Brettus

iTrader: (2)

Have you got a check valve on your air injection hose ?
And sorry for the stupid question ... If so is it the right way around ?

Kane

iTrader: (1)

Spun turbo means that it's toast - the impeller is hitting the housing or shaft etc... it would prevent you from going into boost.... but most people can hear it well.

The worst I have seen was a spun MS6 turbo keeping the car from making more than 1 psi - and it caused it to overheat with a quickness.

NgoRX8

iTrader: (1)

The hoses from the accordion tube? I have the jet air hose plumbed right before the throttle body and the omp hose before the turbo. no check valves.

Brettus

iTrader: (2)

OK just checkin

Brettus

iTrader: (2)

something else to try .
Disconnect the ssv vac line (and plug) then do a log of maf and boost

boost pressure should go up a little and maf down a lot

NgoRX8

iTrader: (1)

Alright, did a pressure test, wasn't a great one, but I didn't find any leaks. I was hearing a ticking noise when I pressurized it (doing it from the intake), seemed to be from the turbo (or somewhere around it) and I could hear the ticking slow down when I stopped pressurizing. Not sure if that means anything. I did the test open system though, I will try a closed system once I fab up a better pressure cap.

Done for today. I'll try pulling the ssv tomorrow.

Thanks guys! If anything today was at least pretty productive.

Brettus

iTrader: (2)

that dyno run you posted - was there an AFR log with that as well ? Please post if so .

You have not mentioned what is happening with AFRs - if you had a major boost leak you should be running very rich - is that happening ?


Also , can you explain how you are doing the leak test . Does it incorperate the intake manifold ?

NgoRX8

iTrader: (1)

here is the dyno run with afr. The lowest AFR during the run was 11.25, using the dyno shop's wideband.



This was being run by MazdaManiac on the dyno and he did not hear a boost leak. At least nothing that would cause this big a drop. The car went through 47 pulls, most of them showing a similar boost curve. Also, when I first started my calibration a LONG time ago, I bugged him about my tune running Lean. When it was actually normal because the boost dropping off.

I leak tested it with the intake manifold, yes. It was an open system so air was escaping through the engine. I capped it off on the intake side and pressurized it from there. So I was only listening, feeling around, and spraying soap water onto couplers. I will test it closed with just the piping next time.

NgoRX8

iTrader: (1)

I did a couple runs with the ssv disconnected and capped off. My boost controller logged in smaller increments than the AP so I expanded the data of the MAF and RPM linearly.



However, this was a 2nd gear run on an incline versus the 4th gear on the dyno. The boost did go up as I hit a peak of 9 psi (9.3 on another run), when on the runs yesterday I could only hit mid 8s. I guess it would be wise to log 2nd gear WOT incline run with the ssv connected to compare the maf and boost curve.

Brettus

iTrader: (2)

wow - interesting that the boost fluctuation dissappeared - or is that because your logger is not fine enough ?

BTW - i prefer 3rd gear logs due to 2nd gear going by too quickly and 4th gear being too fast (speedwise) .....




Just thinking aloud here ....

Your mass airflow seems to be too high (by about 10%) for the boost/whp you are making which indicates a leak BUT maf calibration can have a big impact on that and your comment about going lean because of lower boost plus the fact that your afrs don't seem to be out of whack has me wondering whether there is a leak or not .....

The ssv valve test shows exactly what I expected it to do (about 50 g/s maf reduction at almost identical boost which also makes me doubt the boost leak theory .

Did you ever get that photo of the wastegate setup - does it work the same way as the greddy ?

I'm wondering if the boost and maf fluctuations are just throwing us off the scent and it's all to do with the wastegate getting blown open . Compare your dyno and boost profile with an early one I did (blue line) - almost identical boost profile and whp .........

This dyno was done before I figured out how to adjust the wastegate arm and seems to be what anyone with a Greddy based system has to deal with . I can almost hear MM and Kane rattling their sabres as we have had arguments over this before LOL

Kane

iTrader: (1)

Not the problem... the fix.


Either way - it could be the WG potentially.

Looking at your WG signal line removal findings, I would say to test the freeplay in the WG connector and then try moving it with your hand to see if you can manually open it easily, it should require a lot of strength to crack it.

Brettus

iTrader: (2)

True dat . And I still say the fix works - bloody well

how does 10psi +/- .3 psi - all the way to the redline sound (aux ports closed)

Kane

iTrader: (1)

Physics is for pussies!!!!!

NgoRX8

iTrader: (1)

I definitely thought it was a wastegate problem for the longest time. However, using a 10 psi spring, I don't quite understand how it would be 'blowing open' with the wastegate signal disconnected. I may need to test the cracking and fully open pressure again. I will take a picture tomorrow when I do my oil change.

I really wish I could watch the wastegate/actuator during a run to see what its doing. lol

For kicks, here is a run I just did in 2nd gear WOT with ssv connected to compare with my previous run.



Boost fluctuation seems to not show on this run as well. So either my boost controller is unable to read those fluctuations or 2nd gear flies by way too fast for those fluctuations to appear. I'm tempted to say its because of 2nd gear.

The boost profile looks very similar and having the ssv definitely gave it a little more boost up top.

Airflow definitely shows a major difference than the run I did earlier. 36 g/s more at the same point even with a lower psi.

BTW, Thanks for all your help Brettus!

Kane

iTrader: (1)

Freeplay, cracking pressure and fully open pressure should be tested.

Even if the the spring is right - a leaky wastegate can cause all kind of boost related drama - freeplay can lead to slow boost threshold and boost taper, blowing open the WG actuator can obviously cause boost fall of.

NgoRX8

iTrader: (1)

I've tried, and its definitely not easy. I have to work it a little to get the actuator rod onto the flapper. Mazdamaniac also considered it back at the dyno day and checked it. It's tightened a good 7 full rotations from being slipped on. It is a HKS 10 PSI Actuator.

Thanks Kane!

Brettus

iTrader: (2)

I'm gunna say - wg blowing open is your issue - even with the 10psi actuator .

Do you have any more adjustment in the wg actuator arm ?

Kane - I know you don't like what I'm going to suggest but lets just try it and see if it does anything then debate whether it is the right fix later .

NgoRX8

iTrader: (1)

I have about a 1.5 turn adjustment left in it. Then I would have to resort to shortening the threads on the actuator to allow more.

Brettus

iTrader: (2)

Do EEEET ! LOL

looking at your MAF log from the last run shows 330 g/s which is actually getting up there so you need to take this one step at a time to avoid going too far .

Kane

iTrader: (1)

Well - if the spring is good then your tension should be fine.

You may need a bigger WG diaphragm - for now though you can mess with Brettus' suggestion - to see even though it is technically wrong; LOL.

rotarenvy

hows your compression on the rotors?

Brettus

iTrader: (2)

and we all know to "choose the harder right over the easier wrong " LOL

Jedi54

iTrader: (7)

compression is good, he tested it recently.

MazdaManiac

iTrader: (3)

How novel.

Kane

iTrader: (1)

Hey now, some people paid with their life to live that motto...I hope you are not making fun of Cpt English.

I haven't seen the WG; so I can't really say definitively... I am guessing you may have said the same thing when you were tuning it....

I have one other temp fix that might work but I'd need to see a picture of the waste gate to see.

If someone wants to post a detailed picture of the wg actuator that would be swell!