[Tzu]

Did Ivo do this for you?

My bank 2 closely resembled bank 1, but was just about 3-5 points higher run to run prior to cleaning. After cleaning, banks deviated by 2ish points, but which bank would vary run to run, so I figured its general variance between pulls. Much more consistant.

Seems like I'm getting deviations again, but I borescoped the intake and the valves look decent. Time to pull off the manifold again and take a gander.

Update with meth logs. Look forward to your findings.

[zerep1]

Originally Posted by flexinator

I know the car is DI so the fuel doesn't directly hit the intake valves... But there is pass through gasses containing exhaust gasses and oil that comes back around through the valves. That is what causes the buildup of carbon. I wonder if e85 changes the composition of the pass through gases and in fact does reduce buildup or even clean the valves to some degree. Some people that spray meth also say it keeps their valves cleaner... Different idea but still...

Thoughts ?

You have less idle hesitation cause e85 is a better cleaner burning fuel higher octane and such

[ZixxSpeed]

My car kept misfiring on 2 cylinders, the previous owner was a lease owner, after like 5 trips to the dealership they decided to take it all apart and found out that my valves were so dirty with carbon build up, possibly due to the owner using crappy gas. Luckily I was covered under warranty and I didnt have to pay a dime for this to be cleaned.

[Sered]

You guys pulling the head before you get this done or you yanking off the intake and exhaust mani while engine is in the car?

[Ilma]

Originally Posted by Tzu

Did Ivo do this for you?

My bank 2 closely resembled bank 1, but was just about 3-5 points higher run to run prior to cleaning. After cleaning, banks deviated by 2ish points, but which bank would vary run to run, so I figured its general variance between pulls. Much more consistant.

Seems like I'm getting deviations again, but I borescoped the intake and the valves look decent. Time to pull off the manifold again and take a gander.

Update with meth logs. Look forward to your findings.

Yup...Ivo is the man

Can't recommend him enough.

Like you say - before the cleaning job bank 2 was ALWAYS the higher one.

Now on my datalogs I notice the two banks take turns as to which is higher and only by 2-3%.

So like you say it's probably normal deviation.

Got my trunk liners out of the car to prepare for the trunk mounted tank I ordered from Howerton.

As soon as I get some logs with meth I will post them up.

Seeing as my warranty is about to run out I am also about to pull the trigger on some downpipes too. I know they increase spoolup, but have seen contradictions on how much power they add.

10-30 hp

I would be getting them primarily to get more heat out of the combustion chamber though.

[Ilma]

Originally Posted by Sered

You guys pulling the head before you get this done or you yanking off the intake and exhaust mani while engine is in the car?

You just remove the intake manifold to gain access to the intake valves. Exhaust valves are not affected by the carbon buildup.

[Tzu]

Ivo is awesome! I have a grit blaster though, so I tend to do preventitive maintenance more often.

IMO, with meth you should be using downpipes. Your pump log looks like 16psi tapering to 14? Thats a serious amount of backpressure building on the low pressure side of the turbine and it's only fighting you. Spool is much faster, and its ideal with the OEM exhaust. Perfect sound IMO. I can help you install if you choose to DIY it.

[Ilma]

Originally Posted by Tzu

Ivo is awesome! I have a grit blaster though, so I tend to do preventitive maintenance more often.

IMO, with meth you should be using downpipes. Your pump log looks like 16psi tapering to 14? Thats a serious amount of backpressure building on the low pressure side of the turbine and it's only fighting you. Spool is much faster, and its ideal with the OEM exhaust. Perfect sound IMO. I can help you install if you choose to DIY it.

It's closer to 15 psi. The taper would be a couple of psi lower at redline, but I shifted at 6K rpms.

Did you find much of a power gain when you installed yours....or more of a spoolup impact.

Maybe I am wrong, but I always figured that the size of the turbine wheel would be the limiting factor in creating initial backpressure. If you think about it even with catless downpipes the exhaust still has to flow through that small hole and spin the turbine wheel.

