We took an 2002 S with a Comptech SC (6.5 PSIg) and converted it to secondary fuel injection.

Thread is here:

https://www.s2ki.com/forums/index.php?showtopic=292532



Thanks,
Giles

 

This could be a pretty expensive setup for 7.5 lbs. Injectors rails e-manage, etc.

Did you make more power using this setup at the same boost level? Or just preparing for later buildup?

 

At the same boost level we made +14 HP and +11 TQ even with the baseline set very lean and rather mean. There is no eManage with this setup as the eManage can only drive 2 secondary injectors. We are using one injector for each runner.

The stock Comptech setup was producing 6.5 lbs.

We picked a set of used Civic injectors. These are cheap and plentiful as any import tuner shop will have tons of them due to folks moving to larger sized injectors.

We don't have final pricing numbers yet, but the cost will be a little above an eManage + injector harness + 4 new larger injectors and less than an EMS + 4 new larger injectors. However this setup is much more exandable than the eManage approach and will pass OBDII which the EMS never will. Check out the linked thread in the first post for more details.

 

I think EMS and larger injectors is still the way to go if not simply for tha fact that you have soooo much more control over everything. And is it just me or are the secondary injectors pointing straight down?

 

The EMS will never pass OBDII testing so it's not an option. The EMS is really for race use only so a number of drivability issues will never be fixed. I've used an EMS in my car for two years now and have tuned it on an almost daily basis. I also own my own dyno so my map is pretty much as good as it gets - still the EMS has limitations and bugs.

The injectors are pointing staight down. The only time that injector angle makes a difference is at low rpm and low load when the pulse width of the injector is small in comparison to the time that the intake valve is open. At high rpm most of the fuel is injected onto the back of the closed valve and the intake manifold so it makes no difference.

 

so what exactly is driving the injectors? Is it the same pulsewidths that the factory injectors are getting? If so, how are you overcoming the load (resistance) on the injector drivers in the ECU?

Are you turning them on via pressure switch when boost comes on, or by RPM?

 

We are using a secondary injector driver box that can drive 4 injectors. They are completely independent of the stock injectors. They are tuned using a PC via 16 or so RPM breakpoints and some like 60+ load breakpoints. The injector driver has its own map sensor. There is actually very little wiring that needs to be done as the injector harness is all pre wired. Just needs power, ground and a tach signal (pin A-19 if you are using the Honda USA pinouts - left to right ordering). One vacuum line and you're good to go.

 

Sweet, the right way to go about it, in other words.