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View Full Version : Mods required to run an E85 tune



fishawrx
02-21-2012, 05:50 PM
Trying to figure out if my current mod list will be sufficient to run an E85 tune. I'm thinking the only shortcoming might be the injectors, as I don't want to max out my injector duty cycles. Let me know what you think....

Current engine mods:
Blouch TDO5H 16g
Walbro 255lph
820cc witchhunter modded injectors
bigger TMIC
mishimoto silicone intercooler hoses
silicone inlet
tgv deletes
GM BCS
AP fuel rails, lines and distribution block
SPT short ram intake
snorkus chop
catless uppipe
HKS downpipe catless
HKS hi-power catback

Justin 05 Sti
02-21-2012, 05:51 PM
What is your duty cycle now?

fishawrx
02-21-2012, 06:32 PM
Looks like 66.7% IDC at 100% throttle, 7000 RPM in 3rd gear is the highest IDC on the last WOT logs that I took. They all look like steadily increasing IDCs under WOT going through a 3rd gear pull.

316legacygt
02-21-2012, 10:53 PM
It would be close. You could get a fpr and turn the fuel pressure up a bit to lower your idc. I think you would be around 95-100% without the fpr.

VF34RX
02-23-2012, 04:54 PM
I would suggest you get the ID1000's and rail combo that MKC was selling. If they still have it. That will give you plenty of head room should you go bigger. I would also suggest a turbo inlet and afta-maf hose.

Who are you planning to have tune it?

fishawrx
02-23-2012, 09:03 PM
I was thinking MKC but never got a response when I emailed them to see if my current setup is sufficient. I'm not looking to add anything more. If it requires much more investment beyond the tune at this point, I will probably hold off for the time being.

VF34RX
02-24-2012, 10:56 AM
I was thinking MKC but never got a response when I emailed them to see if my current setup is sufficient. I'm not looking to add anything more. If it requires much more investment beyond the tune at this point, I will probably hold off for the time being.

You have to call or just go there.

CZ03WRX
02-24-2012, 11:13 AM
I would suggest you get the ID1000's and rail combo that MKC was selling. If they still have it. That will give you plenty of head room should you go bigger. I would also suggest a turbo inlet and afta-maf hose.

Who are you planning to have tune it?

Every bit of research I've done says that rails are a complete waste of money. Something about them not actually being properly scaled and the fluid dynamics being incorrect. They just dump fuel and that's it.

VF34RX
02-24-2012, 12:43 PM
Every bit of research I've done says that rails are a complete waste of money. Something about them not actually being properly scaled and the fluid dynamics being incorrect. They just dump fuel and that's it.

Interesting. Never ran across this info.

CZ03WRX
02-24-2012, 01:01 PM
I'll see if I can dig it back up. It was all on NASIOC so I suppose take it with a grain of salt. Basically the amount of money that it would actually cost to purchase the equipment to properly test a fuel rail isn't feasable for any of the companies that sell them. Yes they flow more fuel, and yes they flow what they say. The issue lies in the lack of design/r&d. They simply make a fancy looking thing with no restrictions that dumps a shitload of fuel.

CZ03WRX
02-24-2012, 01:08 PM
fyi


Fuel Rail FAQ

What are fuel rails? Aftermarket fuel rails are designed to increase the internal diameter of the stock fuel lines as well as convert the OEM fuel rail set up from series to parallel. The theory behind these two changes is to increase fuel flow and equalize fuel distribution.

When are fuel rails needed? This is a very hard question without a clear answer. Two very reputable tuners and NASIOC Vendors do not believe they are necessary. god of Godspeed Inc. and nmyeti of TurboXS recently posted that they are not needed for additional fueling or fuel distribution equalization, which is the rumored cause of particular cylinder number failures. Another view by nmyeti. That being said, there is no real downside to fuel rails for people who believe they may provide an extra level of protection.


Source 1 (http://forums.nasioc.com/forums/showthread.php?s=&postid=6255419#post6255419)

2 (http://forums.nasioc.com/forums/showthread.php?s=&postid=6262318#post6262318)

and 3 (http://forums.nasioc.com/forums/showthread.php?s=&postid=4232505#post4232505)

tehspettro
02-24-2012, 02:28 PM
SS bradied fuel lines

VF34RX
02-24-2012, 02:48 PM
fyi


Source 1 (http://forums.nasioc.com/forums/showthread.php?s=&postid=6255419#post6255419)

2 (http://forums.nasioc.com/forums/showthread.php?s=&postid=6262318#post6262318)

and 3 (http://forums.nasioc.com/forums/showthread.php?s=&postid=4232505#post4232505)

Good find. This needs to be spread out more often.

CZ03WRX
02-24-2012, 04:02 PM
Good find. This needs to be spread out more often.

I like to share what I find. I keep kicking around a major build so I've been researching this stuff alot.

scooby_rex
02-24-2012, 08:43 PM
I would say that fuel equalization seems like a pretty big benefit. If you have the raw fuel syndrome of bugeyes, why not get that fuel equalization?

fishawrx
02-24-2012, 10:07 PM
I believe the issue with the OE fuel lines is that they are not parallel. On the OE system, the fuel enters in on the drivers side and continues on to the passenger side after first feeding the driver's side cylinders. By the time it gets to the last cylinder on the passenger side, it is said that the last cylinder can actually run lean. aftermarket fuel rails are parallel. The AP fuel rails that I have each have an SS braided individual feed line from a distribution block. I won't need any higher flowing fuel rails in the foreseeable future.

There's also the issue of the OE fuel rail/lines leaking fuel in cold temperatures. My car had this issue, so I replaced my fuel rails. A few years later, they finally initiated a recall.

fishawrx
02-26-2012, 02:54 PM
I talked to Chad at MKC. He said the 820cc injectors will be fine but he typically uses 1000s.

WRXNFX
02-26-2012, 06:37 PM
So a stock STi can go corn juice?

fishawrx
02-26-2012, 07:46 PM
I assume any engine can go corn juice if the tune is correct? Of course, without the fuel system to support it, there's not much of a point. Chad said my setup will do for an E85 tune. Are you implying a stock STI has 820cc injectors?