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by **jingley123** on Mon Jun 18, 2001 6:31 pm

What engine modifications shall i make to my mk 3.5 1.6 SI 16v. I dont really want to spend anymore than £400. Ive heard that theres not much you can do to the SI as it was built as an economy "sports" car. Is this true? :cool:

by **zetec69** on Mon Jun 18, 2001 6:49 pm

Yep that's true mate! You can do a few things though but it'll never be a missile! You could get the usual chip,induction kit & exhaust system for about £550 or about £450 with just a backbox instead of full system but you won't get any extra power from a backbox. If u want it to go a lot quicker then you'll be best off putting a different engine in but then you're talking a lot of money unless you can do it yourself. I had a 16v Si, put an induction kit,exhaust system & superchip on it, realised I wanted a lot more power and so put an RS1800 engine in. It wasn't that expensive because I got the engine cheap out of a written off RS and fitted it with a mate. :wink:

by **Project** on Mon Jun 25, 2001 10:56 pm

69, why won't a back box add power? The main restriction in power comes from the s-bend baffle in the back box.

Yeah, a larger bore can help but prob not so much in a 1.6 zetec.

Oh well....

How about dropping a 2L lump straight in? :???:

by **zetec69** on Wed Jun 27, 2001 9:51 am

Who's gonna actually notice an increase in power from a back box??? It might add a little power and sound better but u ain't gonna notice it! :razz:

by **barneysi** on Wed Jun 27, 2001 6:29 pm

does anyone actually do just the back box for the 1.6si as all i have ever seen is the full system advertised from the cat back. :???:

by **Phil Si** on Wed Jun 27, 2001 6:33 pm

magnex

by **barneysi** on Wed Jun 27, 2001 7:08 pm

cheers, is that what u got, if so where from and how much mula?

by **Phil Si** on Wed Jun 27, 2001 7:25 pm

yeah ive got one on my Si. dont know the cost tho as it was on when i got it :grin:

bout 275 quid i think.. its great.. broooom :smile:

nice and shiny too. when its clean....

by **sunnyFRST** on Wed Jun 27, 2001 7:27 pm

best thing you could ever do to it would be TURBO engine! :wink:

Sunny

by **Phil Si** on Fri Jun 29, 2001 4:15 pm

yeah sunny in the furture i wanna get a 2.0L zetec and turbo it :grin:

but thats not till i get the money, which will be about 2 years :sad:

by **barneysi** on Fri Jun 29, 2001 7:55 pm

you u got a back box there. 275 is what u would pay for a cat back system, not just a back box.

by **Phil Si** on Fri Jun 29, 2001 8:01 pm

yeah its a full system i think
i aint 100% sure cos it was on when i got the motor :smile:

i'm sure rs bob will correct me tho :grin:

by **fiesta boy** on Sat Jun 30, 2001 9:15 pm

it's a full system with cat bye pass phil :grin:

by **Phil Si** on Sat Jun 30, 2001 10:36 pm

cheers mark i thought u'd know :grin:

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What Mods shall i make to my SI

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