i know you realy need a maram shaft,but what mods do you have to do to the throttle body and iscv,could some one please explain whats needed and how the system works,thanks

 

your throttle body needs to be borred out so it flows more air and your iscv needs to be modified or buy a anti lag valve. not sure who does the iscv modifications might be worth a chat with harvey gibbs as hes great with antilag and can do throttle body modification so ive been told

 

thanks,anyone else

 

Its NOT your throttle body itself you bore out, its just your Idle Valve side of things.

Thats how the ECU managed to byapss the throttle to get enough airflow.
It then whacks a load of ignition timing off, and thats essentially job done.

 

the two holes in the throttle body are bored out so its one big oval hole

 

You dont rebore it, totally different operation.

If you start saying "rebore the throttle body" people will think you mean to fit a larger throttle plate

 

I thought you had to do both - bore the holes into the ISCV, and enlarge the two individual holes to one large (depending on the level of ALS that one requires).

JJ

 

yh that came across wrong i meant to slot it

 

A useful edit, Chip

JJ

 

thanks lads,anyone have any pics of a modded throttle body?..do you have to mod the iscv?and is als mapped in to the ecu or is it a function you have to turn on,thanks

 

Normally its both, the ECU needs to be modified to alter the map when you switch it on.

I dont think people alter the valve itself for most ALS on the road cars, and as JJ mentioned the two holes in the TB just get connected into one.

You can get mild ALS without ANY physical mods though, its just not as good.

 

Chip in fact you can get ALS grp.N way without any mods to throttle body or idle valve (in fact you don't need that valve at all then), you just blokc the throttle at 20-30% open and do the rest by proper mapping. I don' tknow if it can be done with standard Cossie ECu but I presume it must be possible, it's typically done so with standa alone managments and different rallycars in grp.N where you cannot alter anything mechanically.

The downside is that off ALS driving and idle is crap then and EGT's are high at idle due to revs reduced by ignition.

 

Not a nice option on a road car that TBH, as like you say, it ruins the drive the rest of the time.

 

Yes, it only makes sense when going at competetive speeds the rest of the time drives like crap.

 

thanks for explaining mate,so you think on a road/track car is it worth it?/?/

 

If you can afford changing turbos, manifolds, exhaust valves, yes sure

 

cheers pal

 

I run Antilag on my car and would not suggest it for for a road or a track car unless you suffer seriously from lag which then I would suggest changing your turbo first to something more suitable

No idea why it was suggested to change manifolds or valves though, I most certainly have not although I would agree with changing the turbo to one with a marram shaft

 

thanks mate

 

Newton, I was referring SPECIFICALLY to the throttle locked option that Azreal mentioned, and that is not worth it on anything but a full on rally car.

 

thanks chip

 

I was talking about longevity of parts when used with full anti lag made in such a way, moanifolds crack or deform after some time the same about engine head parts that suffer from heat. The same about turbos, they die much faster. Of course if it's only used occasionally it won't hurt anything most probably. There are so many factors like - how long the driver usually stays off-throttle, etc. But all in all it reduces longevity of those parts.

 

there you go fella so u bore out the iscv hole slot the two holes in the throttle body and modify the iscv so it has a little mushroom shaped bung that will go up and down when the anti lag is enabled and dissabled. as for the ecu the map will be set to take out aload of ignition and it put in feul cuts when activated

hope this helps you

 

or hillclimb car!

 

cheers pal thats great