42 replies to this topic

[astravxr]

Im getting 10psi on stage 2 when i floor it, is this about right?

[JohnTurbo]

Turbo? Sounds like stock boost.

[astravxr]

Yep. So a dodgy map then? Cant see it been the turbo as i've just put a vxr turbo in not long ago

[JohnTurbo]

Well.... how do you know it is mapped? Have you checked the recirc valve/both solenoids and wastegate? Have you checked all signal and boost hoses for leaks?

[astravxr]

Well.... how do you know it is mapped?
Have you checked the recirc valve/both solenoids and wastegate?
Have you checked all signal and boost hoses for leaks?

Well the lad who had it before me had it mapped and gave me the grahps... plus it doesnt have that flat spot in forth. I havent checked anything mate, how would i check the recirc valve, solenoids and wastegate?

[-Dab-of-Oppo-]

Turbo?

Sounds like stock boost.

I make that much with (I believe) a standard map. What are you reading the measurments with and how are you interpreting them? The figure is from the neutral point, when off boost a gauge should be showing in negative figures. My gauge is in Bar but the needle goes from about -7 to around 0.69-0.76 ie. 10-11 Psi.

[JohnTurbo]

I've never found that flatspot! Do the graphs not have boost on? That does annoy me! Whats the power output, it would have to be over 10psi for anything resembling "Stage 2" You changed the turbo? Seems likely you upset something! Did it pull right afterwards? - or the same? Pipes are th first to check imho. Turbo -> IC -> TB and the hoses to and from both solenoids. (One on turbo, the other on the rear of the engine at the centre).

[astravxr]

TBH i havent a clue about boost gauges at all. Basically i couldnt route the hose through the sill so thought bugger it i'll just hang it over the top as i had the roof off to see what boost i get. Driving normaly the needle sits right at the bottom untill i put my foot down and in every gear all the way up the rev range it sits at 10 maybe 11psi

[JohnTurbo]

Well it should spike and drop to a held figure. My *yawn* "Stage 2" map spikes to a bar and a bit, and holds a bar. (Read ~15psi ish)

[astravxr]

I've never found that flatspot!

Do the graphs not have boost on? That does annoy me! Whats the power output, it would have to be over 10psi for anything resembling "Stage 2"

You changed the turbo? Seems likely you upset something! Did it pull right afterwards? - or the same? Pipes are th first to check imho. Turbo -> IC -> TB and the hoses to and from both solenoids. (One on turbo, the other on the rear of the engine at the centre).

I've never found that flatspot!

Do the graphs not have boost on? That does annoy me! Whats the power output, it would have to be over 10psi for anything resembling "Stage 2"

You changed the turbo? Seems likely you upset something! Did it pull right afterwards? - or the same? Pipes are th first to check imho. Turbo -> IC -> TB and the hoses to and from both solenoids. (One on turbo, the other on the rear of the engine at the centre).

cant find the graph but im sure it doesnt have the boost on. my mate helped me with the turbo change and we double checked everything was put back together right. I think the intercooler pipes are fine though

[Cookies220]

My stg 2 overboosts to 14 - 16 psi then settles at about 12 psi up to the redline. I'm making 246 bhp.

Edited by Cookies220, 22 May 2012 - 06:18 PM.

[astravxr]

What do you mean spike and drop? Like say jump to 15psi when turbo kicks in then stays at 12psi or something? Strange because when i put my foot down in fifth gear at about 45 - 50mph it showed about 14psi

[astravxr]

When i changed the turbo my mate had to take the actuator off to put onto the vxr one, when he removed the nut he counted how many threads there was so when put back together it would be in the same place... could this be it?

[-Dab-of-Oppo-]

What do you mean spike and drop? Like say jump to 15psi when turbo kicks in then stays at 12psi or something?

Pretty much. It should be progressive with throttle, when you completly lift off it should return to reading vacumn.

Strange because when i put my foot down in fifth gear at about 45 - 50mph it showed about 14psi

If you have seen as high as 14psi then that in itself is indicative that you do have a re-map in place. You do not have to be red lining it for it to peak. It is doen on load so you can have your foot to the floor in a high gear with the engine close to laboring and still have a high reading.

Edited by -Dab-of-Oppo-, 22 May 2012 - 06:27 PM.

[JohnTurbo]

Well you should have used the VXR actuator...? I don't see any HARM in using the LET one as such. Ultimate boost level is set by the solenoid...so the ecu. - But spool and some degree of boost stability is handled by the actuator.

[astravxr]

Ah right. Should i try moving the actuator nut up very slightly to see if its any better?

[JohnTurbo]

I don't think i'd start there. Do you have any reason to believe there is a problem other than your ghetto plumbed boost gauge?

[astravxr]

I don't think i'd start there. Do you have any reason to believe there is a problem other than your ghetto plumbed boost gauge?

Lol. No not really, im happy with the power of stage 2. A 300bhp focus rs found it hard to keep with me so it must be doing its job for stage 2. Although i've always thought it didnt boost as it should for stage 2... could a snapped stud on manifold to block cause this?

[rob999]

Just get it on a RR.

[JohnTurbo]

Agreed. Snapped stud...doubt it. Not ideal though!