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Not getting the boost I should


ghostrider00
07-03-2006, 04:27 PM
hey all... been having a problem trying to get my manual boost controller set up correctly. The boost controller is a greddy mbc and the wastegate is a TIal 38mm (7lbs spring). According to the instructions that I was able to get from Tial I set it up as follows. I have the vacuum line coming from the top of the wastegate to one of the two fittings on the mbc. I have another vacuum line that comes from the side of the wastegate and 't's with a vacuum line coming off of the other fitting on the mbc and then that leads to a port on my throttle body that is before the throttle plate. Hopefully I explained this well enough for everyone to understand. So, anyways, I have it setup this way and have not been able to boost over 6-7lbs. I'm assuming I have something all screwed up, and I'm sure it's something real simple and obvious, but for the life of me I haven't been able to figure it out. Any help is greatly appreciated, thanx.:banghead:

CivicSpoon
07-03-2006, 05:43 PM
I have no knowledge of Greddy boost controllers, but I have run into similar problems with ones from other companies (turbo xs and turbosmart). Try taking off the top port of the tial and only use the bottom port (I know with the turbo xs one, it wouldn't work if you connected it to the top port). Or try changing the hoses around. But you should check out Greddy's instructions over Tial's, it might tell you something different.

ghostrider00
07-03-2006, 05:50 PM
I have tried swapping vacuum lines around and unfortunately did not get anywhere with it and at times actually got no boost, although I can't say for sure that I've tried every possible way of running them. I tried to get a diagram from greddy but wasn't able to find anything and the only one I was able to find was from tial. The controller is the greddy T.V.V.C. On their website they do have some diagrams and info regarding their electronic controllers but unfortunately nothing for the trust manual controller.

CivicSpoon
07-03-2006, 08:11 PM
Maybe try this: http://www.honda-tech.com/zerothread?id=321667
Other than that, I couldn't find anything at all on that boost controller. Hopefully someone here has used it before and can help you better. If you don't get a better response, you might want to try the AF Forced Induction subforum instead, as it would be a more general question that just for H/A's.

ghostrider00
07-03-2006, 09:04 PM
thanx for trying, appreciate it. Anyone out there who has instructions for the greddy TVCC (in english and not japanese) it would be a huge help, or anyone who has the TVCC and knows how to route the vacuum lines, feeling 'stupider' by the minute cause I can't resolve this issue.

TEXAS-HOTROD
07-06-2006, 07:45 PM
You explained it perfectly, Mr.Ghost.
I have more super charger experience than I do on turbos, but I'll try me best. My guess is that the waste gate is still getting manifold pressure, and not mbc pressure.
Do you have a low pressure gauge that you can check the lines to see which line does what? You need verify that the controller is sending a variable pressure signal to the waste gate and not direct pressure. If you have an air compressor and a regulator, you could use a low pressure (like 5 psi) source to check the system. That way you won't have to waste time w/test drives (or blowing things up by over boosting).
The waste gate has 2 ports? What's the 2nd port for? You might try plugging off the side port (and plug the line) to see if it works properly. If the side port is teed into the pressure feed of the controller, you are still sending non regulated boost pressure to the waste gate. A 7lb. spring gives 6/7psi from the turbo, correct?

Hope you figure it out.

ghostrider00
07-10-2006, 07:06 PM
okay so I have an update...I have been able to eliminate the boost controller from the situation. I installed a 20lb spring in the wastegate and have the vacuum line set up to the side port of the wastegate to the intake. Now I took the car for a quick drive to see if I would actually boost over 7lbs. I actually was able to get 8lbs!!!! So obviously I still have a problem but it is of a different sort now. Anyone have any ideas of what it might be? I already smoked my whole intake system including the turbo, all the charge piping, intake manifold (and vacuum lines) and did not find any leaks. I guess my big problem at this point is that I don't know if the reason for my lack of boost is either it's bleeding off somewhere or the turbo for some reason is unable to generate more then the 8-9 lbs I'v gotten. I was gonna check the seals on the turbo next, any ideas are extremely appreciated.:screwy:

TEXAS-HOTROD
07-10-2006, 07:20 PM
Is the waste gate on the turbo or in the exhaust pipe? What size engine and what size turbo?
Any chance of the waste gate not closing all the way? Is your throttle opening 100%?

ghostrider00
07-10-2006, 07:31 PM
Is the waste gate on the turbo or in the exhaust pipe? What size engine and what size turbo?
Any chance of the waste gate not closing all the way? Is your throttle opening 100%?
It's an external wastegate that bolts directly onto the exhaust manifold... the motor is a gsr motor, 1.8L DOHC VTEC... the turbo is a turbonetics T3/T4E turbo... as far as the wastegate goes, I figured if it was stuck open in some way then I wouldn't be able to get the amount of boost I am getting, once I get past the turbo lag and start to build boost I get to 8lbs quickly and with ease, on top of it I can generally hear the wastegate open and bleed off the boost and it doesn't sound like it is but obviously I can't be 100% sure of it. And seeing that I now have a 20lb spring in the wastegate I can only assume that the wastegate is staying closed. As far as the throttle, if I could put the pedal any further through the floor mat I would... If you got to tialsport.com and click on there wastegates and click on there diagrams for the installation it might give you a better idea of the wastegate is set up.

CivicSpoon
07-10-2006, 09:03 PM
Could be a bad wastegate diaphram. I had a similar problem on a customers car and we couldn't get it to work ever. So my friend ended up changing the Tial out for a Turbonetics Deltagate, and it started boosting fine (from 6.5psi right to 14psi). You might want to call Tial about it and see if there is anything they can tell you, or try searching over at honda-tech for more info.

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