Originally posted by mefarri
The stock one can't bleed off boost fast enough and that's why I lifted ring lands on cylinders 2 and 3...

No comment. Just watching the show from the bleachers and opcorn:

 

Originally posted by MrZ-MR2+--><div class='quotetop'>QUOTE (MrZ-MR2)</div>

<!--QuoteBegin-mefarri

The stock one can't bleed off boost fast enough and that's why I lifted ring lands on cylinders 2 and 3...

No comment. Just watching the show from the bleachers and opcorn:[/b]

What? is there something amusing about that?

 

Originally posted by mefarri+--><div class='quotetop'>QUOTE (mefarri)</div>

Originally posted by MrZ-MR2@
<!--QuoteBegin-mefarri

The stock one can't bleed off boost fast enough and that's why I lifted ring lands on cylinders 2 and 3...

No comment. Just watching the show from the bleachers and opcorn:

What? is there something amusing about that?[/b]

I think it was the "it ran perfect until it blew up" part.

 

It ran perfect until it spiked because of a mechanical failure. There.

 

I am trying to figure out what you meant by the internal gate could not let off boost fast enough. Your wastegate valve size is obviously large enough to control boost if you had been running a solid level before this. If the internal couldn't bypass enough exhaust gasses you never would have had stable boost levels. It would have creeped.
Boost spike is usually caused by some problem with the boost controller. Hell, even temperature changes can effect your boost levels.

I think you are under the wrong assumption if you think an external wastegate would have changed things.

 

No I'm not. The internal gate is fine for normal boosting but the boost came on so hard so fast during the wheel spin that it went past it's normal bleeding capability. This is why you hardly ever see any high output turbo motor with an internal gate.

 

OK. What do you consider high horsepower? Over 400 wheel HP on pump gas? 500?

 

dman™, when did everybody start shooting for 500+hp??

 

^ i know! :roll:

now you are getting me thinking Matt, i see my boost go up a lb or 2 at WTO. i am not sure what it spikes to because my laptop gave out too early to run good tests...

getting an external gate would help that greatly...

 

Originally posted by mefarri
No I'm not. The internal gate is fine for normal boosting but the boost came on so hard so fast during the wheel spin that it went past it's normal bleeding capability. This is why you hardly ever see any high output turbo motor with an internal gate.

Do you know that the E-01 has a warning light and beep for overboost situations?

Did you think that it's a not a good idea to run such a high amount of boost (12 psi) on a road course with a stock engine?

 

Originally posted by mefarri+--><div class='quotetop'>QUOTE (mefarri)</div>

Originally posted by MrZ-MR2@
<!--QuoteBegin-mefarri

The stock one can't bleed off boost fast enough and that's why I lifted ring lands on cylinders 2 and 3...

No comment. Just watching the show from the bleachers and opcorn:

What? is there something amusing about that?[/b]

Yeah, there is, to me. I get amused by different things than others do.

 

Originally posted by 22XY
dman™â„¢, when did everybody start shooting for 500+hp??

When they started aiming for the stars instead of assuring they can reach the moon or even get back.

 

Originally posted by morris
.. we changed the rmp limit by changing the limiter from another ecu.. they are like frequency crystals found in RC cars and its been working fine...

My concern with crystal swapping is the unintended effect it will have on the firmwares calculation for VE and load. The stock ECU must have redline stored in the code somewhere how else would it enable fuel cut?

The part throttle hi-rev road coarse scenario is something I never considered...

Thanks for responding Matt, wasnt sure how to draw you out

One way to induce det with the EMB and large injectors is to put the ECU into a way too aggressive part of its timing map by using large negative values simply to pull fuel. Reducing the MAF signal to reduce the load in order to reduce fuel will also cause the stock ECU to advance the timing.
An inapproriate amount advance at the wrong load point and snap, crackle POP!!

KNowing what the true timing is with a piggy-back is impossible without a scanner and even then you have to add the EMB IGN map values to the OBDII report. After you matchup the loadpoints that is.

 

Originally posted by Tikked+--><div class='quotetop'>QUOTE (Tikked)</div>

<!--QuoteBegin-mefarri

No I'm not. The internal gate is fine for normal boosting but the boost came on so hard so fast during the wheel spin that it went past it's normal bleeding capability. This is why you hardly ever see any high output turbo motor with an internal gate.

Do you know that the E-01 has a warning light and beep for overboost situations?

Did you think that it's a not a good idea to run such a high amount of boost (12 psi) on a road course with a stock engine?[/b]

yea I know I just didn't have it set up but either way it wouldn't have helped. It was supposed to bleed it off at 12-12.5 and it hit 15.5. a warning light wouldn't have helped-it was instantaneous.

 

I vote for the HKS PRoV because it shoots the biggest flames. The rev limiter kills ign and not fuel.

 

I thought I used to know the answer but now Im confused.

If the revlimiter doesnt cut fuel then bouncing off it will lead to cylinder wash ,oil dilution and raw fuel covered cats. Doesnt make sense to cut spark only.

Then again, Jay Hassinger posted up about how it may cut BOTH and thats the reason rasing the revlimit with the EM-U is problematic...

 

overboosting while using an electronic boost controller is not a mechanical problem, its electronic. :wink: in other words, its apparent your boost controller skills suck. now you need a new engine. good luck.

 

sorry matt you just got...

 

Originally posted by turbo_jimbo
overboosting while using an electronic boost controller is not a mechanical problem, its electronic. :wink: in other words, its apparent your boost controller skills suck. now you need a new engine. good luck.

How is that? The electronics were supposed to do their job at 12.5 and they tried but the wastegate wasn't physically large enough to perform what is was asking. That's mechanical.

 

Mefarri, You should change your sig to " Turbo project blown! j/k
But seriously, did you set up your gain in your greddy ebc correctly? Setting it on the high side will give you a more "explosive" burts of boost but you will be more prone to boost spikes.

 

gain is difficult to tune.. it changes so radically it gets on anybody's nerve

an external waste gate wiill help you get rid of some spikes

 

Originally posted by morris
gain is difficult to tune.. it changes so radically it gets on anybody's nerve

an external waste gate wiill help you get rid of some spikes

yea I know. morris knows what I'm talking about.

 

Seriously, read how wastegates function. What you experienced was not a mechanical problem with a wastegate. It was in the boost control. Go ahead, keep being bull headed and not listed to the people that know more than you and you will be back in the same boat with yet another engine and an external wastegate.

 

Originally posted by turbo_jimbo
overboosting while using an electronic boost controller is not a mechanical problem, its electronic. :wink: in other words, its apparent your boost controller skills suck. now you need a new engine. good luck.

Werd. Let's try to think of more ways to explain the same thing. Obviously we haven't hit the key phrasing just yet.

 

the only thing that the electronic side could have done was adjust the gain, but the gain was perfect when there was no wheel spin. I tuned it so it would hold a PERFECTLY flat line of boost. It would come up to 12.5 and hold it rock solid with no creep. There was nothing I could have done.