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01-14-2011, 05:51 AM
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#1 | | Ready to be Man handled by RS!
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| LS7 Into an M3...
There is a local car where the stock M3 V8 is ruined and needs replacement, and an LS7 (for those who don't know, it's the 505HP V8 from a Corvette Z06) is one possibility being considered.
Opinions? Should he do the swap?
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01-14-2011, 06:06 AM
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#2 | | My dinner reheated before my turbo spooled
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Why shouldn't he? Go for it! Sounds like a neat swap! Good luck!
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01-14-2011, 06:41 AM
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#3 | | OMGWTFBBQ is a common word I say everyday
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sure
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01-14-2011, 08:23 AM
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#4 | | F**K YOUR HEAD
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It makes a lot of sense in the long run will probably save him a lot of money
. Go big or go home ls9 ftw  Posted via RS Mobile | |
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01-14-2011, 08:27 AM
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#5 | | hot rod waggin'
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LS9 FTW  
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01-14-2011, 08:32 AM
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#6 | | My homepage has been set to RS
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if you plan to keep the M3, makes sense, best way to get 500hp. However, resale will be poor.
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01-14-2011, 10:05 AM
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#7 | | nuggets mod
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You should only go for it if you're going to keep us posted with pics!
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01-14-2011, 10:11 AM
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#8 | | Banned (ABWS)
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| Quote:
Originally Posted by Z3guy  if you plan to keep the M3, makes sense, best way to get 500hp. However, resale will be poor. |
well he can always sell it to a chick and her brother who doesn't know anything about cars. Just don't mention about the engine swap.  | |
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01-14-2011, 10:49 AM
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#9 | | I Will not Admit my Addiction to RS
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LS7: 505 hp at 6300 rpm and 470 lb·ft at 4800 rpm 7000 rpm redline 460 lb
S65: 414 hp at 8300 rpm and 295 lb·ft at 3900 rpm 8400 rpm redline 445 lb
even with improved "old" technology engine, on paper the ls7 sets the example that the bigger it is, the better it should be, however have you driven a Z06 before? 427 cu inch engine does not rev easily even with its forged titanium internals. To me I don't believe total power is the answer to everything, but it is the balance of the engine that makes the character of the vehicle. swapping the LS7 in would not be cheap either. your not going to find a LS7 laying somewhere in the junk yard and if you do find one, it will cost you about a leg or about $13K just for the motor, not mentioning the labour involved for custom engine, tranny mounts, drive axles, harness, bodywork, etc. What can you build with $13K into your S65 motor? most likely it will meet your LS7 power goals. http://www.bmwclubuae.com/forum/showthread.php?t=3901
hmmm I guess I'll go with the S65. also note your resale value will be horrible with a LS7 engine swap.
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Last edited by mpr; 01-14-2011 at 10:55 AM.
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01-14-2011, 11:06 AM
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#10 | | Ready to be Man handled by RS!
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This is in a race car. An LS7 new with tranny would cost same as the M3 engine alone. Mounts are easy to weld up and making a driveshaft from the new tranny to mate with the diff would also be easy. Engine runs on a Pectel ECU so no problems making it work with the LS7. And the LS7 tuned would be 600HP whereas a tuned M3 barely makes more than a stock M3 since it's so highly tuned from the factory.
Then there's the reliability factor.. Posted via RS Mobile | |
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01-14-2011, 11:14 AM
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#11 | | I contribute to threads in the offtopic forum
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stellar idea!
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01-14-2011, 11:18 AM
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#12 | | I Will not Admit my Addiction to RS
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dangonay: should of stated in your first post that this is for a "race car".
As a race car, there shouldn't be thoughts about resale value or emissions. all you would care is if you will win and how fast per lap can you do. Even though the cost will be negligible however if you are really thinking of putting the LS7 in, I'll recommend you to reconsider a LS2 or LS3 engine. building the LS2 will significantly reduce your "race car" build cost and with some work will also meet your 600 hp goal and probably more. Then again the owner may not have budget ceilings. It's good that he'll save alot on the other stuff when you do fabrication in house.
but most importantly, (not understanding what kind of racing you do ) have you read your rule books and what class are you going to run in? are you sure LSx engine with M3 platform is the ideal car to run in the unlimited class? food for thought.
Also, the "tuned" 600 hp LS7, can you define that abit more? I would assume running in umlimited class, you can do alot more than mild cams and heads. also buying a $13K LS7 is additional cost where as the owner already has a M3 engine in his garage (he just need to rebuilt it).
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Last edited by mpr; 01-14-2011 at 11:30 AM.
