Jump to content
SAU Community

Recommended Posts

To be honest, I never really used flex fuel.

Seems good, in the real world once you're on E85 you don't need 98, as the availability is fine unless you're driving to Mildura etc.

That said, flex isn't very hard. All the ECU needs to know is ethanol % which it turns from 0V to 5V.

Then the ECU takes that input which may be like 2.5V, and applies a certain percentage of a correction map to fuel/timing/boost, relative to the voltage of that input.

That's all there is to it

  • Like 1

To be honest, I never really used flex fuel.

Seems good, in the real world once you're on E85 you don't need 98, as the availability is fine unless you're driving to Mildura etc.

That said, flex isn't very hard. All the ECU needs to know is ethanol % which it turns from 0V to 5V.

Then the ECU takes that input which may be like 2.5V, and applies a certain percentage of a correction map to fuel/timing/boost, relative to the voltage of that input.

That's all there is to it

i regularly drive to brissie.

Then I suggest you get a wideband and flex fuel

Wideband because playing with correction maps is likely going to be needed if you want it perfect. Its quite time intensive and expecting it to be PERFECT from a few hours on a dyno will never be feasible.

There's a lot of "hm, I'm idling at 13.7 AFR when I'd like it to be 14.7 when I am on 72% 98 and 28% E85" goings on

then again, can i justify paying 3k or so to make car flex fuel capable? 800$ for injectors, nistune, 1k +-, sensors and stuff, 1k, scotty intake 300?

i'll still run stock turbo.

Running E85 on stock turbo is really not a cost effective/convienient solution

Technically speaking, all E85 does is removes limitations of less than optimal systems, its not like you're gonna slam 30PSI into a stock turbo with a ton of timing for other explodey reasons...

If you could hit MBT and Peak compressor efficiency from your turbo on 98 without it pinging to death, switching to E85 wouldn't give you more power, I've been told that's why some people see big gains from E85 and some people don't

There's still gains to be made from advancing the timing and taking advantage of 107 octane.

Boost will also come on sooner.

But I think if you're spending that much on upgrades you should at the least get an $800 high flow and get another 60-70rwkw out of it while you're there, sacrifice a bit of response given the factory turbo is responsive and linear enough let alone with E85.

Technically speaking though, advancing timing only increases power to a point, after a point it starts reducing power.

If you're not pinging at that point, on 98 well, you don't need E85. It's possible in some lovely systems to not be pinging at MBT.

Same thing re: Boost pressure.

But in the real world, where we do stuff like add turbos to systems designed for lesser turbos, well, E85 starts becoming cool.

Would be curious to see what happens on a stock system, but you aren't gonna run more than 10psi on it anyway.

I would wager youd gain more powars per dollar by upgrading to a hiflow on 98, vs converting to E85 on a stock turbo.

Running E85 on stock turbo is really not a cost effective/convienient solution

Technically speaking, all E85 does is removes limitations of less than optimal systems, its not like you're gonna slam 30PSI into a stock turbo with a ton of timing for other explodey reasons...

If you could hit MBT and Peak compressor efficiency from your turbo on 98 without it pinging to death, switching to E85 wouldn't give you more power, I've been told that's why some people see big gains from E85 and some people don't

There's still gains to be made from advancing the timing and taking advantage of 107 octane.

Boost will also come on sooner.

But I think if you're spending that much on upgrades you should at the least get an $800 high flow and get another 60-70rwkw out of it while you're there, sacrifice a bit of response given the factory turbo is responsive and linear enough let alone with E85.

so. 4k? LOL.

I'm planning on moving to the country, so there will be winton days on 98 and any tracks in city E85

saves me having to do a run down to MELB with jerry cans to do a tampered day.

Planning on going north?

Guest
This topic is now closed to further replies.



  • Similar Content

  • Latest Posts

    • Have a vb in honour of the car comming back
    • It was a great, but typical track day, and some VB was ingested at the night time debrief 🤪
    • And so, to round this out, I couldn't be happier to confirm @MBS206 has decided to buy the car. He drove down from sunny QLD with a trailer last week and it is off to its new home today. I'll let Matt confirm on next steps but I understand broadly that the plan is to leave it pretty much as is, and just get some quality wheel time with a nicely balanced car that is pretty much track ready. There are a few a jobs still to be done first but nothing too major and I think its a very smart buy Dinner last night at the Paragon with a round of VBs (mostly) for Neil
    • Well, 50 pages and the end of a chapter for this car. We took it out for a shakedown at Wakie yesterday, and everything went well. There were a couple of niggles: - Oil cooler fitting leak - tightened, cleaned, stopped leaking - Radiator cap overflow fitting was leaking....Mark called it, the overflow fitting was threaded in and not tight....tightened, tested and held pressure - Small oil leak at the rear of the block, probably the turbo oil feed - too hot to get at it comfortably but probably just needs to be nipped up - leak at the driver's side rear brake line where it meets the hardline. Fitting wasn't loose, so Matt backed it off and back on, no further leaks - there's also a leak somewhere on the top of the fuel tank, maybe that cross over fuel line - that was has been left to fix when its on a hoist Otherwise than those niggles the car went great, turned great and stopped great so it was a very successful day out. I'm always really nervous when a car first hits the track after a long break, especially with a brand new engine as well but it was great. VID-20251011-WA0007.mp4  Big thanks to @The Bogan who dropped by and helped out, @MBS206 and my nephew Lachlan the apprentice.  Neil's wife Mel also surprised the hell out of all of us by dropping by; she's up in Tamworth these days but was travelling to Melbourne so had plausible deniability for turning up at the garage, it was great to see her but also obviously a bit sad all round.
    • Skyline R33 Series 2 sedan tail lights in excellent condition. These are becoming harder to find, especially in this state.    BOTH SETS ARE IN FANTASTIC CONDITION (REFER TO PHOTOS)    ✅ No broken covers or cracks ✅ Lenses are in flawless condition ✅ All rear mounting lugs intact ✅ Comes complete as pictured ✅ Perfect for restoration, replacement, or upgrade   These lights are ready to go, no surprises just quality OEM parts.   These are definitely one of the better sets we have seen in a while. With minimal wear and tear they will come as you see. Bear in mind they are not brand new they are almost 30 years old now. To find them in this condition isn’t easy they can only be obtained on the second hand market.   Australia Wide Postage Available At Buyers Expense. Silver Set:$850 Grey Set:$850 PM Me for purchase or any other questions  IMG_2166.dng IMG_2165.dng IMG_2172.dng IMG_2173.dng IMG_2174.dng IMG_2179.dng IMG_2180.dng IMG_2260.dng IMG_2258.dng IMG_2259.dng IMG_2261.dng IMG_2266.dng IMG_2273.dng IMG_2274.dng IMG_2276.dng
×
×
  • Create New...