1.9 performance tips

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Beaker
Joined: Mon 03 Sep, 2007 21:23
Posts: 67

  Z3 roadster 1.9
Location: Glasgow

1.9 performance tips

Post by Beaker » Thu 25 Apr, 2013 19:25

I've got a 1.9 96/97 zed, it's really a bit slow, anything I can do about it?

I was looking at a chip, anyone tried these?
http://www.tuningwizard.co.uk/index.php ... cts_id=993

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ShayneJ
Joined: Fri 01 Feb, 2013 21:27
Posts: 40

  Z3 roadster 1.9
Location: Lambourn, Berkshire

Re: 1.9 performance tips

Post by ShayneJ » Thu 25 Apr, 2013 19:35

£65 for a box with a variable resistor in it to fool the ecu into thinking its cold to pump more fuel a la choke +40 BHP
yep an i have some magic beans for sale only £30 each with free tomato sauce :D
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Robert T
Site Admin
Joined: Mon 12 Jun, 2006 11:35
Posts: 10010

  Z3 roadster 1.9
Location: Cheshire

Re: 1.9 performance tips

Post by Robert T » Thu 25 Apr, 2013 19:39

Arctic Silver '99 Z3 1.9 & Black '59 Frogeye 1275cc
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Z3cade
Joined: Sat 09 Jan, 2010 18:18
Posts: 2634

  M roadster S50
Location: Peterborough

Re: 1.9 performance tips

Post by Z3cade » Thu 25 Apr, 2013 19:40

Don't waste your money.. 40bhp increase from a chip on a 1.9 is pure bull...

You could go for a real mapping session to get a better throttle response but you will never get big HP gains..

Other options would be to go for a cone air filter and free flow exhaust to free her up abit otherwise sell up and go for a bigger engine Zed.. Bit harsh but in all honesty it's your best option if you want more grunt.
///M Roadster - Evolve Stage 3
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TitanTim
Joined: Mon 23 Jun, 2008 19:56
Posts: 5488

  Z3 roadster 1.9i
Location: Stafford

Re: 1.9 performance tips

Post by TitanTim » Thu 25 Apr, 2013 19:47

Just put the hood down and forget about it unless your a budding Stirling Moss :wink:

Tim.
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2001 Z3 1.9 Roadster Sport - 2012 Z4 sDrive 2.0 M Sport

Del
Joined: Sat 19 Nov, 2011 18:35
Posts: 2122

  Z3 roadster 1.9

Re: 1.9 performance tips

Post by Del » Thu 25 Apr, 2013 20:12

Get a new set of “high power” plugs, nice new free-flowing air filter and replace the mass of old vacuum pipework on the M44 engine – it’ll fly afterwards. :lol:

Beaker
Joined: Mon 03 Sep, 2007 21:23
Posts: 67

  Z3 roadster 1.9
Location: Glasgow

Re: 1.9 performance tips

Post by Beaker » Thu 25 Apr, 2013 22:08

Ill take some magic beans thanks :-)

Cheers folks, part of me would like to change to a bigger engine zed but I've had my car since 14000 miles and it's really reliable. Better the devil you know, ive changed car in the past and ended up worse off. I also don't have the money to change car at the moment so I'm stuck with my 1.9.

I think all other changes are minimal but together might be just enough to keep me happy.

Can you folks link some sound products I can look out for??
Much appreciated

RichP
Joined: Wed 20 Feb, 2013 00:47
Posts: 190

  Z3 roadster 1.9

Re: 1.9 performance tips

Post by RichP » Fri 26 Apr, 2013 01:35

I've long accepted I won't be winning many drag races in my 1.9, I'd like more power, but like you I've had mine a few years now. I know it, and I'm rather attached to it. Any new one would feel unpredictable in terms of what might go wrong. Sometimes I'm grateful the lack of power keeps me out of serious trouble! :drive That and the magic button "asc". (Which I call the suicide button, or the "crash now" button). Other than the supercharger, any changes seem so marginal to me that its not worth the expense (or invalidating the insurance) for. Keep telling myself someday ill get a 2.8 or 3.0 though :D

Having said that I'm as tempted as anyone by a little more power. I had an exhaust (no remap) and saw no difference, it just seemed somehow more laboured as it was making so much more noise. But perhaps the remap was needed to make the gains?

Maybe you could consider improving the handling instead? . I've heard a couple of people here saying new shocks make a huge difference. And a strut brace.

