Hey all. Ive been keeping track of this forum since i got my cable almost 8 months ago. So far i have done the 2-byte load in ecuflash, and injector duty cycle and WGDC in evoscan. Ive leaned out and changed the timing. I read the howto on boost control via ecuflash and bcs pill so i did that this morning, and yes a #58 drill bit is very small, keep it oiled/lubricated while you drill. Ok so my first attempt on making boost was making zeroing the boost error correction and chaning desired load to 159.4 all the way, changing boost offset to 80 (or 100) i dont remember, and i was planning to control boost via max wastegate duty. well i flashed it and got on the road and..... 17 psi strong (wastegate mechanial actuation). haha, i had 0% WGDC. I was doing this on a sunday afternoon on lower base (i work/live on a navy sub base).. so lots of empty parking lots and no work on a sunday afternoon. So i pull in and reflash to 100% stock (with 2 byte mod) and boom, i hit it and it spikes to ~25psi and tapers to 18-19psi. wow... yeah. i then got a little more confident and put my leaner than stock map and modified ign map back on and changed boost offset to 100 and desired load to 159.4 i left max wastegate duty at 100 and didnt change boost error correction. boost limit to 255. I then made 253 load @ 4000rpm ~25 psi spike--- 22-23 psi taper. voidhawk was talking about this in the howto thread about using desired load to control boost, but we have to use max wastegate duty to control the boost (like a mbc). Now the neat thing is the WGDC during my run was 100% the entire time, so did just get lucky with the modified pill so that im not overboosting (25+) psi. ok lemme know what you think here is my pics.



Any ideas/suggestions!! ECUFlash rocks..

 

Do some 4th and 5th gear pulls and it will overboost. That is not the 'proper' way to set ecu boost.

You need to set the BDEL to the loads you are hitting all through the RPM band. If you do not, you will overboost in higher gears, even with error correction.

You use the WGDC to set actual boost and the BDEL to the target load, this way you are actually using the closed-loop error correction.

25psi is a bit on a 03 evo on WA gas, right now you are getting away with it because you are running -4 timing at peak boost.

once you set everything correctly, your boost will also be more stable and more consistant in all gears.

Also, if you do it like you where doing it before with error correction zeroed out and just WGDC you will also overboost in higher gears.

 

ok so your saying to use the stock 'closed' loop boost control. which i agree with, closed loop is better/safer. however the howto pointed me to use open loop waste gate duty cycle controlled. ill do some more work on my maps and go drive tommorow (i dont drive after i drink). so my boost offset is 100 and i hit 250 peak load, so i need to set my bdel at 150 @ peak rpm and taper down. sorry for being a big n00b but isnt a (-) negative timing more aggressive? thanks

 

Yes, so something like this:



Take this as an example only, you need to set the correct BDEL and WGDC for your car as every evo is different.

-4* is not aggressive at all.

 

ok so. the more advanced timing is, the more 'agressive' it is, i should go read a book or something. and you set bdel to your load curve and wgdc as a 'max' boost. i assume max wgdc is for entering boost from various rpms, to 'catch' the boost spike at higher rpm as it spools. so if you set it up right, our ecu is a lot better than a mbc, or even like a greddy profec with its 'gain and attack' crap. lol so the best deal is for me to get some 3rd and 4th pulls and map out max wgdc. i can interpolate bdel from what i have in evoscan. i guess load could change in the longer (3rd and 4th gears). more to come.

 

razorlab, thanks for the guidance, you prob saved a evo from a trip down interstate WA-3 ending in a phone call to a tow truck. lol

 

Hehe, no problem. Tuning it in with BDEL and error correction will be a little aggravating at first as it makes it a little complicated to tune but once you get the hang of it, it will be much better.