Idle is very lean!?

FlashPro questions & answers specific to the FN2 European Civic Type R
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R-12914
Posts: 349
Joined: Sun Dec 01, 2013 12:13 pm
Location: Germany/Bavaria

Idle is very lean!?

Post by R-12914 »

Hi Hondata,

if i run my FN2 s/c on idle with or without A/C, the engine runs very lean at about +9/+13 s.trim, closed loop lambda is correct @1.00:
xy.JPG
xy.JPG (42.92 KiB) Viewed 4593 times

Idle and s.trim with A/C on:
9.JPG
9.JPG (69.82 KiB) Viewed 4593 times
Idle and s.trim with A/C off:
13.JPG
13.JPG (72.05 KiB) Viewed 4593 times
Is it possible to make the Idle more rich or what is a optimal idle-s.trim value?

Thanks!
2008 Honda Civic TypeR FN2
Rotrex C30-94 supercharged with relocated IAT
Powered by ASNU 092/FP330E fuel pump & ASNU 090/750cc fuel injectors
------------------------
ECU: 37820-RSP-E02
Flashpro: FP-SI-INT-21153
Software: 3.6.1.0
Firmware: 185
User avatar
R-12914
Posts: 349
Joined: Sun Dec 01, 2013 12:13 pm
Location: Germany/Bavaria

Re: Idle is very lean!?

Post by R-12914 »

Hondata,

any news about this?
2008 Honda Civic TypeR FN2
Rotrex C30-94 supercharged with relocated IAT
Powered by ASNU 092/FP330E fuel pump & ASNU 090/750cc fuel injectors
------------------------
ECU: 37820-RSP-E02
Flashpro: FP-SI-INT-21153
Software: 3.6.1.0
Firmware: 185
User avatar
R-12914
Posts: 349
Joined: Sun Dec 01, 2013 12:13 pm
Location: Germany/Bavaria

Re: Idle is very lean!?

Post by R-12914 »

My Car is a FN2 with Rotrex C30-94 Supercharger and RC 750CC Injectors.

I have made a another datalog.
The idle you can see at the end of the datalog.

Please take a look on it!

The Map and Datalog see below!
MS_RotrexC30-94_4BAR-HYBRID_06-01-2017.fpcal
(19.71 KiB) Downloaded 167 times
Datalog#1_06-01-2017_Run-Pulls-Idle.fpdl
(3.18 MiB) Downloaded 181 times
Datalog_warm_IAT-NEU_Idle.fpdl
(283.15 KiB) Downloaded 174 times
2008 Honda Civic TypeR FN2
Rotrex C30-94 supercharged with relocated IAT
Powered by ASNU 092/FP330E fuel pump & ASNU 090/750cc fuel injectors
------------------------
ECU: 37820-RSP-E02
Flashpro: FP-SI-INT-21153
Software: 3.6.1.0
Firmware: 185
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Spunkster
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Posts: 22745
Joined: Fri Sep 20, 2002 5:06 pm
Location: Hondata

Re: Idle is very lean!?

Post by Spunkster »

Has this been properly tuned on the dyno?
User avatar
R-12914
Posts: 349
Joined: Sun Dec 01, 2013 12:13 pm
Location: Germany/Bavaria

Re: Idle is very lean!?

Post by R-12914 »

Spunkster wrote:Has this been properly tuned on the dyno?
No, on the road!
2008 Honda Civic TypeR FN2
Rotrex C30-94 supercharged with relocated IAT
Powered by ASNU 092/FP330E fuel pump & ASNU 090/750cc fuel injectors
------------------------
ECU: 37820-RSP-E02
Flashpro: FP-SI-INT-21153
Software: 3.6.1.0
Firmware: 185
User avatar
Spunkster
Site Admin
Posts: 22745
Joined: Fri Sep 20, 2002 5:06 pm
Location: Hondata

Re: Idle is very lean!?

Post by Spunkster »

It may have something to do with the manifold design. Have you discussed the issue with a professional tuner?
typer86
Posts: 342
Joined: Sun Oct 28, 2012 3:17 pm

Re: Idle is very lean!?

Post by typer86 »

I have the same kit mounted. With my old RC 750 injectors and the little 650s... Strim was 0 or little rich but never +10 or higher...
With my dw800 and the tts layout all good.

Did you have no idea what could be wrong? Maybe bad injectors, fuel pump, o-rings?
typer86
Posts: 342
Joined: Sun Oct 28, 2012 3:17 pm

Re: Idle is very lean!? /resolved

Post by typer86 »

Spunkster wrote:It may have something to do with the manifold design. Have you discussed the issue with a professional tuner?
SOLUTION found

I found the issue for this case.
Deadtimes of the RC750kit which is mounted is unfortunately to high. (We used the deadtimes from your RC750 starting calibration but tests confirm that it does not match for this kit... Total creazy because other kits which I have seen working fine with your default values...)

So we are currently determine the correct value for this injector kit so we can say the idle + low load the S.TRIM values will be the same...

Update: MAF sensor is going bad... Adjusting the deadtimes does not fix this effect as expected.
First check with an other MAF - the readings AFMflow Volts are OK - new part is ordered...
User avatar
R-12914
Posts: 349
Joined: Sun Dec 01, 2013 12:13 pm
Location: Germany/Bavaria

Re: Idle is very lean!?

Post by R-12914 »

No, the problem was a leak (o-rings) of the injectors (manifold-sided).

The problem was solved with new seals together with new ASNU (customized) injectors!
2008 Honda Civic TypeR FN2
Rotrex C30-94 supercharged with relocated IAT
Powered by ASNU 092/FP330E fuel pump & ASNU 090/750cc fuel injectors
------------------------
ECU: 37820-RSP-E02
Flashpro: FP-SI-INT-21153
Software: 3.6.1.0
Firmware: 185
typer86
Posts: 342
Joined: Sun Oct 28, 2012 3:17 pm

Re: Idle is very lean!?

Post by typer86 »

R-12914 wrote:No, the problem was a leak (o-rings) of the injectors (manifold-sided).

The problem was solved with new seals together with new ASNU (customized) injectors!
Additional:
The black pipe which is connected to the rotrex was not sealed completely which cause wrong air passed the MAF sensor...
After fix the air leak, XY s.trim vs AFM.c curve looks perfect.
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