That's my midnight meandering thought on the matter anyway. Perhaps I need some sleep :shock:
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"I spent a lot of money on booze, birds and fast cars. The rest I just squandered." George Best

geordie90
Joined: Sun 18 Nov, 2012 14:10
Posts: 111

  Z3 roadster 1.9

Re: 1.9 performance tips

Post by geordie90 » Fri 26 Apr, 2013 17:19

hi
Ive lowered the suspension, def benefits
K and N induction kit, sounds good and feels better throttle response
Cobra s/s exhaust, sounds good and seems like breathing a bit better
New plugs
strutbrace, improves handling immensely
Have to say the throttle response is far better and it gets to were i want it to be quicker, sounds nicer and handles better, im saving for an Z3M as I think this is my ultimate destiny lol

C

Del
Joined: Sat 19 Nov, 2011 18:35
Posts: 2122

  Z3 roadster 1.9

Re: 1.9 performance tips

Post by Del » Fri 26 Apr, 2013 19:42

Happy with the way mine runs – I think it’s quite nippy. It starts with a flick of the key and revs smoothly and freely. It offers a good burst of acceleration when overtaking etc. A similar age Golf GTI is putting out about 125 BHP.

Things I’ve done:-

1.New DISA valve – original was very noisy when I acquired the car.

2.All new vacuum pipework. MAF bellows through to the “tree” of pipework feeding each injector (M44 engine). I found that the splits were difficult to see and occur where the rubber pipes bulge slightly where they push over the receiving pipes on each injector. Typically I found these split on the underside and are quite hard to notice – two of mine had split and one was only noticeable with the pipework removed. These leaks result in extra unmetered air, a slightly weak fuel mix and thus a loss of power.

3.New set of Bosch plugs (4 electrode type). Bosch say: - “If your car has 50-75,000 miles or more on the clock, it almost certainly has some internal wear, with attendant loss of some engine compression and increased oil consumption. An engine with this kind of mileage is almost sure to develop deposits on pistons, valves and, therefore, on the spark plugs as well. As such, upgrading to a multiple electrode spark plug will provide extra ground electrodes so the spark can take the most efficient path to provide optimal spark. These plugs utilize 'surface air gap' technology for superior spark efficiency, and are permanently pre-set at the factory for correct gap. And the multiple electrodes are less likely to foul.”

4.New camshaft position sensor. As I was chasing a mysterious misfire I changed my camshaft position sensor. I wouldn’t advocate this as some form of routine servicing but in my case – even though I wasn’t getting a specific diagnostic error code, it made an immediate and noticeable improvement.

5.Cleaned throttle body.

6.New, standard air filter.

7.New fuel filter.

8.Quick succession of engine oil changes to clear a sticky valve lifter issue.

9.New thermostat – was running too cold.

10.Super unleaded petrol seems to give me a slight performance improvement and definitely better economy.

Both me and others noticed a definite improvement after 2, 4, 5 & 8 above. Obviously, six cylinder engines are better – I’d be daft not to acknowledge that, but it’s best to make the most of your engine and have it running at optimum performance. Hope this helps. :lol:

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PCSAM
Joined: Sat 13 Aug, 2011 02:19
Posts: 1002

  blank
Location: Taynuilt

Re: 1.9 performance tips

Post by PCSAM » Sat 27 Apr, 2013 13:49

you could do the air box mod on the 1.9 . :D
I just happen to have a 1.9 full air box you could do the mod on and save your original one ......
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Gonorr
Joined: Sun 12 Aug, 2012 14:53
Posts: 42

  Z3 roadster 1.9i
Location: Somerset

Re: 1.9 performance tips

Post by Gonorr » Sat 27 Apr, 2013 14:17

I did the Fogged airbox thing on my old M43 19, personally, I think it made a difference. Its on the cards for the this one too. Hopefully, now the longer days are here, I will get around to it.

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kamagloire
Joined: Mon 05 Nov, 2012 23:27
Posts: 26

  Z3 roadster 1.9
Location: Sydney

Re: 1.9 performance tips

Post by kamagloire » Sat 27 Apr, 2013 14:38

Cold air intake and better exhaust - much better throttle response and more a joy to drive.
Nothing else is worth the money on a 1.9 and with the amount of cops on the roads I use, 1.9 has now become my engine choice.

