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Discussion Starter · #1 ·
Greetings to all from a newbie. I have been enjoying the Swedespeed forums since discovering this site a few weeks ago and have found it very informative and helpful in connection with my order on an XC90 -- but that's another topic! My question concerns my 1995 850 Turbo: is there a way to bypass, remove or "detune" the turbo without adversely affecting ordinary driveability and reliability? My 16-year old daughter will be driving soon, and while I think that in virtually every respect, the 850 is a great car for her to learn on and eventually use, I am concerned that this car has WAY too much power for an inexperienced driver. Has anyone else addressed this issue? Thanks in advance!<BR><BR>
[Modified by Tony, 5:15 PM 10-31-2002]
 

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Re: 850 turbo "detuning" (Tony)

Detuning the T5, eh? That's the first, but I can understand where you are coming from with this when it involves younger family member behind the wheel.<p>You might want to consider turning down the boost level somehow. Anything else I can think of is not really practical and might have some adverse effect. Not that I'm a fan of manual boost controller, but that might be something you can consider using to tune down the boost.<p>But I'd say with the crazy traffic we have here in the DC metro, it might not hurt to have some punch when trying to merge on these busy highways.
 

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Re: 850 turbo "detuning" (The_one_n_only)

Tony,<br>Hi, and welcome!!! If I were you (and I <i>will</i> be, in about 13 years, with my own kid), I would keep the car as is. Why? I'd want my kid to have the extra "oomph" there if and when she needs it.<p>Younger drivers are not yet "blessed" with the things we experienced drivers take for granted...perception of speed of oncoming traffic, knowledge of your car's abilities (or <I>dis</I>abilities, if you're talking about a tiny and/or underpowered car), and knowledge about how your car behaves if you need to make any type of emergency maneuver.<p>I'd want my kid to have a car with some get-up-and-go, especially for merging onto the freeway. There's nothing that'll freak out a young driver like seeing the bull-nose of a Mack truck barreling down on you at 80...while you're on an uphill freeway on-ramp trying to get your car from about 15 mph up to 80 mph...in a jiffy. Turbo? Yes, please!<p>Unless she is the type that sits at home all day playing Formula Gran Prix with her T2 steering wheel & pedal, I think you will (and she will) be okay. Is she into the whole "automotive scene"? Do her friends all have new, high-powered cars? Are they the types to "race"? (Unlike 16-year-old boys, I would bet that most 16-year-old girls don't know enough about cars to really have that extra power coming from the turbo go to their head.)<p>My recommendation to you is this:<br>Giving her the car as-is, <B>AND ALSO</B> spending time on the road with her practicing gauging speed, merging, using turn signals, etc. would be a <i>far better</i> solution than robbing her of that extra power! (I'm sure you intended to spend time with her in the car, because we all know how lame high school driving courses are. I don't mean that comment as if you weren't going to spend time in the car with her. I just had to throw that in, because if I didn't, I'm sure that dozens of other people here would have elaborated on the importance of practice, and rightfully so! So I've saved them the effort...) <p>Sometimes young/new drivers need all the "edge" they can get, and *IF* it's that extra edge that helps get her out of a sticky situation (regardless of whether it's due to her own inexperienced new-driver moves, or somebody else's bone-headed moves), so be it. But at least she gets out of it, which is the important point! I wish the both of you the best of luck as you get her out on the streets and into the world of driving! <IMG NAME="icon" SRC="http://********************/smile/emsmile.gif" BORDER="0"> <BR><BR>
[Modified by Lisa62, 3:54 PM 10-30-2002]
 

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Re: 850 turbo "detuning" (Tony)

Valid concerns Tony but my recommendation would be not to "de-tune" the car, but "tune" the driver. Consider sending your daughter to a performance or defensive driving school to learn how to handle a car safely. You can use your own car at many defensive driving schools...which also gives the opportunity to become familiar with how the car responds in more unusual circumstances.<p>Empower your daughter and remember, she couldn't be safer - it's a Volvo.<BR><BR>
[Modified by 854R, 3:25 PM 10-30-2002]
 

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Re: 850 turbo "detuning" (Tony)

Well you can't remove the turbo....too many things have to be replaced, it's definatly not worth the effort or price. I agree with leaving it stock the most, becuase that will create the least problems. However, I also understand that you want to remove some of the power, therefore I would also agree with lowering the stock boost. If you're careful you can install a manual boost controller and set the pressure below stock. This would cost you somewhere around $40.<p>Man, I wish I got to drive a 850T when I was 16 =D
 

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Re: 850 turbo "detuning" (chopper)

