Laz93RX7

iTrader: (5)

sorry if it sounds noobish. searched, didnt get anything real solid. I know everyone has their own opinions & setups and I want to hear them. please
what do I need to do to use corn juice.

thanks

I have
750cc primary
1600 cc secondary
custom fuel rails
weldon 600 fuel pump
aeromotive fpr
stainless -8 lines
microtech lt-10s

rex3

iTrader: (2)

Swap out those primarys 1600's retune you should be good to go.

cr7684

iTrader: (42)

Keep in mind you will need to retune. With that said you can run E85 now if you have a SS mesh fuel fitter. The thing about E85 is you will need 30% more Vol to make the same power as 93. That's the reason for bigger injectors and maybe another fuel pump.

Laz93RX7

iTrader: (5)

I know I would have to retune & I do have stainless filters but i'm reading guys putting 2200cc for primarys. I was thinking that with 1600cc all around would be enough. so I should be ok if I swap out my 750s for 1600s. what about fuel pressure do I have to play with that? or does that stay at 40

moremazda

iTrader: (4)

You should consider changing all four. 1000cc primary and 2200cc secondary. I used 1600 primaries on my car (with e-85) and the injector time was always in the crappy flow range of the injector. The idle quality was never that good, and was always too rich.

Use these injectors.
http://injectordynamics.com/

Laz93RX7

iTrader: (5)

cant wait to try corn juice lucky for me I have an e85 station 6 mins away

cr7684

iTrader: (42)

I see no need for 1600cc as primaries where there is no engine load! I say +1 on running 2200cc secondary or run 6 injectors.

ronbros3

who sells 2200cc low impedence injectors, denso style?

cr7684

iTrader: (42)

Siemens

turbo10th

iTrader: (6)

Where did you get the stainless filters? Thinking about doing this myself and the lines are all stock in my car, so guessing i need to swap the steel lines out for stainless. Will the rubber be ok? And what are you coating the fuel rails with?

Laz93RX7

iTrader: (5)

some sad news I just found out that my weldon 600a pump isnt compatible with e85, I know the aeromotive a1000 pump is good for e85 (too loud) but I want to know what other pumps that are compatible with e85 that are proven.

moremazda

iTrader: (4)

The Bosch 044's have proven to work very well with alcohols

cr7684

iTrader: (42)

Aeromotive fuel filters use the 100 micron here is a link http://cgi.ebay.com/ebaymotors/Aerom...item4ced58ed11 just to give you a starting point and I'm not using any coating on my fuel rails!

cr7684

iTrader: (42)

+1 if your looking for BIG numbers run two of them! moremazda you know your **** on E85!

stripling

i'm running:

*efini twins modified vacuum system syncro intact
*straight pipes to catback
*power FC with commander and datalogit
*apexi intake
*no smog (no emissions, go global warming lies!)
*FMIC Greddy 34 row (I know, I know, stupid mistake with efini/stock twins )
*street ported w/3mm
*1600 secondaries and 850cc primaries
*Denso FP

I'm getting 387 HP to the wheels on premium gas at 14 lbs max boost, tuned via mazdatrix in LA

...and my question is this...

*IF* I HAVE IT RE-TUNED with e85 (easy to get in Vegas) THEN:

1) How much LESS POWER will I get assuming my injectors are big enough?
2) With efini twins obviously my injectors are FINE for pump-gas but how much more injector volume on e85?

I always loved rx7.com's calculator but from what I see I'm not getting a compensation for e85

I KNOW e85 setup is ideal for T78/88 700HP crap, but I CAN'T HANDLE THE LAG!

So, here's what I'm thinking, tell me what you think -

stripling

CRAP, sorry, accidentally entered that.... continuing now...

IF I USE e85 with this setup I'll get LESS POWER (35% do to fuel restrictions or about 50 HP less which would take me to 337HP) I'd have a car which would still be a good performer (sacrifice, yes) but with the benefit of 105 octane gas which would help my rotary last forever and ever.

Yes? No? Oil metering pump with mixed gas, seeing if I can make this thing last 200,000 miles or more! possible?

Ok, so that's my first question... 1) would it be worth it or would I miss the power and 2) would it really be as engine-kind as I'm hoping? Oh, and also, is my 35% loss of power along with 10% worse gas mileage accurate expectations?

NEXT QUESTION:

IF I can't handle the loss of power and decide to throw on a 75 SHOT NITROUS system to compensate:

1) Will I kill my engine with efini turbo and nitrous?
2) Will my fuel system be able to keep up if question #1 answer is "you'll be fine, sport!"?

