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Old 29-06-2011, 23:17   #1
billy-b1975
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8 260 boost settings

i recently had a Gizzmo boost controller fitted. I have set this up at: duty=55 and the gain=15 giving me 1.23 measurable pressure when puttin my foot down in 3rd and 4th. Overboost is set to 1.38.

I just wanted to know what the standard boost is for the 260 and what is a safe level to take the pressure up to. I hear all these figures of between 1.3 and 1.7 but im sure the 260 cannot handle those kind of figures with stock cams etc.
any sensible help appreciated.

cheers
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Old 29-06-2011, 23:55   #2
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The engine will be ok at 1.7, but you can't just turn the boost up. You have to have the AFRs checked to make sure it's all safe, which it probably won't be, so you'll need it mapped. You'll also need the fuel cut raised too, but that will be done as part of the re-map.
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Old 30-06-2011, 07:53   #3
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On my 260 the internals are all standard i run 1.65 but overboosts to 1.8 had it like that for about 6 months now all good! Just need a mapper to do it all properly! As aidy states about Afr etc
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Old 30-06-2011, 12:36   #4
Grant620
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1.6 bar will be safe all day long.
Just get it back in for mapping whilst you are at it.

Did we speak on the phone earlier BTW?
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Old 01-07-2011, 20:46   #5
billy-b1975
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Hi Grant

Yeah it was me you spoke to earlier Thanks for the info. Have it booked back in for wednesday 13th.

At the moment its registering at 1.24 bar and the duty is set to 54. So if we turn the gain back to 0 and increase the duty until we reach 1.6 bar (is there any limit on the duty we really shouldnt go over or will it easily reach 1.6 before we get to 100)? and then test it on the dyno raising the gain until we get a nice power band through the revs. What overboost settings would you recommend - is it standard to have about 20 above the registered pressure ie 1.6 bar with 1.8 overboost?)

Thanks for your knowledge and experience. I will get back in contact after it has been set up again and let you know the results.

cheers

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Old 01-07-2011, 23:05   #6
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Hi mate.
You can go on up to 90% safely
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