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14 Q50 AWD, ARK, ECUTEK (SEB), Takda,

esfourteen

car is back, but I have to push off the dyno. no time to install the boost controller this week so I'll do that saturday instead

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esfourteen

Installed the GFB boost controller and I still have the same issue, running over 12psi boost drops hard around 6800 which means either the turbos are too small (obviously not the case here) or there's too much exhaust flow and it's pushing the WG door open(ding ding ding). Most guys run external WG's which are dual port so they don't have this issue, so I just ordered a set of turbonetics dual port internal actuators.



The way these work is by applying a boost source to the top half of the actuator spring which helps prevent the exhaust gasses from forcing the WG open. Once I install these I will finally get it back on the dyno.

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mikey1600

Hey mate,

congrats first on getting the car back and working out the issue of the boost drop

do you think this would still happen on the .86 models of the same turbo's with IWG? Reason I ask is if I eventually get my GTM kit, these are the turbo's I will have and eventually up the boost over 10-11psi once I upgrade to an e85 compatible system.

I also missed which GFB product you have, is it the newer style G-force II? I've got the same one but haven't really seen any reviews of it yet.

esfourteen

I have the .86 housings, so yes it will happen, but not at low boost. I can easily
hold 10-12psi to redline without issue, beyond that on the internal WG's you will see a drop, stock block I wouldn't worry about it, you shouldn't be running more than ~14psi even on e85. These actuators only cost $65 a piece though so it might not be a bad idea to install them with the kit, you can still run as low as 7-8psi.

I'm using the new gfb g-force ii model, it works great, really like this unit very simple to use. I just wish it had boost by speed/gear.

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mikey1600

cheers thanks for the info, can you link me to a part number of the part you have ordered? I'll get them before the install to make it easier to run higher boost in the future without having to pull anything apart.

COSMO

I'm going out on a limb here but do you think maybe they didn't tighten the waste gate up enough?

esfourteen

if by "tighten the waste gate" are you asking if the flapper door is loose? it's most definitely not. if you mean preload on the actuator, it's set to 10.5psi currently, adding more preload can help with boost drop off but you sacrifice adjustability, I like running low boost when it's cold or wet out. it also wouldn't solve the problem 100%

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esfourteen

Turbonetics 30326

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COSMO

Ever get it retuned?

esfourteen

i have an appointment next saturday actually. I did dyno after installing the new actuators but boost was still falling off 3-4 psi up top, the actuators were set to ~11psi, the 2 runs are 14psi falling to 12, and 17psi falling to 13

This was an older dyno jet, which I happened to break after about 15pulls, and for some reason the turbos spooled incredibly slow on this thing. Adjusting gain on my boost controller had NO affect what so ever which tells you it wasnt even getting a chance to adjust anything because load wasnt high enough, where as on the street I can get 14psi by 3200rpm without overshooting target boost.



After this dyno I added as much preload as possible so the actuators are set to 13psi currently, 17psi hold to about 15 now and doesnt seem to drop off as early, but its so hard to tell on the street.

f*ck internal wastegates on this car.

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