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Car Forum / BMW Cars / May 2004Thanks guys! More torque in an E39 520i
Thanks for the assistance guys! Of course bigger engines have more torque than mine's 190 Nm... But, as our fellow Dave Plowman wrote, since one way of getting more torque is to alter valve timing, and since VANOS is about variable valve timing, I was wondering if there was a BMW approved program for it. Is there a way to know the version of the ECU? I'm not sure if mine's the Siemens MS 41.0 or the 42.0... Thanks again, v 99 E39 520i > From: "Jim" <j.n@nospam.com> > Organization: SBC http://yahoo.sbc.com > Newsgroups: alt.autos.bmw > Date: Wed, 05 May 2004 17:22:46 GMT > Subject: Re: More torque in an E39 520i > > It is highly doubtfull as BMW really designs their engines for maximum > horsepower. You can't get both high low speed torque and high high speed > horsepower. > > The usual method to accomplish this is by a revised cam grind (much more > than merely tweeking VANOS). And, if you really really want more torque, > you need a different kind of car. > > Jim > "Vasco Ricardo" <vricardo@mce.iol.pt> wrote in message > news:BCBEB8B4.29D14%vricardo@mce.iol.pt... >> Hello! >> >> Is there an electronic BMW approved modification to get more torque from > an >> E30 520i? I know that the tuning guys can do it, but I'd prefer a BMW >> approved intervention... >> I'm not a mechanic expert but I guess it might be possible to get the 2nd >> set of the DoubleVanos system to open a bit earlier. >> What do you guys think? Anyone with experience in this kind of >> interventions? >> >> Thanks, >> >> v >> >> 99 E39 520i > Thanks for the assistance guys! > [quoted text clipped - 5 lines] > Is there a way to know the version of the ECU? I'm not sure if mine's the > Siemens MS 41.0 or the 42.0... BMW never approves engine mods, but what you're describing is the function of an aftermarket chip such as Conforti or Dinan. They simply change the tunable electronic engine characteristics to make better use of high octane gas, perhaps also raising the rev limiter a bit. They tend to focus almost entirely on peak HP and quarter mile times, rarely is there appreciable benefit for torque. As was said previously, torque tends to be helped only by forced induction or more displacement. There's no free lunch there. Valve timing can be used to get more torque but in a VANOS motor those gains are not on the table, they're in the motor, which was the whole point of VANOS already. -Russ. > > Thanks for the assistance guys! > > [quoted text clipped - 18 lines] > are not on the table, they're in the motor, which was the whole point of > VANOS already. One other point about VANOS: It is a binary system. Either the timing is advanced or retarded. There is no in between. The only way I could imagine to get more retarded (which I think is the direction you would go to improve low-end torque) or advanced (which would favor high end HP) would be to move the timing chain one tooth on the sprocket. When the VANOS activates ( the exact rpm it happens is controlled by the ECU) it shifts the valve timing a set amount, which is fixed by the mechanism of the male worm gear on the camshaft end and female worm gear inside the cam sprocket. All in all, a blower would be lots easier. -Fred W > > > Thanks for the assistance guys! > > > [quoted text clipped - 34 lines] > > All in all, a blower would be lots easier. They can do it by delaying the electronic spark by a tiny interval I believe. VANOS was binary back then but the newest versions are variable now aren't they? Anyway as you point out we're talking about modest gains over stock on this sort of engine, and a blower would be a lot easier way to go. -Russ. > Anyway as you point out we're talking about modest gains over stock on this > sort of engine, and a blower would be a lot easier way to go. > > -Russ. Just you'll lose *some* low end torque by driving the compressor. It'd probably be cheaper to buy a bigger engined 5-series than a (new) supercharger anyway. Dunno if anyone has mentioned it but if you want a quicker pull-away then you can fit a shorter final drive. I'm sorry but my english is not so good as I would like it to be... :-) What is a "shorter final drive"? Thanks, v > Just you'll lose *some* low end torque by driving the compressor. > It'd probably be cheaper to buy a bigger engined 5-series than a (new) > supercharger anyway. > > Dunno if anyone has mentioned it but if you want a quicker pull-away > then you can fit a shorter final drive. |
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