I-S
31-07-2007, 01:17 PM
I bought some of this stuff to give it a try. It's a similar type of product to Amsoil's power foam, in that you spray it in to the engine through the air intake (AFTER the MAF!). It is rather more expensive. This stuff is a clear spray, rather than a foam.
The main reason I wanted it is because the GDI engines are known for coking up on the intake valves - they have very high levels of EGR, so plenty of carbon comes in this way and because of the direct injection, there's no fuel vapour to take it off (and means that v-power or redex type things can't help with it either). The only ways to deal with it are either to have the engine decoked with walnut shells (eh?) or to introduce something into the inlet manifold to soften/break up the carbon.
With the GDI, putting this stuff into the engine is very much a two person job because there is no throttle cable. One person must sit in the car and work the pedal while the other takes of the intake pipe and sprays into the manifold.
So, as part of last weekend's great works, Kieran and I tackled this as first order of business. No real problems with doing any of it - there weren't the great clouds of smoke as the amsoil power foam generated from the GLS. In fact, it was difficult to tell if it was doing much at all, other than trying to make the engine stall and knock.
After a little drive to clear the car's throat a little (as recommended), I got to work with changing the oil. It was BLACK. Some of that will have come from the 1500 miles it's been in there, some of it will have come from it doing what it's intended to do with the short intervals at the moment (ie to carry out the coked-up gunk from the engine). Perhaps some of it was dislodged by the 10k boost... who knows.
Regardless, given a couple of days driving, the engine has definitely perked up somewhat. How much is down to the benefits of oil changing, and how much to the 10k boost is hard to say, but I've never had this level of improvement from an oil change before. One very noticeable change is that even from a cold start, the engine starts immediately now - not even a single complete turn on the starter. The GDI engine revs itself to 2000rpm for a few seconds and then drops almost immediately below 1000 (much sooner than the GLS engine), but that process of dropping down now occurs even faster than it did.
The GDI has significant mid-range (2000-4000) urge, and that's improved a little also. The other noticeable change is that higher revs are a bit smoother than they were (still not as smooth as the GLS) - perhaps this is from the oil change rather than the boost (although it didn't change like this on the previous oil change).
All in all, it does seem to have helped. I'd be interested to see how anyone else gets on with it.
The main reason I wanted it is because the GDI engines are known for coking up on the intake valves - they have very high levels of EGR, so plenty of carbon comes in this way and because of the direct injection, there's no fuel vapour to take it off (and means that v-power or redex type things can't help with it either). The only ways to deal with it are either to have the engine decoked with walnut shells (eh?) or to introduce something into the inlet manifold to soften/break up the carbon.
With the GDI, putting this stuff into the engine is very much a two person job because there is no throttle cable. One person must sit in the car and work the pedal while the other takes of the intake pipe and sprays into the manifold.
So, as part of last weekend's great works, Kieran and I tackled this as first order of business. No real problems with doing any of it - there weren't the great clouds of smoke as the amsoil power foam generated from the GLS. In fact, it was difficult to tell if it was doing much at all, other than trying to make the engine stall and knock.
After a little drive to clear the car's throat a little (as recommended), I got to work with changing the oil. It was BLACK. Some of that will have come from the 1500 miles it's been in there, some of it will have come from it doing what it's intended to do with the short intervals at the moment (ie to carry out the coked-up gunk from the engine). Perhaps some of it was dislodged by the 10k boost... who knows.
Regardless, given a couple of days driving, the engine has definitely perked up somewhat. How much is down to the benefits of oil changing, and how much to the 10k boost is hard to say, but I've never had this level of improvement from an oil change before. One very noticeable change is that even from a cold start, the engine starts immediately now - not even a single complete turn on the starter. The GDI engine revs itself to 2000rpm for a few seconds and then drops almost immediately below 1000 (much sooner than the GLS engine), but that process of dropping down now occurs even faster than it did.
The GDI has significant mid-range (2000-4000) urge, and that's improved a little also. The other noticeable change is that higher revs are a bit smoother than they were (still not as smooth as the GLS) - perhaps this is from the oil change rather than the boost (although it didn't change like this on the previous oil change).
All in all, it does seem to have helped. I'd be interested to see how anyone else gets on with it.