What are YOUR cruising EGT's?

[OrangeSVT03]

I've been fighting an EGT issue on my car and another turbo SVT, I've noticed that the EGT's at cruise stay between 1200 and 1300* which I feel is high.

I know its a timing issue, I've datalogged my car and my friends and I've noticed that during steady cruise the timing stays around 14-18* while it should be considerablly more.

Now there are multiple spark tables in the ProRacer Package and usually we all use the borderline knock table... but when you datalog the spark source it "generally" refers to 3 tables during steady state driving... 1,2 and 8.

It seems to be mainly spark source 8 thats giving me the 14* of timing issue... so does any know what table spark source 8 is???

Or anyone else having higher than normal EGT's???

Anyone have a list of which spark tables correspond with which number???

[ProfessorBlinks]

1200 to 1300 degrees is a little hot but it is normal in a focus. If you get into load with your car you will notice that the EGTS actually go down. This is because when a focus is tuned they can only adjust the open loop A/F ratio (which directly influences EGT lower A/F cooler exhaust higher A/F hotter exhaust). There is no way with a chip/flasher to adjust closed loop(cruising) A/F ratio for our ECU and it runs a little hot for a turbo car but just right for a N/A car :-)

I hope this all made since.

[Broke_Two_Foci]

I dont have FI or the pro racer package but my NA Zetec see's 1,350f while crusing down the highway. usually cooler on city streets.

hope that helps somewhat.

[OrangeSVT03]

The point is I believe that the PRP is referenceing the wrong table... I know why its running hot.

and 1300* at cruise should NOT be accepted as normal.

[FocusSportVP]

I'd agree, 1300 at cruising is too high.

Spark source 8 is Idle Feedback at Minimum Clip.

So what is keeping you from increasing the spark at low loads?

[OrangeSVT03]

I'm under the impression that you use the borderline knock table for most of your daily driving.. correct??

If so at the lower load levels I left them stock and they call for 45*.

Why would it even reference the idle feedback table when your running over 2500rpm under a load of around .3?


Of course I've looked through the whole PRP and cant find any table even close to the idle feedback......

[FocusSportVP]

There isn't a table for spark source 8, necessarily. Its a clip. SOME of the daily driving would have you in the BKT, but certainly not ALL. Don't ignore the MBT. Its there for a reason. There are many "rules" that you have to follow in the Ford ECU regarding spark, especially in the SVT ECU.

[OrangeSVT03]

MBT???

But SCT says that changing the values in MBT wont effect the timing.... are they telling a little white lie??

[FocusSportVP]

What? No, that isn't true. Some of the SCT notes are very specific to the context in which they were mentioned.

Look, as I said there are many rules you must follow. Basic stuff. Talk to Tom. I'm sure he'd be happy to help you with the basics.

[Old man]

I've got a zetec and I run 1250-1350 at 75-80 mph easy cruising. Flooring the throttling does cause a minor dip but as speeds go up so do the egt's. At 120 mph it's over 1500 and I have to back off. I always suspected a lean condition was causing my high egt's. I only have 30lb injectors.

I've driven almost 50,000 miles so far without any problems (127,000 total) so it seems to be okay. I didn't do any of the tuning but I did request a very conservative tune.

[HaveBlue83]

^^^yes, me as well.......but I am NO lean with the tuning...and I dont have a bunch of timing pulled...like low teens I was told from McNews.


I KNOW it's an old thread.....but it's usefull....

i noticed my in like 1300 at cruise at 70mph....my car does NOT like to cruise at 70mph....EGT is lower at 85 than at 70......

[OrangeSVT03]

Back from the dead???

When I get my J&S back I'm going to play around with the tables more.... i've learned a few things since this was posted last year.

[Power Surge]

A rule of thumb for Ford tuning... the pcm will use the LOWEST value of any of your spark tables. So if say at 3000 rpms and 50% load your borderline is 45 degrees, and your max allowed (or base) is 32 degrees, it's going to use the base table, not borderline. Also, add into that all the spark adders. If you have an ECT adder factoring into the base table that adds 4 degrees at that same spot, you'll now see 36 degrees not 32. The spark mapping is pretty complex to begin with, and then you add VCT into it!

An easy way to control your spark, is pick one of the tables you have available, and use it completely. In order to do that, you'll need to make the values in all the other tables higher, so it won't look to them. That includes factoring in spark adders!

You shouldn't be seeing spark source 8 while you're driving, unless you are off the thottle at the time.

Is your load proper for light cruise? It should be around 20-50%. Your cruise EGTs are definitely from the low spark values. Lower spark will raise combustion temps. If you can fix your spark issue and get a nice 35-40 degrees at light cruise, I'd be you'll drop those EGTs down a good 300-400 degrees.

[99dot]

Originally Posted by Power Surge

A rule of thumb for Ford tuning... the pcm will use the LOWEST value of any of your spark tables. So if say at 3000 rpms and 50% load your borderline is 45 degrees, and your max allowed (or base) is 32 degrees, it's going to use the base table, not borderline. Also, add into that all the spark adders. If you have an ECT adder factoring into the base table that adds 4 degrees at that same spot, you'll now see 36 degrees not 32. The spark mapping is pretty complex to begin with, and then you add VCT into it!

An easy way to control your spark, is pick one of the tables you have available, and use it completely. In order to do that, you'll need to make the values in all the other tables higher, so it won't look to them. That includes factoring in spark adders!

You shouldn't be seeing spark source 8 while you're driving, unless you are off the thottle at the time.

Is your load proper for light cruise? It should be around 20-50%. Your cruise EGTs are definitely from the low spark values. Lower spark will raise combustion temps. If you can fix your spark issue and get a nice 35-40 degrees at light cruise, I'd be you'll drop those EGTs down a good 300-400 degrees.

Thanks for the numbers, as I've been working on them.

Now, looking in the stock tables I see the values are in this range. So, if you lowered your compression you mite need a bit more timing.

I have log's of light cruise and I'm see 32 to 36 spark and I'm still around 1200- 1300.

I was thinking of bumpping low load setting 2 degree's at a time on all talbes see how much more timing is needed.

Only, I've come to the conclusion that I may need a lot more timing; because I've changed the effeciency of my motor alot (ported head and larger cams).

I never seen any knock on this motor, and I've tried to find it.

I have the J&S knock retard monitor and it works and its never lit up on the most sensitive setting.

Is it possible that my timing tables may have shifted so much that it just doesn't make sence. Or Should I just keep bumping them tell EGT's respond?

And at what point would you say that the timing tables are looking strange.

Cause the values I thinking of running are making me nervous

[OrangeSVT03]

Back when i started I was told (and also read in SCT's book) that MBT had NO effect on timing....... once I found out thats not true I could finally started getting everything straightend back out.

Once I get my J&S back I can finish it... but I'm not going to make anymore changes until then.... since I'm not running a knock sensor right now.

[FocusSportVP]

Originally Posted by OrangeSVT03

Back when i started I was told (and also read in SCT's book) that MBT had NO effect on timing....... once I found out thats not true I could finally started getting everything straightend back out.

You're welcome.