1516 replies to this topic

[lookforjoe]

lookforjoe, on 13 October 2009 - 06:58 PM, said:

My motor was rebuilt 14K ago, and the turbo is less than a year old, but I'm still assuming it's the turbo, since I still get a fair amount in the piping, etc. I think a modified breather would be wise.. I don't have any detonation, that I can discern - I've had spark blowout, but no detonation that I've ever felt. Of course, that doesn't mean it hasn't happened on a discreet level, since I'm not testing for it in any way.

Anyhow - I'm off to put my AWD back in, I'm tired of all the wheelspin through third

Well, it seems the oilsmoke on decel was primarily due to my having f'kd with the base throttle setting - when I was trying to figure out why the car ran shitty w/the 625cc's, I had tried re-adjusting it - and, as it turns out, it was completely closed at idle. so, I can only assume that the lack of some air bleed was causing excessive manifold vacuum & drawing oil from somewhere - rings, valves, I dunno. It was really irking me. After re-adjustment yesterday, the condition seems to have disappeared. Trying to wrap my head around the exact condition that the closed throttle sets up, but whatever, my concern that the turbo or engine had developed blowby/oil leak has been resolved, so I'm happy

[lookforjoe]

Johann, on 20 October 2009 - 08:01 PM, said:

For OBD I use Palmer Performance PCMscan, Used a WinMobile Ease OBD also but PCMscan works for me.

About the ISO-9141, from what I recall the OT-1 tries to connect through CAN first. I belive the software allows to set it to 9141, need to check because it has been a long time since I last used the device.

Thanks for the tip, Johann. That did the trick. Now I just have to get it to display the data scaled correctly - rpms' start reading @ 5K for idle, and no IGN timing data... Innovate is sending me a hot-off-the-press revised OT-1, so I'll see what happens.

[lookforjoe]

lookforjoe, on 22 October 2009 - 03:42 PM, said:

Well, it seems the oilsmoke on decel was primarily due to my having f'kd with the base throttle setting - when I was trying to figure out why the car ran shitty w/the 625cc's, I had tried re-adjusting it - and, as it turns out, it was completely closed at idle. so, I can only assume that the lack of some air bleed was causing excessive manifold vacuum & drawing oil from somewhere - rings, valves, I dunno. It was really irking me. After re-adjustment yesterday, the condition seems to have disappeared. Trying to wrap my head around the exact condition that the closed throttle sets up, but whatever, my concern that the turbo or engine had developed blowby/oil leak has been resolved, so I'm happy

Wrong. Oil smoke still present on decel. I'm thinking it's due to overrich condition @ part throttle (AFR"S drop to the 10's), washing the cylinders, then dumping as oil smoke on decel, as I always get a "pop" out of the exhaust as well. Today I rechecked:

Cam timing EXH 4º adv INT 0º adv.
Put NGK's back @ .031"
Compression test 140 across the board (OS pistons drop it that much???) no difference if oil added to cylinder
Lowered Base FP to 3.8bar

No change at all.

Waiting for revised Woth tune. Once that comes, I'll lower FP back to 3bar & see if all is well. Also waiting for TT ECU to come back from Blighty. RAM error on 1st version.

[Captain Bondo]

10:1 should not be washing the walls down. If it's black smoke not blue/grey maybe it's just smoke from it being rich. Does it do it when the motor is cold?

140 across the board is on the low side, imo, especially with the exhaust cam advanced, but I guess it's even...
OS pistons should increase the compression ratio assuming they aren't dished more. That would actually increase comp test readings.

In guess it'll be easier to tell once you can tweak the tune yourself.

lookforjoe, on 27 October 2009 - 11:25 PM, said:

Wrong. Oil smoke still present on decel. I'm thinking it's due to overrich condition @ part throttle (AFR"S drop to the 10's), washing the cylinders, then dumping as oil smoke on decel, as I always get a "pop" out of the exhaust as well. Today I rechecked:

Cam timing EXH 4º adv INT 0º adv.
Put NGK's back @ .031"
Compression test 140 across the board (OS pistons drop it that much???) no difference if oil added to cylinder
Lowered Base FP to 3.8bar

No change at all.

Waiting for revised Woth tune. Once that comes, I'll lower FP back to 3bar & see if all is well. Also waiting for TT ECU to come back from Blighty. RAM error on 1st version.

