I am setting up my boost controller to 23 psi. So far I am running close to 22 but still need some fine tunning for better spooling and high RPMs. While plotting the data I notice that the Load plot starts to fall aggressively after 6000 RPMs. Load starts close to 250 at peak load and by redline is just over 200. It that OK?

Are the stock Evo 8 cams causing this drop, Could it be the intake or something else? Or is this normal for a stock head and cams Evo 8. The boost is almost flat from 5000 to redline and it is currently like 21.5 PSI. Below is a plot I made with the Boost (JDMMAP), the Load Calc (divided by 10) so a 20 means a load of 200 and so on; and the AEM Wideband. Does the Load look OK or is it low. Remember this is a stock cammed Evo 8.

 

about right. It maybe more accurate if you can log 2-byte so it's easier to reasoning.

 

I did log the 2 Byte Load but honestly I trust more the Calculated Load. When I am changing my maps based on load the Calculated has been more accurate to define where I am in the fuel and timing maps. Here is a plot adding the 2 Byte Load. It is just a little higher from 4800 and up. Here is the plot. Calculated Load is in Magenta, 2 Byte Load is in Red.

 

That's probably about right for stock cams on an 8. Your load is still at almost 230 at 7000 RPM. The 2-byte load is definitely more accurate than the calculated and you're probably better off not logging calculated load at all so you can get more samples of important data.

 

I am working on a Map without correction for 23 PSI. On this run I was close to 21 but I am going slow with the increments in WGDC. Hopefully I will test it late tonight making a few pulls on the highway.

Maybe I am being too shy with the new 20G that I just installed. On this run my WGDC were at 78% at 7000 RPM with the stock intake.

 

I just complete a couple of 3rd gear pull tonight . The load is now higher; peak is about 260 and 220 by redline. Here is an updated plot with tonights 3rd gear pull. Do the load values looks OK ? This was done at 23PSI. Stock cams Evo 8.

 

Am I reading the boost plot incorrectly, or are you only seeing 16# by 3500 RPM? It looks to be spooling up a bit slow. Granted I am no good at deciphering graphic representations.

 

It should be a bit slower than stock because it is a stock turbo appearance 20G. It has bigger turbine (11 blades) and a bigger 20G compressor. I am not sure how much slower it is. I also added a Perrin FMIC which is A LOT bigger than stock so it has to be filled up before boost starts to build. I do not feel any noticeable lag but maybe I got used to it. It also depends where you start the pull, on the previous plot I was seeing 21# at 3500 rpm.

 

I wrongly assumed that you were still on the stock VIII turbo. Duh, I guess I didn't read the modlist in your sig. So, taking the larger 20G into account, the spoolup is about what one might expect(Lowenbrau).

 

Do you have any idea how this spooling compares to an FP Green? I am just curious. IMHO this turbo spools preety fast but since I have no experience with a Evo IX Turbo or a Green I have no way to compare it. Before this I have the stock 9.8 dual flapper Evo 8 turbo). Like I said I have not notice any big difference in lag but you also get use to what you have. I just installed the Turbo 2 weeks ago.