What kind of numbers did you get on the dyno? Did you get a dyno before and after installation of the gm bcs? If so, what's the difference in power?

When you said you're disappointed in the tune, was it disappointment in dyno numbers or how the car felt afterwards compared to your prior self tune?

 

No #'s werent the issue! I went in w/ 350 330 ish (stock BCS w/ #65 pill)and left w/ 330 340 ish. (GM BCS)

My issues were dicrepencies in the ROM. Check out my "dynos and Knock" thread. I decided to post it up there...

Please edit the last comment and take that out! Your right, but still! not trying to bash any1, Im just just trying learn as much as possible to get my car on the "fast track", so to speak...

thanks

 

I took it out but you need to edit it out of the quote that you posted.

 

Consistency is key, not just the peak power #'s. Your knock issue might have been a slighlty over-aggressive tune and he just kicked back the timing a bit to keep the knock from raising its ugly head and killing your powerband.

When you say you 'went in with 350whp, do you mean your baseline pull that DAY at his shop was 350whp? Just curious. I assume this is a dynojet by the numbers and your mods, if its a DD or mustang you shouldn't be complaining too much lol. Also, the DJ's don't necessarily follow the same load curve as a street pull does (this is why people like the mustangs because they simulate road conditions rather well) so maybe you are running less timing on the street that it was seeing on the dyno?

I am surprised you didn't go see Razorlab. If I could have my Evo teleported to Cali I'd have him do it.......but maybe you did?lol I dunno the SD dyno crews too well,lol.

There is no need to 'hide' posts guys. You got a tune, you have questions and concerns for the tuner...big deal. That happens when you get some street time with a dyno tune. Not like you're bashing anyone.

 

Yes I did a baseline @ the shop. (Dynojet) I knew I would have to tweak the BDEL a bit, and I did... I dont have any probs w/ the #'s, although I was expecting a lil better, but hey, not really concerned about that!

He lowered my timing throughout the whole powerband. quite a bit. I was seeing 13* @ 7500 now Im seeing *8 @ 7500.

I wish I lived closer to GST, I would love to let Bryan perform his magic, but thats over an 8 hour drive.... one way!

I dont feel the need to hide my posts, but dont wanna come off as bashing any1, or any of that, just trying to get some answers from knowledgeable people.

I dont think he kicked back any timing, it was knocking on the dyno, but said it will be knock free on the street, not the case, but didnt make any changes when we got back either...

 

thank you! I did...

 

Thats definitely low but 13* is certainly too much for 91 octane IMO but it all depends on how well that FMIC is doing its job and what psi you are seeing up top.

Psh...worth it.


Yeah, thats common If its knocking heavily on the dyno, why would the street make it any better? What is your ignition timing at peak load/boost and what was your AFR dialed in at?

 

From what I have heard/read... You are right about it being worth it. If it were only that easy... I think the cooler is definitely doing its job! Its the reason Im able to hit 26 psi and no more than 2 counts... Minus the low timing... I was at 2* at peak and 11* @ 7500 and I tried to advance it up to 2* throughout after the intercooler/HFC/LICP install... @ 13* @ 7500 it would knock more than occasional (up top), but not every pull.... I think I read that Bryan said that most evo IX's like to see 3 - 5* @ peak and 11-13* @ redline. But Im assuming this is w/ 22-24 psi. I think 11 was the magic #!
Right now Im seeing 4* @ 3000, 3* @ 3500,(25-26psi) 3* @ 4000, 5* @ 4500, 5* @ 5000, 5* @ 5500, 6* @ 6000, 6* @ 6500, 6* @ 7000, and 8* @ 7500/7* @ 7400. (19-20psi) Timing is way low, but I need to lower my boost to around 23-24 (which is where I was assuming he was going when he asked me if I was ready to lower my boost)
AFR was 13.1 @ 2500, 11.9 @ 3000, 11.3 @ 3500, 11.2 @ 4000, 11.1 @ 4500, 10.9 @ 5000, 11.1 @ 5500, 11.1 @ 6000, 10.8 @ 6500, 11.1 @ 7000, and 11.0 @ 7500. I think AFR should be 12.5 @ 3000, and 11.7 @ peak (from what I have read) I brought the AFR to 11.7 @ peak (3500) and 11.3 till 6500, and left the rest of the map. I left the rich spot @ 3000 till I can confirm this is where its supposed to be. Im pretty sure I read that it should be @ 12.5 @ 3000!

I didnt actually believe him when he was telling me about it knocking on the dyno, but who am I to tell him differently, (anything is possible), just not likely. When I disagree w/ some1, I have a tendency to affend the other person, so I was on my best behavior, thinking hen would finish it up when we got back from the street run... I have been trying to find a shop I can call Home/"the shop" I go to, but unfortuneatley, I havet had the best experiences...

 

I told you to keep the stock BCS and pill, but you do not listen to me. So you lost 20 hp and gained 10 ft-lbs and got you harness spliced and a non-OEM part sitting in the engine bay for the dealer to see when/if you take your car for warranty work. That does not sound like a good deal to me.

 

The GM would be the last thing I would blame for that.

 

lol thanx for the input once again nj... after a couple hours the this morning Im back to 358/ 340. and still a work in progress...

 

+1. If the GM 3 port is doing its job (which it is) why blame it? The tuner was just being conservative I think. Seems like you've dialed in yout timing again. AFR's seem fine for 91 IMO. I personally run the same AFR from peak boost to redline.

 

Was timing the only thing you changed to fix the problem? Do you still notice the drop in torque that you experienced before since the pcv valve was not the problem?

What's the boost response like with the gm bcs as compared to the stock bcs with boost pill? Does your turbo spool faster?

 

From my own experience (and just my own here) I have noticed slightly slower spoolup only because I find that I have to make my Base WGDC table ramp up a little more gradually to prevent overshooting my target LOAD. However, this may not be as much of an issue with the PSI based boost control that a lot more people are using with the JDM map sensor. My 'seat of the pants' testing doesn't really notice any real difference in spoolup though, only from my logs can I see that its slightly slower in my case.

 

+1

I came from Aem TruBoost controller, now using PSI based control. Over all I am very happy with PSI based control. The car does feel sluggish to get to peak boost. It almost feels like the car doesn't have any torque. You can look at the DLL link in my sig to see the curves.

I have tried tweaking the wgdc some, but as you stated, getting quicker spoolup results in over shoot, especially in higher gears. I have returned it to where my good buddy set it at! (Thanks you know who you are on here)