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What fuel ratio for boost transition?
Posted: Mon Sep 10, 2012 10:25 am
by vincentav8
Hi, I have an R33 with 550cc inj /z32 AFM, all supporting fuel / air mods etc.
My Nistune board was tuned recently and at top end it runs great ... but around boost transition it feels sluggish. Looking at the fuel maps it's set at around 15:1 to 14:1 in the transition area. In fact it only drops below 14:1 at 4500rpm/tp52 (O2 feedback disabled across the whole map).
Seems a bit lean to me?
any views?
Re: What fuel ratio for boost transition?
Posted: Mon Sep 10, 2012 3:05 pm
by bachig24u
I would be pulling lamda down to 0.9 to start with, maybe even 0.85 if it responds well.
Whats the timing like at full load and zero vacuum?
Re: What fuel ratio for boost transition?
Posted: Tue Sep 11, 2012 10:07 am
by vincentav8
Hi, thanks for the response ... I need to take it out and run a log to get an accurate reading, but on the timing map I'm set at about 33 - 24 degrees around transition .. here's the map
Re: What fuel ratio for boost transition?
Posted: Sat Sep 15, 2012 3:04 pm
by bachig24u
a log of boost against the load in the map would tell a story.
Re: What fuel ratio for boost transition?
Posted: Sat Sep 29, 2012 4:53 am
by vincentav8
sorry for the delay ... I ran a few log files but can't confirm what I need to yet.
For some reason when i play the logs I'm not logging speed? will try again, maybe a software glitch?
But, back to the more important stuff I guess I need to work out if I can take a feed off my boost controller to log boost.
AEM wideband going in next week so I can get some accurate AFRs
Re: What fuel ratio for boost transition?
Posted: Mon Oct 01, 2012 2:43 pm
by Matt
Make sure speed is selected in the register list when you connect to consult
If speed = 0 at all times then the ECU isnt seeing the signal (normally speedo > dash cluster > ECU)