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[steverubberduck]

i'm having my car tuned on saturday as i have had a couple of changes under the bonnet.
my question is, what do they actually do on an engine tune to make a difference??
its been a while since i had an engine tuned, the last one had a carberator.
i don't claim to be a mechanic, but it is nice to know what he'll do.

[ngrainqey]

lmao bugger all tbh, most tuning now is just remapping for such as boost pressure on turbo cars, fuel mixture needed for u.k spec petrol(some maps are set for 97+ octane only so run in limp mode with 95) timing gets advanced...depends what engine management it has really, on volvos like mine they have a newer engine management which means that say trying to just wind up the turbo boost manually will only make the car run in limp mode (as the ecu compensates and brings it back down to how it ran normally) or if it'd have been an older volvo (think it's motronic 4.4) then you can wind up the boost on the turbo till you get fuel cut!

[steverubberduck]

it did get me wondering.
I have a panel filter, a new air resonator, gas flowed throttle body, super 4's and a set of fuelcat ht leads and a direct air feed.
so i thought after all that being fitted, get an engine tune.
the garage that is doing the work also does remapping.
but i was just curious as to what he will be doing??
he said it will take between an hour to an hour and a half.

[ngrainqey]

welll...i wouldnt get too optimistic, you'll be looking at about 15bhp tops depending what he does, really if your going to tune the goolies off something then you'd have to get a custom map but i dont think that really applies to what you've done lol!

[Seth]

I thought the ECU and various sensors took care of everything.

Didn't think that anything relevant was user-serviceable.
I suppose he could try reading any stored fault codes, and then rectify any faults ........

[steverubberduck]

thats why i asked...
but the bloke tuning it has a good history tuning racing cars.

[ngrainqey]

lol racing engines use standalone fuel management for a start so your timing and fueling is all run from a none standard/piggybacked ecu basically to stop the cars ecu having a paddy