spiked to 25psi today

[TWOptSL0W]

i have a 3076r and tuned to 20 lbs. if im doing a normal pull, it builds to 20 then holds great. today i was doing about 60 and dropped into 4th and punched it and i immediately spiked to 25 (i was watching my boost gauge to see how boost was building). hit all the fuel and boost cut shit and car is fine but im wondering why it might do this. im leaning toward something with either the iwg not being able to handle it or possibly my wgdc being messed up (stock solenoid). it is just strange because it only happens if i shift into gear at a higher rpm.

ideas anyone?

[rfinkle2]

Originally Posted by TWOptSL0W i have a 3076r and tuned to 20 lbs. if im doing a normal pull, it builds to 20 then holds great. today i was doing about 60 and dropped into 4th and punched it and i immediately spiked to 25 (i was watching my boost gauge to see how boost was building). hit all the fuel and boost cut shit and car is fine but im wondering why it might do this. im leaning toward something with either the iwg not being able to handle it or possibly my wgdc being messed up (stock solenoid). it is just strange because it only happens if i shift into gear at a higher rpm. ideas anyone?

I hate to have you do it again, but if you can catch a log... that would be great.

[manelscout4life]

just tune to 25 psi. then it wont be a spike

[rfinkle2]

Edit.. You don't even have to let it hit 25 psi, but just log what the wgdc is doing when this happens vs. your wgdc table and wgdc boost error comp table.

I'm tempted to say to lower your wgdc boost ramp limit high to 5, but my guess is an overly aggressive wgdc boost error comp table.

[JacksonMS30]

Are you using an MBC or the stock bcs?

[TWOptSL0W]

well since im still on the solenoid, im pretty much maxing it out while im hitting the 20psi doing a normal pull. heres a log that i did recently (i think i have a slight boost leak because i dont think it should be maxed out yet, but that is constant throughout the log and the 25 spike so it shouldnt make a difference)


id also prefer not to do it again unless i have to. my map sensor wouldnt be able to give an accurate reading anyway since its the 2.5bar

[TWOptSL0W]

Originally Posted by JacksonMS30 Are you using an MBC or the stock bcs?

stocker. i think that *may* be my problem, but just trying ti figure it out

Originally Posted by rfinkle2 Edit.. You don't even have to let it hit 25 psi, but just log what the wgdc is doing when this happens vs. your wgdc table and wgdc boost error comp table. I'm tempted to say to lower your wgdc boost ramp limit high to 5, but my guess is an overly aggressive wgdc boost error comp table.

it spiked within a second of shifting gears. i took my foot off as soon as it shot up, but i dont think id be able to get it before it shoots up

[rfinkle2]

So you are still running some wgdc throughout the entire rev band?

[JacksonMS30]

Originally Posted by TWOptSL0W stocker. i think that *may* be my problem, but just trying ti figure it out

Why are you still using the stocker? You could get an MBC for less than $100 or you could get an EBCS for right at $100. The grimspeed EBCS is only $110 I think.

I'm just curious if you have a reason for sticking with the stocker...

[TWOptSL0W]

not the entire thing, but its pretty much maxed till 5k then tapers down very quickly. the stock is crap to work with for a bt, but im testing it to see if its possible for any other guys who may want to do it

edit: ill prob end up with a gs ebc eventually but i wanna see if this one can work and give a good base wgdc for some peeps

[JacksonMS30]

gotcha

[rfinkle2]

Originally Posted by TWOptSL0W not the entire thing, but its pretty much maxed till 5k then tapers down very quickly. the stock is crap to work with for a bt, but im testing it to see if its possible for any other guys who may want to do it edit: ill prob end up with a gs ebc eventually but i wanna see if this one can work and give a good base wgdc for some peeps

You might give the wgdc ramp limiter high (set to 5 vs 10) a try and almost completely wipe wgdc out @ towards redline.

[TWOptSL0W]

so basically that would let the solenoid work at a slower rate? im sorry im not 100% familiar with the new wastegate tables. also, im a little confused as to why it happens when i shift to 4th in a higher rpm vs a wot log run where wgdc was maxed anyway

[rfinkle2]

Originally Posted by TWOptSL0W so basically that would let the solenoid work at a slower rate? im sorry im not 100% familiar with the new wastegate tables. also, im a little confused as to why it happens when i shift to 4th in a higher rpm vs a wot log run where wgdc was maxed anyway

The wgdc boost error comp table is much like the old boost dynamics table.

Now that I think about it, it would be more beneficial to pump up you wgdc boost error comp overboost portion of your table.

The ramp limiter limits the amount of continuously multiplied correction the wgdc comp table can make to the wgdc table.

[TWOptSL0W]

would the ecu be able to compensate that quickly and the changes in wgdc work fast enough? it was literally milliseconds

[rigor]

i spiked 25 today also

[TWOptSL0W]

yea well im not supposed to

[themytb]

I may be wrong here but I think when you downshift the ecu is moving faster than the spool, so the ecu reads rpm/throttle boost target, sees that its under target and adds boost error to the mix, ramping the wgdc higher than is actually needed and causing a spike. If i'm wrong I apologise for my newbness.

[rfinkle2]

Originally Posted by TWOptSL0W would the ecu be able to compensate that quickly and the changes in wgdc work fast enough? it was literally milliseconds

The ecu is pretty fast...I think,"is your bcs fast enough?" is the question.

I would try taking the stock overboost portion of the wgdc boost error comp table and multiply it by 1.5.

You could also introduce a small wgdc load error comp table to control load and hybrid tune as Fobio and Bluestreak call it.

