240sx
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since its a 90, you will have to rewire some stuff under the dash to get the cluster to work, you will need 91+ S13 Power streering system, I dont remember about the wiring, you will also loose the ablilty to use a consult tool, you will also need a DOHC throttle cable, gaugecluster. the clip doesnt come with all of that stuff becuase it is RHD and stuff is differant, but it will make sure you get all the stuff for the SR swap. And I know I am forgeting something.
Research the swap on the 240 forums, there are multiple right ups.
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i have parts car that you can harvest off of for a price
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I just sold all the parts you would need for the SOHC to DOHC swap. and I mean everything. LOL.
BTW for the parts just for that swap(SOHC to DOHC), you would spend around $400, on top of the sr swap, some stuff from a clip can be used, but that depends on if you want have a KPH speedo... also its not easy to keep AC when doing the SOHC to DOHC swap, unless you have a complete system from a DOHC car, stuff from clip wont work LHD, VS. RHD.
As for the wiring, under the dash is easy. its not really wiring if you know what you have to do.
Also, is the car a 5-speed?
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me and a buddy of mine are thinking of doin the swap on his 90 240sx and we were wondering the same thing of how hard it would be
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Ya, price for a complete SR swap with no basics and doing the labor your self is pretty much over 3k. and then you need the FMIC, guages, exhaust, the basic tune up stuff..... pretty much prices are starting to through the roof.
its getting to the point where the d-town guys are actually charging for there KAs when they pull them(not expecting anyone but tony to get that)
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SLS is developing products for it right, now. not the sohc, the dohc. I have a dohc for sale, and you can get the 5-speed swap from Jeremy(how ever much you hate him or what ever).
IMO, start with a car with the motor you want to use. I didn't and sort of wish I did. I did the SOHC to DOHC swap and the auto-5speed(which is really easy.
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The popularity of the SR has led to such INSANE price increases in parts, motors, etc. It's WAY more economical to go with a KA or CA.
S13 blacktop half cut prices have increased upwards of $2k over the last 3 years. I remember when you could get one for under $2k. Nowadays, you're lucky to finish an SR swap that doesn't cost more than $4k from start to finish.
I'd rather go KA over SR as well.
But I'd also rather go CA over KA.

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