Brad850 Posted December 10, 2013 Report Share Posted December 10, 2013 Newish 18t Forge cbv Ard wastegate AC delco bcs FMIC all silicone vac lines 21-19 vac at idle Mostly at half throttle and sometimes full throttle... boost drops drastically and then shoots right back up. Like 15 to 10 to 15 and then holds. I set my new wastage actuator at around 4 psi. Is that boost cut? Link to comment Share on other sites More sharing options...
Brad850 Posted December 15, 2013 Author Report Share Posted December 15, 2013 Wow. I disconnected my waste gate. The car has never held boost that well in the past. I was holding it at a solid 15 and the car was pulling hard at 3k. Never felt that before. I could have held it at 18 but that was a little too close for comfort. Does this mean my new actuator is bad? It's set at 4.5 psi. Link to comment Share on other sites More sharing options...
Brad850 Posted December 22, 2013 Author Report Share Posted December 22, 2013 When the actuator is connected to vacuum, the car jerks back and forth when the boost cuts off and instantly cuts back in. Link to comment Share on other sites More sharing options...
DAYWALKER Posted December 22, 2013 Report Share Posted December 22, 2013 i have the same problem like you. for some reason the 4.4 blue tune is not controling boost like it should. if i run it straight from the wastegate actuator the car build boost fast and strong holding at what ever size of the actuator. when i hook it back up to the tcv which the tune is control by it have a mind of it own. mostly overboost or sometime it would surge between 15 psi than to 20psi. i have email lucky about it. let see what he have to say. i have already buy a manual boost controller. i might just run it until the problem is solve. i'll keep you update when i receive my mbc. Link to comment Share on other sites More sharing options...
Brad850 Posted December 22, 2013 Author Report Share Posted December 22, 2013 Thanks. Definitely keep me updated. I figured it wasn't a tune issue... being that no actuator = solid boost. But I guess it's still a possibility? I'm going to put my stock R tune in with the actuator hooked up next. Wastegate set at 4 psi = Boost cutting on and off/ can't exceed 15 psi at full throttle 5 psi = Boost cutting on and off/over boost to 21 This new wastegate seemed to surprisingly exacerbate my problem. Link to comment Share on other sites More sharing options...
Rsterns Posted December 23, 2013 Report Share Posted December 23, 2013 One thing to check. You want the vac. lines from the TCV to be as short as possible. Long lines can play funny games with how boost comes on. I wouldn't go pointing at the tune just yet. You have other variables to consider. Link to comment Share on other sites More sharing options...
DAYWALKER Posted December 23, 2013 Report Share Posted December 23, 2013 Lucky say my .5 bar actuator is too strong for the tune I have. He say I will need a .3 bar actuator to work right with the tune or he can reprogram to make it work with the stronger actuator. I opt. To just get a .3 bar actuator. That is weird if the tune is that sensitive to the size of the actuator you have to run right. If that is true it should be on his build sheet I think. Well I'll keep you inform. Link to comment Share on other sites More sharing options...
Brad850 Posted December 29, 2013 Author Report Share Posted December 29, 2013 Ok. This is my car at half throttle. I am not lifting off or pushing down at all. A little more throttle. Still not WOT I tried my stock R tune today. I didn't want to go above 5 psi but, it held it very well and the power delivery felt smoother. I'm going to swap in a stock bcs, just to make sure my ac delco isn't the issue. Link to comment Share on other sites More sharing options...
DAYWALKER Posted December 29, 2013 Report Share Posted December 29, 2013 Ok. This is my car at half throttle. I am not lifting off or pushing down at all. I tried my stock R tune today. I didn't want to go above 5 psi but, it held it very well and the power delivery felt smoother. I'm going to swap in a stock bcs, just to make sure my ac delco isn't the issue. mine does that also. it will go away once the computer adapt to the boost on set. when i clear out the memory it will do it again for a few days(blue tune 4.4). that is weird because the green tune 4.4 it never did that Link to comment Share on other sites More sharing options...
DAYWALKER Posted December 29, 2013 Report Share Posted December 29, 2013 today i install the .3 bar actuator with the lowest setting possible (rod all the way out) and it help with the over boost problem but still boosting to 21psi. anything over 18psi something it would misfire. so what i did was just install the mbc from the vacuum tree and tee it to the wastegate actuator. set it to 18psi and it work out great that way. boost build strong and hold at whatever i set the mbc at. i know this is just a bandaid for my overboost problem but for now at least i can wot without needing to let off or shifting to a higher gear. i think the tune can't control the boost properly. some people have overboost problem and some just can't hit the target boost. Link to comment Share on other sites More sharing options...
Brad850 Posted December 31, 2013 Author Report Share Posted December 31, 2013 I'm trying to rule everything out before I consider the tune. Threw in kevins ard tcv and still same issue. Also, with his 98 R tune, boost wouldn't surpass 5psi and it felt it didn't want to redline. The only thing left I can think of is to do a boost leak test or try a new maf. Although, it held a very solid 15 psi with the actuator disconnected, so I doubt it's that. Might end up sending my tune to lucky soon. Link to comment Share on other sites More sharing options...
Kevin. Posted December 31, 2013 Report Share Posted December 31, 2013 just come over and try my known good MAF Link to comment Share on other sites More sharing options...
Brad850 Posted December 31, 2013 Author Report Share Posted December 31, 2013 just come over and try my known good MAF Just did. Same problem. Link to comment Share on other sites More sharing options...
DAYWALKER Posted December 31, 2013 Report Share Posted December 31, 2013 Mother f. Past few days it started to do it again on me but not as bad. Link to comment Share on other sites More sharing options...
Brad850 Posted January 1, 2014 Author Report Share Posted January 1, 2014 nvm Link to comment Share on other sites More sharing options...
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