Wierd JRSC LEAN issue

beat · Post by **beat** » Mon Mar 30, 2009 1:22 pm

I just started tuning my LHT JRSC today.
I have an original JDM B18C type R engine.

I am running:
- LHT JRSC setup with MVM stepper pulley boosting at 8psi
- T1R 725cc injectors
- stock fuel pump, fuel rail, FPR

I uploaded the B18C JRSC map and tried to use it at a base map and it was REALLY LEAN.... I saw a 17:1 AFR and I was not even lose to high rpms, so I stopped. Then dumped 40% more fuel for the car to run at 11:1 AFR. Stopped at there and will tune again another day.

Any idea why those base maps are that far off?

Post by **Spunkster** » Mon Mar 30, 2009 1:57 pm

You are using completely different injectors than what that calibration was tuned with. They have different flow rates. Also the calibration used a walbro 255 fuel pump.

RagingAngel · Post by **RagingAngel** » Tue Mar 31, 2009 1:55 am

Is there a preferred method of what would produce the best results?

1) use smaller injectors but higher fuel pressure and bigger fuel pump?

2) use stock FPR/pump and just big (725cc) injectors?

3) use "medium" (550cc) injectors, uprated fuel pump and stock FPR?

Number 3 is what LHT has recommended to their JRSC customers. I was wondering if there was any specific pros and cons to any of the above setups?

Post by **Spunkster** » Tue Mar 31, 2009 9:20 am

It is really up to you, as long as it is tuned properly with whatever setup you are using.

beat · Post by **beat** » Tue Mar 31, 2009 11:57 am

Is there a base map that is suitable to run for the setup I have?

Post by **Spunkster** » Tue Mar 31, 2009 12:08 pm

Any basemap you use will need to have changes made and then it will need to have the AF timing tuned properly to run safely.

beat · Post by **beat** » Wed Apr 01, 2009 1:35 am

Any idea which base map will be closer to start with and what kind of adjustments to ign and fuel?

Post by **Spunkster** » Wed Apr 01, 2009 9:13 am

Probably the one you have started with...the other option is to start from a completely stock base map. All basemaps can be found by going to File, New.