Thanks to all for your thoughts. Having spent an inordinate amount of my adult life lusting after overpowered cars, the thought of detuning a car really goes against the grain! It sounds like other than perhaps a manual boost control (which presumably can be turned up as well as down!), it may be best to leave the turbo alone. <p>I especially appreciate the well-reasoned responses focusing on driver training. It takes years, and hundreds (or thousands) of hours on the road, to build up the database of experience required to develop the ability to multiplex the basic skills, instincts, foresight, judgment and reflexes to become a good driver. My plan for Allie's driver training includes basic driver's ed, lots of time behind the wheel with Dad (learning the finer points of vehicle dynamics, dealing with traffic, etc.), and a defensive driving course before she goes "solo." I have found a couple of advanced driving schools here in the DC area, including Decisive Driving (based in Rockville MD) and BSR (based at Summit Point race track in nearby WVA). I also plan to take the course -- it looks like fun, and I wouldn't mind a bit of track time myself! <IMG NAME="icon" SRC="http://********************/smile/emwink.gif" BORDER="0">
 

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Re: 850 turbo "detuning" (Tony)

Tony,<p>First, I'd have to agree with most of the already posted replies, in that you probably don't want to "de-tune" your 850 for<br> your daughter.<p>However, that said, if you can "trick" the on-board computer into thinking there is a fault in the engine, it will run the<br> car in a "safe mode", which automatically limits the turbo boost to 5PSI. <br>(I can't speak to the long-term effects of this though!)<p>Speaking from experience, this is a dramatic "de-tuning" of the 850's capabilities! (Grin).<p>My modified 850 didn't get along well with the aftermarket catalytic convert I installed, and the O2 sensors<br>kept telling the ECM that the "converter efficiency" was too low. This would in turn, cause the computer to <br>drop into the "safe mode" and limit the boost levels.<p>It took me a couple of months of driving around like this (and replacing just about every sensor, since I didn't <br>believe that the cat was bad) before I finally got smart and replaced the catalytic converter with a new one. <p>The car runs fine now, with no obvious signs of any problems from having been driven in safe mode for so long.<p>Hence, there may be some folks out there on the board who know a way to "trick" the computer into the safe mode,<br>which would give you the reduced boost levels without any drastic modifications to your vehicle.<p>That said, I'd have to say I'd recommend against doing this, as there could be some unknown problems that this would cause.<br>(Or for that matter, you could run into problems with emissions testing if you tinker with the O2 sensors and/or cat).<p>
 

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Re: 850 turbo "detuning" (MarkB)

Basically that's what an MBC would do in this case. You'd have to hook it up the "performance" way to eliminate ECU control. You would set it at 6psi (or whatever) so that the wastegate would open earlier and the car wouldn't be able to boost as much. If you go with an MBC, just be very careful tuning it, as you don't want to overboost your turbo, and you don't want the turbo not boosting at all (if possible with an MBC). I forgot to mention that you really need an aftermarket boost guage (one with numbers) to use the MBC with any sort of sucess, otherwise you have no way of guaging what your max/intermediate/etc boost is with MBC modification.
 

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Re: 850 turbo "detuning" (chopper)

Honostly I think that simply putting the shift setting to Econo is enough. It wont down shift as much giving you that real feel and jault of power, however you still have all the power on tap if needed. It really makes my car feel and drive much slower, and probably safer for a new driver. If you have a manual, than nevermind that idea. I got my T5 when I was 17, and I learned on this and a V8 Jeep Grandcheerokee-so both had balls. The one thing you will have to watch out for is Torque steer. When I first started learning I would end up flooring it or giveing it too much gas and having the torque steer practicly rip the wheel out of my hands. I had some close calls because of that. It took some time for me to get used to driving the Volvo before that happened. I dont even notice that cars torque steer anymore, or maybe it doesnt have it anymore if thats possible, but I remember those close calls. Maybe those suggestiong will be more practical.
 

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Re: 850 turbo "detuning" (Tony)

Tony, believe it or not, I had the exact same thought, about de-tuning my 855T, for my son, inspired by posts regarding some 850s lasting more than 200k miles. What better car for a teenager to start driving than a safe Volvo? <p>I read all the replies, and I guess it doesn't look very practical, so will have to think about keeping the 940 n/a instead of selling it.<p>The tough question for me now is, where do I keep it for 12 years? <IMG NAME="icon" SRC="http://********************/smile/emsmile.gif" BORDER="0"> <br>
 

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Re: 850 turbo "detuning" (BostonBrick)

You can't lower the boost below standard actuator boost level which still would be 0,5 or 0,6 bar.<br>This can be tested by connecting the wastegate actuator straight to the compressor housing by removing the yellow and red hose from the solenoid and connect them with a small 4 or 6 mm piece of pipe.<br>Lower the wastegate pretensioning and put a heavy spring on the throttle pedal <IMG NAME="icon" SRC="http://********************/smile/emsmile.gif" BORDER="0">
 

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Re: 850 turbo "detuning" (Johann)

its pretty easy guys <IMG NAME="icon" SRC="http://********************/smile/emsmile.gif" BORDER="0"><p>just make the gas padel very thick on the bottom so you limit how much you can rev it.
 
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