Yeah...bit p!$$ed off doesn't describe it...

 

Mmmm... I would question those boost figures for sure. The 1.8bar peak I could understand, but that is not needed for that turbo. 1.6/1.5 at the top end... no chance imo. These turbo's will be flat knacker at much over 1.4bar at 7k.

Those boost figures you state are even more questionable with the power you achieve.

You on normal pump fuel?

For information mine is running 1.7bar peak and 1.3bar at the top end. Nigh on 400bhp and 385lfbt (520nm).

 

I'm running normal pump fuel, 98 RON, obviously it is not 98 Optimax, but definitely not the worst fuel out there. Will go on another dyno today if lucky.

Also, do you guys by any chance have 800cc Ecutek latency settings etc. cause I have somehow misplaced the piece of paper that came with'em.

 

I have been on another dyno today and it seems that there is a problem. the boost is even higher than what you have Shaun, and the car as I said before seems a lot faster than on VF36, however the dyno definitely shows that after 4.5k rpm it all goes pear shaped. any thoughts? I'm wondering if this is a poor map or the engine has developed a problem somewhere

 

Have you got Boost vs Torque & Boost vs HP dyno plots?

At approx 1.7 / 1.8 bar the standard Ecu will probably have a nervous breakdown as it cant read beyond that & cut boost & power anyway.
Who mapped the car?

 

unfortunately these are the only graphs I have, considering I am in Moscow, RUS you wouldn't know the guy who mapped the car, I'm talking with him at the moment regarding the situation

 

Do you have any power runs or info on what the car was making before upgrades on std turbo? (VF36/37?)

 

not really, the last time the car was on the dyno at Powerstation in UK and it did 343hp

 

JDM MAP sensor is 3 bar IIRC so 1.8 bar's just about OK: when on ecutek, my LM480-equipped build would boost cut at about 1.8 iirc.

If Ilya's is boost cutting I think he'd know about it.

What exhaust system is it Ilya (sorry if you said earlier)?

On the road, at what rpm are you seeing 1bar and max boost in, say, 4th gear?

 

Tim is it possible to change map sensors for different year ones. My 2004 Ver9 JDM sti seems to be boost cutting at 1.55bar (My Hawkeye spec did at approx 1.7/ 1.8 bar).
Just wondering if I could change it for a later version one.

Im also wondering whether my ECU may be cutting boost (when mapping) as it is hearing Phantom Knock. There is no knock on the det cans?

Apologies for slight thread diversion but it is kind of relevant

 

Yes, you can change the MAP sensor easily enough, but I'm afraid I don't know whether the ecu program itself cope with higher boost or not. You'll need a mapper to comment on that. My hunch is that it ought to be feasible.

Phantom knock is a common problem - mine suffered too, so the knock sensor was relocated during a mapping session to minimise the problem.

 

Rickya,
You can over-ride boost cut completely or raise the boost cut limit on the JDM OE ecu (not sure what is or is not possible on the UK variant). Have a chat with your mapper.

Ilya,
Your mapper should know if there is a problem.... he would be your first point of contact as you have suggested. Something certainly seems not right.

It's been so long since I had this problem myself, but it's worth you suggesting your mapper looks at the Neutral Position Switch is operating correctly. Again, not sure if this would result in the situation you're seeing.

Tim,
There doesn't *appear* to be anything wrong with his initial spool, comparing his run with that of his friends VF36. They look very close at low revs which is what I would of expected. However torque is extremely low for the level of boost, but as we have no idea of the ignition map it's hard to comment on that.

 

It might be a problem on a "rattly" 2.5 but I have never heard of this being "common" on an oe 2ltr. I'm willing to be educated.

 

Shaun,

By over ride you mean to stop the ECU from changing boost & just set boost without the ECU saftey (pain the ***) features?

And how do you raise the boost cut limit? Never knew it was possible without changing map sensor maybe?

 

Rickya,
I was referring to boost cut whereby you hit the max boost limit set by the map in the ECU. Nothing to do with any form of limp mode or whatever the OE ecu can do based on any safety parameters.

Boost cut would be (imo based on my experience) totally different to the ECU reducing ignition for limp mode etc. Boost cut feels like you've hit a brick wall!

Your mapper can change the boost cut level within the map.

 

Tim,
sorry to hear your car is still causing you problems. Feel free to call is you need anything.

Ilya,
I have sent you a email with our latancy values for the 800cc injectors. I would be a little concerned with his experience if he is asking for these and by the high level of boost you are running. the LM400 should run about 1.5bar through the mid range about about 1.35 at the very top. Although it can be made to run more there is little point and you just end up flowing hot air.

Regards

Iain

 

the boost cannot be monnitored beyond 1.55bar but the ecu can see higher and will boost cut higher (depending on what the boost cut is set at) and will control the boost higher to the limit of the map sensor.

You can change the map sernsor and change the settings inb the map but sounds like the boost cut is set too low or you are now running more boost than it is mapped for?

if ecu is picking up phantom knock it would be easy to spot as ecu would be pulling timing with no det in det cans.. the ecu will pull boost back to actuator pressure if it retards the timing beyond a set amount.

Simon

 

Simon,
Not sure I understand your remark about the fact boost over 1.55 can't be monitored.

I can see internal boost pressure over 1.55bar.... Are we talking different things here?

 

delta dash can only monitor to 1.55bar

 

16bit ECU is the limiting factor, as in only reads up values up to 255 in the code, which is why you are unable to read above 1.55

 

So why does the Internal Boost parameter of the MEGAROM in Delta Dash capture data over 1.55bar then.

 

Thanks JGM & Shaun for comments

 

Thx 4 the e-mail Iain, I am a bit concerned about the guy myslef now, I used his garage for all sorts of things 4 many years without a problem, but never had him map my car, the main reason why I have asked you for the latency's is because I'm planning to try another company if he doesn't come up with a solution in the following week. I have Apexi AVC-R boost controller and I thought to either install the device or just use the three port solenoid from it, but he said there is no need for it. I also have a Walbro 255 pump lying around, in Moscow all Sti owners change them, but he also said no need, so now I'm looking for a decent company with a dyno, as we have mapped my car on the street, in fact there is only a few garages with inhouse dyno in Moscow, which produces a problem. I hope it will all work out, if not i will simply drive to UK and back once more maybe not

 

No need for the Apexi.

Three port is not a requirement but can help things along.

New uprated pump is not always a requirement on the JDM's at this level, but can be worth it for safety's sake.

No need to get the car mapped on a dyno imo. It all depends on what your mapper has access to and prefers. Nothing wrong with a dyno being used though, but it is not a requirement.

I would however recommend your mapper uses the MEGAROM code, which for the clever stuff will need to be done on the road anyhow.

Hope you get it sorted.

 

My Deltadash logs clip the boost at 2.55BAR Absolute, which is 1.55BAR relative to atmospheirc pressure. You sure you can see above that Shaun?

I've seen 2.2BAR boost when we were playing with the waste gate restrictor setup on my new 2.1 engine, no sign of any cuts at all. It normally runs 1.8BAR mid range as seen on my Defi's.

 

it doesnt, it measure absolute boost ie. 1.55bar plus one atmosphere = 2.55bar

Simon

 

John,
Look at the "Internal Boost Reading 2002" available as part of the extra's with MEGAROM.

For example 1.77bar on my Delta Dash log below.

 

interesting,.. will check that next megarom I do

 

You're not wrong Shaun, just plugged into mine and there it is.

Whats the limit it can show?

 

Jam your wastegate shut and find out!