Rx7 550cc Turbo Injectors Idling Problem
#1
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
I've got myself a set of Rx7 FC Turbo 550cc Injectors for my 1992 Mazda Eunos 1.6 Turbo.
Fitting them was straight forward and I adjusted the required fuel to a flow rate of 550cc which gave me a value of 4.9(2.45ms)
Driving the car was no problem, the map was pretty close to the 1.8 254cc injector map I had set up
However the Idle is extremely poor, it seems to idle for a second and stalls
Would adjusting my Injection Dead Timing to 1.2-1.5ms correct this and what has everyone else done to sort this problem out?
This is the photo of my screenshot
Fitting them was straight forward and I adjusted the required fuel to a flow rate of 550cc which gave me a value of 4.9(2.45ms)
Driving the car was no problem, the map was pretty close to the 1.8 254cc injector map I had set up
However the Idle is extremely poor, it seems to idle for a second and stalls
Would adjusting my Injection Dead Timing to 1.2-1.5ms correct this and what has everyone else done to sort this problem out?
This is the photo of my screenshot
![](https://www.miataturbo.net/attachments/mspnp-55/156693-rx7-550cc-turbo-injectors-idling-problem-80-rx7_20injectors_zps6dbdhor9_aa3d7e8432ae10d6697d7430e46df41483cb87af.jpg?dateline=1449335122)
#5
![Default](https://www.miataturbo.net/images/icons/icon1.gif)
You aren't going to be able to idle those old slow injectors at 14.7 on 1.6 batch injection. Your calculated pulsewidths are probably smaller than your deadtime values near idle and therefore you aren't getting consistent fueling. Near 550cc injectors your idle PW is going to be near 2.0ms on sequential. If you run batch, you have two squirts per cycle, so you get two 1.0ms pulses which are lower than deadtime.
Drop down to 13.8 AFR or upgrade to sequential, or injectors of this century...
Drop down to 13.8 AFR or upgrade to sequential, or injectors of this century...
Thread
Thread Starter
Forum
Replies
Last Post
thumpetto007
General Miata Chat
4
11-30-2015 12:41 PM