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[ifly87]

This problem has been haunting my build for the last two years, and I dont know what else to do.

The problem is while boosting at WOT or really any throttle after about 15psi the boost starts fluttering like crazy, i'm getting very bored running around at 15psi.

d16z6, trying to fix this problem I practically put a brand new turbo setup on it besides the turbo and engine itself, NEW

from stock to skunk2IM
from stock to 65mmTB
from ebay kit to all mandrel bent pipe and welded by me Charge piping
went from HKS knockoff to tial BOV
went from china crackie chan mani to SPA topmount cast manifold
went from china wastegate to turbonetics deltagate
I'm using a t3 turbine .63, and a TO4E .70 compressor housing (not exactly sure what trim wheel .57 I think)


The only thing I can think of is that with both of my setups I have been using a low pressure spring in the wastegate, like 6-8psi springs. Boost starts to build nice and solid but as it reaches time for the wastegate to open it flutters, sometimes the wastegate opens and boost stabilizes, other times it just keeps fluttering. I am getting very pissed. AFR's are good and adding timing seems to help it a LITTLE bit but doesnt cure the problem. Please help!

[buk9tp]

[buk9tp]

[bigdaddyvtec]

Blowing the spark out

[ryan89crx]

I was having the same problem over 15psi. I swapped the 7psi spring out for an 11psi spring and it still did it. I was convinced that it was the Profec 2 EBC. However I never got around to fixing it before I split the sleeve wide open.

I don't think it was blowing the spark out, that was a totally different feeling. My setup was doing that on the dyno, closed the gap and it went away. The boost fluctuation was a completely different animal.

[ifly87]

I've tried multiple boost controllers now, 2 manual and 1 electronic, same story with all. Maybe its just a poorly sized turbo?

[turbob16hatch]

Measure the wheels when you get time. that will tell you the numbers to get trim.

[mrgreengenes]

boost ramp up compressor surge?

[ifly87]

boost ramp up compressor surge?

I guess thats what you would call it, yeah.

Blowing the spark out

Maybe, I've gapped the plugs down, and the problem persists. I do have a completely stock ignition though, maybe I should try an external coil. Also it seems to do it through the middle of the power band say from 5-6.5k and then the boost steady's out and holds solid at given boost pressure till redline. And Its def. dependent on load since in 1st id doesnt do it at all just spins tires and holds boost nice and steady, and second it only does it until the tires break loose then holdsnice and steady again. in 3rd it just flutters like crazy and really doesnt make shit for power. I dont want to keep trying this because I'm sure its not good for anything.

Today I took off the wastegate, and added a washer under the spring to tighten it up a bit and it didnt change anything.

[lilpooh21186]

Basemap may be to conservitive timing wise

[ifly87]

as I add timing it seems to get a little better but not still surges.

Could it just be a poorly sized turbo for the engine? The more I read, it seems that this may be the probmem, but then I think about some guys running holsets on their d16's.

[turbob16hatch]

Measure the wheels when you get time. that will tell you the numbers to get trim.

[DRQPQUT]

you said it yourself, its boost surge..so i wouldnt fuk with your ign. your stock ign is good for 500+hp  im leaning more towards the wastegate malfunctioning. you should be able to clearly tell the diffrence

[ifly87]

Yeah, I had the wastegate pressure source coming from one of those tuner toys vaccum manifolds, so I am welding a fitting right on the charge pipe for the new sorce. Also, there was a loose hose going to that vaccum block, so that may have been fucking with me.

im leaning more towards the wastegate malfunctioning. you should be able to clearly tell the diffrence

The ignition seems to be operating correcly, unless its in the maps but other than that mechanically its working good. I had one of those ebay wastegates on it, ripped it off and switched to a turbonetics deltagate and its the same. I'm re-routing the vacum lines and putting in a catchcan tomorrow and try it again.

[ifly87]

Ok tonight I got the car back together and made some pulls and shot some video. Sorry for the poor quality but you get the idea.

Boost is set at 14psi, the boost climbs to 20 then surges for a second or two, then settles down at 14psi. When I shift into 3rd I am at WOT until its lifted and you can see the boost surges slowly between 15-20psi for a few seconds before settling at 14.
d16z6 w/g flutter or compressor surging?


second vid this is a 2nd and 3rd gear pull. You can see boost creeps to 20psi then flutters violently until dropping back down and holding steady at 16psi.Compressor surging at WOT, boost is set at 16psi


3rd vid is a ripper vid, d16z6 vitara at 15psi


Oh yeah I dug out the papers from when I bought the turbo, it is a 57 trim if that means anything.

[boosted 00 black si]

u should try changing the wastegate

[ifly87]

I have changed it from a china gate to a turbonetics gate, but the turbonetics gate is used. I really am thinking/hoping it is still a wastegate problem.

[boosted 00 black si]

turbonetics wastegates are shit!! i had a similar problem a few years back  n i was using a turbonetics wastegate i swap it out with a BRAND NEW TIAL problem solved

[ifly87]

well thanks for the info, I'm going to order a tial. I'm still not convinced its going to solve the problem though. If I'm going to be running 20+psi on the thing should I get a 14psi spring in it? The china gate I was running had a low psi spring in it and it did the same thing.

[turbob16hatch]

what i always read was try to not double the springs pressure as it has less ability to control boost.

[boosted 00 black si]

i would try the 14psi spring but when u get it run it off the wg spring with no boost controller at first

[ryan89crx]

Mine looked exactly like your second vid. Like stated before, I changed the spring out for a Tial 11psi and it still did it above 14psi.

Change your vac source and boost controller and see if that fixes it.

[ifly87]

Yeah, when I run the turbonetics delagate off with no boost controller it opens at about 6psi with no flutter, with and (tried 3) boost controller hooked up it surges pretty much no matter what.

Today I changed the boost sorce to about 3 or 4 inches from the turbo so the line is only a few inches long to the wastegate.

Mine looked exactly like your second vid. Like stated before, I changed the spring out for a Tial 11psi and it still did it above 14psi.

Change your vac source and boost controller and see if that fixes it.

How did you end up fixing it?

[ryan89crx]

Mine looked exactly like your second vid. Like stated before, I changed the spring out for a Tial 11psi and it still did it above 14psi.

Change your vac source and boost controller and see if that fixes it.

How did you end up fixing it?

I raped the fuck out of it until it split a sleeve 

Wish I had the answer, but I'll be running a different boost controller this time around. Hopefully that will fix my issue

[ifly87]

what controller were you using? what would you suggest? EBC's are awesome but so damn expensive.

[ryan89crx]

what controller were you using? what would you suggest? EBC's are awesome but so damn expensive.

Greddy Profec B spec2

I'll be using the eCtune boost solenoid on this setup

[ratcityrex]

have you tried a diff wg spring? Like a 12 or 14lb spring?

[ifly87]

have you tried a diff wg spring? Like a 12 or 14lb spring?

No, I dont have one. I just ordered a Tial 38mm wg with a 14psi spring in it, hopefully it fixes the problem.

[boosted 00 black si]

u get that wg yet?

[TTC]

Also curious