I'm thinking of that being my final solution. But, as cool as RX7.com's fuel calculators are, they don't compensate for e85 or nitrous dang

Help?

nillahcaz

iTrader: (2)

why will you have a loss of power? for peak power you need ~42% more fuel not 30, 27% to 30% is what should be used for the low load map.
BTU per gal of gas 114100
BTU per gal of E85 81800
81800 * 1.4 = 114520
so... you have ever slightly more energy per air fuel charge, plus a higher octane rating giving room for more boost.....

stripling

am i reading this wrong?

you quoted MORE BTU's for gas than e85.... thus, gas is MORE powerful per volume, no?

yeah, the higher octane is awesome, but i'm running efini twins so my boost won't do better than 1 bar. that's why i'm mentioning the nitrous - to make the charge more dense thus compensating for the difference. if i'm reading you right 81800/114100(*100)(-100) is 28.3% LESS powerful for e85 thus you need 28.3% MORE fuel if using e85 to compensate.

with my setup 1600ccx2 and 850ccx2 my potential at 85% duty is 628HP... since i'm running now close to 400 i guess nitrous would easily allow for more with my current rail.

let's see.... 1600x2 plus 850x2 = 4900cc for 628HP @ 85% duty

so 4,900cc - 28% = (1,372cc subtracted for e85) 3,528cc

and according to rx7.com 3.528ccs will give me 452HP

since I'll be getting 28% less with e85 from 380HP I'll be getting about 280HP

A 100 shot will put me back to 380HP and 75 shot 355HP - all which are much less than the potential 452 which my injectors can safely cover.

anywho, that's my math.... wonder what i'm doing wrong. maybe e85 should really be reserved for people trying to hit high boost and really won't protect and engine any more than premium under 1bar of boost.

yeah, i'm probably wasting time with e85 if i don't try and hit big boost numbers - and i won't do that 'cause lag drives me CRAZY... i want boost at 800rpm

look at me, i sound like one of those guys who goes lsx ... which i'd do if i could easily swap back my 13bREW back in with little work. so, since that's not gonna happen, if my logic is correct, i'll just stay premium gas, efini turbos, power fc, down, mid, catback, apex'i intakes, mix gas 1/2 oz/gal, fmic (stupid, i know), oil injectors on full, 3mm w/street port and call that quits.

i'll save the e85 dreams for if i ever go T78 or T88 - then i'll stick my 1300cc's on the primaries and look into another diff & stronger tranny options

who am i kidding, i'll never do that. i hate drag racing...

nillahcaz

iTrader: (2)

Yes gas has more power per volume.
BUT you run more fuel as well, The amount of additional fuel gives you slightly more power than gas.
Nitromethane is even lower per volume at 47595 BTU/gal. but the power potential is HUGE due to the 1.7:1 AFR.
lets switch over to lbs here
50 lbs of air
Gas with an 12.8:1 AFR at ~18,500 BTU/lb. = ~72,300 BTU
E85 with an 7.8:1 AFR at ~12,800 BTU/lb. = ~82,000 BTU
Nitrometh with an 1.7:1 AFR at ~5,000 BTU/lb. = ~147,000 BTU
All alcohol at proper AFR gives more energy than gas, For E85 this is not enough to claim a gain due to it and most power gain given nothing changed but fuel and tune is from drop in intake air temp. It still will not make you lose power unless you run out of injector but then the power is not lost... just not realized.
Don't take this math for more than I'm intending it for, just showing that the amount of energy from fuel on a running engine will not lower power output... thats it and thats all, the numbers change to much to say "well it has X% more power i will make X% more" I'm just clarifying before i start catching crap and start a pointless argument..... again

Laz93RX7

iTrader: (5)

what would be my duty cycle with 2x 850cc and 2x 1600cc @25 psi just want to see what injectors to put I think 1600cc as primarys would be a pain to tune on the bottom.

or how could I figure out what would be best.

rx72c

iTrader: (8)

put in 4 X1700cc injectors and youll be right everywere else

Laz93RX7

iTrader: (5)

wouldnt that be a pain in the *** to tune on the bottom.

cr7684

iTrader: (42)

Or you can leave the 850 & get a set or 2200 here is a site GOOD LOOKING Jorge (jm85rx7).
InjectorDynamics.com

Slammedblk7

iTrader: (7)

My set up, I went with is 2 supra fuel pumps, two -6AN feeds, (4) ID2000 injectors and -8AN Return. Should be enough for 700rwhp for E85 if my math is right.

rx72c

iTrader: (8)

Depends what ecu you are running?


Or even 4X2200cc injectors.