M20 Turbo => M50 turbo fun.
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Your logic is definitely sound.
It would be silly to try and say the M20 is a better engine than the M50 but I think the point at which my jimmies become rustled is when someone has an M20 in a poor state of tune (see also too cheap to hunt down vac. leaks and replace old parts) swaps in a junkyard M50 and pretends the M20 was a total un-fixable pile and the M50 is a rocketship, when in reality, a tune up would have likely yielded the same performance increase.
One thing to keep in mind about the M20, is that in NA form, it was a very highly optimized engine for its day. The LS1 is praised for being such an optimized engine with only 2 valves per cylinder, but when you do the math, the M20 has a specific output very close or equal to that of the LS1 (depending on the version of LS1) and that is with an archaic EFI system and relatively low compression ratio. Being reasonably optimized means that there is not a whole lot to gain unlike a 350 chev with 190 hp which gains 100hp with a carb, manifolds, and a cam.
So yes, the M50 is a more advanced engine, has more area under the torque curve, is more refined, and capable of making more power with less sacrifice down low, but the M20 aint a bad gig either, especially when the cost of replacement is so low, especially when your snail-obsession gets out of hand.
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if you are like this guy and know what you are doing
you could have yourself a reliable turbo m20 with little lag that screams on the track.
A turbo M50 will make a little more power with less boost than an M20 and might be the better choice if you want to keep the internals stock.
If it were me I would probably do the M20 just because I feel that if the heat of the turbo caused a cracked head or if the bottom end blew out, another healthy M20 engine could be dropped in for hardly anything.
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I never even caught your name!
Sent from the future. Or my phone, who knows.
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Lol, I don't know if that was a good thing or bad!
I'm set on the m50 turbo now, so have no fear!
Sent from the future. Or my phone, who knows.
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I'm a little late on this post but, a stock m20 with stock head gasket, ARP's, stock intake manifold, and hx35 12cm will easily give you 400+ whp (with a good tune)...
It's proven to handle 1 bar (350whp) all day long.
If you grenade it, no big deal.
Also, TB size doesn't really matter when FI. Most either o-ring or weld, m20's weak point is the head gasket pushing out into the coolant channel. Specifically cylinder #6 (hottest). Unless you plan on detonating, you wont get far.
GL with your new m50.
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M20 on a stock head gasket will not make 400HP, nor will one without built internals, they take a little bit of boost alright but they don't make much power per lb of boost.
Sent from the future. Or my phone, who knows.
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GunMetalGrey said:
M20 on a stock head gasket will not make 400HP, nor will one without built internals, they take a little bit of boost alright but they don't make much power per lb of boost.
Sent from the future. Or my phone, who knows.
Not trying to thread jack OP I'm also not sure if it's against the rules to link another forum but here goes...
Here is just one instance. I know he isn't using the stock head gasket but he is using shitty MB head bolts AND stock internals...93 octane.
Stock motor w/ 208k miles.
head was rebuilt @ 185k (valve job minor port cleanup stock cam/springs)
Metrick Blue bolts and Cometic MLS
boosted for over 20k.
437whp/380ftlbs on 20psi
http://www.e30tech.com/forum/showthread.php?t=112167
This thread has a couple turbocharged m20's (with dyno charts) slightly different setups. A lot of them have stock m20's pushing 400whp easily.
http://www.e30tech.com/forum/showthread.php?t=113066&highlight=m20+turbo+dyno&page=2
It's been done and proven...
Again OP, GL with your build.
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Nick_08 said:
Not trying to thread jack OP I'm also not sure if it's against the rules to link another forum but here goes...
Rules? What rules?
We're all about spreading the knowledge, thanks for sharing the links. Those are impressive numbers. Would like to see some videos of those cars in action. -
M20B27eta said:
Rules? What rules?
We're all about spreading the knowledge, thanks for sharing the links. Those are impressive numbers. Would like to see some videos of those cars in action.If you read BobRoss' thread he has plenty of dyno and street kill vids
. Here: http://www.e30tech.com/forum/showpost.php?p=1307822&postcount=65 -
M30 turbo>M20. Just saying. I know you got your M50 with big penor power. But either way.
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Brian said:
M30 turbo>M20. Just saying. I know you got your M50 with big penor power. But either way.
Dat shit cray
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Im totally not against m20's in anyway, and I'm totally open to constructive thread jacking. Thanks funny. I had an hx35 12cm and literally everything else to turbo my m20, but for some reason, I went m50. I think basically because for the future, I want to be making big power, and I think that the m50nv is a pretty good base to start? I also like higher revving engines. Welding my head+Oring was over 400$ at my machine shop. Not only that, but I had to pull the engine anyway, so why not buy an m50 for 300$? All i have to do is arps, and mls for a decent 400. I dont know. I'm not saying anyone was right or wrong.
sk8 or die
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