Boost fade/spike/problems

[staztrx250]

well I'm having some problem with the boost I've uploaded my ECMlink log file. If you look at the boost est( which is spot on with my gauge) you'll see my problem. Is this normal for the stock turbo.

Keep in mind I'm running e85 and let me know what you think about the tune as well.

 

[LiquidX]

I don't know anything about tuning yet, but your boost is dropping a little early in some cases and I would suggest doing a boost leak test. On you WOT pull, that seems a little more normal as the T25 will run out of breath but to loose boost that fast and by that much seems to show a leak.

 

[MJBean420]

Had a similar problem and I had a little leak at the exhaust manifold.

 

[gofer]

Thats a typical T25 for ya, those things fall on their face fast and all the way to redline. Your tune on the sliders looks funny, you should get your AFR's and timing close using your DA maps and then do the fine tuning using the sliders.
Do a BLT and listen for exhaust leaks pre turbo... they call it a T-to small for a reason man, now you see why huh?

 

[staztrx250]

Thats a typical T25 for ya, those things fall on their face fast and all the way to redline. Your tune on the sliders looks funny, you should get your AFR's and timing close using your DA maps and then do the fine tuning using the sliders.
Do a BLT and listen for exhaust leaks pre turbo... they call it a T-to small for a reason man, now you see why huh?

T-to small never heard that b4... Don't worry a 16g is in the works. My Da maps? What exactly are those and how do i adjust them?

Could you send me a log from your car I want something to compare mine too?

Thanks


Edit: okay I put the DA together part together Direct access but what maps do i adjust? Where do I start?

 

[gofer]

Start here...
Basic Tuning How-To

The two tables you play with in DA are the OpenLoopMaxOct & TmngMaxOct and go through them in your log like it shows in the demo and make changes there. Zero your fuel/timing sliders first, then do a pull and make the big changes using DA then the tweak and peak stuff over on the sliders.
You'll also want to make it a SMOOTH transition from zero in those sliders, I noticed your 500rpm fuel slider is already at -10.9%.

 

[staztrx250]

Alright here is take two as far as the tune goes, check it out and let me know.

Also I put a new bov on greddy type-s it seems to hold boost better.

I'm going to be doing a BLT soon.

Also I think I might just be over running my stock exhaust; so I'm looking into a new set up. I already know what muffler I'm going with (Vibrant Performance ::.) but does anyone know where I can get cheap piping already bent to fit?

 

[gofer]

There are a few things that definitely stand out in your log, thats great your new bov holds boost better I guess I didn't realize you were still on the stocker 2g one. I'm unsure why your tuning for a 13.0 ~ 13.2:1 AFR, THATS EXTREMELY LEAN FOR WOT on pump gas. You want to tune for a 11.2:1 AFR at WOT, its a good thing your still running the t25 at low boost levels or you might not have a working motor anymore.

I completely redid your DA tune, click the link and walk out to your car and save it to your ECU.
staztrx250 t25 retuned DA maps.eda

On top of running extremely lean at WOT you also have no need to setup your "anti-lag" running the t25, I have a bigger turbo and don't need to run anti-lag. Anti-lag is used to spool big turbo's off the line so theres no "lag." It also wouldn't hurt to select the button to turn on your fans full time in the "Misc" tab since your coolant temps are around 203-206*.

I'd turn up the boost to 17psi and do a 3rd gear pull from 3k to 7k with the DA maps I created then post the log. Watch you boost gauge around 5.5k and remember the number, then check your log and see what your boostest is at 5.5k because it should match what the gauge read.



EDIT
DANG. I just realized your running E85, I didn't think your AFR's made sense... I guess I wasted a few smoothing your DA out huh? haha. Standby for a bit and I'll get a good E85 DA fuel/timing map spun up for you, SORRY!

 

[staztrx250]

There are a few things that definitely stand out in your log, thats great your new bov holds boost better I guess I didn't realize you were still on the stocker 2g one. I'm unsure why your tuning for a 13.0 ~ 13.2:1 AFR, THATS EXTREMELY LEAN FOR WOT on pump gas. You want to tune for a 11.2:1 AFR at WOT, its a good thing your still running the t25 at low boost levels or you might not have a working motor anymore.

