NefMoto

So i modified my stock file for a little more boost and advanced the timing just a bit the strange thing is it will spike 21 hold for 2500rmp -3500 rpm then fall down to 11 psi i have attached some screen shots of the tables i modified i m wondering if i screwed up somewhere havent had a chance to log


02 a4 1.8t temporary car till i get the s4 up

Replaced N75
Vacuum and Boost tested whole system
Brand New f21 franken turbo
New Diverter
Pretty Much replaced everything looking close to failure

ldrxn is way to high for k03

does this table look right at all ? :'(

For what K03???

Umm yes, so what you saying requesting 1.2bar at 1000rpm is possible on a k03???

If you want to be a wise-ass, then up to you, I never even looked at what LDRXN was at 1000 RPM, I was just questioning your saying that his ldrxn is too high for a K03. Is an FT F21 a K03 to begin with?

his initial post was K03 check with the op, and even if it is a frankenturbo that requested isnt exactly sane is it? I dont know what your issue is with me but you seem to have some chip on your shoulder and searching through your posts dont actually have anything of any value to say anyway. Wise-ass I wouldnt say so but in this case I think that pertains more to you than me  ::)

Can you increase your KFMIOP axis?
You need to get that torque map under control.
The highest axis point is 145 and you are showing load of 200 in some places.
Take a look at ME7 Tuner Wizard.
http://nefariousmotorsports.com/forum/index.php?topic=1371.0title=

Post your KFLDRL.

If this post gets moving it could be re-titled and moved to the Project Car section as the 1.8T Frankturbo F21 tune.

Get ME7 logger going.  Search the board.  Mark P's template is what you want to use to diagnose your problems.

183.99   186.00   186.99   189.00   189.99   191.00   191.00   191.00   192.00   191.00   185.00   179.00   177.00   175.01   174.00   169.01


i lowered boost used masterj's tuning wizzard going to log tonight see what happens

No bueno. Way too much boost too early.

Actually you can request as much boost as you want as early as you want, but then observe how this boost is reached and then fix low rpm range if you want

I suppose, but stock LDRXN ramps up pretty agressively to begin with. Personally, I don't think there's much to be gained from too much requested load that early.

There are really only two concerns

1) Positive deviation (if you request too much too early)
2) Throttle cut, or the PID pulling WGDC during ramp (if you request too little too late)

Just a couple notes here...

I'm pretty sure 11psi is cracking pressure for those turbos, my guess is limp mode. Get some logs.

No offense to masterj or anyone else, but IMO, you can't rely on an excel workbook to tune a car for you.

Big picture stuff, when you change one value it usually will affect other things. LDRXN for example does not just affect desired load but also has influence in %MDMAX and %LDRPID via rlmax. Not relating to the OP's problem, but just something to think about.

its weird if it was limp mode wouldn't it keep it at 11 when ever trying to do a pull because when i go to the next gear or stop and go through the rpm it spikes 21 then after drops to 11 i will be logging tonight

Yes, if you are in limp it would stay at cracking pressure, unless you have a bad wg line or n75

crazy traffic out tonight this is the best i could do on my own

something seriously wrong, your actual is always way above requested and n75 duty is sitting 0% from 4000rpm onwards so you are going going into soft limp with a positive deviation. I had a friend car who did something similar and whoever worked on his car before had the wastegate pretty much tightened shut.

(http://i226.photobucket.com/albums/dd202/airtite/custom4_zps84f5af97.png)

(http://i226.photobucket.com/albums/dd202/airtite/custom4_thottle_zpsf90c2b8a.png)

crazy good progress today check out this log

it is better but you are having similar issues to what I am having on my new setup where boost spikes at 3000rpm then your throttle closes to 30percent  and wgdc is going to 0% but your boost still remains above specified boost. I am still not a 100percent sure if mine is wastegate actuator related or not but you seem to have easier access to yours which seems to have helped bring your boost closer inline so maybe try and loosen the actuator 1 or 2 more turns and lets see whats happens.

(http://i226.photobucket.com/albums/dd202/airtite/STAAAAAGEEEEE2timing_zps860e16cb.png)

Read this Mickey.

http://s4wiki.com/wiki/Throttle_cut

What's your wastegate cracking pressure? Has the turbo ever been replaced? Looks like someone has it cranked down.

I asked him to readjust the actuator yesterday which is what brought the boost down from the first log

Well, its still fucked :)

My thinking exactly. What's factory preload?

not as fucked as it was  ;D

Unplugged the n75 it looks like I am at around 9 psi wg

(http://i226.photobucket.com/albums/dd202/airtite/STAAAAAGEEEEE2timing_zps860e16cb.png)

that doesn't look like 9psi

that looks like a torn WG or busted n75

Looks like 17 to me.

I swapped out 2 n75's both brand new OEM gonna get maybe a aftermarket race one to see if anything changes the turbo has less than 500 miles

Get a pressure regulator and an external air source and verify the opening pressure. Till then, any speculation is a waste of time.

That, and race valves cause more trouble than they're worth without completely redoing the PIDS.

With the throttle HALF CLOSED no less.

It's obvious the wastegate is cranked down and not opening. Another case of trying to tune around hardware problems.

Good ol Frankenturbo wastegates.

It never ceases to amaze me that people don't verify the preload and check for interference before installation. It's so easy to do before assembly, but once the turbo(s) are/is in, it's a real PITA.

(Not directed at you Mickey, just 1,000 other people have done the same thing)

could you explain? I have no experience with the frankenturbos but would love to know what wastegate issues they have?

I wouldn't say it's specific to FT's, just these issues constantly pop up after aftermarket turbos are installed without checking wastegate preload or verifying the actuator can move without interference. There are 10 page threads on AZ dealing with the same thing before the people who told the OP to check the goddamn wastegates are vindicated.

The moral of this story is NEVER leave something like this to chance. Check,and recheck before attempting to tune anything.

just talked to the previous owner he never checked it due to the turbo coming with a inspection sheet saying 8psi figures lol

QFT

did you manage to sort this out?

Ran a pressure regulator to the wastegate of both of my cars both have f21's (a4 & s4) and the waste gates on both started opening around 15-17 psi should have both set to 10 psi this week been crazy busy at the shop