Originally Posted by mahcah

I let it sit for about 15 minutes. A lot of smoke came out. I have a long video. Lol

Originally Posted by mahcah

Do it like this

Originally Posted by DroCityLex

did you spray into the throttle body while the car was running? i watched a seafoam video on youtube and thats what they did

Originally Posted by semnosNSX

thanks mahcah!!!!

Originally Posted by lobuxracer

Why not just use water? I do that all the time before a teardown to minimize the carbon clean up. It generates the same clouds of "smoke" seafoam does and it isn't a hydrocarbon that will dilute your oil.

The key to any of these methods is to get the engine really hot. It's the sudden temperature differential that makes the carbon come off.

The other thing you'll likely find with KCLV challenged engines is the deck height isn't optimized so the squish is too great. Squish height is the most critical dimension in a performance engine because it alone determines octane requirements. Get the squish right, and the engine will run ridiculously high compression on crappy fuel. Get it wrong and you'll be scratching your head for years trying to understand why the engine won't run on anything less than the most expensive high octane fuels. Manufacturing tolerance for squish almost invariably puts it in the less than ideal range, and sometimes in the far from good range.

Originally Posted by RRRacing

Water is certainly another good option.

Regarding KCLV challenged engines, I think the 2UR-GSE's are actually extremely consistent. In fact one of our challenges since we began tuning a year ago is that ALL the local cars we tune behave exactly as we expect and ramp KCLV very consistently, so it was only in th course of evaluating datalogs of dozens of ISF's all over the country that we started seeing some variability.

In any case, the extent to which the decarb procedure helped actually really took me by surprise. Previously, I felt that fuel quality/formulation and engine tolerance was the source for some of the variability we saw.

So if anyone is considering doing this, make a note of your KCLV before doing the decarb... reset the ECU after the decarb, and see if it advances to a higher value after running a full tank.

Rafi

Originally Posted by lobuxracer

The other thing to try is run a different brand of gasoline. The only difference between brands is the additive packages (the base fuel is the same in any given market for ALL brands), and I learned from a petrochemical engineer that many of the additive packages are antagonistic, meaning what builds up from one brand gets stripped off by another brand. So I routinely use different brands of gas in my car just to minimize carbon build up. I know it works, I've seen the results. Brand loyalty with gasoline isn't a good thing.

Originally Posted by dcguy

Some clarification on the application would be helpful. I've only used intake cleaner with the car running. This is drawn some interest to me due to having a KCLV challenged car. Spray an entire can into the intake manifold just past the butteryfly making sweeps to drench the entire inside? Or just point and shoot? Does the sea foam expand like great stuff or more runny like wd-40? Let sit for 15 mins. Apologies I have never used this product, I would love to monitor this and report my findings to this thread

Originally Posted by semnosNSX

thanks mahcah!!!!