I imagine that decreasing back pressure on the other side of the turbine wheel would help things along though

Check your PM.

[Tzu]

Ilma, clear your inbox dude.

[Sered]

Originally Posted by Ilma

Exhaust valves are not affected by the carbon buildup.

Why? Temperatures?

[Joshboody]

DPs are only a plus... do it. turbine works on a differential, so reducing this post-turbine gives you more potential and increases VE.

Lot of choices on DPs, but I would stick with used ARs... never really seen any complaints, but some of the other choices you'll see occasional issues like fitment or subframe clearance. I think the latest ARs have a revision in exhaust flange so the bolts fit better. I have the older ones and had to use a smaller bolt for 1 hole... not a big deal though.

[Jeff@TopGearSolutions]

Originally Posted by NjRep335i

I know my valve's need this cleaning too. I filled up with a 50/50, 93/E85 and the idle surge stopped. I don't know if this was coincidental or not. I'm still planning on going through with the cleaning in three weeks. 82,000 miles.

The fuel does not matter on this car as far as cleanliness of intake valves, as no fuel passes over the valves like port injection cars do.

This car is Direct injection so the fuel injectors spray into the combustion chamber.

However, the E85 may have cleaned up the fuel injectors themselves.

[Ilma]

Originally Posted by Tzu

Ilma, clear your inbox dude.

Done

[Ilma]

Originally Posted by Sered

Why? Temperatures?

In a sense.....some of the crankcase oil vapours accumulate on the intake valves and don't make it into the combustion chamber. That is what creates the carbon buildup.

The oil vapours that make it past the intake valves get burned off during the combustion cycle so the exhaust valves don't have the same issue.

[tmurphy2]

Maybe a stupid question, how the hell do you find someone who does walnut blasting, seems like a pretty uncommon thing.

[djjasper]

Originally Posted by tmurphy2

Maybe a stupid question, how the hell do you find someone who does walnut blasting, seems like a pretty uncommon thing.

You are in the right place- this board is probably your best bet. Try your regional forum too here on e90post. If no Indy shop around you has the equipment yet I bet someone will soon. This is a maintenance service that everyone with a DI motor is going to need around 30-40k miles. I guess here around Philly we are fortunate to have a few shops doing it. I had mine done a couple weeks ago at Helix in Philly. Probably won't help you in CT but I'm sure you'll find a shop.

[BlueBimmer]

Originally Posted by djjasper

You are in the right place- this board is probably your best bet. Try your regional forum too here on e90post. If no Indy shop around you has the equipment yet I bet someone will soon. This is a maintenance service that everyone with a DI motor is going to need around 30-40k miles. I guess here around Philly we are fortunate to have a few shops doing it. I had mine done a couple weeks ago at Helix in Philly. Probably won't help you in CT but I'm sure you'll find a shop.

WOW - just what I was looking for! Did you feel any difference? Do you have a lot of buildup? Price? Pics??


Thanks a lot!!

[djjasper]

Here are the pics and check out my thread and review of getting this done down at Helix in Manayunk:

http://www.e90post.com/forums/showth...8#post12138648

[Rong335i]

In your after show of the intake valve... there appear to still have some walnut leavings. Did you eventually suck those off with the vacuum cleaner prior to putting things back together?

Will walnut leavings damage the engine if is not thoroughly removed?

[djjasper]

Any dust or crumbs like that will burn right off. No worries.

[BlueBimmer]

Originally Posted by djjasper

Here are the pics and check out my thread and review of getting this done down at Helix in Manayunk:

http://www.e90post.com/forums/showth...8#post12138648

Thanks man, hopefully Eric can put together a group buy for this sometime soon.

[chazzz]

FYI - Harbor Freight sells a bag of fine grade walnut shell for blasting. 25 pounds for $22.99.

See the link: http://www.harborfreight.com/25-lbs-...dia-92155.html

Anyone in here tried DIY in walnut blasting inside of the ports?