sequential fuel injecton on rover V8

[SuperV8]

I have a supercharged (centrifugal type) 4.6 rover V8 currently running megasquit 1 with extra code, with coil packs and Bosch 42Lb design III injectors.

Just thinking of upgrading to MS2 for the better fuel injector control/ higher resolution of the maps and control of the PWM idle control valve and have been looking at MS3 with sequential injection.

Is any one using it?
Is it worth it?

I have the GEMS type timing cover with CAM shaft sensor hole so i'm not worried about the instilation. I'm guessing would be harder to set up/ tune.

Any thoughts welcome.

Tom.

[Seight-V8]

hiya,

I have a VEMS setup and i am using the GEMS flywheel & pickup...but i've also fitted the front cam sensor in my interim cover.

Only problem is the pulley that the camshaft sensor runs off...will also need to be changed to a GEMS one...but the way these trigger is awkward.

As it triggers from the slots in the cam wheel....and they are not symmetrical and these will cause trigger problems in the software.

Mine is all set...but i plan at a later date to go fully seq....but it might not work due to the cam triggering....

Not sure it even maske much difference on the v8 anyway...my 4.6 drinks fuel at the best of times...

good luck

scott

[kiwicar]

Hi
From various bits I have read, if the engine is in a very high state of tune then there are a few bhp to pick up from sequential injection but even then if you have two banks on batch fire and fire each bank twice in 720 degrees there is very little if anything between the two above about 2/3 of the way to max revs. What it does do is let you run a leaner part throttle mixture and can get a camy engine through emissions that would struggle otherwise. I also read an article from someone who had set up a sequential set up timing injection for max power,gaining a few more bhp as a result. He then switched back to batch fire as above and picked up a few more as a result. I'm not really sure what that tells you though
In a mild state of tune I think it gains you very little if anything power wise but id does give you better fuel economy.
Best regards
Mike

[SuperV8]

I'm using the standard cam pulley so i'd have thought that should be fine and I could use the standard cam sensor.

Yes, I was also wondering if there is any advantage with all the extra hassle?

May just go semi-sequential with MS2

What's your MPG? Not that they're built for that, just wondering

Tom.

[daxtojeiro]

Hi,
Ive sold a few semi-seq setups for RV8s and the results are yet to come back to me, one guy hopes to get his on the RR next week.

Ive got mine all wired up and ready for seq COP and fuel but we are still awaiting the MS3X boards to be built, so its on hold right now.

In order to do this properly you will need to tune it using EGTs and balance the cylinders, so that they all run the same. Speaking to James, he has his running now on MS3, he says the idle is much smoother than it was and that accel rates are increased.
The guys who have done 4cy engines on MS2 say that the accel rate is impressive, this is due to the fact that any changes in rpm can be fueled for quicker than if using batch fuel, so highly strung turbo 4cy engines will really find this helpful,
Phil

[ian.stewart]

I'm using the standard cam pulley so i'd have thought that should be fine and I could use the standard cam sensor.

Yes, I was also wondering if there is any advantage with all the extra hassle?

May just go semi-sequential with MS2

What's your MPG? Not that they're built for that, just wondering

Tom.

Im not runnng MS or sequential but with a lightish car, and being kind to it on a motorway I get about 33mpg with batch fire with Throttle bodies on an Emerald ECU.

[SuperV8]

so highly strung turbo 4cy engines will really find this helpful

Or a highly strung twin turbo V8....

Sequential does sound good but I think at the moment the extra tuning required just puts the cost up a little too much. Something for the future thought.

Would be great to perfectly tune each cylinder.

I've ordered MSII card so plan to run semi-sequential, see how that goes.

Tom.

[stevieturbo]

Unless you are going to monitor AFR's or EGT on each cylinders fuel and can then adjust fuel trims and timing if need be on an individual cylinder basis...and ideally spend the time on a dyno optimising this.

I really wouldnt worry too much about sequential. It will potentially have more impact on emissions, than actual power available.

If you were using big injectors, then it would certainly be favourable to run sequential though. But at 42lb, they are still relatively small, plus the Bosch 42lb's work very well.


Sequential would always be nice to use....but you have to balance the cost of what gains you might get, for what you will need to spend in money and development to actually see those gains.

[katanaman]

I know there are a few systems out there that do sequential but I didn't think there were many that would actually let you tune each cylinder. In fuel injection terms anyway that would involve a colossal amount of memory since you would need to store at least 8 fuel maps never mind ignition maps. So who is doing sequential with maps for every cylinder?
This isnt a your wrong thing by the way, I am interested and didnt know this was available on anything other than top line (read very expensive) systems.

[92rrrandall]

I too would be very interested in adding computerized ignition and sequential injection to my 14CUX controlled engines.

The main benefits of sequential are at low rpm and for emissions. The lower the rpm, the more beneficial. This can allow for a smoother idle and lower idle speed. At high engine rpm, events are happening so fast that there is nothing to be gained from sequential timing of the injection.

If your car has four O2 sensors, then the timing of the injection can be altered to adjust the emissions. I believe this is covered in the Range Rover(Bosch) workshop manuals.

Having serious doubts about using gen3 injectors too. I had to reduce my fuel pressure to get it to run better during normal driving, but now it pings on full throttle. Fuel consumption is also up. This is comparing Lucas 19lb verses Bosch Gen3 19lb.

Randall

[stevieturbo]

I know there are a few systems out there that do sequential but I didn't think there were many that would actually let you tune each cylinder. In fuel injection terms anyway that would involve a colossal amount of memory since you would need to store at least 8 fuel maps never mind ignition maps. So who is doing sequential with maps for every cylinder?
This isnt a your wrong thing by the way, I am interested and didnt know this was available on anything other than top line (read very expensive) systems.

Most systems you can trim individual cylinders +/- % based on the main map. or degree's of timing based on main map.

And also a full 3D map for injection timing too ( although not ususally each cylinder )

But it would only be in extreme cases people would take advantage of such features. As generally, gains are small.

[katanaman]

thanks Stevie that clears that up, I thought you guys were on about mapping each injector.

[stevieturbo]

In a sense it is though