timing logs(020)

[m0rk]

Simon
Your high CF will be down to knackered maf. The Maf is one of the 2 major load measures for the ecu. Lower maf reading makes the ecu think there is less load so it runs more advance.
Change your Maf.

But can't prove it because of the mechanical scaling?

 

[ryan_s3]

what figures am i looking for timing advance wilko?

 

[Wilko]

ryan
You'll probably see 5-8 btdc in the mid range, and 10-15btdc towards the top end if you use millers. It's field 4 in block 3. Just lock block 3 in 4th, 3000-7500rpm and post it.

Mork. I doubt simon l's maf has been mechanicaly scaled. It should give true readings. A low reading maf will increase CF, unless it was mapped with a low reading maf.

 

[dan-ish]

On a big port, it won't hold more than 1.2bar at 7000rpm. Stronger actuator tried. Compressor flow max reached. Turbo is too small.

Mines 1.3 at 7300
Edit: I could have a faulty gauge tho

 

[Wilko]

Mines 1.3 at 7300
Edit: I could have a faulty gauge tho

Dan
Sometimes I see 1.3, more often 1.25, but mostly 1.2ish. These are logged just pre manifold, with vag com. A boost guage may well read higher/lower. Who knows which is right.
On a standard smallport, I was seeing 1.5bar at 7500 with the same airflow.

 

[dan-ish]

Dan
Sometimes I see 1.3, more often 1.25, but mostly 1.2ish. These are logged just pre manifold, with vag com. A boost guage may well read higher/lower. Who knows which is right.
On a standard smallport, I was seeing 1.5bar at 7500 with the same airflow.

More than likly right.

So you going to stick with low boost and be happy with VF34/20 then?

 

[Wilko]

More than likly right.

So you going to stick with low boost and be happy with VF34/20 then?

Nope not happy with it, as the chasis could handle more power. 2nd almost grips in todays conditions. Problem is after going through an engine and gearbox this year along with a few turbos, I need to save some pennies for a while.
1.25 bar for me apart from at the pod, or on a dyno.

 

[dan-ish]

Nope not happy with it, as the chasis could handle more power. 2nd almost grips in todays conditions. Problem is after going through an engine and gearbox this year along with a few turbos, I need to save some pennies for a while.
1.25 bar for me apart from at the pod, or on a dyno.

Will you accept lag/lack of drive abilaty for big power then?

 

[Wilko]

eventually yes!

 

[bentaw]

isnt there a thing called boost spike i know in cold weather that your boost can for a split second hit 1.7bar could this have anything to do with it

 

[ibizacupra]

Bill. I ended up on forges middle spring, with my wastegate ported as far as possible. The 20 housing wastegate hole is actually smaller than the 18. Boost creep is now gone, and the mid spring seems to match my boost controller quite well. Still needs a remap to smooth the boost control out a little though, and to take some fuel out. 10.5:1 at the top end. Safe as hell, but power sapping and smokey.

mine has some 10:1 excursions on logging with the Zeitronix, but EGT's pummet down there too, which is power sapping. 780'C EGT when I can run 900'C-950'C max. Mapped conservatively without the EGT being function, which I hope will be optimised next week when we re-run it.

You had g'box probs too then did I read?
what bit failed?

 

[Wilko]

mine has some 10:1 excursions on logging with the Zeitronix, but EGT's pummet down there too, which is power sapping. 780'C EGT when I can run 900'C-950'C max. Mapped conservatively without the EGT being function, which I hope will be optimised next week when we re-run it.

You had g'box probs too then did I read?
what bit failed?

Yep bill, my egt's never go over 800 (calculated from 02), but and thats only if I rag it from 2nd gear to 150. otherwise it's mostly low 700's. Way too much fuel, but hell it's safe. Hopefully get it seen to soon.

Gearbox problems are not for the forum. I'll tell you about it in person some time. Let's just say, which part of my gearbox could not possibly have failed? That's the part that did.

 

[Madmile]

Sounds like a few BT cars are suffering at the moment for one reason or another.

 

[Simon L]

Well this morning i logged the whole journey to work, and caught it hitting limp mode with error "negative boost deviation". Not had time to look at the boost logs yet to see what it was making.

Peak MAF was 150g/s, and the max CF i was seeing was 6.

So the MAF is back to normal. But i have noticed the boost gauge reading a couple of PSI less top end, than it normally does.

 

[ryan_s3]

Mines 1.3 at 7300
Edit: I could have a faulty gauge tho

What are you seeing at 6200?When do you start to drop under 1.6?

 

[ibizacupra]

Hike the boost up bill!!
Begining to wonder what difference 2psi(.15bar) is going to make to my vf34/p20@6200?I see 1.53bar peak anyway,so 1.6 held is not going to make that much difference?

you saw it do 360atw from 23psi from PE1820 and 83mm bore 1900

 

[vern]

Gearbox problems are not for the forum. I'll tell you about it in person some time. Let's just say, which part of my gearbox could not possibly have failed? That's the part that did.

Clutch or diff?

 

[Madmile]

Or diff or clutch.
Or clutch and diff.
Or diff and clutch.

Lots of variations.

Sorry to hear your having probs John, i know the feeling.

 

[ryan_s3]

you saw it do 360atw from 23psi from PE1820 and 83mm bore 1900

Well jabba seem to think that even with rods ,valves and pe1820 i will see no more than 380 flywheel hp with my current intake manifold and head.Although james made 440bhp on both of these.

 

[Madmile]

Pe1820f wont move the air James turbo move's i guess.