I have had the car road tuned by Scot Gray and dyno tuned by Harmon Motive. I have continued to execute datalogging via Evoscan and have made refinements to my maps. I am running 91 CA gas.

My mods are as follows:
Work drop-in
2.75 in dp
RRE HFC
3in exhaust
Walbro 255 FP
Dejon MBC peak 22psi

I am installing Denso 720s (balanced by RC Engineering and HKS 272 cams.

I know that I will have to adjust injector scaling and have some preliminary settings for the injector latency voltages.

How should I adjust my initial retune to accomodate the cams? The goal is to adjust the fuel tables to make the car safely drivable. I don't have access to a WB O2 yet (as required for a complete tune). Should I run stock fuel tables, or just add a couple of points into my current tune? Maybe someone has a conservative base map for me to start with.

Thanks for any help.

 

For the precise tune especially when it comes down to fuel wideband is a must.

 

You will need a wideband to get your fuel trims correct.

 

A wideband is available for my use, just not at the time that my car is getting picked up after install. Just trying to avoid outrageous knock on the way home.

 

RC should provide some sort of ball park latency and scaling numbers. I wouldnt trust them for final numbers but they should get you home. I know deuchworks provides them. If not you may want to find someone with the same injectors and steal their numbers.

 

Thanks. I now have a plan of attack that will work for me.

 

You don't need a wideband for fuel trims... just a working front O2 sensor and a generic OBD logger such as OBD ScanTech.

This will tell you how much, in %, the ECU is adding or subtracting from the MAF reading to get the front O2 to read stoich (14.7)

 

True but it will make life alot easier...since you can force Open Loop mode and adjust the Scalings and Latencies faster than waiting on the trims to update.

 

https://www.evolutionm.net/forums/sh...d.php?t=207924