efr8374 fuel system
#1
efr8374 fuel system
Need a little help tweaking my fuel system. Turblown IWG short runner 8374 setup, Power FC, newly rebuilt stockport FD with an ok/mediocre tune. Currently running 850 primaries 1600/1680 whatever Ford/Bosch injectors, supra pump. It runs ok, but I'm not satisfied for two main reasons, I don't trust the resistors, and I don't like the big old school 850 primaries. I'm not made of money. Give me some cost effective options. I'm leaning towards going back to 550 primaries, dropping some ID1700s in the KG seconday rail. This should improve driveability/tuneability a ton, no?
#2
Life is Beautiful
iTrader: (2)
https://www.rx7club.com/3rd-generation-specific-1993-2002-16/first-impressions-rotary-performance-secondary-fuel-rail-1119103/page2/
RP fuel rail @ 550 stock primaries + 2200 secondaries
^...reliable & cost-effective setup for a tad over 500HP capability
RP fuel rail @ 550 stock primaries + 2200 secondaries
^...reliable & cost-effective setup for a tad over 500HP capability
Last edited by Topolino; 12-16-18 at 07:56 PM.
#4
https://www.rx7club.com/showthread.php?t=1119103&page=2
RP fuel rail @ 550 stock primaries + 2200 secondaries
^...reliable & cost-effective setup for a tad over 500HP capability
RP fuel rail @ 550 stock primaries + 2200 secondaries
^...reliable & cost-effective setup for a tad over 500HP capability
Last edited by aplscrambles; 12-16-18 at 08:04 PM.
#5
I noticed that. What gives? 2000s cheaper than 1700s? I have access to a good tune for 550/1600s, with an 8374. My thought process was if I went to the 550/1700s, that tune could get me by till I get a better tune, as Im not too handy with a datalogit. I tried and failed, lol.
#6
Banned. I got OWNED!!!
There are threads on this once every two weeks. Simply just go search on this forum... it's covered thoroughly.
Personally, I'd say save for a better ECU like a Haltech Elite and run the injectors you have. Control starts at the SOURCE, just like with audiophile grade music. You can have a set of Focal Utopias and use some crap 128kbps streaming service pumped into them and guess what, they'll still sound like ****.
Bosch EV14 850cc Primaries are cheap to buy and the ID1700x's are awesome (I'm selling mine, new in box, if the 2550x come out in a reasonable timeframe). Anything over 400whp and I'd suggest another fuel pump (staged using a relay/hobbs switch at least).
Shoot me a PM if you really feel lost, but I promise you this is handled thoroughly on here.
Personally, I'd say save for a better ECU like a Haltech Elite and run the injectors you have. Control starts at the SOURCE, just like with audiophile grade music. You can have a set of Focal Utopias and use some crap 128kbps streaming service pumped into them and guess what, they'll still sound like ****.
Bosch EV14 850cc Primaries are cheap to buy and the ID1700x's are awesome (I'm selling mine, new in box, if the 2550x come out in a reasonable timeframe). Anything over 400whp and I'd suggest another fuel pump (staged using a relay/hobbs switch at least).
Shoot me a PM if you really feel lost, but I promise you this is handled thoroughly on here.
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#9
B O R I C U A
iTrader: (14)
There are threads on this once every two weeks. Simply just go search on this forum... it's covered thoroughly.
Personally, I'd say save for a better ECU like a Haltech Elite and run the injectors you have. Control starts at the SOURCE, just like with audiophile grade music. You can have a set of Focal Utopias and use some crap 128kbps streaming service pumped into them and guess what, they'll still sound like ****.
Bosch EV14 850cc Primaries are cheap to buy and the ID1700x's are awesome (I'm selling mine, new in box, if the 2550x come out in a reasonable timeframe). Anything over 400whp and I'd suggest another fuel pump (staged using a relay/hobbs switch at least).
Shoot me a PM if you really feel lost, but I promise you this is handled thoroughly on here.
Personally, I'd say save for a better ECU like a Haltech Elite and run the injectors you have. Control starts at the SOURCE, just like with audiophile grade music. You can have a set of Focal Utopias and use some crap 128kbps streaming service pumped into them and guess what, they'll still sound like ****.
Bosch EV14 850cc Primaries are cheap to buy and the ID1700x's are awesome (I'm selling mine, new in box, if the 2550x come out in a reasonable timeframe). Anything over 400whp and I'd suggest another fuel pump (staged using a relay/hobbs switch at least).
Shoot me a PM if you really feel lost, but I promise you this is handled thoroughly on here.
#10
Senior Member
iTrader: (2)
Fairly large Steetport. Running id 850 pri and 2k sec. at 14-15 psi was looking at the fuel pressure in the logs. Wasn't holding and was constantly going up and down. Normal driving was fine but get on it that's when i saw the issues. Swapped pumps and it's fine. This was a year ago. I have read varying things on the surpa pump. I wouldn't trust it past 400 unless you can overvolt it. i think it is fine for the stock twins and 99 twins but get a good single turbo and you just need a better pump. I had 99 twins and was happy with it when i did my full rebuild. But since then i swapped to the 8374.
#11
Fairly large Steetport. Running id 850 pri and 2k sec. at 14-15 psi was looking at the fuel pressure in the logs. Wasn't holding and was constantly going up and down. Normal driving was fine but get on it that's when i saw the issues. Swapped pumps and it's fine. This was a year ago. I have read varying things on the surpa pump. I wouldn't trust it past 400 unless you can overvolt it. i think it is fine for the stock twins and 99 twins but get a good single turbo and you just need a better pump. I had 99 twins and was happy with it when i did my full rebuild. But since then i swapped to the 8374.
