worth it to just cover all your bases.
Skeese
While you can utilize the oem primary rail and injectors with an aftermarket secondary setup I would not recommend it on a single turbo setup. With a single setup comes more power (typically) which means you have much less margin for error when it comes to fueling. I'm sure they're functional but I have a hard time putting much stock in the reliability of 25+ year old injectors.
Thing is aftermarket primaries and rail are cheap compared to the larger secondaries, so its probably worth it to just cover all your bases.
Skeese
#3
Rotary Enthusiast
I kept the stock primary rail and injectors and modified to allow AN fittings and lines to match my aftermarket secondary rail.
Now I am looking to make more power and the easy way to get the fueling is an $120 primary rail and 2 injectors for a couple hundred more.
You might as well spend the money now and not have to worry about fueling, new lines, re tuning, etc... down the road.
Now I am looking to make more power and the easy way to get the fueling is an $120 primary rail and 2 injectors for a couple hundred more.
You might as well spend the money now and not have to worry about fueling, new lines, re tuning, etc... down the road.
#5
Full Member
Thread Starter
Hey thanks for the replies, im learning towards doing the primary rails aswell although im only really after no more than 400whp.
My next question is am i able to reuse my factory FPR, and do i need to get an aftermarket FPD?
as a side note, my secondarys are EV14 2200cc, is it worth upgrading my primarys to EV14 725cc, or get the EV14 550cc as its same cc as stock?
My next question is am i able to reuse my factory FPR, and do i need to get an aftermarket FPD?
as a side note, my secondarys are EV14 2200cc, is it worth upgrading my primarys to EV14 725cc, or get the EV14 550cc as its same cc as stock?
#6
Life is Beautiful
iTrader: (2)
https://www.rx7club.com/3rd-generation-specific-1993-2002-16/first-impressions-rotary-performance-secondary-fuel-rail-1119103/
^RotaryPerformance.com fuel rail upgrade; very practical for your application & HP goals.
^RotaryPerformance.com fuel rail upgrade; very practical for your application & HP goals.
Last edited by Topolino; 09-09-18 at 08:49 AM.
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#8
Rocket Appliances
iTrader: (11)
Skeese
#9
Sponsor
iTrader: (41)
I have always wondered how those selling the "fuel step up kits" that retained the oem pressure regulator on the stock primaries but upgraded the secondary rails to large aftermarket injectors expected it to function correctly. I can see it being possible but I can only imagine you'd be cutting yourself short given the 38 psi base pressure if it permanently set to run at. Not to mention that you have no data on aftermarket injectors at 38 psi so you'd be shooting in the dark there, which kinda invalidates the point of running a modern ecu and injectors.
Skeese
Skeese
#10
Banned. I got OWNED!!!
Stock primary rail has a pulsation damper. It is intended to smooth out any fluctuations in fuel flow before it enters the rails. Pressure is regulated by the regulator on the end of the secondary rail. I've found no detriments running the stock injectors at higher pressures but aftermarket injectors may not flow their full ratings at less then recommended pressure.
#12
Banned. I got OWNED!!!
#13
Rocket Appliances
iTrader: (11)
Stock primary rail has a pulsation damper. It is intended to smooth out any fluctuations in fuel flow before it enters the rails. Pressure is regulated by the regulator on the end of the secondary rail. I've found no detriments running the stock injectors at higher pressures but aftermarket injectors may not flow their full ratings at less then recommended pressure.
Skeese
The following users liked this post:
WANKfactor (09-13-18)
#15
Banned. I got OWNED!!!
8v, 10v, 12v, 13v, 14v, 15v, 16v
x
38psi, 43.5psi, 45psi, 50psi, 55psi, 60psi, 65psi, 70psi, 75psi, 80psi, etc
#16
Time or Money, Pick one
iTrader: (36)
I had my nearly new(3k miles) ID1000cc injectors cleaned and one of them was dripping and the other spray pattern was just fair as well. I expected my older injectors to be like that but not these new ones. In fact my old stock injectors (old build) seemed to have a better spray pattern before cleaning than the ID's according to the spec sheet on their last cleaning.
#17
Banned. I got OWNED!!!
I had my nearly new(3k miles) ID1000cc injectors cleaned and one of them was dripping and the other spray pattern was just fair as well. I expected my older injectors to be like that but not these new ones. In fact my old stock injectors (old build) seemed to have a better spray pattern before cleaning than the ID's according to the spec sheet on their last cleaning.
#18
Built Not Bought
iTrader: (14)
I don't think it matters much. If you can't afford to upgrade stock primaries, you can't afford to tune the car so far to the edge that they are the reason you could experience an engine failure as a result of a marginal voltage variance.
If tuning to the ragged edge, you better have premium parts in all critical areas.
If tuning to the ragged edge, you better have premium parts in all critical areas.
#19
Sponsor
iTrader: (41)
Since you're going beyond the factory spec with them, you should have a deadtime table with the following axis filled out for your customers then, to input into their ECUs.
8v, 10v, 12v, 13v, 14v, 15v, 16v
x
38psi, 43.5psi, 45psi, 50psi, 55psi, 60psi, 65psi, 70psi, 75psi, 80psi, etc
8v, 10v, 12v, 13v, 14v, 15v, 16v
x
38psi, 43.5psi, 45psi, 50psi, 55psi, 60psi, 65psi, 70psi, 75psi, 80psi, etc
#20
Time or Money, Pick one
iTrader: (36)
Anyone else notice this problem of these injectors clogging? My fuel pump is new also and when I swapped it I inspected the tank and it was clean inside.
What filter are others using with these injectors? Thanks
#21
Rocket Appliances
iTrader: (11)
im running a new one style filter, less than 3k miles as well.
Anyone else notice this problem of these injectors clogging? My fuel pump is new also and when I swapped it I inspected the tank and it was clean inside.
What filter are others using with these injectors? Thanks
Skeese
Last edited by Skeese; 09-16-18 at 08:53 PM.
#24
Rotary Enthusiast
iTrader: (5)
I had my nearly new(3k miles) ID1000cc injectors cleaned and one of them was dripping and the other spray pattern was just fair as well. I expected my older injectors to be like that but not these new ones. In fact my old stock injectors (old build) seemed to have a better spray pattern before cleaning than the ID's according to the spec sheet on their last cleaning.