E85

hooey_b

E85 requires ~30% more flow capabilities than normal gas; my question is when would you want to install a fuel return? is that based on fuel demand @ WOT or is it based on the size of your fuel pump/injectors?

any details/answers are appreciated

Thanks!

DOOMMONKEY777

fuel pump, injectors, need 30% more flow, and a fuel return is required by DOT? anyhow on N/A engine, its useless unless u change compression ratio, on TT or SC u can reach over 100HP over 91-93. Phunk i think made like 675WHP stock engine on e85, gl OP.

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TerribleONE

Not worth the investment if your staying NA IMO

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hooey_b

i'm NOT staying NA. just hitting the NA ceiling before i get boost, enjoying the parts along the way instead of doing it all at once.

Chuck33079

That's going to be a lot of wasted money. You won't be keeping many of the parts you use to hit the NA ceiling when you boost the car.

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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

mag_black

Just to clarify; the investment in a fuel return system is not worth it or going E85 while being NA isn't worth it?

I planned on making the switch to E85 before going boost myself.

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Chuck33079

A fuel return for anything but a turbo setup is overkill. You don't even need it for a more conservative turbo setup.

If injectors, pump and a tune are worth it for the ~10whp you'll get NA on e85, go for it. But the injectors you need for a NA E85 setup are much smaller than for a turbo build, so you'll end up replacing them again when you boost the car.

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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

hooey_b

I'm building for 700ish hp. Here's my roughplan:


-63mm throttle bodies
-Ported upper intake plenum
-Ported lower intake plenum
-600+CC fuel injectors (E85 compatible) for now, 1k or larger later
-320/325 LPH fuel pump
-Fuel pressure regulator
-Fuel return kit
-distributor plugs
-Front upper adjustable control arms
-Rear camber arms
-Rear toe bolts
-Rear traction bolts
-GT strut bar
-Sway bars
-Oil catch can 200cc+
-Lightweight flywheel
-Stage III clutch
-Slotted brake discs
-Stainless steel brake lines
- Stainless steel clutch lines
-Silicone coolant hoses
-CSF radiator
-19 row oil cooler system (larger if/when needed)
-1/2" oil pan spacer/enlarged oil pan/w/spacer
-Enlarged rear diff pan
-Final drive 3.9 gear
-Polyurethane Differential bushings
-Polyurethane transmission mount
-Polyurethane engine mounts
-midpipe section strait pipe exhaust
-Headers
-Ecutek tuning

BOOST

-carrillo a type h arms
-CP 11.1:1 piston head w/ gaskets
-ARP studs
-ARP extended wheel bolts
-JWT 263 cams w/ supporting valve springs/retainers
-Vortex single or F.I. Twin turbo

-FINAL TUNE, E85, 93, 91, maybe 100


When I ask questions, keep in mind that I'm not looking for power NOW. I was reliable power, and I want a proper build, no shortcuts. I'm just seeing if I can knock it out now rather than later since I'm going E85 and porting everything up to the heads.

hooey_b

There are some parts that are redundant (I.e. Headers, injectors...to change/be removed/replaced as power increases.

Chuck33079

Fair enough, I just dont know why you would waste the money on parts and labor that you will not need when you boost the car.

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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

theDreamer

This, some of the parts you have are nice when N/A but will need to be replaced as it will make boost terrible such as the gears or the oil cooler/plugs, waste of money to buy now and then know you will change when going boost.

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TerribleONE

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hooey_b

I just think it's my nature as a person. I was a nuclear reactor in the military, so attention to detail and overkill with precautions (getting more than i need so i don't have to worry about it) is kinda my thing.

That, and for some reason, 90% of the ppl i meet who talks cars have all taken the fast route for power (kit + car + wanting to drive it like it was meant for that hp= f@*#ed.) or just want to make it pretty w/ a few suspension mods/bolt ons.

The way I see it, it's like a torque wrench. when using it, you want to ideally load whatever value you're torquing to within 15%-90% of the max range of the wrench, to make sure that you're accurate and that you're not putting undue stress by pushing it to its full capabilities.

Chuck33079

I understand you overbuilding the motor, but headers, injectors, gears and the oil cooler will do nothing as far as what you're trying to do. It'll just be money spent on parts and labor that you'll turn around and resell for 50 cents on the dollar (and a total loss on the labor) when you put the turbo on. Skip the headers and gears, buy the 34 row oil cooler the first time, and between parts and labor you're $2000 closer to the built motor and turbo. If you have to do the injectors and E85 now, go with the larger injectors off the bat. They're harder to tune for, but it'll save you the $600 for the smaller injectors that won't work when you put on the turbo kit.

Skipping the clutch and flywheel for now (you do have a CSC replacement on the list, right?) and holding off until the motor comes out will save you 5-9 hours of labor and the pain in the *** of driving a FI rated clutch in traffic every day. The adjustable clutch pedal will be your friend at that point too.

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2011 MB Touring-Sport-6sp-Nav/GTM TT/FI TT TDX/JTran/Kosmic/Eibach/Hotchkis/SPC/CSF/RPS/SoThatsWhereAllMyMoneyWent

Elmo370z

your money do what you want. Talk to an engine builder to get a clear answer.