[rodrigo]

tune it to 25psi , problem solved

stop being a pussy...if i can run 25 psi on a 71 u sure as shit can do it on a 76

[TWOptSL0W]

i would rodrigo, but still on stock map sensor and ill change that out eventually but not now

[rodrigo]

NIGGAH IM ON THE STOCK MAP SENSOR TOO.....oops caps.


i just set all the cuts to like 40psi hahahahahahah


man fuck safety....its like fucking with a condom...sure the bitch can get pregnant, sure u can catch some bad shit....but we all know which way is more fun

[TWOptSL0W]

nah ill stick with being a puss and figure this out

[SSinstaller]

I think your first step needs to be a boost leak test. You have a .55AR turbine 3076 and your spooling slower than my T3 gt35.

What does your WGDC table look like?

This is mine. I'm targeting 23psi, I hit 24.5 and immediately drop into the 23's all the way to redline.. Max WG boost dynamics is 15%. the 100% cells start the spool, the 90% forces the WG dynamics adjustment up as I haven't hit my target yet, the 30% cell prevents any significant spike, and the 40~41 cells hold me at my target, and ensure that downshifting and going WOT doesn't cause a massive boost spike..

100.00	100.00	100.00	100.00	100.00	100.00	100.00	90.00	30.00	40.00	40.00	40.00	41.00	41.00	41.00

The OEM BCS setup is junk--your forcing yourself to use high base WGDC values to hit your target boost, but that will cause the spikes your seeing. A good EBCS will allow you to run high WGDC to spool as fast as possible, but use much lower WCDG values and the WG dynamics to maintain once you hit your target..

[TWOptSL0W]

my wgdc is 80 until 3k then 100 till 5k then tapers off quick. i know the stock sucks but do you think thats whats holding me back? would a new ebc make that much of a difference? my boost leak is pretty minimal and small enough where it wont affect my spool at all if anything

[Bucker]

Originally Posted by TWOptSL0W my wgdc is 80 until 3k then 100 till 5k then tapers off quick. i know the stock sucks but do you think thats whats holding me back? would a new ebc make that much of a difference? my boost leak is pretty minimal and small enough where it wont affect my spool at all if anything

yes. The EBCS is holding you back.

[TWOptSL0W]

fine wheres the cheapest place to get a grimmspeed? hopefully that will be able to react faster and help with this overboost business

[vrspeed10]

I second that.. Its got to be the bcs. I had a ds ebc in my msp and until i installed it that bitch would spike like crazy all the time. After i installed it the boost came on quick, hit set boost and would hold like a champ..

[G26]

Originally Posted by themytb I may be wrong here but I think when you downshift the ecu is moving faster than the spool, so the ecu reads rpm/throttle boost target, sees that its under target and adds boost error to the mix, ramping the wgdc higher than is actually needed and causing a spike. If i'm wrong I apologise for my newbness.

Exactly what is happening. I spike to 19 psi usually when I punch it above 3000 rpm.

[Bucker]

Originally Posted by G26 Exactly what is happening. I spike to 19 psi usually when I punch it above 3000 rpm.

i don't know what I spike to... Ap only fucking logs up to 22.63. @Cobb Tuning

[Nitr0EngiE]

i get that kind of issue with electronic boost controlling. it could not open wg fast enough and if you have internal wg that does not help. get rid of boost controller and put a 20psi spring in your wastegate if you got external problem solved =p

[rigor]

internal wg ftl on that deal me thinks, but not 100% sure

may have to deal with it or go ewg

or turn it up to 26 then your good 20 psi sucks anyway on this size turbo

tune better be on though gl

[JacksonMS30]

GrimmSpeed EBCS

GrimmSpeed

[TWOptSL0W]

Yea I know them but is there a vendor that sells them any cheaper? Not being cheap I'm just not trying to spend money uselessly

[SSinstaller]

How is your OEM BCS connected? You should not need 100% WGDC above 3500psi--you should be hitting your 20psi around 4K..

Post your WGDC table, your boost error comp table, and your boost error ramp high limiter... and a third gear log, and we'll see if we can make it any better with you having to spend any money..

[TWOptSL0W]

oem bcs is basically t'd off from my boost source and iwg. i got a quick log today and ill post up my map so you can take a look that way. today it spiked to 25+ within an extremely short time. i have a hunch that my iwg may be actually stuck closed (see ATP 1 Bar iwg turbos )

i have an insane weekend coming up including me driving to georgia (from nj) tomorrow for a funeral monday and then back again in time for work here again on tuesday ( i may just not sleep for 3 days) so i wont be able to check it till tuesday or wednesday

[manelscout4life]

being t'd off of the bov causes a delay to the bc

[TWOptSL0W]

It's not off the bov. My boost source is directly after the turbo

[SSinstaller]

Originally Posted by TWOptSL0W oem bcs is basically t'd off from my boost source and iwg. i got a quick log today and ill post up my map so you can take a look that way. today it spiked to 25+ within an extremely short time. i have a hunch that my iwg may be actually stuck closed (see ATP 1 Bar iwg turbos ) i have an insane weekend coming up including me driving to georgia (from nj) tomorrow for a funeral monday and then back again in time for work here again on tuesday ( i may just not sleep for 3 days) so i wont be able to check it till tuesday or wednesday

I've got the MS6 ATR, so I can't open your map. Could someone who has a 3 please post the info I asked for from the map.

Looking at your log you should only need 100% WGDC to 3000rpm~3500rpm, every value after that should be significantly lower...

If you get a chance drop all your WGDC targets by 40% above 3500rpm, and take a new third gear log, make sure to go WOT at 2900~3000rpm. It doesn't matter if you don't hit your target, you just need to be able to make a full pull..

[rfinkle2]

I would post those tables for sure, but I'm @ work, with no ATR.

If it isn't posted by the time I get home, I'll post the tables up then.