artguy

hi

I just got done breaking in my motor and have been trying to do some tuning so that I can run decent boost. right now I am able to adjust boost from 5-9 lbs but not over nine lbs.

the second symptom is that boost takes a while to build...I am not getting the secondary kick at 4500 rpms and instead get full boost at about 5500-6k rpms and up.

It feels very laggy at the moment.

at first I thought it was a prob with the pwer fc controlling boost. It does not seem to be the case.

all solonoids and actuators have been checked or are brand new. no lines are crossed or hooked incorrectly to my knowledge.

anyone else have this happen...what is my solution?

I have dyno tuning on monday and cannot miss the appt...any input is appreciated.


thanks

jason manley

ps..mod list is in the sig.

artguy

I tried changing those numbers...no matter what my max is .79 bar

here is what Im getting in some quick runs in second gear

idle .... negative .335 bar
3500rpm- .52
4000rpm- .75
4500rpm change drops to .50 bar
5000rpm- .67
6000rpm- .77
redline- .75

I did a few runs and the above numbers were about the average of the runs. I tried adjusting the duty cycles and the boost levels as specified above and got no changes after it hits the peak of .79 bar.

I can see the change in boost at 4500 rpms but it does not have any kick like the second turbo is boosting....

M2 claims that I need to boost more than the stock required 8lbs for the secondary to spoolup and kick in.

why is this happening?



I love this car..hahahahahah.

j

rpm_pwr

Assuming you're running a stock twins setup - either:

You have a major boost leak. Given your numbers, you should hear it though. If it's dumping to open space you may only notice that your turbo(s) sound louder. The last time I had these numbers I found an IC hose was popping off under heavy load (engine twist) and then popping back on!

or

Your pre-control/wastegate control setup is on the blink. First disable the pre-control. I cant remember if it's N/O or N/C off the top of my head though. So I'd recommend you block off the pre-control pressure lines (bolt and hose clamp style)

Then go for a run. Now the wastegate control is getting full pressure (not shared). Be careful though because if you do have the solenoid connectors crossed over you can seriously overboost here so find a steep long hill and _slowly_ increase boost. If you comfortably get desired boost, make sure you can control the boost level. This proves it's your pre-control. If you get uncontrollable boost your connectors are back to front. If you still get low boost:

check
* charge control (FSM test)
* charge releif (should be CLOSED at idle)
* turbo control (use pump/1-way valve to move it)
* pressure chamber (boost then pop-off hose)

But I doubt it's either of them. It really would have to be a boost leak. A number of places can can have these symptoms:

a) Y-pipe (you normally hear this though)
b) IC pipiing (may not hear this)
c) y-pipe -> BOV hose (fails easily)
d) y-pipe -> charge releif (often splits on engine side)

that should get you started

-pete

artguy

thanks pete.

Ill check all these things....

I fixed the small leak I found....still absolutely no difference in max boost.

my charge releif valve is brand new...and seems to be functioning properly.

as for the others...I shall find out.

Ill post the results as soon as I know.

any other input is appreciated.

j

artguy

ran it today...blocked off the precontrol...ran it to atmosphere....max boost ran up to fourteen lbs.....but boost did not come on until 5500 rpms plus....HOWEVER..it should have boosted twenty plus lbs setup like that...why is this?

will be doing a tear down tomorrow.

m2(where I got my turbos)...and xs (ecu purchase thru the store) both shops claim that it is a control issue....but all my solonoids are new and were checked...everything looks hooked up correct...

double checking first thing in the morning.


any input on this is appreciated.

kwikrx7

Hey artguy, guess it's time to go non-seq. - I'm telling you, you'd have a major power advantage and no problems like you're having now - running those M2s parallel would be stronger than a RX6 and with a streetport and all the bolt-ons you'd have full boost by 3000 -3200 rpms - I'll talk you into it one day

artguy

nice try barry...believe me..Ive had this conversation with myself about three times this week....but I cant handle lag. Matter of fact I HATE LAG...even if the gains are significant.

regardless...here is the update

the boost problem I had stemmed from the actuator that controls the boost...it was stuck and seems to be damaged...though upon inspection it seemed ok...sometimes it sticks..sometimes it doesnt....am replacing it tomorrow....

the car runs much better today...was able to boost a full fourteen lbs for test runs....when the turbos come on full the car pulls and pulls...after transition they pull like a ****** fu...oh never mind.

the car should hit the dyno this week....its running so rich that the exhaust burns my eyes....its also running slow still....probably as fast as a stock fd.....I should be about a hundred and twenty horses in mods past that so I expect miracles tomorrow and thursday on the dyno.

j

my current boost pattern in second gear is something like this...

3k 12lbs
4k 14lbs
transition 5lbs
and on up to full boost


I blame the probs on the acutator...and can feel lag on ocasions...all other hoses and acutators and solonoids are perfect.


thanks for all the help guys. totally appreciated...and totally worth the time.