Racetronix 42's (blue stripes)

[ZOSlow]

Using these because I already had them from something along time ago, otherwise I would go with Fords and do the "Greg DVD" deal or whatever to get the tables.

I searched but without much luck...Has anyone come up with proper voltage offsets for these? All I've touched is IFR; I used one of the various IFR calculators on here and wound up with the same IFR I have in all the other tunes I did with these injectors awhile back.

Is there anything else that can be done? The VE on this car looks a little odd from 800-2000.

[eficalibrator]

I don't think even the original manufacturer of these (Lucas) has the right data to use them in a modern application. They're an ancient design that only wins on price...

[RWTD]

On top of that, they vary in flow widely from one set to another. They are JUNK!

Buy a set of Ford 42s (green-tops) from www.BuyFordRacing.com for $209.

[Throttle]

same with me my ve is strange from 800-2000 rpm's i am giving up

[ZOSlow]

Seemed like I could always get them to do okay back in the day, but I think I'm done with these as soon as I can cough up some $ for the Fords.

What about the 60's? Which are more accurate and easier to control?

[RWTD]

I'd say either or, the Ford 42s or the Siemens 60s. Use only what you need, but keep the vehicle in thought for future needs.

[98Camarod]

Are these the same as the Lucas 42.5#ers? If so, RWTD posted some offsets a while back that worked pretty good. I only have the 0 now value since I have a boost referenced regulator, but when I was N/A, it seemed to work fine with those offsets

[ZOSlow]

Yes, Lucas 009's. I searched and couldn't find any offset posts pertaining to them.

[98Camarod]

It was EC Tune that posted it, sorry:

http://www.hptuners.com/forum/showthread.php?t=17362

[Throttle]

i am trying those settings is there going to be a difference because of fuel pressure being different on a vette

[Throttle]

and is there a better open loop EQ ratio table than others being used ex like one from a 2002 vette vs 2002 firebird etc for after its all tuned?

[98Camarod]

I didn't know the fuel pressure was different on a vette. The IFR is for 58 psi, but you will have to adjust accordingly if it is different. As for the offsets, I don't see how that would have anything to do with the fuel pressure

[RWTD]

There isn't a difference on the fuel pressure on a Vette. AFAIK, all Gen-4 vehicles run on a 4-bar system (58 psi).

Also, when you change fuel pressure, ALL the injector values change, INCLUDING the offsets! Ford Racing even proves this in their calibration data (they have multipliers for pressure changes). See here for example:

http://www.fordracingparts.com/parts...-9593-f302.pdf

Now look at the FNPW_OFFSET, and then look at the FNPW_OFFCOMP.

[Throttle]

that just cleared up a few things i was misinformed about fuel pressure thats what i get for listening

[98Camarod]

There isn't a difference on the fuel pressure on a Vette. AFAIK, all Gen-4 vehicles run on a 4-bar system (58 psi).

Also, when you change fuel pressure, ALL the injector values change, INCLUDING the offsets! Ford Racing even proves this in their calibration data (they have multipliers for pressure changes). See here for example:

http://www.fordracingparts.com/parts...-9593-f302.pdf

Now look at the FNPW_OFFSET, and then look at the FNPW_OFFCOMP.

Can you explain how the offsets are changed with a change in fuel pressure?

[ZOSlow]

Tried those tables linked above in a '99 1bar enhanced OS and car wouldn't idle leaner than 12-13:1 untill I got VE numbers down into the single digits and even then it was all over the place and sounded terrible. It would completely cut fuel and die with any throttle movement (not even giving me a chance at playing with VE).

Flashed it back to what I had since I had to leave to go somewhere so I'll have to try that another day. The car is running fine with the stock voltage and pulse tables aside from a really big jump in VE from 12-1600 with an accompanying slight off-idle hesitation sometimes (due to lack of resolution I'm guessing).

[RWTD]

Can you explain how the offsets are changed with a change in fuel pressure?

Anytime you change the flow rate of an injector the offsets will change, as well. I don't have the exact "science" for this (Greg can answer this for you, however), but as I showed you in Ford Racing's calibration data, this is indeed fact.

Tried those tables linked above in a '99 1bar enhanced OS and car wouldn't idle leaner than 12-13:1 untill I got VE numbers down into the single digits and even then it was all over the place and sounded terrible. It would completely cut fuel and die with any throttle movement (not even giving me a chance at playing with VE).

That's because you CAN'T use Ford data in a GM without converting it into GM units. This is what Greg Banish has done!

[Throttle]

i am coming to the conclusion that we just say no to racetronixs 42#'s

[eficalibrator]

Can you explain how the offsets are changed with a change in fuel pressure?

Higher pressure is also trying to push the needle shut, which requires more force from the electromagnet to open it. It takes a little bit longer saturation time for the coil to build up this extra force to open against the higher rail pressure.

i am coming to the conclusion that we just say no to LUCAS 42#'s

Fixed that for you... Don't blame the reseller. Jack (Racetronix) sells plenty of good injectors from other manufacturers.

[ZOSlow]

That's because you CAN'T use Ford data in a GM without converting it into GM units. This is what Greg Banish has done!

I meant the tables EC Tune posted in the other thread that was linked above...In reading that thread, I was under the impression they were tables he had done for the Lucas-style injector.