I completely redid your DA tune, click the link and walk out to your car and save it to your ECU.
staztrx250 t25 retuned DA maps.eda

I'm sorry i forgot to mention some stuff i'm running E85 and i had a crushed 1g in there b4 but that still couldn't hold like the greddy does. I know 13's are a little on lean side for e85 i was shooting for mid to high 12's. i'll update my profile so people don't get confused


edit: for the record it did say e85 at the top of the thread, but it's still my fault for not having it in my profile sorry again

I'd turn up the boost to 17psi and do a 3rd gear pull from 3k to 7k with the DA maps I created then post the log. Watch you boost gauge around 5.5k and remember the number, then check your log and see what your boostest is at 5.5k because it should match what the gauge read.!

now when you say 17 psi, right now i'm around 16 psi i but i spike almost 20 right when the turbo hits and then holds 16 b4 it dies off. so idk if i wanna turn it up until i get a new exhaust. which i think is cause my boost spikes. Also the boost est is close within a psi or 2 but i don't wanna mess with with the maf comp any more til i do a BLT.

 

[gofer]

If your spiking to 20psi then you are correct, leave the boost alone until you get an exhaust on there. I made more changes in your DA then just fuel/timing, I also updated your airflow smoothing and LTFT as well. Play with the fuel and timing DA maps to read 12.3:1 rich and smooth it out to the 14.7:1 stoich.

 

[staztrx250]

If your spiking to 20psi then you are correct, leave the boost alone until you get an exhaust on there. I made more changes in your DA then just fuel/timing, I also updated your airflow smoothing and LTFT as well. Play with the fuel and timing DA maps to read 12.3:1 rich and smooth it out to the 14.7:1 stoich.

where's it at?

 

[gofer]

Alright... I redid your DA OpenLoopMaxOctane table for E85 rather than pump gas like I had done originally. Just copy and paste it into your OpenLoopMinOctane table so they match and use the sliders to fine tune your fuel/timing at WOT since thats the only time the sliders are applied to the tune. The DA maps are conservative but always being applied when the car goes into open loop, the sliders are what you'll want to use to bring in your AFR's to perfect at WOT. The car should drive very smooth at partial throttle too, no bucking or hesitation if you don't have boost leaks...

Heres your new tune ---->E85/t25 staztrx250 DA settings

Just click the above link and it will open up in ecmlink, then walkout to your car and apply the settings with the key in the "ON" position but the car off. After "0" your fuel and timing sliders and go do a WOT pull in 3rd gear from 2.5k to 7k and post the new log.

 

[staztrx250]

Thanks for the maps! I up loaded the maps and made a few adjustments. Here's a pull I did. Its the last one I had time for today I noticed a couple things wrong. First off my TPS is wrong off by 3%. I'll touch that up. I'm also unsure about the A/F at 3000 rpm's should I try to richen that up or leave it. Its also the first pull i had any knock I don't think it will show up again.

 

[gofer]

Looking good there big guy! Did you notice a difference in the way the turbo spooled up or how hard the car pulled? That knock is very minimal and nothing to be concerned about, your AFR's are good right there and timing isn't crazy either. If it were me I'd do another log at WOT without changing a thing and see if knock shows back up at 3.7k again. If it does, using your timing sliders pull a degree at 3.5k and 4.0k and do another pull. Post up a log of you doing the same WOT 3rd gear pull you just did, only making changes to your TPS adjustments.

 

[staztrx250]

Well i just went back out and took that lump out of A/F. This is what i got this time. and the knock didn't show up at all. there is two pulls the first one I had to get out early because I thought I saw a cop at the end my tuning road.

 

[gofer]

Since everything looks good leave the tune alone until you get that catback exhaust, then kiss that boost spike goodbye. After you get rid of the boost spike get the boost to hit to 17psi and stay there, then we'll start advancing your timing.
Your doing your 3rd WOT pulls on an enclosed course for tuning purposes Hows the car feel on the butt dyno?

 

[staztrx250]

Looking good there big guy! Did you notice a difference in the way the turbo spooled up or how hard the car pulled? That knock is very minimal and nothing to be concerned about, your AFR's are good right there and timing isn't crazy either. If it were me I'd do another log at WOT without changing a thing and see if knock shows back up at 3.7k again. If it does, using your timing sliders pull a degree at 3.5k and 4.0k and do another pull. Post up a log of you doing the same WOT 3rd gear pull you just did, only making changes to your TPS adjustments.

yeah it made a huge difference... according to the HP and Torque est. Which i have no idea how accurate they are. Regardless It made 280 ft-lbs and 245hp with the original tune on e85. this last pull claims 345 ft-lbs and 270hp. So regardless of the accuracy it made a huge improvement. It defiantly pulls harder and the turbo hits way harder. The car also runs a lot smoother under dd condition as well the transitions into the power are alot cleaner. Thanks again for the help man

 

[gofer]

Always glad to help!