DC
Joined: Tue 15 Sep, 2009 18:31
Posts: 562

  Z3 roadster 1.9
Location: Inverness-shire

Re: 1.9 performance tips

Post by DC » Sat 27 Apr, 2013 15:22

Del wrote:
10.Super unleaded petrol seems to give me a slight performance improvement and definitely better economy.
I would second this, makes a definite improvement to MPG and engine runs far better.
Dave.
Dave. 1998 Arctic Silver Z3 M44 1.9 Automatic

Beaker
Joined: Mon 03 Sep, 2007 21:23
Posts: 67

  Z3 roadster 1.9
Location: Glasgow

Re: 1.9 performance tips

Post by Beaker » Sun 28 Apr, 2013 17:02

Cheers folks.

I've looked at the air filter box mod and might start there.

Thanks everyone

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Woody1000
Joined: Sat 30 Mar, 2013 09:38
Posts: 223

  Z3 roadster 3.0i
Location: Chelmsford

Re: 1.9 performance tips

Post by Woody1000 » Sun 28 Apr, 2013 18:38

I had my 2.0 remapped and it gained a few BHP but it was the toque that was much more noticeable ! It's got a fair bit more pull now than before and I think it was worth shackles !
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markrnorton
Joined: Mon 05 Jan, 2009 13:19
Posts: 841

  Other roadster
Location: Essex

Re: 1.9 performance tips

Post by markrnorton » Mon 29 Apr, 2013 10:23

ITG air filter
cold air feed
Viscous fan removal (replace with electric)
100 cell hi-flow cat
Big bore throttle body
Spare wheel removal (replace with BMW mobility kit)
Stainless exhaust (saves more weight)
Lightened flywheel
re-map to smooth out and increase torque curve
Still modifying

Del
Joined: Sat 19 Nov, 2011 18:35
Posts: 2122

  Z3 roadster 1.9

Re: 1.9 performance tips

Post by Del » Mon 29 Apr, 2013 14:01

Seems like the overall gain is the sum of lots of small improvements unless you want to spend a fortune on major engine modifications which would probably cost more than simply trading-in the car for a bigger engine model.

I like inexpensive “quick wins” that don’t cause insurance problems and I have very much been a cynic of the claims made by K&N panel filters – believing that you may as well flush £35 down the toilet. However, wherever you look you see views, that you can’t simply just ignore or dismiss, from owners of various cars saying that they achieved a slight improvement from a K&N panel filter. The K&N advertising is also very seductive and if they have been fooling customers, they have successfully been doing so since the 1960s. I also came across the attached on Youtube. I might experiment with one this year when I change my filter.

https://www.youtube.com/watch?v=mJW29eDZXzg

I’ve also read, from fairly sensible technical sources, that induction kits work best if: 1) fed by cold air and 2) on bigger, “torque-ier” engines. On smaller engines developing their torque at high revs then a panel filter is just as good.

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ShayneJ
Joined: Fri 01 Feb, 2013 21:27
Posts: 40

  Z3 roadster 1.9
Location: Lambourn, Berkshire

Re: 1.9 performance tips

Post by ShayneJ » Tue 30 Apr, 2013 23:18

DC wrote:
Del wrote:
10.Super unleaded petrol seems to give me a slight performance improvement and definitely better economy.
I would second this, makes a definite improvement to MPG and engine runs far better.
Dave.
Does the improvement outweigh the extra cost of SUL ?
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DC
Joined: Tue 15 Sep, 2009 18:31
Posts: 562

  Z3 roadster 1.9
Location: Inverness-shire

Re: 1.9 performance tips

Post by DC » Wed 01 May, 2013 09:07

ShayneJ wrote:
DC wrote:
Del wrote:
10.Super unleaded petrol seems to give me a slight performance improvement and definitely better economy.
I would second this, makes a definite improvement to MPG and engine runs far better.
Dave.
Does the improvement outweigh the extra cost of SUL ?

On a purely cost basis it's debatable and maybe not but I find personally on a driving pleasure basis the engine runs sweeter, the gear changes are much smoother and the car pulls better in a higher gear plus a few MPG better.
The only way is to try it and see if it's worth it.
Dave.
Dave. 1998 Arctic Silver Z3 M44 1.9 Automatic

Beaker
Joined: Mon 03 Sep, 2007 21:23
Posts: 67

  Z3 roadster 1.9
Location: Glasgow

Re: 1.9 performance tips

Post by Beaker » Fri 03 May, 2013 18:19

What's the deal with exhausts from a legal stance?
I've got a custom stainless steel back section but manifold and cat are standard.

