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**Alex L** · 12-31-2007, 12:02 AM

Originally posted by BrianO View Post

Upon driving it I here pinging when it gets into boost where I never heard it with the E3.. also, now it seems to be only 6-7 psi instead of at least 9psi with the E3 previously.

you're flowing more air out the exhaust, less back pressure. less back pressure = more charge air in the combustion chamber = higher combustion pressures = reach knock threshold at lower boost. this is why you turn down the boost when you free up flow somewhere else, less resistance to the charge air means that the same mass of air will flow at a lower pressure then before, and the mass (and heat) of the air is what is important.

if you're knocking at 6-7psi, on a fairly stock setup besides the bobs log, something is wrong. perhaps you are not running rich enough under boost, or ign timing is a bit advanced? got a wb02 on that beast?

**SVOeric** · 12-31-2007, 12:19 AM

if you are running near stock levels of boost, and pinging, you need to check what got knocked out of wack..

**BrianO** · 12-31-2007, 12:38 AM

interesting.. lower the boost. I can't do that since it's the stock setup, but I also can't imagine what is out of whack either.

any threads on this anywhere??

**NavySVO** · 12-31-2007, 05:25 AM

What is your fuel pressure doing during all this? Hook up a FP gage and put the hose under the windshield wiper and tape the gage to the windshield.

Compare boost to fuel 1psi per 1psi.

Also, did you check your timing like Eyelawdoc suggested in the 2nd thread you started on this before starting this thread? (getting dizzy)

I know you said Motion set the timing, but it needs to be rechecked periodically. Plus, it's free and little or no work is involved.

**tateg** · 12-31-2007, 07:35 AM

I would suspect that your boost gauge is off as well. The first thing you need to do is get some accurate readings of your engine state. Boost, timing and fuel pressure need to be known. Also I'd get a Gillis valve so that you can accurately control your boost while you're trouble shooting things. After 24 years your BCS can't be too accurate, especially if you're only seeing between six and nine PSI.

My experience in freeing up the exhaust resulted in a much higher level of boost with no other changes than going from stock to a 3" exhaust. I had to turn the boost down because it got higher. This is the same thing that caused 5.0 Magazine to blow a head gasket on their SVO test car and end the series of articles they were doing. Your boost should have gotten higher as well with no other changes. With less back pressure your turbo spins up better and faster.

**BrianO** · 12-31-2007, 12:18 PM

sorry for the new thread, but my first one got polluted with a ton of off topic posts so instead of having 6 pages of nothing I just started a new thread to get to the point.

I've not checked the timing yet, but the car runs and idles exactly where and how it did before the log.

I'll try and check this today. I do have a fuel pressure guage, but it's under the hood.

So I'm guessing the fuel and timing are going to check out just fine. this looks like it's the boost increase, but I have no way of lowering the boost. There has to be a way to do this without having to buy something else.

**BrianO** · 12-31-2007, 12:19 PM

I don't understand why it's pinging , but what if the FP just needs to be increased a tad to compensate.. I'll check it out.

**tateg** · 12-31-2007, 01:40 PM

Originally posted by BrianO View Post

I don't understand why it's pinging , but what if the FP just needs to be increased a tad to compensate.. I'll check it out.

Something you need to be aware of is that when your engine flows better it will make more power with lower boost. Your engine is just a big air pump and if it can take in more air you will have higher compression and more power but with stock boost levels. Think of it this way, if you have a 100HP NA motor and you add 14.7PSI of boost (and the right amount of fuel for that much more air) at sea level you will produce ~200HP. This is because you have doubled your energy inputs. So in adding the header your motor flows air much better and more air (and presumable fuel once you set your fuel pressure) gives you more power at the same boost levels.

I suspect you will have to turn up the FP (you will need a adjustable regulator) to work correctly with the greater air flow your header allows. You really need a way to control the air flow accurately (gillis) and a way to monitor your AFR (a wideband). If you have added more air without more fuel you will get a significant ping. The only way to combat this is through proper tuning with a wideband O2 sensor.

**BrianO** · 12-31-2007, 04:14 PM

arg!! thanks.. way more than I wanted to do. Remember I'm not out for performance or making more power, just reliable daily driver. If I could have found an E6 I would have gotten one, but this was my only alternative.

so you can turn down the boost or increase the fp just a bit to compensate.

**BrianO** · 12-31-2007, 04:37 PM

I checked the timing after finding no SPOUT connector and cleaning up the poor wiring job on the dizzy harness. Looks as though it was replaced, but not very well done. the SPOUT is gone in favor of a but connector, but it works.

timing sounds perfect, but I can't see where I'm supposed to be verifiying it. I know this sounds dumb, but on the 2.3 are the timing marks supposed to be on the crank/damper just like a 5.0?? I didn't find any how-to's on here for this nor did I find any kind of timing marks anywhere. but as I said..it sounds dead on.

**NavySVO** · 12-31-2007, 04:58 PM

Originally posted by BrianO View Post

I know this sounds dumb, but on the 2.3 are the timing marks supposed to be on the crank/damper just like a 5.0??

Timing marks are on the timing belt cover near the crank pulley.

Here is a pic of mine. The marks are kinda faded, but I know where the 10* mark is supposed to be (marked it up here)

As for your SPOUT pill, just get any other automotive connector that you can plug and unplug.

My timing sounded just fine when I first got my car. The timing was set at nearly 20* with SPOUT out.

Attached Files

**BrianO** · 12-31-2007, 06:06 PM

thanks.. yep, that's exactly where I was looking.. nothing there. I'll have to look closer or find something to match it up to...

OH...wait..the cover... mine is removed, it's in one of the boxes out in the shed.. that explains that part, thanks!!!!!

**BrianO** · 12-31-2007, 07:18 PM

ok, well I increased the fuel pressure 2-3 psi and took it for a drive.. still pings right about 6psi on the stock gauge.

I remember reading something about the egr and it affecting this.. I unplugged the vacuum to my EGR and the car did nothing. I wonder if it even works...anyways..

**tateg** · 12-31-2007, 07:18 PM

Originally posted by BrianO View Post

thanks.. yep, that's exactly where I was looking.. nothing there. I'll have to look closer or find something to match it up to...

OH...wait..the cover... mine is removed, it's in one of the boxes out in the shed.. that explains that part, thanks!!!!!

Doh! You need that. Or this with a pointer:

Attached Files

Announcement

aftermarket headers--part 2

aftermarket headers--part 2

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