VR4 RS vs Aspec timing maps
- Thread starter Jazz9
- Start date
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As I said, the RS maps are very agressive and I wouldn't advise running them on 98 octane pump fuel, as well as remember the HIGH load point is intended for maybe 10-12psi on a 14b/small 16g - and will stay at that regardless of how much higher you go. 20deg advanced at 18psi+ probabaly isn't advisable...
What have you got onboard Glen? Are you running a chip/ostrich/ECMlink?
Sure we could work something out.
Not 100% sure. Haven't looked into speed density myself and I don't have an ECM link or access to their forums etc. At a guess it would be much the same as a base map for an aftermarket computer running a similar (not AFM) setup. Different engine builds, intake/exhast mods, turbo's etc make a much bigger difference to a MAP based tune because it's not actually measuring the air that the engine is swallowing. Just for example a 14b will pump out ~405 CFM of air at 15psi and a big 16g will pump out ~550 CFM of air also at 15psi. Same manifold pressure, vastly different airflow capacity with a very different tune/AFR.
I'd actually like to get into tuning, including the speed density options and MAP based tuning... it's just not on the cards just yet.
EDIT - just a disclaimer that this is just the way I understand it from what I've learnt from skulking around on forums, talking to different people etc etc. The only thing I really have first hand experience playing with is the "stock" AFM based setup.
I have a stock engine with arp/cometic gasket - tdo5 20g - 560cc injectors 055 and 20psi. I have been running the RS tune for 3+ years without issue. base timing set to 5deg. I was running 8deg before but just turned it back. I see some knock ( 1-3 count ) when the intercooler is very hot. 98 octane all the time.
almost running out of injectors.
Glen
almost running out of injectors.
Glen
Have you done the intake leak test? Do you have a wideband and know what AFR's you're running?
If you haven't had any issues, then that's great. Just the cars I've put them on they have been a bit too agressive esp on pump fuel with high boost.
But again every car and setup is different =)
If you haven't had any issues, then that's great. Just the cars I've put them on they have been a bit too agressive esp on pump fuel with high boost.
But again every car and setup is different =)
I had a chip based on RS maps then compensated for an 055 and 510's and it knocked on anything over 14psi. Too much timing to run decent boost. i cant remember the exact timing figures but they were a lot higher than what i was running once tuning with ecmlink.
If you have a palm logger setup to monitor knock, and not running much boost on say a 14b or 16g, they could be very good maps.
As the chip had the octane reset it doesn't allow the ecu to move towards the low octane table as you knock in higher counts and for longer.
You stay on the high octane map as its resets every time the car is started.
In my opinion this is stupid when using such an aggressive tune that will knock when trying to run say 20psi.
I would have thought it would be better to at least let the ecu move towards the low octane map and "learn" until you stop knocking.
ozyvr4
Well-Known Member
I will have to check but at 750rpm mine idles at 10deg. I will confirm tomorrow.
