Maybe quite a dumb question, but can you confirm that 1byte load is the correct input to use while tuning boost.
I can't understand how the ecu determines the "Load error". Is it based on the 1 byte load I log and the target given by my tune (BDEL + offset) ? or does the ecu "use" a different load input ?

 

I was always wondering this for both the CT9A and CZ4A, but I have never seen an answer.

You might be able to look at mrfred's direct boost control mod and compare the address it points to for what is changed from load to boost and see if that matches the load value in the MUT Table / logging address.

 

There are several different load calcs. For tephra v7 (CT9A), I believe that tephra uses uncompensated load in the 1 byte load calc, while the factory boost control algorithm uses baro+airtemp compensated load.

 

Actually only 9417 V7 uses 1/2byte load. The other V7s ROMs use the baro+temp comp load.

 

Thanks for the answers

 

I do not know if this has been mentioned.. if you want to make a plug and play solution without cutting the loom, I think the connectors on evo's are made by sumitomo.. this should be the HX 2 way connector..

http://www.sws.co.jp/en/product/connector/pdf/wp_hx.pdf

maybe you could buy the male connector and make a patch cable.. like tactrix does for their 3port..

 

spoolinup.com has a p-n-p connector for the GM 3-port.

 

darn, thanks for that link... they have the MAF connector that I am looking for this whole afternoon..

 

I installed my new GM BCS last night and I'm having trouble getting any reasonable boost out of it. I'm running 96530706 on an Evo 8 at the moment and before the upgrade I was getting anywhere from 18 to 21psi. After the new BCS went in I can't get past 10psi.

I zeroed out my boost correction table and started off with the WGDC at 50 and went up from there. The boost just didn't change as the WGDC increased. It's on 100 now and I'm still only getting 10psi. Attached is a log and here's a graph showing what's happening (in 3rd and 4th gears).

I don't *think* there's any leaks in the tubing, but I'll replace all the hoses tonight with new fresh ones. Also I took out all the restrictors.

The thing that threw me during the installation was that the stock BCS was a dual solenoid, not a single. It looked like both solenoids were connected to the same set of hoses (presumably with different restrictors in each side?) so I took them both out and replaced them with the new single GM one. The original solenoids had a grey and a black connector, and I used the black connector because it fit in the harness I got from spoolinup. The grey connector is now not connected to anything.

 

yeh you need to use fresh vacuum lines.

you cant reuse the existing ones

 

I didn't use the factory ones, they are all sitting to the side to make reverting this change easier. However I did use second-hand hoses off a mate's VR4 rally car, so there's a couple of joiners in each hose. I could blow through each one unrestricted so I figured they'd probably work just fine (and couldn't blow through once I plugged one end). It's messy though which is why I was going to replace them tonight anyway.

 

well either your using the wrong ports on the 3port, or the wrong connector

 

definitely remove the 100%'s unless you dont like your engine running or turbo lol. it definitely is hooked up wrong or theres a huge boost leak if its not boosting high with 100% wgdc and zero'ed out bec.

 

Alright, thanks for the help guys. That's pretty much what I assumed too, and tonight I'll pull off the airbox again and replace all the hoses.

Does anyone know if I used the correct connector from the old dual-solenoid harness? The other solenoid's connector (the gray one) is still 2-wires but has a slightly different plug so I ignored it.

Do I need to have something connected to the other plug?

 

Please stop with your "100% WGDC" misinformed warpath.

Evo 8/9/10/RA all run 100% WGDC from the factory, I've tuned hundreds of cars at 100% WGDC up top with no issues and even my personal Evo has run 100% WGDC for going on 6 years now with no engine failures or turbo failures. Running 100% WGDC does not generally mean you are over spinning or over working a turbocharger.

So please see how your warpath is misleading. Share proper information.