Question about IFR with SVO 30#

[VortechC5]

I sold my supercharger and have not had time to put the new one on. For the time being I put SV0 30# injectors in because my duty cycles with the 42s was only 50 now that the car is NA.

I used the attached spreedsheet to calculate the IFR values and pasted them into my tune. When I log data all of my LTFTs are very positive, in the range of +13 to +25. This would make me think that the injector flow rate is wrong for all of the LTFTs to positive.

Does anyone have any ideas about this? I can autotune for the LTFTs but I wanted to make sure that my IFR was correct before doing that.

I used 43.5 as the rated fuel pressure, 62 as the rail pressure (what mine actually is), and 30# as the injector rated flow rate.

[Tordne]

Pretty sure the SVO injectors are rated 30lb (in your case) at 40psi.

[Bruce Melton]

I run them and have tuned a few cars with them but always started over. They are about 36# with LSX pressure.
I would love to have a good conversion though! Would save a lot of trial and error.

[joecar]

Are you still using the VE table that you used with the SC...?

[eboggs_jkvl]

I got this from the worksheet
Map G/sec

0 4.364768
5 4.391971
10 4.419006
15 4.445876
20 4.472586
25 4.499136
30 4.525531
35 4.551773
40 4.577865
45 4.603808
50 4.629607
55 4.655262
60 4.680776
65 4.706153
70 4.731393
75 4.756499
80 4.781474


I used 58 PSI fuel rail, 43.5, 30# injectors


I used the table sitting on this site.


Was that close to what you have?

Elmer

[TAQuickness]

If it's any help, I swapped from racetronix 32 lb/hr injectors to SVO green top 42's this morning. For grins, I made a new IFR table using 40 psi as the rated pressure first, and my BEN's were off. Pulled over and made a new IFR using 43.5 psi and my BEN's were within 1% of the racetronix IFR.

I vote for using 43.5 psi as the rated pressure.

[Tordne]

If it's any help, I swapped from racetronix 32 lb/hr injectors to SVO green top 42's this morning. For grins, I made a new IFR table using 40 psi as the rated pressure first, and my BEN's were off. Pulled over and made a new IFR using 43.5 psi and my BEN's were within 1% of the racetronix IFR.

I vote for using 43.5 psi as the rated pressure.

Even the Ford Motor Sport site states that they are rated at 40psi. Good to know that your table is close though. One day when I install my SVO 42lb's you can flick me the table :)

Did you change the Offset table at all?

[TAQuickness]

haven't touched the IOS

[joecar]

Pulled over and made a new IFR using 43.5 psi and my BEN's were within 1% of the racetronix IFR.

I vote for using 43.5 psi as the rated pressure.
Good deal.

Why does F.o.r.d. quote the wrong rated psi...?

[Redline Motorsports]

Even the Ford Motor Sport site states that they are rated at 40psi. Good to know that your table is close though. One day when I install my SVO 42lb's you can flick me the table :)

Did you change the Offset table at all?

I spoke to Ford a couple weeks ago and they swear they are rated at 39.80 PSI. I agree the 43.5 seems to work the best. Where do we stand with the injector offset topic?

[TAQuickness]

I have a copy of AEM's software that will calculate an IOS for you automatically - however, it's more the format a Furd PCM uses. Last off, I think jfpilla was on to some good stuff.

[Tordne]

What is this AEM software, is it free?

[Redline Motorsports]

I have a copy of AEM's software that will calculate an IOS for you automatically - however, it's more the format a Furd PCM uses. Last off, I think jfpilla was on to some good stuff.

I would really like to get this IOS figured out once and for all if its that critical to tuning. If every injector has its own specific OS, then we should be able to build a library of the popular injectors we use. What information does AEM look for to calculate this info and what information is provided as output that we can use for EFI Live?

[VortechC5]

No, I am using a VE table and MAF table for a stock 02 Z06.



Are you still using the VE table that you used with the SC...?

[VortechC5]

It looks like most people think that 43.5 is the number to use for fuel pressure. I did a bunch of searching to find out what fuel pressure to use. That is how I ran across that spreadsheet that TAQuickness had modified. I guess I will just autotune the LTFTs into submission.