[lookforjoe]

Captain Bondo, on 28 October 2009 - 02:36 AM, said:

10:1 should not be washing the walls down. If it's black smoke not blue/grey maybe it's just smoke from it being rich. Does it do it when the motor is cold?

140 across the board is on the low side, imo, especially with the exhaust cam advanced, but I guess it's even...
OS pistons should increase the compression ratio assuming they aren't dished more. That would actually increase comp test readings.

In guess it'll be easier to tell once you can tweak the tune yourself.

My only other thought right now is the turbo - but personally, I've never seen one smoke on decel - it's always been under boost. There is a fair amount of oil in the inlet/intercooler piping - so I'm wondering if the oil is being sucked back into the intake from the compressor housing...

I really don't understand why the compression would be relatively low like that. It doesn't smoke when cold, but I don't go into boost until the engine reaches normal operating temp.

[Jaxx]

lookforjoe, on 28 October 2009 - 03:29 AM, said:

I really don't understand why the compression would be relatively low like that. It doesn't smoke when cold, but I don't go into boost until the engine reaches normal operating temp.

was the motor warm? did you try a wet test as well to see if it made any difference?

[lookforjoe]

Jaxx, on 28 October 2009 - 04:33 AM, said:

was the motor warm? did you try a wet test as well to see if it made any difference?

Refer to Above Post

Tests should always be performed on a warm engine....

[EricF]

lookforjoe, on 28 October 2009 - 03:29 AM, said:

My only other thought right now is the turbo - but personally, I've never seen one smoke on decel - it's always been under boost. There is a fair amount of oil in the inlet/intercooler piping - so I'm wondering if the oil is being sucked back into the intake from the compressor housing...

I really don't understand why the compression would be relatively low like that. It doesn't smoke when cold, but I don't go into boost until the engine reaches normal operating temp.

If your compression is even, it could have to do with your gauge. I think compression tests are most useful for showing differences between cylinders.

Can you check to see if your turbo has any end-end shaft play? If the compressor wheel is pulling forward under boost, then rocking back when you lift off the throttle, there could be oil getting past the hard exhaust side shaft seal when it moves. Just a guess, really not too sure if it would work like that although I seem to recall similar symptoms on one of my setups.

Oil in the intercooler piping, I forget, do you have a catch can or not? It's most often just from the PCV... Also, if it was coming through the compressor housing, I think it would stick to the piping and intercooler core before ever reaching the engine itself.

Given all of the hard running your engine has seen, if you're still a bit shaken up about the compression readings, you may want to do a leakdown test to check the ring sealing that way. That is a much more repeatable and reliable way of testing in my opinion..

[lookforjoe]

EricF, on 28 October 2009 - 05:34 PM, said:

If your compression is even, it could have to do with your gauge. I think compression tests are most useful for showing differences between cylinders.

Can you check to see if your turbo has any end-end shaft play? If the compressor wheel is pulling forward under boost, then rocking back when you lift off the throttle, there could be oil getting past the hard exhaust side shaft seal when it moves. Just a guess, really not too sure if it would work like that although I seem to recall similar symptoms on one of my setups.

Oil in the intercooler piping, I forget, do you have a catch can or not? It's most often just from the PCV... Also, if it was coming through the compressor housing, I think it would stick to the piping and intercooler core before ever reaching the engine itself.

Given all of the hard running your engine has seen, if you're still a bit shaken up about the compression readings, you may want to do a leakdown test to check the ring sealing that way. That is a much more repeatable and reliable way of testing in my opinion..

Hi Eric

The turbo exhaust side seal/piston ring makes the most sense - becuase there is no evidence of oil fouling on the plugs, etc.. It's just the conditions don't match what I'm used to seeing on a leaky turbo...

I'll down a leak -down test again - I did one back in the summer, becuase I was concerned about the oil smoke after the DYno @ Carlisle video... no problems found & % was minimal, I can't find my notes on the exact % though.

[lookforjoe]

Good day today!

New OT-1 came, and the revised unit works! So now I can log timing & AFR's.

Woth ECU with revised tune arrived this evening, so I took it for a quick run, and just happened alongside a newer GTO willing to romp a little. If it wasn't for the clouds of oil smoke on decel it would have been perfect!

Also got my black pegs on...

[dublin14]

lookforjoe, on 30 October 2009 - 02:12 AM, said:

Good day today!

New OT-1 came, and the revised unit works! So now I can log timing & AFR's.

Woth ECU with revised tune arrived this evening, so I took it for a quick run, and just happened alongside a newer GTO willing to romp a little. If it wasn't for the clouds of oil smoke on decel it would have been perfect!

