402 LS2 TVS1900 in a BMW
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TECH Resident
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Joined: Dec 2005
Posts: 980
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From: Naperville, IL
402 LS2 TVS1900 in a BMW Now for something a little different 
402 LS2, TVS1900 Magnacharger at 11 psi in a 98 BMW 540i
The goal here was stock like drive ability and as much torque as possible, it is not an all out "fastest car in the world" type of build. I use it as a daily driver
The shop didn't run the car to its 6500 redline (they only did the dyno, not any part of the build, which I did myself) - they were being very conservative so a larger HP number is there if I want to get on the dyno again, but I am not all that concerned with the peak HP number. The AFR numbers don't match up with the logs of my wideband - the car ran rich on the dyno in 4th, but runs spot on on the road in3rd (4th tops out at 150 so logging in 4th on the street isn't going to happen)
Here is a pic of the car (More pics in my build thread in my signature):
For the video hounds (no the guy in the car is not me) the car is very quiet until you open it up
- YouTube - 2011-04-20 - At the Dyno
Specs:
LS2 Block
Forged Stroker (mid level stuff, nothing fancy)- ~9.5:1 compression
Stock 371 heads with ls2 valves and ls6 springs
Ls2 cam
Exhaust is modified 98 f-body manifolds to 2.5" dual cats to single 2.5" pipe - the goal was as quiet as possible
Walbro 255 pump with a BAP
01 F-body T-56 built by RPM performance (this is the 3rd BMW this transmission has been in )
Ls7 clutch
402 LS2, TVS1900 Magnacharger at 11 psi in a 98 BMW 540i
The goal here was stock like drive ability and as much torque as possible, it is not an all out "fastest car in the world" type of build. I use it as a daily driver
The shop didn't run the car to its 6500 redline (they only did the dyno, not any part of the build, which I did myself) - they were being very conservative so a larger HP number is there if I want to get on the dyno again, but I am not all that concerned with the peak HP number. The AFR numbers don't match up with the logs of my wideband - the car ran rich on the dyno in 4th, but runs spot on on the road in3rd (4th tops out at 150 so logging in 4th on the street isn't going to happen)
Here is a pic of the car (More pics in my build thread in my signature):
For the video hounds (no the guy in the car is not me) the car is very quiet until you open it up
- YouTube - 2011-04-20 - At the DynoSpecs:
LS2 Block
Forged Stroker (mid level stuff, nothing fancy)- ~9.5:1 compression
Stock 371 heads with ls2 valves and ls6 springs
Ls2 cam
Exhaust is modified 98 f-body manifolds to 2.5" dual cats to single 2.5" pipe - the goal was as quiet as possible
Walbro 255 pump with a BAP
01 F-body T-56 built by RPM performance (this is the 3rd BMW this transmission has been in
)Ls7 clutch
You've seen my comments on BF but wanted to add something here. Run your 2.5" duals through your cats, an x-pipe, and through a BIG magnaflow muffler (or two) and you'll pick up a ton of HP without much noise. Quiet true duals on these engines with an X sounds as sophisticated as the Euro V8s. You can always add bullets if you need to tone down the noise further.
Again, this is a sweet build - a benchmark for conversions in many ways. Anxious to see what kind of MPGs you can squeeze out.
Again, this is a sweet build - a benchmark for conversions in many ways. Anxious to see what kind of MPGs you can squeeze out.
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Thread Starter
TECH Resident
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Joined: Dec 2005
Posts: 980
Likes: 1
From: Naperville, IL
Thanks for the comments
The exhaust is not going to be changed. There isn't room to run duals without cutting up the floor pan. Even if it was easy I wouldn't do it. I am happy to trade some top end for peace and quiet. I don't need my neighbors busting out the pitchforks every time I start the car.
When you build your you can use a wide open exhaust and see how much it gains
I get about 12.5 MPG around town and mid 20s on the highway.
