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[Sam]

My 2i 8v jobby used to comfortably hit 120mph on a flat a while back,

Now it tops out at only a ton! !

Since then I have added a K&N induction kit and I dont belive its been the same since...

The obvious reason i thought, was this is due to the fact that i havent pumped up the fuel mixture since adding the K&N.

Looked in haines manual found out how to change the fuel pressure not even being sure if this is what i want to do, but i thinks I would give this a crack.

Turned it out 1 and a half turns, then proceeded to boot it along the much controversial Newbury Bypass and had to under take a few cheeky gits that didnt realise i was doing a road test and had to boot it.

N E ways...

Same! !

Well it did get to neat 120mhp but that was down hill same on flat....

So I turn it some more, 1 more full turn in the same direction

Went for another booting...

SAME! !

And there was signs of the car juddering, blah

So i turn it back in, and in even more than it was to begin with,

Havent fully tested this as I was fast runnin down my tank by this point!

If u can be arsed to read all this I will like some advice on what the hell is going on here, and what I should do.

Chers.

[Canwell]

take off ur induction kit mate and make sure the mixture is back to where it was, then see if your prob is still there, it mite not be anything to do with the K&N.

[Project]

What else has been changed on it?

Brakes binding?

Have you changed the plugs and leads? Cleaned the filter?

Do what Mr Canwell said though and try removing the K&N first, although the mixture should be set up properly using an exhaust gas probe - 1.5 turns of the fuel regulator is a helluva lot and will either choke the engine or flood it.

[Sam]

Yea the plugs and leads where changed not so long ago, could that be the course?

I'm not quite sure what brake binding is so i probably havent done it!

U talkin bout the fuel filter or sommin? The air filter is still relitivly new but i guess i could give it a clean.

Well I was tampering with the fuel pressure i think i dont know if thats the same thing as the fuel regulator but it didnt seem to be making much different and i was turing it more than 1.5 turns.

When I get some time I will try taking the K&N off, but if this is not the prob then what could be causing it to top out so soon? I guess there are a few reasons why it could be but apart from top speed the car seems to be running fine on acceleration and everything.

[Canwell]

Do what Mr Canwell said

thanks, Mr Project

[Gozza_RS]

Brake binding, when the brakes caliper seizes causing continous brake pad to disc contact.

You will know when you have it as the wheels will get hot and have more brake dust on one than the other !!

Also cant believe you were testing your car on that private, deserted, unoccupied landing strip again

[Sam]

Humm very interesting, come to think of it I have noticed more than the usual scrapping sounds coming from the front wheels especially when turning hard and stuff, I thought it was just the 15" generally being too big for the car but I’m not so sure now as I’m sure its increased just recently.

And also I have noticed like dust on the front left hand tire before now but I thought it was just from when I was driving in gravel?

AND,

When breaking, particularly from high speeds the vibrations though the steering wheel are, well quite powerful so could that mean anything?

Sounds like I should definitely have this checked out, cheers ppl.

…. LOL Gozza_RS u know it

[Gozza_RS]

If when breaking you get a vibration then it is possible your discs have warped and become buckled. They will need replacing.

Sounds like it is time for a break overhaul matey !!!

[Sam]

ahhhhh fak just spent a woppin 650 squid on new gearbox and clutch so i really could do without this .

Does look that way init well its in for its MOT next week so I see what comes out of that,

cheers.

[285Andy]

i dont know for sure but is it possible that [ERRR] you got a new g/box that the speedo drive might be wrong thus thowing out ya indicated speedo reading up the top end?????????????????

just a thought but im probably pizzing in the wind

what are the revs at when the car is topping out mate????

[oli]

back to Sams question
i have the same sort of problem but on a 1.1i, with the normal filter and airbox it will EVENTUALLY accelerate to 95-100 on the flat, but with a K&N bolt on jobbi it only accelerates to 80 and wont budge past??? It does get there quicker thou

[Sam]

Intresting point 285Andy neva crossed my mind that one, I don't think that is the course but nevertheless its a good point and is worth keeping in mind.

I'm not really sure what the revs are when it tops out I didn't really look round the 5k ish mark I think but I would have to check that.

Yea oli I feel your pain it sucks dosen't it, get your motor tuned like i'm gonna hav too!

[MikeyXR2i]

Sam, further up you mentioned something about tampering with fuel pressure, if this has changed car will not run right atall. get it checked m8.

[Sam]

yea cheers Mikey ive been told that it should not be changed without a pressure gage, hence im getting in re-configured today with one. I'll remember not too do that again!

[grahamb]

For the sake of your license, and the welfare of those around you, and your own neck of course, please get the car rolling roaded!!!

[Mr Jungle]

iNDUCTION kits are wan k on N/A car's, best left for highly tuned and turboed beastys

[Sam]

okie grahamb chill man,

im on it, im on it, i promise

as a matter of fact ive had it on the rolling road today, not sorted yet but it will be.

That may be so Mr Jungle but if nothin else it does a make sweet ass tune when accelerating

[grahamb]

Good man. Don't want you crashing in to any trees whilst you're concentrating on the speedo!

[Sam]

lolz thanx for being concerned about me m8,

its nice to know someone cares

[tockwell]

or craching into any signs

[zeteclad]

Am having the same problem on a 1800 16v zetec. Revs are around 4k when topping out at 100mph

Have a green cotton induction kit, oil etc has recently been changed.

Any idea's?

[heeman10]

Dead CAT.

[Oranoco]

It's an 8v mate so no Cat.

Take it to a tuner as you have now dicked about with the fuel pressure reg and chances are you will now have it miles off where you need it. While they rectify your tinkering they should also be able to advise how the car is running and how best to sort your problem.

My old 2i and my mums current one both pulled past 100mph no problems so something is amiss somewhere.

[nearly17]

I think he was replying to zeteclad

[heeman10]

I think he was replying to zeteclad

Bingo 4,000rpm and brick wall - probably a blocked cat!

[Oranoco]

I think he was replying to zeteclad

Bingo 4,000rpm and brick wall - probably a blocked cat!

Smart aRSe

I see now.

[zeteclad]

Are there any additives you can add to the fuel to help clear it?

[Oranoco]

If the Cats dead mate all you can do is put a new one on. They're pretty cheap nowadays though

[xmadxmoex]

youll actauly loose some top end if you put an induction kit on your car...

with standard gear ratios anyways think of it like this...

acceleration-----------[]----------top end

you can only move the [] one way or another way with standard gearing etc... and as youve gone for an induction kit you will have gained acceleration but lost some top end so your car will look a bit more like this

acceleration-------[]--------------top end

and to gain both... you have to make the [] wider

if that makes sence?

[heeman10]

Well that's an interesting theory!!

[xmadxmoex]

its what ive been led to believe, you can increase one at expense of the other... with most performance mods.. one of the few ways to get both is to play with gearing ratios..

i may still be wrong though

[Priezti]

and when ever you make one component better/stronger you make another weak link, joys of tuning

[wildheart]

Am having the same problem on a 1800 16v zetec. Revs are around 4k when topping out at 100mph

Have a green cotton induction kit, oil etc has recently been changed.

Any idea's?

Cat or Air flow meter.

[Big Walker]

Think that might be why my Si stopped at 113 ?

so it'll go faster with a straight through ?

still had about 2K rpm or near that left, poor engine was between 100 and 115 for about 23 miles

[edders]

thats odd my brothers 1.3 hcs has a k&n and hes never had any kind of problem with a top speed drop if any thing it was a tad quicker

not much but it was there