[eboggs_jkvl]

Isn't 43.5 the pressure that was running when the tested injector was giving #30 in fuel amount? We plug in our rail pressure and the calculation is made as to what the injector is giving when the pressure is 58 (or whatever you are running as a base). The information now of a "40" number is playing with the calculations and lowering them. I understood it to be 3bar or 3X14.5 = 43.5

Are we saying that is incorrect?

[TAQuickness]

Without actually flow testing the injectors, we are just tweaking the IFR table to get the AFR/BEN's we want. Albeit, I don't mind this method of tweaking because if the new IFR table is correct, AFR's/BEN's won't change.

[Bruce Melton]

Without actually flow testing the injectors, we are just tweaking the IFR table to get the AFR/BEN's we want. Albeit, I don't mind this method of tweaking because if the new IFR table is correct, AFR's/BEN's won't change.
So we desire a reliable delta factor between stock 28.8s and the SVO 30s---

[VortechC5]

In my searching I saw information that the SVO 30# injectors are rated at 39psi, 39.8psi (Redline Motorsports in this thread), 40psi, and 43.5psi. I don't know which value is actually correct.

I used 43.5psi as the rated and 62psi (what my gauge says) as my rail pressure. This gave me all positive fuel trims in the +13 to +25 range. It was because of the all positive fuel trims that I asked the question about the SVO injector rated pressure.

Maybe it is my heads/cam/headers that is actually causing the positive fuel trims.

[redhardsupra]

if your IFR table is 'particular' to head/cam, you're tweaking with injectors !BAD!

read about it here:
http://redhardsupra.blogspot.com/2006/04/ifr-tweaking-jihad.html

[redhardsupra]

b4001 IS IFR, so your point is...? IFR doesn't have a 'starting point' it is what it is for the given injectors/fuel pressure.

[Bruce Melton]

Red,
I am happy to butt out, why don't you offer constructive help to Vortech.

[VortechC5]

No, I am not doing that at all. I am just trying to get my IFR established for the 30# at my fuel pressure. After that I'll use my WB and autotune the VE.



if your IFR table is 'particular' to head/cam, you're tweaking with injectors !BAD!

read about it here:
http://redhardsupra.blogspot.com/2006/04/ifr-tweaking-jihad.html

[jfpilla]

I spoke to Ford a couple weeks ago and they swear they are rated at 39.80 PSI. I agree the 43.5 seems to work the best. Where do we stand with the injector offset topic?

http://efiforum.iqd.co.nz/showthread.php?t=459&page=11

If you go back to this thread post #104 is still working for me. I picked up my car after 3 weeks and haven't done much more testing but my IOS table is working well. Note that the slope of mine versus stock is opposite. That makes sense to me considering bigger slower injectors. I don't think anyone knows how to arrive at a calculated IOS table. Nor are we sure of what is correct for calculating IFR's. I should be getting my injectors flowed in the next month. At least that will help.

[dfe1]

If anybody has a spare Ford 30-pound injector and can part withit for a few days, letme know. I can get it tested on an injector flow bench and then we'll know for sure what it flows at 40 and 43.5 psi.

[TAQuickness]

doh. I had my 42's laying around for a week before I put them in.

[SSpdDmon]

I sold my supercharger and have not had time to put the new one on. For the time being I put SV0 30# injectors in because my duty cycles with the 42s was only 50 now that the car is NA.

I used the attached spreedsheet to calculate the IFR values and pasted them into my tune. When I log data all of my LTFTs are very positive, in the range of +13 to +25. This would make me think that the injector flow rate is wrong for all of the LTFTs to positive.

Does anyone have any ideas about this? I can autotune for the LTFTs but I wanted to make sure that my IFR was correct before doing that.

I used 43.5 as the rated fuel pressure, 62 as the rail pressure (what mine actually is), and 30# as the injector rated flow rate.


No, I am using a VE table and MAF table for a stock 02 Z06.

I think you answered your own question. The injector tables are probably right...

[VortechC5]

Okay, I just wanted to verify that I was headed down the right path.

Thanks


I think you answered your own question. The injector tables are probably right...