boost figures, wastgate settings

[vagrallye]

i have just removed a "super chips" chip to fit a "pair" of mrc hi boost chips on a 3b s2, i have set the wastegate back to where i concider it to be correct (super chips chip relied on tightening the spring from what i can make out)
just wanna make sure im in the right place

i am talking about guage readings below
may be a silly question but the mrc chips are a 1.3bar map
does this mean they hold 1.3bar or peak 1.3bar (19psi)
what pressure are people seeing with mrc chips on an 3b s2?
i think im not quite right on the waste gate as i retested with super chip after winding screw out to cover the " un tarnished " threads and i saw 9-10psi and holding quite well, i was lead to believe stock pressure is 0.5 bar /7psi
so i could be 3 psi out or i could be a percentage out

[4WheelDrifter]

IIRC with the N75 unplugged you should get 0.4 bar boost. Check that and adjust the spring tension first. Plug the N75 back in, reset the ECU, you should then get 1.4 bar boost with the MRC chips.

[vagrallye]

IIRC with the N75 unplugged you should get 0.4 bar boost. Check that and adjust the spring tension first. Plug the N75 back in, reset the ECU, you should then get 1.4 bar boost with the MRC chips.

ill do that , how do i reset ecu? can it be done without scanner etc i would of thought it would be semi self learing being old digifant style , just left a code but worked fine...?
how come 1.4 bar on a 1.3 bar chip set? is this a "peak/spike" or steady figure?

[4WheelDrifter]

If you've got a 1.3 bar chip then you'll get 1.3 bar peak. The boost will then slowly tail off towards the redline.
Just reset the ECU by leaving the battery disconnected for a few seconds.

[vagrallye]

If you've got a 1.3 bar chip then you'll get 1.3 bar peak. The boost will then slowly tail off towards the redline.
Just reset the ECU by leaving the battery disconnected for a few seconds.

cool ,thanks i couldnt of been far out when i wound back the spring then, ill redo it , i couldnt remember stock figures ant then couldnt remember how to calculate to psi
but i know know, ill set to 6/7psi with valve disconected then disconect battery and go from there,


could it be a stiffer spring also from super chips????

[newsh]

Or pull the 2 "Motor" fuses at the front of the fuse box.

[4WheelDrifter]

cool ,thanks i couldnt of been far out when i wound back the spring then, ill redo it , i couldnt remember stock figures ant then couldnt remember how to calculate to psi
but i know know, ill set to 6/7psi with valve disconected then disconect battery and go from there,


could it be a stiffer spring also from super chips????

It's worth checking the spring. See this thread for details of the stock spring.

Good point Newsh. I forgot about those 'motor' fuses.

[vagrallye]

how mush thread should be showing either inside the nut of outside the nut on the top of the wastegate? anyone got any pics of stock wastegate showing this?

[UrS4boy]

how mush thread should be showing either inside the nut of outside the nut on the top of the wastegate? anyone got any pics of stock wastegate showing this?

Proper wastegates do NOT have bolts with nuts sticking out of the middle of them. They have a hex (Allen) socket-headed bolt that sits down IN the wastegate. Stock has the top of the socket-headed bolt down about 3 or 4 threads IIRC.

I am running a 1.9 bar WG spring and have to have the socket-headed bolt run right to the top because otherwise the rate of boost rise is too much for the ECU and it thinks it is overboosting and goes into a reduce boost/increase boost jerk/coughing session.

[vagrallye]

i need to check the spring then by the sounds of things , i also have a misfire problem whish could be assosiated to making to much boost to quick!

the boost chip in the ecu was deffo standard so the super chip must rely on bigger spring or tightening it up
ill check today
i thought i saw on here some pics of standard springs but i cant find it now any pics or ideas where the post is?
cheers

[Rusty]

With the N75 unplugged the gauge pressure should be 0.4 bar. Adjust the pre-load bolt on the spring to achieve this and then as said above, it should all work a lot better. Nothing wrong with mechanical boost IMO but it has to be done properly and Motronic isn't the answer.

[vagrallye]

gonna check the spring first cause if its a stiffer spring im fighting a loosing battle

[4WheelDrifter]

i need to check the spring then by the sounds of things , i also have a misfire problem whish could be assosiated to making to much boost to quick!

the boost chip in the ecu was deffo standard so the super chip must rely on bigger spring or tightening it up
ill check today
i thought i saw on here some pics of standard springs but i cant find it now any pics or ideas where the post is?
cheers

It sounds like the usual Superchips setup. Many 'chip tuners' don't even know how to write a boost chip, so they rely on messing with the wastegate spring to adjust boost. The fuel and ignition chip probably has some maps that they 'borrowed' from somewhere else.
A good reason to ditch them in favour for some decent ones like MrC chips.

Check the link in my previous post for info on stock wastegate springs.

[vagrallye]

It sounds like the usual Superchips setup. Many 'chip tuners' don't even know how to write a boost chip, so they rely on messing with the wastegate spring to adjust boost. The fuel and ignition chip probably has some maps that they 'borrowed' from somewhere else.
A good reason to ditch them in favour for some decent ones like MrC chips.

Check the link in my previous post for info on stock wastegate springs.

cheers , yea im glad i got mrc chips