VauxSport - Vauxhall advice and chat forum

[GaryHurn]

hi all i am going to renting the rollers down at mtech automotive next week sometime to get the nova running on the base map provided by martin b (mb automotive)

its a very good starting point engine fires up fine, runs, how ever it runs very rich all over ( the map was for a std engine running vxr injectors) mine is far from standard and runs 750cc

i ve done the fueling around idle to get it some where near stoich (14.7) actually runs 14.5 ish but fluctuates, got an lc1 in the car and also hoooked up the reading to display on the mapping screen saves me looking at the screen and the gauge etc. i also have an audi s3 egt sensor also running and measuring it is postioned after the turbo.

currently on idle egts are around 250 so around 350ish in the collector of the manifold

its running emerald k3.

now my plan was and still is unless other wise advised i was going to get matt operator of the rollers) to hold the car at every load site and adjust the fueling to suit, as trying to get the car on the road to hold a site long enough is very hard. ignition will not be played with at this point its safe enough for now and power figures are not my priority just getting a good map to avoid bore washing the thing and to allow me to comfortably drive the thing around for a few days to run it in.

im planning just to do it up to around 4.4-5k and cap the revs at that so i can put a few miles on the engine before it gets final mapping by dave walker at emerad on april 8th?

any problems with the way im planning on doing it? if so any advice etc would be helpful

[sbd16v]

if your only doing to 4.5k and not really any boost i would not bother with such througher mapping of each load site

i would make sure that the engine is not to lean or rich anywhere and put some decent timing figures in, but for off boost running in it just needs to be safe and not so rich as to bore was

my personal felling would be you dont need the rollers at all to get a decent base map on there.
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glove boxes FTW

[sbd16v]

ok gary just told me its not tax'd and only has a drivers seat

that changes things a little, the rollers are deff best place for you atm, but i still dont think you need to be so accurate just get it close enough

for other ppl thou the above aplies lol
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glove boxes FTW

[GaryHurn]

cheers rob!

my reasons for using the rollers for maybe 1-2hrs is the car is not tax'd, only has 1 seat so cannot carry a pssenger etc, and has no mot as yet!

[chip]

Held values on a specific load site will be different to values when passing through them by the way, not by a huge amount but enough to make visiting every one pointless really for a basemap.

Initially I would just hold the car at a small throttle angle and let it go right up the rev range, the Dyno Dynamics will monitor the AFR and allow you to plot it afterwards as a graph against RPM, so from this you can make lots of changes.

If you fill in a couple of lines like that through the map, its easy to guess the appropriate values in between.

As rob says, anywhere from about 12-15 is fine for running in with, it doesnt need to be exact, just not lean enough to misfire and not rich enough to bore wash.
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Under 400bhp makes baby jesus cry.
(so my boost leak at the jamsport day must have had him sobbing like rich j williams watching a chick flick)

www.totalvauxhall.co.uk

Nova - 457bhp - Mid Engine - RWD - GT35 - Autronic SM4

[GaryHurn]

cheers