I doubt it would fit under the hood. I'd stop by, but I don't recognize the place anymore
You've seen my comments on BF but wanted to add something here. Run your 2.5" duals through your cats, an x-pipe, and through a BIG magnaflow muffler (or two) and you'll pick up a ton of HP without much noise. Quiet true duals on these engines with an X sounds as sophisticated as the Euro V8s. You can always add bullets if you need to tone down the noise further.
Again, this is a sweet build - a benchmark for conversions in many ways. Anxious to see what kind of MPGs you can squeeze out.
Again, this is a sweet build - a benchmark for conversions in many ways. Anxious to see what kind of MPGs you can squeeze out.
When you build your you can use a wide open exhaust and see how much it gains
I get about 12.5 MPG around town and mid 20s on the highway.
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[QUOTE=rao;14908104]Thanks for the comments
The exhaust is not going to be changed. There isn't room to run duals without cutting up the floor pan. Even if it was easy I wouldn't do it. I am happy to trade some top end for peace and quiet. I don't need my neighbors busting out the pitchforks every time I start the car.
When you build your you can use a wide open exhaust and see how much it gains
I get about 12.5 MPG around town and mid 20s on the highway.
Ahh, I didn't realize you were so close to Chicago, now I understand the dedication to smog-**** avoidance. Rest assured though, you'd pick up a ton of power. Stock LS1s get 30-50rwhp (tuned) with headers and exhaust - and this is with cats and a real muffler. You'd get AT LEAST that much.
I'm very much against obnoxiously loud setups FWIW. This was my bone stock LS1 with ARH 1 7/8 long tube headers, cats, and good quiet y-pipe setup. It put down 342rwhp/356rwtq:
http://www.youtube.com/watch?v=tc9Aw...eature=related
This is the car with a cammed LS3, same exhaust and it did 465/432. It was quiet enough to hear the damn valvetrain over the exhaust, LOL:
http://www.youtube.com/watch?v=cTAXm...NCHCw&index=14
Here is inside the car, it was not loud in or out:
http://www.youtube.com/watch?v=kdPIt...=13&playnext=1
http://www.youtube.com/watch?v=Ey6cu...NCHCw&index=15
I just hate to see such an awesome build leave easy power on the table when you could do it and still easily keep the neighbors at bay. Not stock sound like now, but close.
Awesome build and a real heartbreaker, regardless, if you decide to sell ever, please PM me.
The exhaust is not going to be changed. There isn't room to run duals without cutting up the floor pan. Even if it was easy I wouldn't do it. I am happy to trade some top end for peace and quiet. I don't need my neighbors busting out the pitchforks every time I start the car.
When you build your you can use a wide open exhaust and see how much it gains
I get about 12.5 MPG around town and mid 20s on the highway.
Ahh, I didn't realize you were so close to Chicago, now I understand the dedication to smog-**** avoidance.
Rest assured though, you'd pick up a ton of power. Stock LS1s get 30-50rwhp (tuned) with headers and exhaust - and this is with cats and a real muffler. You'd get AT LEAST that much. I'm very much against obnoxiously loud setups FWIW. This was my bone stock LS1 with ARH 1 7/8 long tube headers, cats, and good quiet y-pipe setup. It put down 342rwhp/356rwtq:
http://www.youtube.com/watch?v=tc9Aw...eature=related
This is the car with a cammed LS3, same exhaust and it did 465/432. It was quiet enough to hear the damn valvetrain over the exhaust, LOL:
http://www.youtube.com/watch?v=cTAXm...NCHCw&index=14
Here is inside the car, it was not loud in or out:
http://www.youtube.com/watch?v=kdPIt...=13&playnext=1
http://www.youtube.com/watch?v=Ey6cu...NCHCw&index=15
I just hate to see such an awesome build leave easy power on the table when you could do it and still easily keep the neighbors at bay. Not stock sound like now, but close.
Awesome build and a real heartbreaker, regardless, if you decide to sell ever, please PM me.
