Before and after walnut intake valve cleaning on N18 with 89000 miles
#3
#4
#5
No not really. At low rpm I would be very surprised if it would improve performance. I think that maybe there would be minor difference at high rpm but I cant feal it. I had it done because im pretty sure the previous owner of the car never did and I worry about extra wear on the valves over time. When I think about it its kind of like a slightly more restrictive intake when it is dirty so would expect to only see a different at high rpm. If the engine tuning is stupid enough then I suppose it could effect starting, kind of like having a choke on too tight but I dont notice any start up difference. Then again it was 85-90 here today so I probably wouldent. I plan to hold onto the car for a while so im hopeing that this prevents valve wear. Time will tell.
EDIT: then again this is a turbo so the turbo probably will still build boost the same way and overcome any resistance by just dumping a little bit later. It would certainly explain not feeling much of a difference. Im still happy I had it done and also happy I had the car looked over by people who actually know what they are doing.
EDIT: then again this is a turbo so the turbo probably will still build boost the same way and overcome any resistance by just dumping a little bit later. It would certainly explain not feeling much of a difference. Im still happy I had it done and also happy I had the car looked over by people who actually know what they are doing.
Last edited by Wanderlustsrt; 04-28-2017 at 03:39 PM.
#6
#7
Yeah your probably right. At first I thought it looked terrible but even the guy at helix where I had it done said it was not the worst he had seen. Maybe its just less important on an N18 than an N14. Still I would rather not have the junk in there. The car has really really grown on me to the point I may get it repainted. I think I will keep it for a while.
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#8
I also had this done at Helix in Philly. I had about 70k on when it was done and no real improvement in performance. Probably more placebo than anything else but it was good to have done regardless. I plan to tune so I imagine that it cant not help. Regardless it should be part of regular maintenance for these vehicles and will improve overall performance and reliability.
#9
No not really. At low rpm I would be very surprised if it would improve performance. I think that maybe there would be minor difference at high rpm but I cant feal it. I had it done because im pretty sure the previous owner of the car never did and I worry about extra wear on the valves over time. When I think about it its kind of like a slightly more restrictive intake when it is dirty so would expect to only see a different at high rpm. If the engine tuning is stupid enough then I suppose it could effect starting, kind of like having a choke on too tight but I dont notice any start up difference. Then again it was 85-90 here today so I probably wouldent. I plan to hold onto the car for a while so im hopeing that this prevents valve wear. Time will tell.
EDIT: then again this is a turbo so the turbo probably will still build boost the same way and overcome any resistance by just dumping a little bit later. It would certainly explain not feeling much of a difference. Im still happy I had it done and also happy I had the car looked over by people who actually know what they are doing.
EDIT: then again this is a turbo so the turbo probably will still build boost the same way and overcome any resistance by just dumping a little bit later. It would certainly explain not feeling much of a difference. Im still happy I had it done and also happy I had the car looked over by people who actually know what they are doing.
PS thx for posting!
Before
After
#11
I wonder if its really an issue of build up from excess EGR valve re circulation and the direct injectors due to inside the cylinder location cant spritz the fuel on it to clean it off.
#12
That's exactly the reason. Cars with direct injection and aftermarket meth injection aren't prone to this issue.
#13
Thats a fairly bad design flaw to direct injection. It would also seem stopping egr would be a solution or maybe just filtering it somehow? But I would imagine that would mess with the engine computer if stopped completely. They should have one extra fuel injector like the port or manifold injectors on the older engines, all they would need is one extra to occasionally spritz and it would solve this. I suppose aftermarket meth like you said works but perhaps a bigger turbo and extra external injectors to fuel it would also work. Anyway im sure by now someone has though of this at a car maker level and is fixing it. Maybe the new engines comming out wont have this issue.
#14
Thats a fairly bad design flaw to direct injection. It would also seem stopping egr would be a solution or maybe just filtering it somehow? But I would imagine that would mess with the engine computer if stopped completely. They should have one extra fuel injector like the port or manifold injectors on the older engines, all they would need is one extra to occasionally spritz and it would solve this. I suppose aftermarket meth like you said works but perhaps a bigger turbo and extra external injectors to fuel it would also work. Anyway im sure by now someone has though of this at a car maker level and is fixing it. Maybe the new engines comming out wont have this issue.
I have e92 with big turbo setup (Garrett GTW3684), and meth kit saves my intake valves. Even when I am not racing, I let DME spritz a bit of meth just to maintain stuff clean.
There's no fix to this obviously, unless DI is changed back to ported design.
#15
So the whole topic was so interesting I did some searching this AM. It turns out ford and VW both have engines that are both port and direct injection although apparently the VW ones are kept to europe and are more of an emissions thing. Ford seems to be gradually fazing it into all there new engines (next V8 coyote, 3.5 and 2.7):
http://www.thetruthaboutcars.com/201...report-claims/
see second gen ecoboost section:
https://media.ford.com/content/fordm...ter-boost.html
http://fordauthority.com/2016/12/sources-say-ford-f-150s-4-8l-v8-to-feature-dual-injection-replace-5-0l-coyote/
Im hoping BMW will decide to do the same at some point. Im sure GM will do the same thing to compete with ford, not that this helps mini owners.
http://www.thetruthaboutcars.com/201...report-claims/
see second gen ecoboost section:
https://media.ford.com/content/fordm...ter-boost.html
http://fordauthority.com/2016/12/sources-say-ford-f-150s-4-8l-v8-to-feature-dual-injection-replace-5-0l-coyote/
Im hoping BMW will decide to do the same at some point. Im sure GM will do the same thing to compete with ford, not that this helps mini owners.
#16
So the whole topic was so interesting I did some searching this AM. It turns out ford and VW both have engines that are both port and direct injection although apparently the VW ones are kept to europe and are more of an emissions thing. Ford seems to be gradually fazing it into all there new engines (next V8 coyote, 3.5 and 2.7):
http://www.thetruthaboutcars.com/201...report-claims/
see second gen ecoboost section:
https://media.ford.com/content/fordm...ter-boost.html
http://fordauthority.com/2016/12/sources-say-ford-f-150s-4-8l-v8-to-feature-dual-injection-replace-5-0l-coyote/
Im hoping BMW will decide to do the same at some point. Im sure GM will do the same thing to compete with ford, not that this helps mini owners.
http://www.thetruthaboutcars.com/201...report-claims/
see second gen ecoboost section:
https://media.ford.com/content/fordm...ter-boost.html
http://fordauthority.com/2016/12/sources-say-ford-f-150s-4-8l-v8-to-feature-dual-injection-replace-5-0l-coyote/
Im hoping BMW will decide to do the same at some point. Im sure GM will do the same thing to compete with ford, not that this helps mini owners.
With my tune, the *scary* thing is to have AFR go super lean if meth stops for any reason during WOT above 25 PSI... Melted pistons will be the least damage
I suppose modern engineering is able to solve the issue, but it makes our engines even more complicated. Electric wheels seems to be the only solution ))