Hello guys,
I just installed my vortech supercharger, and the installation went smooth. I am runing car now.. did about 200Km. and I can still smell the SC.

Anyway, I have a problem after 6000RPM, as the engine goes lean......... Has anyone solved this problem..

My Spec.


2003 Model (New Car.. did 3000Km.. Sold my old '00)
Spoon Headers...
Spoon Body throtle..
Amuse Dual Ti exshaut........


Goes lean after 65000RPM


Yeah. 300Hp.. and the 225 is not stock. but with the Spoon Bodythrottle, headers and exhaust

Please let me know.. I have tried twice to install VAFC.. but no hope.. so No VAFC i just gave up!

Thanks in advance for ur help

Omran

 

[QUOTE]
xviper wrote on 12-16-03 08:58PM:
I have never dynoed my car, so I do not have a wideband O2 reading on it.

 

.. no one replied

 

So was mine, it would ping if I floored it down low, say, 4000 rpm.


Anything above 6000, it was a little lean, but there was 0 pinging. Tuner recommended no long highway pulls. I ran it like that for a little while with no audible detonation, no troubles. Now I have an AEM EMS, bigger injectors... bleh bleh bleh....

 

Your A/F ratio looks pretty good to me. You are running in the 13's to 1 ratio which is ok. If the VAFC does not help that means that you are saturating your injectors or not enough fuel pump delivery.

However, I see that the mixture has richen at the end of the RPM range, where you may be able to tune it with the VAFC after 6500RPM. Note that the VTEC kicking in may require a sudden increase in fuel demand so your adjustments to richen up the mixture should start 500 to 1000 RPM before or more.

 

I think you are closer to the 14 to 1 ratio at some pionts.

@ 4700 RPM = 1.0 Lambda = +/-14.7:1

Between 6300 and 8000 RPM 0.95 Lambda = +/-14:1

As you say these readins are a little on the lean side. However as Xviper says if you were measuring at the tail pipe you could subtract 0.1 to 0.3 from these figures giving you 14.5 and 13.9 respectively. This is still on the high side and I would not want to run my car that lean, especially for long periods over 6300 RPM.

Sadly as stated the V-AFC as far as I understand it can only "lean out" the mixture, not add fuel. To do this you need to increase the underlying fuel flow and then cut it back using the V-AFC. Again as Xviper says you need to look at injectors, fuel pressure etc to achieve the increased fuel flow. Or of course you could go full E-manage and directly control the injector cycle.

I will be checking my AF ratio in more detail when I fit the V-AFC. I also run a Vortec but without any other mods, so I hope I am not in the same situation as yourself.

 

is this situation occurs only with Vortech users?


Dubai are the 3rd user that has this "problem" as far as I know

good look.

you could play with the FMU to get a bit more fuel

 

I forgot to mention that my Vortec installation is only generating 275 Peak RWHP so I expect it is running a little richer than yours. My starting RWHP was also lower at about 190.
When I had it on the Dyno the tuner said the AF ratio was at acceptable levels, however I do not have a record of the actual readings, as I say I will do this when I fine tune with the V-AFC.
I think your problem is probably due to the combination of mods you have installed, and not directly as a result of the Vortec installation on its own.

Beware Big Power = Possible Big Problems

 

Thank you so much guys for the wuick reply, I will take these notes to my mechanic and discusset to see how to resolve this problem.. ! I just don't feel very confidend.. although the car is a BULLET!..

kstokell, well as I see, u have an old S2000. 2000 model.. 190Hp is great. I also got the same HP.. because the older model had a different ECU.. This was my results for my old s2000 . 2000 model.



I will still have more Question.. as I am still new to SC mods........

What is

1) AEM EMS, bigger injectors... ? ?? ...................Where can I find more info.. how do they look like. I know injectors, but why mine is not good?
2) full E-manage and directly control the injector cycle. ??? ......... Again what is E management sys.. is it the ECU!... the VAFC was working, but it was not reading from the engine??n.. so I gave up on it


Thanks again for ur help guys, I really appreciate it

 

If you go to the following link you can read about the Greddy Emanage system:

http://www.mohdparts.com/emanage/manuals/e...oftware_manual/

To vary the amount of fuel entering the combustion chamber you need to vary the "injector cycle" this is effectively the time that the injector is open (delivering fuel).

Kevin