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Discussion Starter #1
Ok so I dont want to destroy my engine here, but I want some more performance. I have read in numerous places that you can install a boost controller in such a way that the ECU no longer controls the boost and will allow more boost to be run. I understand that without an ECU upgrade you wont be getting the fuel delivery remapped or anything like that, but does anyone know anything about doing this. I know that its the way to blow the engine like that, but it seems to me that a few extra pounds could be run safetly, just as the ECU would do, and keep the reliability up. Anyway I was thinking about getting something like a Dawes device boost controller or something, installing it as I have seen done, or having it installed, and then running the recomended 13psi or so. Does anyone think this is a very bad idea or has anyone done this with good effect. As far as the ECU cutting off the fuel I have read on more than one occasion that this method will not allow that to happen, thats if you hook up the boost controller so the ECU still has control, inwhich case it will sense overboost and cut fuel. This method doesnt allow the ECU to sense the extra boost, of course the issue is that if the boost controller was to fail or not be set up right it will have no safety to shut it down.
 

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Re: Boost controller (pj's 850)

You probably have been reading up VS way too often. MBC is not evil, only the one who misuses it. But it's certainly not the best solution when you don't have anything else to assist with air/fuel control.<p>It's a long explaination itself, but if you already have your mind set on this THE NEXT BEST THING device...try it out. <IMG NAME="icon" SRC="http://********************/smile/emwink.gif" BORDER="0"> We've hear way to many ppl using this and have some problem. <p>I guess I just got a bit too lazy trying to save these ppl from doing silly upgrades. Why go through all the problem when you can just adjust your wastegate to give you that extra few lbs of boost? Internal wastegate not strong enough? Well, time for a stronger one. Still not enough? Aren't we greedy? Get a bigger turbo, intercooler and other bolt-on toys then. Oh...ooops..engine can't handle it? That's just the way it is sometimes when u try to get some more power.<p>You seriously won't see much of gain in that 2 extra psi with lots other upgrades..not worth the risk in my opinion.
 

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Discussion Starter #3
Re: Boost controller (The_one_n_only)

Ok thankyou, I guess you are probably right. So many people have told me to stay away from them. I tried the wastegate deal, but the improvement was not great, infact I hardly noticed it. The car seems to really lack in the low end. Not that Im all about this, but I cant even floor it and spin the tires, isnt that kinda sad, given how fast the car is. I would just like a little more off the line pep. I know that a manual transmission would probably be exactly what I need, but obviously that isnt an option. Ill probably end up getting a chip and exhaust, have the air intake. Ill probably do it in stages and get the car up there. I do believe that at a certain point you have to get a boost controller, I dont think you would want to rely on the ECU in a fully modified race level engine, but I am not going anywhere near that. Im sure that I will be very happy with 275 hp. I suppose I could always throw some nitrous on the fire, hehe, no no, that isnt a good idea, but it would give me more off the line pep.
 

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Re: Boost controller (pj's 850)

Maybe a Volvo factory turbo upgrade with stronger internal wastegate will help you to cure that. I know some good custom A/F/timing dyno tuning will go a long way...
 

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Re: Boost controller (The_one_n_only)

The problem people have with MBC is that they don't have enough fuel being delievered to support the higher boosts. That's why chipping is "safer," it changes the fuel maps for the car along with the boost.<p>Running 2 or 3 psi over your stock boost shouldn't cause a problem (T5 = 9 psi stock/11-12psi mbc, R 11 stock/13-14 mbc, LPT (GLT) 6-7 stock/ 9-10 mbc). If you boost too high without proper fuel you will bend a rod or blow a head gasket...but that's more like around 18-20psi. It would probably be a good idea to send the extra money to chip the car (and exhaust if needed), and use an MBC to control boost spikes (not raise pressure).<BR><BR>
[Modified by chopper, 10:19 AM 10-25-2002]
 

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Re: Boost controller (chopper)

<BLOCKQUOTE>quote:<HR>and use an MBC to control boost spikes (not raise pressure).<HR></BLOCKQUOTE><p>Actually if the turbo is at a decent size or the wastegate is strong enough, after proper tuning, you shouldn't get boost spikes like that.
 

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Re: Boost controller (The_one_n_only)

If you have good boost guage you'll probably notice spikes up to 12-13 psi on a T-5, spikes occur when the ECU processing is lagging and momentarily looses control. That's at bone stock.
 
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