Also got my black pegs on...

Well did ya beat him? The Black pegs look great... makes the car look as bit more nasty!

[lookforjoe]

dublin14, on 30 October 2009 - 12:03 PM, said:

Well did ya beat him? The Black pegs look great... makes the car look as bit more nasty!

From his exhaust note, he wasn't stock, either - traffic was way to heavy to play around, so it was just a bunch of short pulls. I have no idea if I could pull on him in an open run.

[lookforjoe]

lookforjoe, on 30 October 2009 - 02:12 AM, said:

Good day today!

New OT-1 came, and the revised unit works! So now I can log timing & AFR's.

Woth ECU with revised tune arrived this evening, so I took it for a quick run, and just happened alongside a newer GTO willing to romp a little. If it wasn't for the clouds of oil smoke on decel it would have been perfect!

Also got my black pegs on...

Got a response from Hahn Racecraft on the Turbo... it seems the most probable cause is the drain tube angle - it's to close to horizontal where it comes off the CHRA - they reckon under higher boost the oil just isn't draining, and as a result will push past the exhaust side seal into the exhaust.


I'm going to redo the drain tube tomorrow, and hopefully that'll be the end of it. Relatively easy fix if that's all it is!

[HeavyIron]

Here's hoping for the best

[Captain Bondo]

Clouds of oil smoke? Sounds like it's getting worse... pulled the plugs?

[lookforjoe]

Captain Bondo, on 31 October 2009 - 05:07 PM, said:

Clouds of oil smoke? Sounds like it's getting worse... pulled the plugs?

yeah.

Plugs are clean - so I reckon it must be exhaust-side blow-by. Hahn reckons it's my drain tube -due to the lack of acute drain angle. There's just no room to drop the tube further than I now have it with the angle drive in the way. I redid the tube today (twice, 1st try wasn't much better), ended up using the flex egr tubing off a Pontiac grand am/ Silver Soldered the Volvo flange & a short section for the block oring.

Anyhow, the oil smoke is still there I just don't see it being the problem, since I've run high boost levels in the past without this issue, on the (now previous) drain tube.

After I put it together the 1st time, I took a friend for a test drive - and @ 23psi it started blowing oil out the filler cap along with the (now) usual out the back.

That's when I redid the tube with the egr flex pipe. Haven't run high boost (over 22) since, as it's been raining hard, so I don't know if I have crankcase overpressure issue still.

This is really frustrating, since I've gone over the breather system time & again (it's all new, anyway), and I just can't see where I can alleviate the pressure. I don't recall others with over 300WHp commenting on crank overpressure issues..

[lookforjoe]

Johann, on 20 October 2009 - 08:01 PM, said:

For OBD I use Palmer Performance PCMscan, Used a WinMobile Ease OBD also but PCMscan works for me.

About the ISO-9141, from what I recall the OT-1 tries to connect through CAN first. I belive the software allows to set it to 9141, need to check because it has been a long time since I last used the device.

Johann, can you extract more than one channel? It seems the ECU doesn't transmit at a high enough rate to extract more than one channel with Logworks without the data being really choppy - so all I have is timing & AFR's. Not sure if that will be meaningful enough to translate as a guide for TurboTuner.

[boosted850wagon]

new to modding a volvo and i was wondering with the newer oil pan on the older car what does that actually do and how much difference does it actually make?

[maciekb2002]

I see that we are both heaving fun. .
Easiest way to see if you turbo gives away is.
Check the bottom side of the flange on turbine side, right where downpipe connects to turbine housing, If you will see little black spot with nice crunchy oil. That is the sign that seal on turbocharger is begging to go.
I have seen oil on my oil cap area too sometimes. Somebody double gasket cap and it stopped leaking I didn't try that yet but it may actually works.
I was think about installing crankcase gauge to see how much pressure we getting down there.
My engine has 16k on it and I drove it on reg oil for first 3k to let rings seat correctly.
BTW go install Turbo tuner if you have it all ready .
Check jcviggen car with 25 psi , 440 whp , f..... ridiculous.

[lookforjoe]

boosted850wagon, on 01 November 2009 - 02:17 AM, said:

new to modding a volvo and i was wondering with the newer oil pan on the older car what does that actually do and how much difference does it actually make?

The oil pan makes no practical difference. I did it to update the oil filter to the cartridge style & to reduce the potential oil leak points.