too slow

[stringbean]

i have a bis and i want 2 aim 4 100 mph without fitting a bigger engine but i cant find any performance bits or any info 2 help me is this possible 2 do or not? help me please.

[1973/126]

 You need a VERY steep downhill, put it in neutral and off you go...

[dajwid]

You bought the wrong car. Why buy a 126 if you need 100MPH? Buy a Yamaha R1 )

There a very few tuning bits for the Bis, lots for the aircooled but you will be putting up big money to get real power, engine swaps would be the way to go, but none are straight forward. All depends on how much you have and how good you are with a welder and socket set.

[stuey]

hmm lightening it more ie-fibreglass panels, perspex windows, loose most of the interior bumpers might liberate a few more mph but as the guys say if you want to go fast then the 126 isnt really the car for it unless you change the engine..

Personally I'd go for modding the suspension to and fitting better brakes, wheels and tyres to make your driving experience more enjoyable...theres nothing like having a road going go kart (I can vouch for this!) to make you smile- if you need some help Im only in norwich Im happy to help.

cheers
stu.

[fightingtorque]

Even if there were the conventional tuning parts sat on a shop shelf somewhere (modified head, high lift cam, sports exhaust, carb etc.) I think the 800cc push rod 2 cylinder motor would struggle to be developed to 100mph.  I used to run a Hillman Imp which was 930cc, overhead cam, and with a ported head, twin choke weber etc making about 60hp it would do somewhere close to 100 but certainly not more.

Only way the bis engine will take you to 100 is with a turbo on it, but I can't vouch for whether the innnards of engine and box will survive.  If you have the available skills then:

find a good used garret GT12 turbo from a small turbo diesel car
fabricate an exhaust manifold and system to suit.
fabricate intake pipework and install intercooler from small diesel car.
install fuel injection using a megasquirt controller
set it all up and see if it holds together.

i think ti

[fightingtorque]

I think it would be a really worthy project and you should go for it.  But it isn't based on any rationale of wanting to achieve a 100mph car within a reasonable effort and expense. 

You'd be doing it for the challenge.

It's something I'd love to have a go at, although I'd like to turbocharge my Cinq first, as that is more straightforward as a first turbo conversion project.

[bis13]

the fastest i have ever got a bis to go was 92mph on a very long a road near me i did several runs and eventually i disintergrated the exhaust through vibration as for making the car go faster you can always use nitrous but it will mash the box up in a jiffy the gearing of the car just doesnt cope with the raised speed .
 the turbo option is indeed a challenge and would be more expensive than it is worth , get your engine lightened and balanced have the head refurbed with bigger valves and polish and port it then skim a mill off ,install with a copper gasket and use a bigger carb . then use a higher octane fuel as used in racing and then you will see a major difference however the temperature inrease can cause problems so make sure you remove the thermostat or fit a manual fan switch and dont run for too long .

[Eklipze3k]

I'd be happy to just be able to do 70mph sustainably, regardless of hills etc

[Darrell]

I suppose with the fifth gear available from axel gerst, and a bit more power in might be achievable on a long downhill, but like everyone says, it's a bit dodgy if the engine and inards would survive.

I'd be happy with a constant 75mph..probably 85 on my lie like a cheap watch speedo