Ive recently just ditched my hks evc for a gm boost solenoid.

With the hks evc at first I couldnt get more than 25psi peak tapering to 22-23psi at redline. So I tried turning my wastegate actuator 2 full turns to see what I could get out of it.

I got 26 psi at first for a while then I saw 27 psi sometimes never anything consistent.

So now with the gm solenoid Im still in the process of tuning the tables but Im shooting for 30 psi peak tapering to 23 psi at 7-7.5k. But Im also holding 30 psi till about 5k to where it tapers off finally.

Car feels really good now but with the upped boost Im seeing load of 320 and up normally. If anyone wants to see a log I would have to send it to you. I will how ever post a pic of my rom.



Im curious if I should be raising my bclo to accomodate the higher loads ? I have re-scaled my maps and such. Im just not sure on what else if anything to do.

Also upon reading a few of gst or razorlab's post about how he tunes boost I have my bec tables set aggressively on the positive side.

 

More boost = more airflow and thus a higher load. You already have your tables scaled to cover the new load so there really isn't a need to worry about it.

In looking at your settings....your boost limit tables appear to be the reason for the severe taper after 5K. Look at them closely and you will see that after 5K is when you start to decrease the values. Wher is your "Boost Desired Engine Load #1" table?

I tune by boost with an AVC-R. I have it set to hold boost flat with as little taper as little as possible. To accomplish this I have to raise the correction values in the upper RPM. My correction values are simular to the limit tables on your MAP.

The limit values are very sensitive. You should tinker a little and see if you can get boost to hold a little better. Another thing to consider that a 30PSI spike that rapidly tapers isn't the most efficient way to tune a turbo. The spike should be a smooth raise in the logged graph that slowly tapers lower.

Another thing to consider is running smoother boost with a little more timing. It will make the boost come on stronger. The load values I am talking about is between 100 and 180 load between 2500 and 7000. You have some room to get a bit more agressive. By upping the timing in this load area you will make the car a ton more responsive. You should see an increase in low end torque too.

The moral of my strory is that 30PSI spike that tapers severly isn't the best way (in my opinion) to tune for a smooth car. The high pressure spikes are difficult to control consistantly. Temperature and barometric pressure will affect the boost spike considerably. I would rather have a car tuned to hold 25psi that comes on hard at 3K RPM and holds till redline, than a car with a 30psi spike that falls to 22psi.

Take it for what it's worth. I am far from the "expert".

Paul

 

is this on the ported 9 turbo? on pump?

 

i am suprised you can hold that kind of boost...23 psi after a 30 psi spike is impressive. what are your mods?

ur maps looks good though, i am guessing this is a stock 9 turbo?

 

if this is on stock turbo/91, I wouldnt run 30 psi!!! It might feel good for a short while, but you are taking the turbo out of its efficiency (*spell) range! Which will shoten the lifespan of the turbo... Also 91 octane doesnt have enough det. resistance to handle 30 psi consistently. You might get 1 clean pull, but I bet if you log a few back to back, you wont be happy... Also 23+ @ redline... Is out of the efficiency range again... 21 is the standard, 22 is pushing it. Again, its possible, just not good for the turbo... All of the things Im saying are from tuners, so Im not just coming out of my touche w/ this...
Just throwing that out there... Its your ride, and you can tune it how you like! Im sure it feels real nice right now, but like I said, youll pay for it in the end...

OK on to your maps... First thing I noticed is in your BEC, you have + numbers in the map where you should have - numbers... So it will actually add WGDC, instead of pulling it!

Also Im noticing you haveWGDC set to 100% till 3250. I think this will cause you to overboost in higher gears. you can get away w/ this when utilizing gear dependent boost control tho... Try setting it w/ 90% @ 3000, 80% @ 3250.
just my .02...

Also, I noticed you have 24.6 almost the entire map... During spool up, you will always be @ -3 error. I find that I get better spool up, when you set up the boost table from what you see in your logs... Ex. I see ~5psi @ 2500, so I set it up w/ 5.5 @ 2500, then @ 3000, I see 13.5 - 14psi, so I set the map up w/ 14psi, etc. This way, the boost will be on point, and not have to use the corrections as much... Which should result in better spool up!
This is the second time today, I have posted this info up...
everything else seems to be fine!

