# Dual Fuel Rail!
**URL:** https://forums.speedlife.net/t/dual-fuel-rail/183926
**Category:** PittSpeed Automotive
**Created:** [July 31, 2006, 9:39am UTC](https://forums.speedlife.net/t/dual-fuel-rail/183926 "2006-07-31T09:39:35Z")
**Posts on this page:** 20
**Page:** 1
### Author:  [@yamaha](https://forums.speedlife.net/u/yamaha)
#### Post date: [July 31, 2006, 9:39am UTC](https://forums.speedlife.net/t/dual-fuel-rail/183926/1 "2006-07-31T09:39:35Z")
The dual rail kit is a great way to tune with a SMT or some other piggyback. The dual rail is basically a second fuel rail built in after the stock fuel rail. It is controlled by a SMT6, in my case, and will be good for adding fuel, and the ECU cannot lean out anything.
The stock rail will be put back in place, along with the stock FPR and return line. The second fuel rail is sliced in to the fuel feed and fuel return line. The injectors are hooked up to a MAP sensor and the SMT, and tuning is done from there. Here are a few shots from the prototype and another members car on RD:
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### Author:  [@fmfkid250](https://forums.speedlife.net/u/fmfkid250)
#### Post date: [July 31, 2006, 3:39pm UTC](https://forums.speedlife.net/t/dual-fuel-rail/183926/2 "2006-07-31T15:39:16Z")
hmm interesting, why?
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### Author:  [@vw16vcabby](https://forums.speedlife.net/u/vw16vcabby)
#### Post date: [July 31, 2006, 3:52pm UTC](https://forums.speedlife.net/t/dual-fuel-rail/183926/3 "2006-07-31T15:52:38Z")
my guess is it lets him piggy back off stock ecu. off boost and low boost, car runs on normal maps. on boost, the extra injecors kick in.
same thing as an sds eic. only thing is, how are you controlling ignition.
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### Author:  [@bgblockelcamino](https://forums.speedlife.net/u/bgblockelcamino)
#### Post date: [July 31, 2006, 3:57pm UTC](https://forums.speedlife.net/t/dual-fuel-rail/183926/4 "2006-07-31T15:57:41Z")
neat
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### Author:  [@yamaha](https://forums.speedlife.net/u/yamaha)
#### Post date: [July 31, 2006, 5:13pm UTC](https://forums.speedlife.net/t/dual-fuel-rail/183926/5 "2006-07-31T17:13:52Z")
> [@vw16vcabby](#):
>
> my guess is it lets him piggy back off stock ecu. off boost and low boost, car runs on normal maps. on boost, the extra injecors kick in.
>
> same thing as an sds eic. only thing is, how are you controlling ignition.
SMT6 will be hooked up to the secondary fuel rail, as well as the ECU to control timing, watch engine temperatures, and read narrowband off the first O2 sensor.
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### Author:  [@imported\_gearhead](https://forums.speedlife.net/u/imported_gearhead)
#### Post date: [July 31, 2006, 5:22pm UTC](https://forums.speedlife.net/t/dual-fuel-rail/183926/6 "2006-07-31T17:22:42Z")
thats just stupid. Unless that car makes 2000hp, its ghey
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### Author:  [@yamaha](https://forums.speedlife.net/u/yamaha)
#### Post date: [July 31, 2006, 6:22pm UTC](https://forums.speedlife.net/t/dual-fuel-rail/183926/7 "2006-07-31T18:22:27Z")
No, since I have MAF on my car and I am running larger injectors then stock, the ECU will lean out any settings entered in via a fuel tuning hardware. The secondary fuel rail runs the larger injectors while the primary fuel rail runs the stockers. This allows me to add as much fuel as I want to, and the ECU will be happy doing its own thing.
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### Author:  [@FourGee6Tee3](https://forums.speedlife.net/u/FourGee6Tee3)
#### Post date: [July 31, 2006, 8:00pm UTC](https://forums.speedlife.net/t/dual-fuel-rail/183926/8 "2006-07-31T20:00:53Z")
> [@gearhead](#):
>
> thats just stupid. Unless that car makes 2000hp, its ghey
Amen. I have a MAF as well I sure don’t need 8 injectors.
Its called an SAFC (i’m going to guess its less of a headache then trying to tune with two different sets of injectors). Allthough i do like the extension between the head and manifold, for a little more turbulence.
