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Performance Modifications for the NG900 / Old 9-3 This forum contains PERFORMANCE related Q&A's for the NG900 and 9-3. This may also include suspension.

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Old 05-30-2009, 11:31 AM   #1
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b234r viggen

okay im going to be picking up a b234r for my car. im wondering if i use the bottum end off the 234 and use the head and all other parts off the vig, if the my stage three tunen will be okay? will i need a custom tune because of the heavier rotating assmbly. i do have future plans for this engine other than the current tune (gt30/hx40) not sure yet though...
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Old 05-30-2009, 11:46 AM   #2
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That R is killing me man! R designates the turbo and the software, all 1994-1998 B234 blocks are the same. Nothing special about the "R"

But yes, use your T7 head and all other other stuff from the B235 motor (timing cover, ancillaries, etc)
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Old 05-30-2009, 02:32 PM   #3
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I am half way through this process... I wish there was a detailed write up to go off of... ive done a few motors swaps but this one makes me nervous... I think its because the the t5 to t7 interchange...
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Old 05-30-2009, 04:15 PM   #4
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Im in the middle too. I should be putting it back into the car tomorrow since we finally got a spare day to work on it. BUT then I still need two rubber CV boots for the passenger side before we can drive it.

Just use the T7 oil pump / timing cover... T7 oil pan, T7 head with the B234 gasket I guess to match the pistons, and use ALL of the exterior T7 stuff like the accessories and intake/ exhaust manifolds. What are you questioning?

I guess I am used to the trial/ error part of things but this seems like a sure fire no problems swap to me.
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Old 05-31-2009, 11:10 AM   #5
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haha well i guess i will drop the R from now on . well i guess i will use the block and rotating assmbly off the 234 and the rest off the 235. sounds simple, what gaskets should i use for the head gasket? block side? i cant wait to hear how yours runs now that you got it in
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Old 05-31-2009, 11:11 AM   #6
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maybe this is a stupid ? but i work on construction equipment not saabs most of the time but what do you mean by ancillaries? kinda a newb to this
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Old 05-31-2009, 11:52 AM   #7
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maybe this is a stupid ? but i work on construction equipment not saabs most of the time but what do you mean by ancillaries? kinda a newb to this
alternator, water pump, PS pump, AC compressor, etc.
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Old 05-31-2009, 12:24 PM   #8
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I guess I am used to the trial/ error part of things but this seems like a sure fire no problems swap to me.
Right. It's hardly a swap in the sense that the two motors are nearly identical. VERY straightforward.
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Old 05-31-2009, 06:38 PM   #9
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alternator, water pump, PS pump, AC compressor, etc.
ok thats what i was figuring. thanks
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Old 06-01-2009, 07:53 AM   #10
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use a b234 head gasket.
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Old 06-01-2009, 08:06 AM   #11
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haha well i guess i will drop the R from now on . well i guess i will use the block and rotating assmbly off the 234 and the rest off the 235. sounds simple, what gaskets should i use for the head gasket? block side? i cant wait to hear how yours runs now that you got it in
i have a shit ton of 205/235 covers and such just let me know what ya need so we can have the motor all set up before we do the transplant and i will hook ya up dare bub

also while we're in there lets get rid of the junky 2piece intake manifold.

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Old 06-01-2009, 12:58 PM   #12
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well first i want to start with getting the engine in the car. i plan on putting a clutch, flywheel, slave, and do some minor cleanup porting on the manifolds and head if needed. once its running i will worry about more power and how im going to tune. im starting with the basics
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Old 06-01-2009, 04:26 PM   #13
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i have a shit ton of 205/235 covers and such just let me know what ya need so we can have the motor all set up before we do the transplant and i will hook ya up dare bub

also while we're in there lets get rid of the junky 2piece intake manifold.
x2 those are dumb, why doyou need watercooled injectors!
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Old 06-01-2009, 04:38 PM   #14
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i should hook up the w/m for a week or so, so i can get that nice steamed head.

should i change intake manifolds? will that do anything for me power wise?
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Old 06-01-2009, 04:43 PM   #15
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the t5 intake manifold wont fit on the t7 head. so no, you should use the viggen intake manifold.
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Old 06-01-2009, 05:09 PM   #16
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1 piece b235 intake..... not T5!
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Old 06-01-2009, 05:55 PM   #17
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yeah didn't they come on the later viggens? maybe i can get my hands on one
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Old 06-03-2009, 09:12 AM   #18
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A few notes on the swap:

To switch the dip sticks you must pull out the pressed in fitting on the B234 block. Just get some plyers and dig in. Its helpful if you do it before fitting the T7 oil pan so you can still access it from the inside. Be careful not to scrape up the walls too badly. We then installed the T7 dip stick. It slides right in. To insure we had a great seal we used some copper based gasket maker.

When you have everything off the blocks on the back there will be one sensor on one spot on the B234, and one at another spot on the B235. Basically you want to remove the T7 sensor and place it at the same spot on the B234 where currently it only has a bolt plugging it. Then pull the sensor from the B234 and plug it with the bolt that came from the other hole.

On the surface of the B234 block where the head sits there is 1 guide pin that must be pulled out before the T7 head will be able to be mounted. Again just use some plyers and yank it out.

Other than that everything goes perfectly. I cant think of any other differences that we encountered.
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Old 06-03-2009, 12:01 PM   #19
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nice nice thanks a bunch for the tips. picking up the engine tonight, so i got to start collecting some parts. i think i am also gunna delete the balance shafts but not sure yet.
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Old 06-03-2009, 11:31 PM   #20
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yeah i did.
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