MicroSquirt.com read only forum (Jan.15,2018)

I am running!! A-engine with a TBI and a supercharger blowing! It works, I have beenm driving around, no real problems since I moved the throttle upstream in front of the blower. I have to do all 'fine tuning' (VE and cold start), but it works (wet manifold, 2 squirt per cycle).

So how are the projects going? Any updates. Going to try the single TB dual injector wet manifold route. Are there any starter maps for this set up on the a series engine? Thanks

Peter

Peter - I will have the ignition running in early July and will then start to add a couple of wideband O2 sensors. Then I shall be in a postion to look at injector sizing and which TB to use - Currently the Jenvey 48mm single with 2 injectors is looking like the best bet.

Any one have updates on injection the A series????

Pickup my engine with crank sensor today so should be able to check the 10Deg limp home mode over the weekend.

I have a RR session booked next week so I am looking to get ignition mapped then. Then a slow build of all the sensors and TB. I hope to get fuel sorted in a month or so.

Anyone got a base ign map for an A series?

I am running, A-engine 1293, supercharged. Did a bit of tuning (MS tweak), things look very promissing, I only have some spikes which I have to tackle now. But that has noting to do with the engine itself or the setup.

I have no leaner cylinder (checked the plugs). Got it almost good enough to make the trip from the workshop to my house (100 miles) to finish tuning

My latest update is that I've managed to pass our emissions test but for the most part it's running hugely rich. That's mainly down to the standard injectors I'm running being sized for sequential injection so they're twice as large as I really want to be running.

If I run 2-squirts per cycle I gain enough resolution to lean it out, but I want 4-squirts to eliminate any charge-robbing. MS2, with it's high resolution code will cure the problem, as would smaller injectors. As it stands though it is driveable albeit a bit jumpy in traffic and it is mappable, albeit slightly painfully. I'll give a further update when I have some more news.

"cng1" wrote:
> That's mainly down to the standard injectors I'm running being sized for
>sequential injection so they're twice as large as I really want to be running.

In fact having just reviewed the logs, my peak duty cycle is 30% which does
help explain why I'm struggling with the resolution. Time to order some
smaller injectors I guess.


Posted by email.

Not quite as sexy or advanced as Chris but Ladies and Gents - we have ignition!

Any pointers to how to sort a map out or better still a base map for the A series?

Oh, and how to not blow a hole in a pistion while playing....

I've finally had a bit of time to try mapping my mini. I've swapped down to some 208cc/min injectors from the monsters that rover use from the factory.

The smaller injectors seem to be ideally sized but running 4-squirts per cycle it's very lumpy pulling away from idle, MS2 will fix that though as it's just down to resolution. The TB is also a bit on the large size which means that a gentle cruise is at 90kpa which isn't helping but I think we can cope with that.

There seems to be very little power beyond 4000rpm which is either down to needing more advance or a "towing spec" camshaft.

Mapping is a trickier than other cars I've done but all in all I think we've thoroughly disproved the theory that you can't do port-injection on a siamesed engine. Now if anyone from this date forth starts talking about charge-robbing, sequential injection or how you need to run a wet manifold then I shall personally hunt them down and blow a rasberry at them.