Warm Up Regulator mod

[Gambit]

you always here of people getting it done well i got it done on saturday on my new 16v.

basically they lower the control pressure which inturn increases the fuelling as 16v's run lean at high rpm's

pro's
it does appear to pull a touch stronger, especially up in high rpm's

con's
it runs like a bag of spanners for 7 sec's from a cold start

incase u didnt know, when you cold start your car, the Warm Up Regulator increases the fuelling for the first 7 sec's. so if your warmup regulator has already been up'ed then you'll find it overfuels now for that 7 sec's

so if you can live with sitting for 7s while it sorts itself out then its worth it.

even better when you get it done for free

[richandhazel]

On my mk1 8v cab I was planning on fitting a less restrictive exhaust system and manifold and a larger throttle body with inlet manifold enlarged to suit.
I already have all the parts, ready to fit.
Something else I do already have is the Audi warm up regulator, however, out of all the mods I'm considering this is the one I'm least inclined to carry out. Whats your opinion - would you go ahead and do that as well? I suppose it might be worth a go, can always swap back I guess

[Gambit]

with all the mod's u've mentioned you could well find that it might benefit from the increased fuelling by running the audi WUR

easiest way id reckon is to get all your mod's done then go get it on a rolling road and see what the fuelling is like. from there they will be able to tell you if increased fuelling would be a help or a hinderance.

[Andy Mc]

How is this done please.......?

My valver is with my mechanic at the moment having a ported head, 264 deg cams and flowed inlet/throttle body being fitted and could benefit from this mod.....

...also when she starts from cold, she tends to run very rough for no more then 10 seconds and if I didn't gently blip the throttle she would die, could this be under fueling perhaps....after the 10 seconds she runs fine, wiv no problems   

[Gambit]

u need to take it to somebody who knows what they are doing. you drill a hole in the little brass cap on the back of the warm up regulator this then reveals a little allen key bolt that you can turn to drop the control pressure. your looking to drop it to 48lb/ft

[VeeDubGTI16v]

and you measure this how?

[Gambit]

u connect a fuel pressure gauge into the main fuel line running into the air flow meter on top of the airbox

its the one that points towards the slam panel.

[MarkII16v]

I was considering getting this mod done but from your description I'm not sure if one of the previous owners has carried it out!
When I start the car it revs up to 2k or slightly above, sits there for around 4 seconds then slowly drops to normal. Sounds a bit rough till the oil gets flowing also. Is there a way of seeing if its been done?

[Gambit]

your sounds as if its behaving the way a std 16v should.

easy way to check is to unbolt the 2 bolts holding the warm-up regulator to the block and look at the back to see if a hole has been drilled in the brass cap!

[MarkII16v]

I'll have a look when I get my car back, having a new head gasket fitted at the moment as well as a load of other work. Glad to hear its functioning as it should tho, would be worried if it was doing something totally different al together!