Little. Blue. Different. - Page 5

**JET** · 03-26-2009

That does seem weird, throttle body is opening 100%, right? Other than that it seems like it must be a restriction somewhere.

**scheides** · 03-26-2009

TPS does hit 100% in logs and if I twist on the black piece that the cable attaches to it does open the butterfly all the way....maybe I'll have someone sit in the car and push the pedal all the way down and take a look. What on earth would cause that though? Sounds pretty far fetched. Still, I'll test it out.

FattyBoomBatty · 03-26-2009

Maybe the carpet got bunched up under the pedal.

niterydr · 03-27-2009

Same/similar intake setup? Intercooler piping clogged (maybe a rag in a pipe?).

Dumb questions, but it does seem like an airflow restriction if ignition and cam timing are perfect and compression haven't dropped.

**scheides** · 04-08-2009

Ok, I did compression test tonight: 170 167 170 176

Also I did a leak-down test. I'm not 100% sure I did it right or that my harbor freight unit works so well, but I came up with: 15 15 15 15, dead even across the board. However, no air coming out of TB, no air coming out of exhaust, but def air coming out of dipstick/oil fill cap

Where could it be coming from? past the rings?

I think I'm going to have shane do a comp/leakdown test for me to just get a second opinion. Maybe my fancy catch-can setup sucks/is broken? Not sure yet, but I'm gonna get to the bottom of it

swanny, I still have a glimmer of a doubt in the back of my mind on the rag in the FMIC theory.

FattyBoomBatty · 04-08-2009

throttle was depressed completely on the comp check? Those numbers don't seem too bad to me. Pretty much all the same (only a small percentage difference).

The leakdown tester is a strange thing, but how I read it was by checking known good compression cylinders then checking the supposedly bad one(s), and comparing the pressure required to keep the needle in the green area/zero on the second gauge. On the bad cylinder it took more air, plus on the dude's engine we could hear it coming out the exhaust pipe (bad valve). The whole time we had pressure in the engine, it was leaking past the rings, but his compression was perfect on 3 of 4 holes.

If I were you, I wouldn't worry about the rings.

**Kracka** · 04-08-2009

15 across the board is pretty good for a leakdown test assuming you performed it correctly!

niterydr · 04-08-2009

Quote:

Originally Posted by scheides

Ok, I did compression test tonight: 170 167 170 176

Also I did a leak-down test. I'm not 100% sure I did it right or that my harbor freight unit works so well, but I came up with: 15 15 15 15, dead even across the board. However, no air coming out of TB, no air coming out of exhaust, but def air coming out of dipstick/oil fill cap

Where could it be coming from? past the rings?

I think I'm going to have shane do a comp/leakdown test for me to just get a second opinion. Maybe my fancy catch-can setup sucks/is broken? Not sure yet, but I'm gonna get to the bottom of it

swanny, I still have a glimmer of a doubt in the back of my mind on the rag in the FMIC theory.

15% is decent, but exactly the same figures on every cylinder is freaky.

I don't usually bother with compression numbers if the leakdown is good. My Audi leaked between 12-3% fyi, each cylinder was a bit different.

Could be a bit of leaking past the rings, but with 15% you usually don't notice it that much, compression numbers look decent. I wonder if your measuring instrument is accurate. Maybe have Shane double check it like you mentioned.

MustGoFaster · 04-08-2009

+1 on those numbers being good, but a little odd. As for where it's going, at 15% I wouldn't worry about it to much.

**scheides** · 04-08-2009

Ya, its not like its like WOOSHING out the dipstick or oil fill cap when I open them with the pressure applied, its just a very faint whisp of air, and then I can hear air coming out if I open/close the cap repeatidly.

On the compression test, I didn't realize you were supposed to open the throttle 100%, is this true? Could this affect the numbers in a good or bad way?

**scheides** · 04-08-2009

Just read good'ol vfaq, can't believe I forgot about the 100% throttle thing. Gah.

On a side note, all of the spark plugs look perfect--nice frosty brownish color, no oil on any of them. The car has been burning oil over the last 10k miles, sometimes 1/4 qt per 1000 miles, sometimes up to 2/3 of a quart per 1000 miles.

MustGoFaster · 04-08-2009

Good description, that's normal.

Leaving the throttle closed should make the numbers lower. Since you are throttling the inlet and making a slight vacuum in the manifold. WOT might bump the numbers up a little.

TkrPerformance · 04-08-2009

if it is burning that much oil now. I would really look into the oil catch can being the problem. put it all back to stock and see if that helps. I tryed to hook mine up the way you did and it was buring oil and had press in the engine. now it just has it hooked up normal.

**Halon** · 04-08-2009

Are any of your little vents hooked up backwards by chance? Any of them clogged? What if you removed the one from the intake pipe. Maybe it's hindering flow and not getting as much blow by out under full throttle?

Also, maybe not the ideal idea, but have you thought about taking it out and throwing it on someone else's car that is running well, to rule out the possibility of a bum turbo?

**scheides** · 04-08-2009

I think I'm gonna put the crank case vent system back to near stock and see how that works. I did pull one of the vents while on the dyno and it made zero difference, but I'm curious to just try it. I'm going to be putting on a few hundred miles this weekend, so it'll be a good time to test.

Brandon, I was down on power with the IX turbo, and now I have the BBK...oil burning continues, power went up with the BBK dramatically but still less than where it should be with it by about 40-50whp. So, it's not the turbo.

**scheides** · 04-13-2009

I just realized that last summer I swapped out my plug boots and wires...I've done plug changes since then with no noticable...the gap has remained consistent...the car never stumbles or anything under WOT. Replaced stock stuff with stock stuff.

MustGoFaster · 04-13-2009

**scheides** · 04-13-2009

Just more data...couldn't failing/bad ignition components lead to loss of power?

MustGoFaster · 04-13-2009

Yes it can, It's just I wasn't getting the drift of your incomplete sentences.

mike55112 · 04-13-2009

Quote:

Originally Posted by scheides

Just more data...couldn't failing/bad ignition components lead to loss of power?

I have extra coil packs if needed. I also am going to try out the hks dli plug and play system.