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Old 09-22-2017, 09:05 PM   #1
getouttamyway
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Default California smog and +T?

I found a donor 1991 940SE to turbo my 1990 240. Still doing the research on the swap, but wondering how to navigate smog in California. I was assuming I would do the full swap then do the BAR ref thing (which I've never done), but doing a +t might actually be less work I'm just not sure how to deal with the smog then.
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Old 09-23-2017, 11:01 AM   #2
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I would just put the turbo engine in, keep the stock block for backup, and smog referee it. They will check the numbers on the cat.

Engine must be same year or newer. Can't add a turbo to an engine, technically, but I doubt they can find the year stamp behind the engine mount.
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Old 09-23-2017, 11:18 AM   #3
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Move out of the smog zone/CA?
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Old 09-23-2017, 11:21 AM   #4
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Why make it so difficult buy a factory turbo car and drive it?
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Old 09-23-2017, 11:29 AM   #5
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The +t may work but most likely not. Get a complete engine out of a 91+ 940 turbo and swap it in along with all the emissions components and you'll be fine
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Old 09-23-2017, 12:46 PM   #6
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Right on I have the complete donor car on my driveway. It sounds like that might be the most straight forward approach.
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Old 09-23-2017, 12:47 PM   #7
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Why make it so difficult buy a factory turbo car and drive it?
Because I love big window 245's and I need a car fast enough to at least get out of its own way.
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Old 09-23-2017, 12:55 PM   #8
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I do just fine with my stock N/A cars and a T-cam Just run 3:73 rear or higher, and just drive with a heavy foot.
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Old 09-23-2017, 01:03 PM   #9
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I do just fine with my stock N/A cars and a T-cam Just run 3:73 rear or higher, and just drive with a heavy foot.
Last fall we took ours on a 7 day 2,000 mile camping trip. Fully loaded climbing mountain passes was really slow going. Some interstates had 80mph limits and we could only push 50. My other car is a m3 so it was really frustrating. After that I began the hunt for a good donor car...
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Old 09-23-2017, 02:05 PM   #10
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Because I love big window 245's and I need a car fast enough to at least get out of its own way.
Then buy a 245 Turbo like I did.

They did make them you know.

A little kick when you need it and as much as 30mpg taking it easy on the highway obeying the speed limits.

Swap a 90+ hatch on the 245T if you insist on big windows.


Last edited by Redwood Chair; 09-23-2017 at 02:26 PM.. Reason: big windows
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Old 09-24-2017, 03:54 AM   #11
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I do just fine with my stock N/A cars and a T-cam Just run 3:73 rear or higher, and just drive with a heavy foot.
If you don't mind me asking, what size exhaust do you run with your T cam ?
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Old 09-25-2017, 02:04 PM   #12
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Then buy a 245 Turbo like I did.

They did make them you know.

A little kick when you need it and as much as 30mpg taking it easy on the highway obeying the speed limits.

Swap a 90+ hatch on the 245T if you insist on big windows.

I've seen the way you drive on the freeway......
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Old 09-25-2017, 02:17 PM   #13
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I've seen the way you drive on the freeway......
Was that you I passed on the side of the road the other day?

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Old 09-25-2017, 02:28 PM   #14
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Probably not
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Old 09-25-2017, 03:02 PM   #15
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ORLY did he write you a ticket or just give you a warning?
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Old 09-25-2017, 03:28 PM   #16
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I haven't gotten pulled over in years so I don't know what you are talking about.... Lol
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Old 09-25-2017, 03:38 PM   #17
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Last fall we took ours on a 7 day 2,000 mile camping trip. Fully loaded climbing mountain passes was really slow going. Some interstates had 80mph limits and we could only push 50. My other car is a m3 so it was really frustrating. After that I began the hunt for a good donor car...
Can you define fully loaded? Ive had my 89 loaded up and it did just fine in the mountains. The jump from 2-3-4 kinda sucks though. M47 car.
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The 'work around' is to find one in the junkyard like any true turbobricker, or beg in wanted, and go on down the road.

Or continue on with your car up on jackstands?
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Old 09-25-2017, 03:53 PM   #18
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Originally Posted by getouttamyway View Post
Last fall we took ours on a 7 day 2,000 mile camping trip. Fully loaded climbing mountain passes was really slow going. Some interstates had 80mph limits and we could only push 50. My other car is a m3 so it was really frustrating. After that I began the hunt for a good donor car...
why do M3 owners always bring up their car ?
I have two M3 complete engines
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Old 09-25-2017, 04:56 PM   #19
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Next year take the M3 and stay in motels, it'll be cheaper than a complete B230FT swap.
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Old 09-25-2017, 05:10 PM   #20
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or buy my e36 m3 engine or my e46 m3 engine and save me from doing a swap to a 240
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Old 09-25-2017, 05:31 PM   #21
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If you do +T there is no way to stick to the original N/A vacuum diagram without changes, so that will be a problem during smog test.
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Old 09-25-2017, 10:44 PM   #22
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If you don't mind me asking, what size exhaust do you run with your T cam ?
stock. You need the back pressure with a sub 100hp car.
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Old 09-25-2017, 10:48 PM   #23
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Originally Posted by getouttamyway View Post
Last fall we took ours on a 7 day 2,000 mile camping trip. Fully loaded climbing mountain passes was really slow going. Some interstates had 80mph limits and we could only push 50. My other car is a m3 so it was really frustrating. After that I began the hunt for a good donor car...
What rear end gearing is in your car? even with a turbo& all that weight, you arent gonna get anywhere unless you stay spooling.Then the turbo isn't gonna help you downshifting going downhill.

I went to Big Bear (8500')last summer in my 93'. auto trans, 3.73 stock rear and I was doing just fine.
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Old 09-26-2017, 12:57 AM   #24
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Tough crowd. I got a low mileage 940se wagon donor complete and running for $1100. Someone explain to me why I wouldn't want to do the swap?
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Old 09-26-2017, 01:07 AM   #25
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It makes more sense to sell both cars are buy a 245t 1985
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