Strange Idle - after fuel pump swap (E85)

Spooler · 08-24-2021, 12:51 PM

Quote:

Originally Posted by Jhill

So I’ll just throw in my experience as I’m similar setup with aem pumps in radium kit running 51 psi, stillen intake, stillen exhaust, Bosch ev14 550cc injectors tuned by seb and on e85 and my idle is completely fine so I’d say just a hunch but less to do with running e85 on a z and more to do with the 1050 injectors. That’s a lot of injector for an NA car anyway and from what I’ve ever heard and read is the larger the injector the harder it is to get a controlled idle as that’s where the engine is pickiest and the hardest point to control a large injector.

It is all in the tune. I run 1700cc injectors and have no issues. Do you need that large of an injector NA. That would be a no.

Jhill · 08-24-2021, 05:06 PM

Quote:

Originally Posted by Spooler

It is all in the tune. I run 1700cc injectors and have no issues. Do you need that large of an injector NA. That would be a no.

I guess I meant to say it’s not impossible just much more finicky and needs tighter controls at idle as well as really good injectors and for an NA engine not necessary so why bother with the headache. Known others with high boost 4 cylinders that require larger injectors and most have always noticed a decrease in idle stability after but have to deal with it as it’s needed for high boost levels and no way to do a multi injector setup.

Rusty · 08-24-2021, 05:58 PM

Quote:

Originally Posted by Jhill

I guess I meant to say it’s not impossible just much more finicky and needs tighter controls at idle as well as really good injectors and for an NA engine not necessary so why bother with the headache. Known others with high boost 4 cylinders that require larger injectors and most have always noticed a decrease in idle stability after but have to deal with it as it’s needed for high boost levels and no way to do a multi injector setup.

You could do a multi injector set-up. BUT.......how much MONEY and time do you want to throw at it?

Spooler · 08-24-2021, 09:45 PM

Quote:

Originally Posted by Jhill

I guess I meant to say it’s not impossible just much more finicky and needs tighter controls at idle as well as really good injectors and for an NA engine not necessary so why bother with the headache. Known others with high boost 4 cylinders that require larger injectors and most have always noticed a decrease in idle stability after but have to deal with it as it’s needed for high boost levels and no way to do a multi injector setup.

It is always NA at idle. It just requires more fine tuning for the tuner with larger injectors.

BossJ · 08-25-2021, 12:43 AM

Quote:

Originally Posted by Spooler

It is always NA at idle. It just requires more fine tuning for the tuner with larger injectors.

So if you guys were me, do I go back to seb and ask him again?

He’s already aware of what it’s doing. Said tune looks solid / maybe it’s the WB O2?

Again it’s not stalling or anything - it happens 1-3 times in the first 5-10 minutes of driving and then it’s like it learns and adjusts fine. AFR is perfect other than when this happens. I can probably live with it. Just wanted to make sure it isn’t going to cause a future issue.

Jhill · 08-25-2021, 01:07 AM

Quote:

Originally Posted by Spooler

It is always NA at idle. It just requires more fine tuning for the tuner with larger injectors.

I’m aware of this which is exactly the issue. Essentially you need a fire hose at WOT to put out the fire but now your still left with a fire hose at idle to put out a mild camp fire. So your trying to control a trickle out of a fire hose without completely flooding the campsite.

DOOMMONKEY777 · 08-25-2021, 01:34 AM

Am running 1050x injectors having the same problem at idle when cold start, after driving the car for a minute, then i go to idle, the revs are planted at 900rpm(that's the setting), but i know its a tune issue 100%. Because the ECU fine trims everything, i also noticed that at warmer OAT 80F+ the car does not have this issue.

Spooler · 08-25-2021, 01:15 PM

Quote:

Originally Posted by Jhill

I’m aware of this which is exactly the issue. Essentially you need a fire hose at WOT to put out the fire but now your still left with a fire hose at idle to put out a mild camp fire. So your trying to control a trickle out of a fire hose without completely flooding the campsite.