#13
Senior Member
iTrader: (2)
I went with what Hc post above in the stickies to get my max fuel for the turbo. Even thou I won't be pushing that much power on it. So my ID 850's and ID2k's net me around 6kcc of fuel. I'm running the walbro 465lph pump. https://walbrofuelpumps.com/walbro-f...-fuel-pump-e85.
Here's why I'm glad i did. My cat got clogged and i got a resonated mid-pipe. So I had a straight threw 3in exhaust. Now be for this happened i was rock solid at 14-15 psi. Once that mid-pipe when in I could not control my boost. I was hitting 20+ lbs and couldn't go full throttle. But if i didn't have the fuel set up i would be rebuilding right now. I'm honestly thinking about getting the id1050x for pri.
Here's why I'm glad i did. My cat got clogged and i got a resonated mid-pipe. So I had a straight threw 3in exhaust. Now be for this happened i was rock solid at 14-15 psi. Once that mid-pipe when in I could not control my boost. I was hitting 20+ lbs and couldn't go full throttle. But if i didn't have the fuel set up i would be rebuilding right now. I'm honestly thinking about getting the id1050x for pri.
#16
Rotary Enthusiast
iTrader: (8)
Controlling the stock 850s in the primary position with a PFC has always been finicky but it's doable though not worth the effort in my opinion. I like my id1050x's as my primaries and depending on the ECU I've been able to control id1750x's well enough to pass smog as well.
#17
Banned. I got OWNED!!!
You can idle on ID2000s just fine, so that whole drivability issue is bullshit. That's why you pay for a quality injector that's characterized. The ID2000s can do something like 15uL per injection at their smallest controlled (consistent) measurement, and the rotary engine in stock porting needs almost twice that to attain a stoichiometric AFR.
Walbro 450lph is great until you have any decent boost pressure. Fuel pressure calculations are simple, so let's run through them to really identify what your system NEEDS. Go bigger here, because always being over 80-85% Duty Cycle is a recipe for failures.
Fuel Pressure to identify which pump you need is going to be your peak boost pressure + engine off, pump on pressure + losses in the lines/system. So for instance if you plan on running 43.5psi (3 Bar) base pressure and 15psi boost pressure on your turbo, we can estimate at least 5psi drop on the fuel system in the lines and filters. So that ends up being that the pump is working at 43.5 + 15 + 5 = 63.5psi. Given the picture below, the best case scenario, that pump is running around 360lph at 13.5v using a F90000267 Walbro 450lph pump. The Supra pump is FAR less than this at 230lph at 14v.
So enough with the fake news bullshit. Run the math, realize that fuel evaporates if it's cycled through abundantly and not properly controlled, and you sure as **** need a fuel damper such as the Radium Engineering XR on your aftermarket fuel rails to help with the large injection opening since we have half the injection time (and therefore need twice the fuel) of a reciprocating engine.
The Bosch EV14 stuff is fine. Minimum 850cc Primaries, 1700cc Secondaries. I'd suggest ID1050x Primaries and ID1700x Secondaries for Pump Gas. If you plan on going e85, you're in for a hell of a lot larger configuration.
Walbro 450lph is great until you have any decent boost pressure. Fuel pressure calculations are simple, so let's run through them to really identify what your system NEEDS. Go bigger here, because always being over 80-85% Duty Cycle is a recipe for failures.
Fuel Pressure to identify which pump you need is going to be your peak boost pressure + engine off, pump on pressure + losses in the lines/system. So for instance if you plan on running 43.5psi (3 Bar) base pressure and 15psi boost pressure on your turbo, we can estimate at least 5psi drop on the fuel system in the lines and filters. So that ends up being that the pump is working at 43.5 + 15 + 5 = 63.5psi. Given the picture below, the best case scenario, that pump is running around 360lph at 13.5v using a F90000267 Walbro 450lph pump. The Supra pump is FAR less than this at 230lph at 14v.
So enough with the fake news bullshit. Run the math, realize that fuel evaporates if it's cycled through abundantly and not properly controlled, and you sure as **** need a fuel damper such as the Radium Engineering XR on your aftermarket fuel rails to help with the large injection opening since we have half the injection time (and therefore need twice the fuel) of a reciprocating engine.
The Bosch EV14 stuff is fine. Minimum 850cc Primaries, 1700cc Secondaries. I'd suggest ID1050x Primaries and ID1700x Secondaries for Pump Gas. If you plan on going e85, you're in for a hell of a lot larger configuration.
#18
Sponsor
iTrader: (41)
Everything you need here https://www.irperformance.com/produc...n-fuel-system/
I can tayor the fuel system with various injector sizes to suit your needs but 750/2000 covers most setups. Alternately I can do a stepup kit to keep your primaries and add a secondary rail, injectors, and regulator for about half that price.
I can tayor the fuel system with various injector sizes to suit your needs but 750/2000 covers most setups. Alternately I can do a stepup kit to keep your primaries and add a secondary rail, injectors, and regulator for about half that price.
#19
Everything you need here https://www.irperformance.com/produc...n-fuel-system/
I can tayor the fuel system with various injector sizes to suit your needs but 750/2000 covers most setups. Alternately I can do a stepup kit to keep your primaries and add a secondary rail, injectors, and regulator for about half that price.
I can tayor the fuel system with various injector sizes to suit your needs but 750/2000 covers most setups. Alternately I can do a stepup kit to keep your primaries and add a secondary rail, injectors, and regulator for about half that price.
#21
Rotary Enthusiast
iTrader: (8)
I wouldn't want to try with a PFC but I have with an M600 on a big street port 3 rotor. I've also idled ( barely, and at 1350) a RacingBeat periph 20b using ITBs. :shrug: the ID injectors are nice.
*to clarify, with the 2000s I didn't even try to sniff as these were both race engines*
#24
Banned. I got OWNED!!!