What can I replace at the front to make my zed breathe a bit better. The guy at the custom shop said I could replace the lot with stainless steel and he'd cut the cat back in (if that makes sense) but I want it to be legal and no sound like a tractor!

Man the supercharge option looks like a lot of fun, pity the guy who did that has now sold his car (from what I read).

Del
Joined: Sat 19 Nov, 2011 18:35
Posts: 2122

  Z3 roadster 1.9

Re: 1.9 performance tips

Post by Del » Fri 03 May, 2013 22:50

The new MOT tester instruction rules that came out from 20/3/2013 say: - “On petrol engine vehicles that qualify for a full catalyst test, check the presence of the catalytic converter.” So you have to keep a cat if your car was built with one originally. Switching to a sports cat will add a couple more BHP and cost approx. £200 - £300. You might get similar gains with an induction air filter (£150?) fed with cold air and an ECU remap (£400?). All these things will each give you small a improvement.

You are supposed to declare them to your car insurance company :(

Beaker
Joined: Mon 03 Sep, 2007 21:23
Posts: 67

  Z3 roadster 1.9
Location: Glasgow

Re: 1.9 performance tips

Post by Beaker » Fri 03 May, 2013 23:29

Yeah I think I'll just need to settle on the power I have as I can't afford to change car.

Think I'll turn my attention to exterior styling, a set of angel eye headlights and m mirrors would also be sweet.
I may, as was suggested earlier on this thread, tinker with the handling as well.

Need a wee project :-)

Gonorr
Joined: Sun 12 Aug, 2012 14:53
Posts: 42

  Z3 roadster 1.9i
Location: Somerset

Re: 1.9 performance tips

Post by Gonorr » Sat 04 May, 2013 20:42

Fogged airbox? Its on my list of things to do this weekend if I can get away from work early enough and avoid getting stitched up with house hold DIY tasks, :lol:

Mike_1986
Joined: Fri 04 Jan, 2013 10:19
Posts: 11

  blank

Re: 1.9 performance tips

Post by Mike_1986 » Mon 06 May, 2013 19:18

Have found a lot of this info usefull.
also driving the 1.9 model i can totaly relate to a lot of the comments.
so far i have have put on a powerflow backbox ( ok i know its adds only about 1 bhp but i like the deepers sound.lol) also plan to upgrade the airfilter and spark plugs in near future.

Did look into the De-cat option but a lot of people say only works if get it remapped.

Beaker
Joined: Mon 03 Sep, 2007 21:23
Posts: 67

  Z3 roadster 1.9
Location: Glasgow

Re: 1.9 performance tips

Post by Beaker » Mon 06 May, 2013 19:37

I put in new plugs at the weekend, switched to super unleaded and bought the bits and bobs to Fogg the airbox.

Feels a wee bit better already.

Mike Fishwick
Joined: Fri 19 Jun, 2009 11:27
Posts: 1991

  Z3 roadster 2.8
Location: Daglan, France

Re: 1.9 performance tips

Post by Mike Fishwick » Tue 07 May, 2013 11:05

Have a good cylinder head job done, add a pair of Kent 312R camshafts, and have a remap - it will look standard, add about 25 bhp with better fuel consumption and torque. Ok - it will also cost about £1000, but more power=money!
A Z3 is not just for Christmas - it's for life!

sobe_on
Joined: Tue 18 Jan, 2011 07:44
Posts: 157

  Z3 roadster 1.9

Re: 1.9 performance tips

Post by sobe_on » Thu 09 May, 2013 03:20

Z3cade wrote:Don't waste your money.. 40bhp increase from a chip on a 1.9 is pure bull...

You could go for a real mapping session to get a better throttle response but you will never get big HP gains..

Other options would be to go for a cone air filter and free flow exhaust to free her up abit otherwise sell up and go for a bigger engine Zed.. Bit harsh but in all honesty it's your best option if you want more grunt.
I'm agree with you dude! it is impossible to get 40bhp on 1.9 from a chip only
but it is a bit improving for HP after the dyno test if done the real mapping with ECU chip, of course we should do the basic modify
(pulley, coil ignition system, bigger throttle, header (manifold), full kit of exhaust & exhaust control valve ECV flange)

Yes, The budget will be much higher for change into 2.8 engine, so I'm not recommend to do if not a super lover
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BMW Aero Side Skirt/rear spoiler & chrome roll bar/ handle
AC schnitzer front/rear bumper splitter,Exhaust,type2 17"
BC coilover/H&R swaybar/wiecher's strut

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