LOL, you guys have no idea. The only issue I hate is for flex fuel tuning. When you fill up with 93 oct. instead of E85 it sends the ECU into a freak out mode. The idle is for chit, all over the place This little idle issue op has stated is nothing to worry about. You want to know why I stay on E85 all the time, this is it.

Jhill · 08-25-2021, 09:57 PM

Quote:

Originally Posted by Spooler

LOL, you guys have no idea. The only issue I hate is for flex fuel tuning. When you fill up with 93 oct. instead of E85 it sends the ECU into a freak out mode. The idle is for chit, all over the place This little idle issue op has stated is nothing to worry about. You want to know why I stay on E85 all the time, this is it.

Can’t say I’ve experienced the same issue (only have 91 here but shouldn’t be that different). Switched back and fourth 3 times already this month and ecu adapts immediately without any noticeable change.

Spooler · 08-25-2021, 10:17 PM

Quote:

Originally Posted by Jhill

Can’t say I’ve experienced the same issue (only have 91 here but shouldn’t be that different). Switched back and fourth 3 times already this month and ecu adapts immediately without any noticeable change.

With 1700cc injectors, this is a freaking issue. LOL

HisStigness · 08-25-2021, 02:31 PM

I’m running E85 on Ecutek with a flex fuel setup, GT-R injectors, AEM 340 pump. No idle issues.

Jhill · 08-25-2021, 11:01 PM

Quote:

Originally Posted by Spooler

It is all in the tune. I run 1700cc injectors and have no issues. Do you need that large of an injector NA. That would be a no.

Just a refresher.

Spooler · 08-25-2021, 11:37 PM

Quote:

Originally Posted by Jhill

Just a refresher.

Whatever, you don't get it because you have no idea what I am talking about.

08-25-2021, 01:34 AM	#7 (permalink)
DOOMMONKEY777 A True Z Fanatic Join Date: Sep 2010 Location: Crooklyn Posts: 1,014 Drives: 370Z 6psd-sport-pkg Rep Power: 21	Am running 1050x injectors having the same problem at idle when cold start, after driving the car for a minute, then i go to idle, the revs are planted at 900rpm(that's the setting), but i know its a tune issue 100%. Because the ECU fine trims everything, i also noticed that at warmer OAT 80F+ the car does not have this issue. __________________ Kids don't do Drugs, Drugs are bad, so let the professional druggies do Drugs for you. 537whp/496lb/tq@8-9PSI 93 octane

08-25-2021, 02:31 PM	#11 (permalink)
HisStigness Base Member Join Date: Jan 2014 Location: San Ramon Posts: 65 Drives: 10 370Z Sport 6MT Rep Power: 12	I’m running E85 on Ecutek with a flex fuel setup, GT-R injectors, AEM 340 pump. No idle issues. __________________ Stillen \| Fast Intentions \| Setrab \| GT-R injectors \| CJM \| Radium Engineering \| Ecutek (Eugene Turkov) \| E85 \| Racing Brake \| Endless \| Goodridge \| Z1 \| AME \| HKS \| Whiteline \| SPL \| Hotchkis \| Z Speed

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
[FOR SALE] OEM Fuel Pump Assembly and extra OEM Fuel Pump	turtle64b	Parts for sale (Private Classifieds)	34	04-29-2020 01:19 PM
Strange idle upon fueling up 2015z	Exhaust	Nissan 370Z General Discussions	17	10-17-2016 07:09 PM
Possible inexpensive fuel starve fix (no more $1200 fuel pump system!)	Nismodean	Nissan 370Z General Discussions	2	02-18-2016 12:32 PM
[FOR SALE] CJMotorsports 370z fuel starvation elimination kit, fuel pump brand new	cossie1600	Parts for sale (Private Classifieds)	3	12-10-2015 09:43 PM
Strange idle problem with GTM SC Stage 1	wind.zero	Forced Induction	39	03-12-2014 03:49 PM