Hi All

Does anybody know if the cosworth injection fires phase sequentially, or sequentially?

Thanks

JJ

 

its sequential

when you say phase sequential what do you mran?

 

Think he means the timing and phase of each injector can be varied independently.

 

you cant change injector trim independently, but you can change the injector fire angle

 

Hi

This is not my area of strength, but I am trying to get a better understanding of ecu programming and tuning.

Here is my understanding

Phase Sequential injectors fired at every time the cylinder performs one revolution, as it doesnt distinguish between TDC compression, and TDC exhaust.

My understanding was that Full sequential required a cam sensor as well as the crank sensor in order to let the car know when it was on TDC compression.

I wonder if the Phase Sensor provides the same information?

Im sure if my understanding is wrong, someone will correct me.



Full sequential injectors fire every other revolution.

 

Just to add, I have bought an S8 ecu, which I dont think allows me to adjust the fire angle (though I could be wrong!)

At this stage, I am just trying to understand exactly how the car works, and how tuning works!

JJ

 

gareth u should start a night school pmsl

by the way u recieved my cheque?

 

it's full sequential on both S8 and Marelli ECU's JJ. Not possible to change it with the version of software that yo have, but was something that SECS was looking into implementing in a future version.

not sure if you really need to change it though, don't know what benefits it brings.

 

JjCoDeX75

ive never heard it called phase sequential before,, normally batch fire or semi sequential

 

that'll be pectel software then gareth

 

 

Cool all,

thanks for all your help. I am a classic case of 'a little knowledge can be dangerous!!!!

I have a manual on tuning cars for a. n. other ECU that provides good calculations for fuel rate calculations etc, but in order to make accurate calculations, I needed to know which the cossie used. The difference is the time given to the injectors to recharge. Obviously full seq is preferred, as it gives greater recovery time!

Cheers all

Hey Nick - Hows the house purchase going? Any further forward?

 

I run mine banked, (all 4 fire at the same time)

I run two banks of four. The second set are slowly phased in as boost and revs rise.

Banked is supposed to give better throttle response than sequential as there is always fuel waiting behind the valve.

I believe sequential was originally designed for modern cars to help with emmision laws.

My MBE ECU is capable of running upto 16 sequential injectors if needed, before anyone asks.

Steve Broughton at SB Developments advised me to run this setup as he has tested both setups on his race cars and datalogged the results.

He found that banked gave the best results.

Would be interested to know what other people use and why?

 

Running banked firing every other rev. Injectors way too big on minimum injector turn-on time to fire every crank revolution. (1.16 ms)
Haven´t had any probs running engine like this.

Lars.

 

you can do this easly with sequ,,,, just by changing the injector firing angle

genrally there is no difference in outright power between, sequ or batched

 

No disrespect intended but has this been proven by yourself on a dyno or is it an opinion?

Didn't think there would be much difference in power but how about throttle response?

Steve at SB Developments does all the motorsport development work for MBE and datalogs everything you can imagine from steering angle to suspension goemetry. His new car even changes gear automatically on the sequential system depending on steering angle, revs, speed etc etc. He seems to think there is an advantage to throttle response running banked.

Not that it makes much difference anyway, but just my two pence worth.

 

but does he have the option of changing injector firing angle?

BTW i read it in a book, and questioning on a forum has nothing to do with disrespect, its good to debate

 

Glad I asked the question.

I am now so far out of my depth that I may need a Submarine!!

Gareth, I am using the Secs S8, and I am not sure that I can change the firing angle, though I am not sure.

CheeRS

JJ

 

Didn't want to sound shirty thats all, as its difficult to get your point accross on these boards sometimes.

Yes you can change everything on the MBE and I believe Steve writes / develops some of the software for MBE.

If he can get the ECU to decide the optimum time to change gear for you he can certainly change the fire angle on sequential.

 

you cant mate,,, its set on a s8,,, simon could change it for you if you wanted him too

AustenW

ya he does sound like the man in the know with MBE