ok i got this chip with a receipt off the guy i bought the car off, thing is how do i tell if its actually for my car, ?? pic of it below

i dont think u can tell just by looking at it

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no way to tell i dont think from there, you can put it into the ecu in the passenger footwell by taking the black cover off the ecu bottom and plugging it in

No you can't tell from looking at it, plug it in and see.

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Tied

what exactly will it do if its wrong, ??

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well it pops and bangs and jerks when i take foot of gas, hard to tell as i dont have a lamba lol

Yep sounds like its working, thats what it did with mine, does it feel a bit more urgent?

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Tied

yeah but as i take the foot off it jerks forward, also im limited to 4500 rpm, but that may be due to my lamba sensor, ill let you know when someone gives me one

The sound of my Si with the superchip working, dunno where its ended up these days

Ok its sorted now, was because the lamba i was running was off an escort GTI, luckily found an Si at the local scrap yard

does it make much of a difference?

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Understeer: when you hit the wall with the front of the car.
Oversteer: when you hit the wall with the back of the car.
Horsepower: how fast you hit the wall.
Torque: how far you take the wall with you.

yeah you can tell with the throttle, but sometimes i get what i like to call the popcorn effect from my exhaust when taking my foot off

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fifi

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fifi