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        General >> Give/Need advice to/from others >> Injector Duty Cycle
        
(Message started by: joshxs on Mar 16^th, 2004, 2:59am)

Title: Injector Duty Cycle
Post by joshxs on Mar 16^th, 2004, 2:59am

Is it possible to display Injector duty cycle using ODB2?

I have a turbo conversion running with a superchip installed in the diagnostics ports of the ECU for additional fuelling requirements. The conv was intially a low boost (5psi), but I have reduced the compression ratio of the engine in order to push the boost up and would like to reprogram the chip to add more fuel, but am concerned about pushing the injectors too far!

Title: Re: Injector Duty Cycle
Post by SaveTheNight on Mar 16^th, 2004, 7:17am

errr ... which model , engine and year.. ?

Title: Re: Injector Duty Cycle
Post by joshxs on Mar 16^th, 2004, 2:06pm

It's actually on a Puma 1.7 Zetec S using EEC V 1999, though I would have thought it would actually be common to all EEC V cars?

Title: Re: Injector Duty Cycle
Post by SaveTheNight on Mar 16^th, 2004, 8:37pm

yes ..but you didn't say it was EEC V ..it may have been a twelve valve .. EEC IV .. and not OBD2 compatible .. anyway ..what are you doing here ?? you should be in " pumapeople " ..regards ...STN

Title: Re: Injector Duty Cycle
Post by joshxs on Mar 16^th, 2004, 8:50pm

mmm, I did mention it was OBD2 though ;)

I am a member of pumapeople, and whilst their are a few knowledgeable people there, this site seems much more technical. *praise* I need to possibly upgrade my injectors, once I can read the duty cycle I will know for sure. There is no injector upgrade for the Puma, hence me looking to the larger Fords out there in the hope I can use those!

Does the scorpy use sidefeed high impedance types?

Title: Re: Injector Duty Cycle
Post by SaveTheNight on Mar 16^th, 2004, 9:01pm

Quote:

Is it possible to display Injector duty cycle using ODB2?

... the answer is no if you had a 12v Scorp
....and yes if you had a 24v Scorp
.. and we didn't know what you had ..thats what I meant .. little did we know that you had a Puma .. :o ..what fuel pump are you running ? ..is it capable ? as you will undoubtedly know ..you can't get it out if you dont get it in .. will it take an RS pump ? 4.5 +bar from memory .. and what chip Josh ? superchip the company ? ..or superchip generalisation ?

Title: Re: Injector Duty Cycle
Post by joshxs on Mar 16^th, 2004, 9:48pm

Thanks for the info.

Fuel pump is just the standard item, I think the fuel rail is set at 2.7bar. Power at 5psi is approx 160bhp, I would imagine that the current fuel system is already close to max. Whether I can increase the fuel pressure enough to increase injector performance is unknown.

The chip im using is a Van Aaken developments one, which I think is a superchips clone of some description. Van Aaken are reluctant to give any information away, but I suspect that a superchips tuner would be able to remap it, after all, it's only a 16bit eeprom device.

I would just like to find out if I do need to upgrade before going through the expense of a RR tune. I don't think 200bhp and 200lb/ft is unreasonable from a T25?

cheers

Title: Re: Injector Duty Cycle
Post by SaveTheNight on Mar 17^th, 2004, 7:17am

yes .. I think I agree Josh .. with the Scorp the pump < supposedly 3.5 bar > delivers in fact approx 2.5 .. so with extra ooomph say an FSE valve ..the fuel pump cannot cope with the rail settings although the injectors would .. with an FSE and Escort RS pump and then chipped.. then at least it can be maximised .. talk to Martin or Lee at Collins Motorsport about chip mapping and tell him Powercraft Engineering in Devon recommended you .. if you catch them right they will be helpful and usually specific .. < and they are quite reasonable too > .. personally I reckon the injectors will cope fine .. just my view though .. what exhaust do you have ?? .. modified ? .......... regards ..... STN

Title: Re: Injector Duty Cycle
Post by VladSoare on Mar 17^th, 2004, 10:56am

Quote:

with the Scorp the pump < supposedly 3.5 bar > delivers in fact approx 2.5 ..

I don't know, when I had my 24V tested, the fuel pump delivered 3.5 bar. The guy operating the WDS allowed me to stay there, so I saw everything.

Title: Re: Injector Duty Cycle
Post by joshxs on Mar 17^th, 2004, 11:27am

Yeah, I have a full catalyst back stainless magnex one, think it's 2.5" bore. I am seriously considering removing the catalyst however (even though it's a racing type)

Title: Re: Injector Duty Cycle
Post by SaveTheNight on Mar 17^th, 2004, 11:36am

Vlad .. I would be amazed if you tried it with a pressure gauge and got anywhere near 3 bar at the rail ..WDS is pretty " limited " on the Scorp fuel system anyway and the fuel pressure tests are usually based on " less than or greater than figure " and the tester makes his own conclusion .. < unless he bothers to actually fit the separate gauge > .. I personally haven't had one read over 2.4 and usually are around 2.1 .. but there ya go ..you must have a great pump ..

... which cat then Josh ? ..a full flow from where ?.. is it oval or round ?.. do you know whether its still a ceramic substrate or metal foil ?? .. interesting .. did you own the car when this work was done so you can comment on the difference with the race cat and Magnex please ? .. STN

Title: Re: Injector Duty Cycle
Post by VladSoare on Mar 17^th, 2004, 4:15pm

I don't know what kind of gauge he was using, but it was connected to the WDS, so that the output showed up on the WDS display. It showed between 3.45 and 3.5 with the engine running. The pressure wasn't calculated through OBD, there actually was a pressure gauge fitted to the fuel hose.
But I have no idea how accurate the gauge was, maybe you're right about the WDS lack of accuracy.
In fact, I wasn't interested in the exact pressure value, I only wanted to rule out the fuel pump as the cause of my starting problem.