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Old 04-03-2012, 04:25 AM   #16
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I've just heard horror stories about turbos killing the engine, although my same friend did turbo his M42. I'm really not looking for that much of a power gain, up to 175 max
Boring out aluminum engines kills them, too. Supercharging is your most cost effective bet in my opinion.
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Old 04-03-2012, 04:33 AM   #17
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as much as id love to supercharge it, I'm not really ready to drop the same money i spent on the car for a DASC
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Old 04-03-2012, 06:37 AM   #18
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as much as id love to supercharge it, I'm not really ready to drop the same money i spent on the car for a DASC
Whatever performance mod you do, it's going to cost you money. Turbocharging will give the best bang for buck, followed by supercharging, then boring out/stroking etc.

6 cylinder engine conversion will be your best option imo. It will give the least greif out of the above options. Then later if you want more power you can always go FI on the 6
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Old 04-03-2012, 01:26 PM   #19
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You could run a small nitrous kit for a 50hp gain.
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Old 04-03-2012, 03:45 PM   #20
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as much as i don't want to do an engine swap, i suppose it is the most practical solution and if i could find the engine from a 323, an M25B25 i believe, it shouldn't add too much weight to the front end, should it?
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Old 04-03-2012, 04:01 PM   #21
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The m42/m44 are not very difficult to bore despite what some are saying. I designed and blueprinted (but never finished due to distractions) a motor with S52 pistons. You can bore to S52 piston diameter easily. A 318i guy in south africa both bored and stroked his motor with S52 sized forged pistons and a M47 crank.

I sourced S52 pistons from a blown motor where 1 piston shattered but the other 5 were OK. Then I got the lining bored to fit and there was enough material still to go further if I wanted. I don't have all the specs since this was 3 or 4 years ago and I sold the motor. Essentially, you go up a little over 100 ccs and get around 10-15 hp.

Whether that's worth it is up to you. The full build required pistons ($100 for 5), new rod and main bearings ($200 or so) and boring at a machine shop which was around $300. Of course for this price you have to assemble yourself. Also you want new piston rings.
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Old 04-03-2012, 06:17 PM   #22
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The M42 and the 2 M44's I have are not aluminum blocks. What cars came with all aluminum 4 cyls? Z3?

I think what the OP needs is a 6 cyl swap. As for forced induction and motor swaps, that really moves you into some hardcore auto-x classes-like CP an XP. With cobra kit cars and other insanely quick and light cars.
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Old 04-03-2012, 06:22 PM   #23
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this is true, but i think I'm going to use my 325ci for auto-x and id really like to use the ti for driving schools
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Old 04-09-2012, 05:18 AM   #24
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Just a few weeks ago I started looking for a few fast easy hp mods. I think the car could use another 20hp. In the end I switched fluilds over to sythetics, rear end, oil. Gave it a new set of plug - bought the car used and they may of been origanals. And replaced the O2 sensor. The car feels like it has an extra 10hp over what she had before the tune up. I know this is sad and probably only puts her back to what she had from the factory. The more I drive the car however the more I enjoy it and am really thinking if the M division stoped at 240hp that may be right amount for the car and being as that 6 is a direct fit and used brings less money than what a rebuild will cost it may be the way to go. Yeah the added weight may be a downfall but the car will still be lighter than a factory m3 so should I complain?
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Old 04-09-2012, 12:20 PM   #25
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The bean counters stopped at 240, M division wanted 320.
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Old 04-09-2012, 05:06 PM   #26
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I've worked on a lot of car but will admit I'm new to the bmw thing. Is there a modern bmw powerplant making 320 that will just drop in? And what's that do to the handling? My '65 stang likes to brag about having 300hp+ but it does so in a bull in a china shop, smoke and rumbling exshaust fashion.
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Old 04-09-2012, 05:16 PM   #27
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I've worked on a lot of car but will admit I'm new to the bmw thing. Is there a modern bmw powerplant making 320 that will just drop in? And what's that do to the handling? My '65 stang likes to brag about having 300hp+ but it does so in a bull in a china shop, smoke and rumbling exshaust fashion.
if you're looking for 320HP from a newer BMW engine your best bet is the S54 from a E46 M3 or a M coupe/roadster. Thats gonna add a bit of weight to the front of the car so to balance that out you should move the battery to the trunk, get a CF hood etc. anything to balance out the weight that you added. But you should still have good handling. The catch with 300+HP is that you'll most likely need to change the diff, clutch, flywheel and even the driveshaft to handle that kind of power, theres now way a stock ti could handle that much.
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Old 04-14-2012, 11:04 PM   #28
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Ya the swap is most cost effective than anything followed by turbo and s/c but i agree the metric mechanics motor are awesome and one option since you do have friend that works on euro cars could look into buy one or two pieces at a time while your still your ti as is till you collect to all then pull it out have friend help put it together or im sure you can find plenty of others that could lend some help drive 325ci till motors finished since you have all parts shouldn't take too long at that point.
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Old 09-09-2012, 02:18 PM   #29
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Yes, what on earth M44 engine is alloy block?

I've only ever seen cast iron blocks and cannot find any literature on any M44 engines being cast as an alloy block.

All BMW 4 cylinder engines are cast iron util the European N42/N46 engines were introduced in MY2002 in the E46 Compact.
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