What boost

[jubjub]

Finally got round to plumbing in my boost gauge this evening. Can anyone confirm what sort of psi i should be seeing? Also is there an optimum gear for which i should be checking the reading in?

[Pete_RS2]

Your RS2 is stock isn't it Dean ? AFAIK max boost should be the same as the ABY homefries, i.e. 1.3 to 1.4 bar which is around 20 psi. Putting it in 4th gear ASAP is probably best to see this.

[jubjub]

I have some more info to relay on this.....The peak readings i got tonight were 6 psi in 2nd@ 5000rpm, 10 psi in 3rd at about 5500rpm and 20 psi at 5500in 4th. Is this normal or do i have another problem with the car
I personally do not think the car is as quick as it was

[jubjub]

I have some more info to relay on this.....The peak readings i got tonight were 6 psi in 2nd@ 5000rpm, 10 psi in 3rd at about 5500rpm and 20 psi at 5500in 4th. Is this normal or do i have another problem with the car
I personally do not think the car is as quickas it was

ooops, double post

[audiman]

Fourth gear Dean, you should be getting about 20 psi. Bang the throttle down at 3500rpm and see what happens. I reckon you have got used to the cars performance!! Upgrade time

[S2central.net]

Stock RS2 max boost is about 1.2 - 1.3 bar - best achieved from low revs in 4th and above. Max boost is about 3500-4000 from memory. Multiply bar by 14.5 for psi.

Chipped RS2 runs to max about 1.6bar and with careful custom mapping you can go even higher - and actually into 2bar if the engine internals are strengthened.

paul

[Doug_RS2]

Am I reading this right dean - Is your boost peaking at 5000 to 5500 rpm? What are you getting at 3500rpm, 4000 rpm and 4500rpm? I wonder if your timing is way out if it is peaking really late - Sal has had this problem in the past.

I found it is easier to mount your boost gauge on top of the steering colum cowel(temporarily with cable ties) and then record a short video of you accelerating in 4th from 1000rpm to redline - then you can see the boost and the rpm and you can plot these later.

Sal is peaking over 2 bar with no internals strengthened on his RS2 setup - although I doubt anyone recomends doing this!

[jubjub]

Thats not a bad idea Doug........ I presume it can't be a boost leak as i am getting decent boost in 4th It just seem's to be ****e in 2nd/3rd, i could not get away from a TT yesterday....

[audiman]

Maybe the TT wasnt stock
It could have been Jabbasoprt'd up with their 350BHP IHI turbo conversion kit??

[kaaperdaja]

My boost reading hits 2,5 sometimes but it's waaay too much. As discussed before enything above 1,8 with stock engine is not recomended. I know guys hitting 3,5+ boost (acc. comp.) and the result is veeery bended conrods....

[jubjub]

Another update to this... I checked the cam timing yesterday and as far as i can tell ,with the knowledge and instructions from the Forum ,it *seems* to be OK When putting it back together tho, i noticed the protection around the earth wire from the coil pack had burnt/melted away and some of the wire was in contact with the coil pack cover I presume this may affect something

With a Team Bodge style repair , i took it for another test and it peaked at 21 psi in 2/3/4th.

[CHEN]

My friends S2 runs at 24 psi quite a lot the engine hasnt gone bang yet but as far as we know apart from chipping its standard are we just lucky? touch wood

[Doug_RS2]

Is that the brown wire Dean? That is connected to earth anyway so shouldn't be a problem if it was touching. Are you getting these peak boost levels at lower RPM now?

[jubjub]

Is that the brown wire Dean? That is connected to earth anyway so shouldn't be a problem if it was touching. Are you getting these peak boost levels at lower RPM now?

Yes

[S2central.net]

That brown wire is the earth path for the coil packs. A bad connection there can cause misfires, hesitation and all sorts of grief...