Just for reference, I was aiming for higher boost, (27psi) before I had the "knock cell" and I was happy w/ the TQ increase, but didnt know my car was knocking like a ****... I now shoot for 24.5 - 25 psi max Which, according to who taught me, 24 psi is still a bit too much, for 91... I dont shoot for a knock free car, so I push it, just a tad...

Like I said, just my .02... I bet 30 psi feels real good tho.

 

lots of 2 cents

good stuff though. i spike to 25 psi and hold to around 23 psi and to me this is pushing the turbo too hard (then again i map switch to 12 psi 99% of the time so i guess i am pretty safe).

i would love to go to this direct boost control but i cannot find it from my map so i use load based which should be pretty similar.

 

I feel that any time you are running the turbo at 100% WGDC for more than at 7500-8000 (even then) you are outside the turbo efficiency range. AND if you are running 100% WGDC you should be monitoring EGTs. But that's just me.

 

once I get started, my fingers just keep going... What rom id? What do you mean, you can not find it from your map? To get "direct Boost control" you need to patch it to your .xml's.

 

Thanks for the input guys. Based on what each of you said I will most definitely be redoing my tables to see if is helps.

Just to put it out there again Im on 93 and 50/50 meth with a ported evo 9 turbo. My mods once again are down below in my signature. So obviously because of the meth that would be why my timing maps and boost are so aggresive and high.

I will also back down my wgdc in the upper areas to see what the results will be.

I actually did like 4 pulls on the way home from school tonight and Im not over boosting by any means Im actually under my target at 3500 by about 3 psi and at 5500 Im still seeing 29 psi with 24 psi by redline.

Whether or not the turbo is puffin or not I dont know. The car has shown increases all along the way and it is noticeable. I went to the track last friday night on a salvaged rain day for test and tune session.

I ran a best of 12.3 at 115 with a 1.8ft and many other 12.4 pass's. All night I was spinning through first seeing it was cold and not much rubber on the track either.

I hate giving excuses but I went down the track over 10 times, and I didnt want to stop until I at least saw a flat 12.0.

 

Im a lil embarased, apparently I missed your entire sig...

Its interesting that you were overshooting by 2psi, you take 2% duty cycle out, and your now 3 psi under?
I have no experience w/ meth.
Then from what I gathered about meth, and thats not much, but I think ~ 25-27psi is w/ in reason. sorry bout that. Just lookin out.

Put 80% back into your WGDC maps, and see what that nets you. Follow the rpm points, and add/subtract as you need, to create your preferred curve.

Did you change your BEC to - numbers on the bottom half of your map, so it doesnt add, when its supposed to be pulling?

Thats some port job, holding 24 psi up top...

 

I bought the turbo off a forum member. It came off a BR 350 Evo so I guess he did a nice job porting it. lol.

Based on what you guys said I changed my wgdc, bec table along with my baseline boost tables to reflect what you guys told me.

Only thing Im trying to figure out is getting my max psi sooner its been acting a little sluggish. I got to figure out what I changed because Im getting this weird drop in 2 byte load but Im showing no knock and my timing is fine.

 

88580014, all i need are the xmls and i can put em in.

u should try 1 byte load, from what i read its a lot less problematic that 2 byte.

also u should be in the high 11 second region with those mods..

and oh yeah i hate you for having a ported turbo and meth

 

post up another log, well see if theres anything that stands out. What type of dip in load? Like a small lil dip, or a huge spike/dip? I have made the switch to 1 byte load as recommended by rolly, because of the spikes. 1 it only uses 1byte, rather than 2, so it speeds up the logging a bit, it spikes a whole lot less than 2byte, and is just as accurate!

 

X2, i have been using it for quite sometime and never had a spike as i have seen. plus its already written into tephra's mod (5.10). you can see his post on how to edit the data.xml in evoscan or post here.

nonschlont any idea where i can get the direct boost control for 88580014?

 

Id post up a log but I cant attach the csv file here. Ive been trying to figure out how people go about posting them.

I would open it in excel but this computer doesnt have it.

Ill get a few more logs today. I meant to get a few last night after school but I had adjusted my TPS so I would get a full 100% at WOT and not 94% like its been. But when I adjusted it, it raised my idle and I forgot to adjust the throttle cable so I got to fix that.