# scion tc or civic si??

**URL:** <https://forums.speedlife.net/t/scion-tc-or-civic-si/185946>\
**Category:** PittSpeed Automotive\
**Created:** [October 30, 2006, 9:30pm UTC](https://forums.speedlife.net/t/scion-tc-or-civic-si/185946 "2006-10-30T21:30:45Z")\
**Posts on this page:** 1\
**Showing post:** 36

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**Author:** ![Hycomp](https://avatars.discourse-cdn.com/v4/letter/h/d6d6ee/32.png) [@Hycomp](https://forums.speedlife.net/u/Hycomp)\
**Post date:** [October 31, 2006, 12:56pm UTC](https://forums.speedlife.net/t/scion-tc-or-civic-si/185946/36 "2006-10-31T12:56:38Z")

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> [@Low to Mid 40's next week!!! W00T!!!](https://forums.speedlife.net/t/low-to-mid-40s-next-week-w00t/25488/5):
>
> clutch type lsd’s suck…they wear out and u have to add additives to your gear oil
> 
> oh well…
> 
> and the SI motor is already at high compression and pretty maxed out. i’m sure bolt ons may gain alittle more power not a whole lot more. just like the rsx, its already pushin good power in stock form which is great for a small 4 cyl. you probly only gonna get 10whp outta it with better exhaust and tune… maybe 15 if ur lucky which is a nice gain, but for the cost in parts it doesnt seem worth it
> 
> being high compression u really cant boost it much.
> 
> i havent heard jack on the s/c TC motor tho…so who knows what it can hold

The LSD in the SI is a helical unit so the wear issue is not an issue. I’ve seen at least one magazine drop their TC project car due to lack of an LSD as well as lack of aftermarket alternatives. Also there is a ton of bolt on NA and boost parts available for the newer honda K-series motors which are commonly producing 230-280 hp NA to 300+ easy with mild boost. The new K motors start out almost like a fully modded B-series motor (big bore, high flow head, massive main girdle).

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