compressor surge or something else?

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Topic: compressor surge or something else? (Read 15330 times)

rnagy86

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	Re: compressor surge or something else? « Reply #15 on: May 17, 2016, 10:47:18 AM »

Quote from: nyet on May 17, 2016, 10:13:02 AM

Hmm. In one of your logs, your battery voltage seems super low... 13.3 v... maybe alternator/battery/electrical?

Bad things seems to coincide with crossing 13.5 volts

I actually have a brand new alternator, i was only getting 12.7 v -ish charge previously.
I think 13.5V is acceptable with all the electrical stuff on and two walbro 450lph e85 pumps
going. I don't see how voltage could relate to this.


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nyet

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	Re: compressor surge or something else? « Reply #16 on: May 17, 2016, 10:48:38 AM »

Quote from: rnagy86 on May 17, 2016, 10:47:18 AM

How old is the battery? Can't hurt to try a new one. It isn't as if you have any other clues right now... 13.3 is pretty low


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rnagy86

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	Re: compressor surge or something else? « Reply #17 on: May 17, 2016, 10:50:25 AM »

Quote from: nyet on May 17, 2016, 10:48:38 AM

How old is the battery? Can't hurt to try a new one. It isn't as if you have any other clues right now... 13.3 is pretty low

1.5 years old maybe. but sure i can try a new one, it only costs $150, will try tomorrow Wink


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nyet

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	Re: compressor surge or something else? « Reply #18 on: May 17, 2016, 10:56:34 AM »

Quote from: rnagy86 on May 17, 2016, 10:50:25 AM

1.5 years old maybe. but sure i can try a new one, it only costs $150, will try tomorrow Wink

Wish I had better advice for you Sad


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rnagy86

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	Re: compressor surge or something else? « Reply #19 on: May 17, 2016, 11:02:44 AM »

Quote from: nyet on May 17, 2016, 10:56:34 AM

Wish I had better advice for you Sad

Could you check some other car's logs in case you have them handy?
I wonder about the voltage there.


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nyet

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	Re: compressor surge or something else? « Reply #20 on: May 17, 2016, 11:07:22 AM »

Quote from: rnagy86 on May 17, 2016, 11:02:44 AM

Could you check some other car's logs in case you have them handy?
I wonder about the voltage there.

im generally seeing 13.7 ish at the lowest

But very few of my logs have ub, so I don't have a good representation.


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jmont23

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	Re: compressor surge or something else? « Reply #21 on: May 17, 2016, 01:22:40 PM »

My battery voltage drops between 12v and 13v at full boost. No issues here.


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rnagy86

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	Re: compressor surge or something else? « Reply #22 on: May 18, 2016, 09:52:51 AM »

So I went crazy today and did two things.

#1 run the car without intercoolers, quickly bypassed them (no pictures sorry, i forgot to take 'em)

I saw a sudden overshoot of boost on ramp up, so I had to fix wgdc to 50% to see what's up and I noticed
that there is basically no surge at all at 1.6bar of boost, I stopped at 6k rpm because I knew IATs will be super high, well for sure
they were. 100C at 5.5k RPM and ECU pulling timing down to 2 degrees... thank you E85. Wink

Then I figured I have to try something else. I remembered from Flyboy's testing that the OEM RS4 intercoolers
flow better than the ERs, well the only problem is that I only have one handy, the driver side.
... but hey I have a set of C5 RS6 intercoolers which are GIGANTISCH (ref.: https://www.youtube.com/watch?v=5WSkKUjizxU).
Since I did not have enough silicone couplers for doing both sides with the RS6 coolers,
I did the driver side with the RS4 and the passenger side with the RS6 cooler.
I think I could not fit both RS6 anyway, they are really huge.... I mean it.
Don't laugh at me, this is eastern european style.

http://i.imgur.com/qSdP061.jpg

http://i.imgur.com/NtB2lkc.jpg

I also did a reference run with the ER coolers an hour before I installed these here are the results.
First is the ER then the RS6-RS4 combo.

What do you guys think?


« Last Edit: May 18, 2016, 09:56:59 AM by rnagy86 »	Logged

rnagy86

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	Re: compressor surge or something else? « Reply #23 on: May 18, 2016, 09:55:39 AM »

And here are the files.


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