Jms rs2 help

[Andycollins]

I've got my rs2 fitted but I've noticed that there's a connection coming out underneath that looks like a breather pipe goes too, does anyone know what it's for and if I just need to blank it

 

[aucky]

Coming out underneath what?

 

[-J-]

Andycollins Do you mean the breather pipe from the back of the engine?

 

[Andycollins]

On the jms itself on the manifold side in the middle

 

[aucky]

There shouldn't be empty black holes.

 

[-J-]

On the jms itself on the manifold side in the middle

I can't picture the bit you're talking about and it's to dark to pop the bonnet on mine for a look now.

Might be better off sending a PM to Jamesstone

 

[McGherkin]

Pics?

 

[Toms_clio]

It's the brake master cylinder vacuum hose mate

 

[Andycollins]

View attachment 107600
its the one above the m

if its the master cylinder vacuum hose should it still be there or was it on the acoustic valve?

 

[MicKPM]

As per Tom's post it's a Speedfit for the brake vacuum hose

 

[Andycollins]

im probably being thick now but where will I find this to plug in?

 

[MG cup]

Its a black plastic pipe that comes from the brake servo, round the back of the rear bulkhead heatshiled and would originally plug into the top part of the inlet.

If it ain't connected your brakes must be poor (possibly dangerous at times) and the car must have a high idle??

 

[Andycollins]

I've only just fitted the rs2 so hasn't been run yet apart from turned over, I take that I will need to extend this pipe then as I know it won't reach how it stands.

 

[Chip-mk1]

As above. It's the servo vacuum take off. Without it connected you will have an air leak to the inlet and no vacuum for the brakes (hence very ineffective brakes)

 

[MicKPM]

I've only just fitted the rs2 so hasn't been run yet apart from turned over, I take that I will need to extend this pipe then as I know it won't reach how it stands.

Correct you will need a length of 8mm speedfit pipe (1m max should be more than adequate) and a single coupler. Then put your existing brake servo line in to one end of the coupler (no need to cut the original) then add one end of your new length to the other. Finally route the line to the underside of the new manifold and press the speedfit pipe into the 90° coupler (standard fitment on the rear of the RS2 manifold).

Done

 

[Andycollins]

Cheers guys!

 

[Jamesstone]

There should be a brake vacuum extension pipe in the kit, if purchased second hand then it's likely the previous owner didn't pass it on, you will need the following -

1 meter Pneumatic 10mm Pipe

 

[Andycollins]

Found the pipe hidden under newspaper in the box, is ticking over much better though I think it needs remapping again as it's not running amazing

 

[-J-]

Found the pipe hidden under newspaper in the box, is ticking over much better though I think it needs remapping again as it's not running amazing

It WILL need mapping after fitment of the RS2 irrespective of being mapped before fitment (if it had).

I would keep off full throttle until you've had it looked at as mine ran very lean at top end before mapping.

 

[aucky]

^ this. It's not fit and forget, it needs mapping!

 

[scott.p]

100% needs mapping, I was advised to keep under 3.5k rpm I believe for safety. The new manifold will be getting a load more air to the engine so it will run lean I think.

 

[Chip-mk1]

Yes, as mentioned above there is a risk of it being too lean at the top end until its been mapped.

If its got an RS Tuner map no it then its not as bad as on the standard map, but still not idea, and its not just in terms of the top end leanness either, the transient fueling will be a mile out so there will be points where you get a horrible hiccup when you come off and on the throttle etc.

You arent spoilt for choice on where you go to have it mapped either.

Ktec have declared that they cant get results from them at all, a lad went to them with one fitted and with Ktec's best efforts at mapping it, it was worse than the standard inlet so they told him it didnt work and he stupidly believed them and had it removed.
RS Tuning do a pretty good job on them.
Mike at MWM is the best option though, he's done more of them than anyone else and is the official mapper recommend by James Stone (formerly JMS now Stone Automotive) who makes them.
So far the only cars with RS2's fitted to have cracked 200bhp under independent testing as far as I am aware are Mike's own car with retimed 197 cams (mapped by him and tested at Surrey rolling road) and Dan from SJM's own car on retimed 197 cams (mapped by me and tested at TSR in bridgwater)

Mike's also seen 160lbft on another car with retimed standard cams, and IIRC Paul@RS Tuning has seen similar figures but that was using 421 cams.


In terms of cams spec to work with the RS2, then based on the ones I have seen:
The 197 are ok for a track car and are the best for a bhp figure but they put it through the roof RPM wise (dans made peak power at 7850rpm!) which does make it feel like it needs to be revved a lot on the road and they also lose it torque (140-145lbft is all you will see)

If its a trackday car then 421 are a good option (like Mick from Diamond motors has) for midrange torque (160+ IIRC) and approaching mid 190s bhp

For a road car then retimed standard cams by MWM seems to be the best results so far in terms of the huge spread of torque for a road car, 155 ish lbft and 190 ish bhp.

 

[Andycollins]

It won't be driven until it's mapped, it's a track only car so can only be put on a trailer on the roads, with regards remapping though I know currently it has a super chip remap if I was to buy a rs tuner would this work as there is already a map on the ecu? Or if I take it down to the specialist that mapped it last time can try tweak the map that's on there for this setup?

 

[Chip-mk1]

Forget any off the shelf map. It needs doing on the rollers or on the road.
so in your case rollers only.

So rs tuning is about your only option.

 

[MicKPM]

Andy, as per Chip above this needs to be a custom map for your actual car in a dyno cell.

I got mine off a CSer which came with a mapped ECU/UCH/Key set so I thought I'd save some money... wrong, it drove like a bag of s**t at low rpm. Took it to Paul RSTuning for a minor modification and all great

 

[Andycollins]

The place I had my done last was on a dyno wasn't just mapped and done it was on the rollers for well over an hour getting everything perfect for what I needed, the company specialise in this sort of work so I will speak to them first

 

[McGherkin]

Andy, was that before you fitted the RS2? If so, no matter how well it's done, it won't be right for the car now.

 

[Joe#]

Hi Andy. I had my car mapped by Paul when I had the kit, and I'd recommend him also. Great guy!

 

[Andycollins]

Joe where abouts is he based?

 

[Joe#]

RSTuning is up in Leeds, so not too bad really. Well worth the drive.

 

[Chip-mk1]

The place I had my done last was on a dyno wasn't just mapped and done it was on the rollers for well over an hour getting everything perfect for what I needed, the company specialise in this sort of work so I will speak to them first

Where was that. Not many people have definition files for this ecu.