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01-14-2011, 11:19 AM
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#13 | | Head of HR....have a seat on that couch
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| Quote:
Originally Posted by mpr your not going to find a LS7 laying somewhere in the junk yard and if you do find one, it will cost you about a leg or about $13K just for the motor | $14k brand new from GM, complete. I've seen built ones go for $8k used and complete swaps, with the tranny, wiring, etc. for $6-9k.
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01-14-2011, 11:46 AM
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#14 | | I Will not Admit my Addiction to RS
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Yeah. it is just estimated number. the problem is not the number, but finding $8-9K cdn used LS7 in a good running condition.
$13,625 usd for the new crate + shipping + tax. 
I've seen used ls2 engine for $4-5K cdn. and it is available when you look around. Quote:
Originally Posted by fliptuner $14k brand new from GM, complete. I've seen built ones go for $8k used and complete swaps, with the tranny, wiring, etc. for $6-9k. |
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01-14-2011, 11:46 AM
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#15 | | Ready to be Man handled by RS!
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Can't rebuild an engine that has a piston through the block. 
This isn't my car, it's a customers. Just throwing around a few ideas right now and no decisions have been made. Posted via RS Mobile | |
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01-14-2011, 12:01 PM
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#16 | | I *heart* Revscene.net very Muchie
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LS7/9 will NEVA LOSE!
P.S. do you still have your 400+hp B5 S4? I remember reading your build thread from like 5 years ago.. LOL
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01-14-2011, 12:59 PM
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#17 | | RS.net, helping ugly ppl have sex since 2001
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how is the engine ruined?
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01-14-2011, 12:59 PM
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#18 | | they call me the snowman
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what about the large BMW motors, like an older 12 cylinder?
That would make a 3 series scream!
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01-14-2011, 01:06 PM
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#19 | | Head of HR....have a seat on that couch
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| Quote:
Originally Posted by dangonay Can't rebuild an engine that has a piston through the block. | Quote:
Originally Posted by shenmecar how is the engine ruined? | 2 posts above yours. 
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01-14-2011, 01:52 PM
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#20 | | First to fail !SG evar! Now i have yellow fever...
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Swap sounds like a nice idea. Is the bmw V8 not covered under warranty?
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01-14-2011, 01:53 PM
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#21 | | RS.net, helping ugly ppl have sex since 2001
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| Quote:
Originally Posted by Redlines_Daily Swap sounds like a nice idea. Is the bmw V8 not covered under warranty? | If it's used in racing activity you are sol. 
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01-14-2011, 02:57 PM
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#22 | | Wanna have a threesome?
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Originally Posted by originalhypa what about the large BMW motors, like an older 12 cylinder?
That would make a 3 series scream! | I was going to say go with an m70, I've actually been researching swapping one into an E30 for a little while now. If budget isn't an issue though I say go with an s65 for the power, weight balance, availability of parts, technology.. and I saw one on craigslist for $10k not long ago.
Whenever someone swaps an engine from one manufacturer into a different manufacturers chassis it bugs me, it takes away from the cleanest and purity of the car. Quote:
Originally Posted by Redlines_Daily Swap sounds like a nice idea. Is the bmw V8 not covered under warranty? | I think the warranty would have been voided by whatever caused a piston to shoot through the block, thats not exactly possible under stock conditions lol
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01-14-2011, 03:27 PM
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#23 | | Ready to be Man handled by RS!
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Looked at other motors. The guy who tuned this engine is the same guy who did the first ever BMW V10 aftermarket tune. That engine, some may remember, went into an E30. It's hella expensive and in the end makes the same HP as an LS7. Posted via RS Mobile | |
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01-14-2011, 04:53 PM
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#24 | | Willing to sell body for a few minutes on RS
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I get a laugh at the "old technology" comments, I assume that is in respect to some perception that overhead camshafts are some sort of "new technology".
Overhead cam technology dates back to the 1920's...
The first modern pushrod V8 dates back to 1948.
One is not better than the other. It's not difficult to make pushrod motors rev to 9 grand. Strong block, light rotating assembly, solid lifters and strong valve springs.
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01-14-2011, 04:54 PM
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#25 | | Rs has made me the woman i am today!
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Dont be shy now what are you really trying to say? German engineering isn't reliable? Quote:
Originally Posted by dangonay This is in a race car. An LS7 new with tranny would cost same as the M3 engine alone. Mounts are easy to weld up and making a driveshaft from the new tranny to mate with the diff would also be easy. Engine runs on a Pectel ECU so no problems making it work with the LS7. And the LS7 tuned would be 600HP whereas a tuned M3 barely makes more than a stock M3 since it's so highly tuned from the factory.
Then there's the reliability factor.. Posted via RS Mobile | | |
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