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Forum LockedMy car feels like a vtec???

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YODI 325 View Drop Down
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Direct Link To This Post Topic: My car feels like a vtec???
    Posted: 17-January-2004 at 22:18

My car doesnt seem to have much low down, its a 325sport. Ive fitted a K&N panel filter and drilled three holes in the airbox and thats the only mod, it seems toi cut in at about 4k revs.


Any ideas?

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kris td View Drop Down
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Direct Link To This Post Posted: 17-January-2004 at 22:44
dont they have variable valve timing like the v-tec engines anyway?
may be wrong, im new too bmw's
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Direct Link To This Post Posted: 18-January-2004 at 09:30

Dont think so mate, not on the e30's from what I know anyway

 

Yodi

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Direct Link To This Post Posted: 18-January-2004 at 23:15

No not on the E30.

All 325i's are like this, they seem to come on cam at about 4k, a nice chip can help flatten things out a little but you'll still find most of the power is above 4k. 

A sports exhaust, induction kits etc will make this much worse.  You say you have drilled the air box, did you keep the trumpet inside? That makes a good difference to midrange torque so keep it. 



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Direct Link To This Post Posted: 19-January-2004 at 00:28

Hi Paul,

 

I drilled three holes in the airbox on the front side about 1 inch in size each, I kept the trumpet also. I was going to do some tests with and without, whats your theory on this?

I was going to buy a chip but lost his contact details :(

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Direct Link To This Post Posted: 19-January-2004 at 13:28
The trumpet should stay. It was proven recently over at BMWe30.net that it enhances the mid range response.

The M20B25 has a very pronounced torque and power step at about 3500-4000 rpm.
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Direct Link To This Post Posted: 19-January-2004 at 13:57
What should the co level be and also the timing?

Cheers, yodi
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Direct Link To This Post Posted: 20-January-2004 at 14:15

Originally posted by YODI 325 YODI 325 wrote:

What should the co level be and also the timing?

Cheers, yodi

The ignition timing is looked after by the ECU as it is on most fuel injected cars, so this is set for life.  The timing can only be adjusted for performance reasons or other by changing the chip in the ECU.

The CO @ 3000rpm should be 1 +/- 0.5%.  A good setting generally is about 1.3 % CO.



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Direct Link To This Post Posted: 20-January-2004 at 15:20

Cant believe the difference, i went and did my co level today, it was on 0.3% on idle, its not at 1.4% and the car drives much nicer.

My exh manifold gaskets are leaking slightly too so I need to change them also and re-adjust the co again.

 

Cheers lads

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