COMPRESSOR SURGE IN MY MTNTK AXYS TURBO KIT... AND WHAT TO DO?

mountainhorse · Jan 15, 2017

Double D....

I guess we disagree then.
That tube is what... maybe 8 or 9 inches long on this sled??... Has an I'd of 3/16"...

My take....IMO... my 2¢
So long as the oriface on the fitting mounted to the reeds is sufficient...as well as on the CRV... and there are no kinks or defects in the hose... The engine moves enough air volume to pull a vacuum (or pressurize) the CRV in micro-seconds.

Is there some scientific/quantifiable nanosecond interval that of delay from the time of pressure change to the time of CRV opening/closing... of course... but I don't think it would be perceivable to the rider... but then again... I don't have this kit, so I'm speculating here... Tangerine is the man to ask about that.

I am interested in hearing why this would be different at higher altitudes. (sincerely)

Good discussion.

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Davajn · Jan 16, 2017

tangerine_sky would you mind measure the spring that you cut? Im getting my kit in 2 days and would love to make the modification directly.

Cheers

tangerine_sky · Jan 17, 2017

I got you bro.

sledhead9825 · Jan 21, 2017

T Sky. Any updates ? You happy with your modification?

tangerine_sky · Jan 21, 2017

sledhead9825 said:
T Sky. Any updates ? You happy with your modification?

The BOV mod is working well. It holds boost well. Been data logging it holding at 9-9.3 psi with no issues. It purges more often, removing an appropriate amount of air to prevent compressor surge 80% of the time. The stock spring would never purge or only in extremely rare instances.

I would recommend it to anyone wanting to reduce the amount of compressor surge they're experiencing.

As far as whether the turbo spools quicker or not, it's hard to tell at this point as I am already used to the new spool characteristics. Initially it did feel like it was spooling up again sooner, but honestly without data logs before hand it could just be placebo.

mountainhorse · Feb 19, 2017

Any follow up on this Tangerine Sky??

Listening to Burants "Jenny Craig" turbo... LOTS of compressor surge in that one.
In a sled that seems to want to take everything to the "Nth Degree"... that surge, to me, is leaving something on the table.

<iframe src="https://www.facebook.com/plugins/video.php?href=https%3A%2F%2Fwww.facebook.com%2FChrisBurandt%2Fvideos%2F1385590818171885%2F&show_text=0&width=400" width="400" height="400" style="border:none;overflow:hidden" scrolling="no" frameborder="0" allowTransparency="true" allowFullScreen="true"></iframe>

.

JJ_0909 · Mar 3, 2017

mountainhorse said:
Any follow up on this Tangerine Sky??

Listening to Burants "Jenny Craig" turbo... LOTS of compressor surge in that one.
In a sled that seems to want to take everything to the "Nth Degree"... that surge, to me, is leaving something on the table.

<iframe src="https://www.facebook.com/plugins/video.php?href=https%3A%2F%2Fwww.facebook.com%2FChrisBurandt%2Fvideos%2F1385590818171885%2F&show_text=0&width=400" width="400" height="400" style="border:none;overflow:hidden" scrolling="no" frameborder="0" allowTransparency="true" allowFullScreen="true"></iframe>

.

Sled is a beast. Wish I knew his suspension setup...seems to get a ton of transfer on that 165 without megatrenching

die hard poo · Mar 3, 2017

I believe he uses the Skinz ARC on his sleds. Which why sometimes hes in full wheelie mode, then having controllable ski lift the next moment.

tdbaugha · Mar 4, 2017

He's not running a conquer anymore. FYI

Sunvang · Mar 4, 2017

tdbaugha said:
He's not running a conquer anymore. FYI

You know the reason why? I have the conquer, and like it more and more as i ride it.

roughrider99 · Nov 21, 2017

Reviving this as i was doing research for my mtntk kit when it arrives. If low vaccum is an issue.in my last turbo kit I put together in my pro I ran a vac signal from BOTH throttle bodies tee'd to BOV, signal was between throttle body and reed. I feel post reed would get pressure pulses and not a clean vaccum compared to pre reed. Never had surge and the spring was far from light.

Thoughts? I'm really thinking of drilling and tapping into both throttle bodies then move onto spring changes if required

Davajn · Nov 22, 2017

I actually changed mid season last year from postreed to prereed. And after i had the reeds up i saw that drilling in the side of the reeds that mtntk instructs, aint such a good way to do it. When you drill it you will destroy the rubber gasket and you will have a possible point of leakage.

Now i only tapped into one rubber boot and it made some difference. But i've also cut the spring for the blow off valve abit. That made the most difference to be honest.

Might do as you said with drill n tap both rubber boots prereeds. That should give a more stable and stronger vacuum reference line.

xpturbo600 · Nov 22, 2017

The video on compressor surge is wrong. The turbine shaft actually speeds up during surge; it does not slow down. Therefore, it won't really affect respool. But, dont get lost in the details. To fix the issue, you need to get a better vaccum signal or fatigue the spring in the bov (i.e. soften the spring). However, it seems as though you have dont this by cutting the spring instead.

To address another issue, Mtntek is incorrect as well. Airbox volume will not cause surge, it will only reduce pressure fluctuation in relation to the additional volume.

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COMPRESSOR SURGE IN MY MTNTK AXYS TURBO KIT... AND WHAT TO DO?

mountainhorse

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Davajn

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