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### Author:  [@Quik](https://forums.speedlife.net/u/Quik)
#### Post date: [July 31, 2006, 8:04pm UTC](https://forums.speedlife.net/t/dual-fuel-rail/183926/9 "2006-07-31T20:04:26Z")
i know of another 4 banger that has 8 injectors. after a certain rpm the second set kicks in and adds the addtional fuel
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### Author:  [@FourGee6Tee3](https://forums.speedlife.net/u/FourGee6Tee3)
#### Post date: [July 31, 2006, 8:16pm UTC](https://forums.speedlife.net/t/dual-fuel-rail/183926/10 "2006-07-31T20:16:12Z")
I know one with 10 and it runs 7’s
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### Author:  [@yamaha](https://forums.speedlife.net/u/yamaha)
#### Post date: [August 1, 2006, 4:18am UTC](https://forums.speedlife.net/t/dual-fuel-rail/183926/11 "2006-08-01T04:18:48Z")
How is it gay? Since its a friggin Hyundai and there is no company out there yet to crack the ECU, its the simplist way around the ECU leaning out everything.
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### Author:  [@FourGee6Tee3](https://forums.speedlife.net/u/FourGee6Tee3)
#### Post date: [August 1, 2006, 5:51am UTC](https://forums.speedlife.net/t/dual-fuel-rail/183926/12 "2006-08-01T05:51:33Z")
hyundai uses a 4g63 template and pretty much an identical Mitsubishi ecm design.
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### Author:  [@imported\_gearhead](https://forums.speedlife.net/u/imported_gearhead)
#### Post date: [August 1, 2006, 6:21am UTC](https://forums.speedlife.net/t/dual-fuel-rail/183926/13 "2006-08-01T06:21:54Z")
> [@FourGee6Tee3](#):
>
> hyundai uses a 4g63 template and pretty much an identical Mitsubishi ecm design.
true story
more smarts would have told the person that 8 injectors is :mrT:
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### Author:  [@yamaha](https://forums.speedlife.net/u/yamaha)
#### Post date: [August 1, 2006, 6:36am UTC](https://forums.speedlife.net/t/dual-fuel-rail/183926/14 "2006-08-01T06:36:02Z")
> [@FourGee6Tee3](#):
>
> hyundai uses a 4g63 template and pretty much an identical Mitsubishi ecm design.
The ECU from the 4G63 and the BetaI motor are completely different.
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### Author:  [@SP71Supra](https://forums.speedlife.net/u/SP71Supra)
#### Post date: [August 1, 2006, 6:50am UTC](https://forums.speedlife.net/t/dual-fuel-rail/183926/15 "2006-08-01T06:50:54Z")
There is a guy with a similar setup with a Supra… but its definatly different. He has 2 rails, 12 injectors. 6 primary injectors are 1000cc injectors running 94 octane for driving around easy, when he gives it over 85% throttle, it shuts off the primarys and opens the 1600cc secondarys with a seperate fuel cell in the trunk filled with VP Import. So he never ever has to change gas to race… this is with the AEM EMS by the way. Nice setup to get 20mpg, then 1500rwhp without draining the fuel out of the car.
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### Author:  [@yamaha](https://forums.speedlife.net/u/yamaha)
#### Post date: [August 17, 2006, 5:22pm UTC](https://forums.speedlife.net/t/dual-fuel-rail/183926/16 "2006-08-17T17:22:54Z")
Dual rail kit came in today, pictures:
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### Author:  [@Pewter](https://forums.speedlife.net/u/Pewter)
#### Post date: [August 18, 2006, 4:13am UTC](https://forums.speedlife.net/t/dual-fuel-rail/183926/17 "2006-08-18T04:13:44Z")
very nice,got any other pics?:naughty:
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### Author:  [@STAGE](https://forums.speedlife.net/u/STAGE)
#### Post date: [August 18, 2006, 4:30am UTC](https://forums.speedlife.net/t/dual-fuel-rail/183926/18 "2006-08-18T04:30:18Z")
Hahn Racecraft has something like that. It’s called a portfueler. Uses secondary injectors for when the car gets deep into boost to a point where the primaries can’t supply enuff fuel.
[http://www.modernperformance.com/dcx/srt\_hrc\_portfueler.shtml](http://www.modernperformance.com/dcx/srt_hrc_portfueler.shtml)
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### Author:  [@yamaha](https://forums.speedlife.net/u/yamaha)
#### Post date: [August 18, 2006, 5:11am UTC](https://forums.speedlife.net/t/dual-fuel-rail/183926/19 "2006-08-18T05:11:41Z")
SMT-6 with a dual rail tuned to kick in for boost has been shown to eliminate the ECU leaning out the tune and you can supposidly adjust timing with the SMT-6. BUT no the great thing about running dual rail is that you get to keep your stock rail with the ECU tuning the trim by itself when off boost or say under a certain % throttle or at a certain RPM, meaning you get to keep your low speed tune and DD and idle arent affected. if you were to go single rail with larger injectors you would have to tune on low rpms so that your not getting too much fuel at idle/cruise.
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### Author:  [@bgblockelcamino](https://forums.speedlife.net/u/bgblockelcamino)
#### Post date: [August 18, 2006, 5:14am UTC](https://forums.speedlife.net/t/dual-fuel-rail/183926/20 "2006-08-18T05:14:36Z")
very neat
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