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[niterydr]

Then again maybe I am wrong, I only tune cars for a living and have set the boost on a 500+ of them by now... He was having a boost control issue, aka his wastegate wasn't flowing, aka he needed to address it with the ability to flow more air. If you give the compressor wheel a running start (aka more boost down low/allowing the wastegate to remain closed longer) why WOULDN'T it go higher? Again, Justin, I understand what you are saying, but his car was going higher on its own will, its a pretty common problem actually, something I get to deal with on 1/2 the dsms I work with. Unless we have a proper wastegate on it (or a good boost leak) the car will build 20+psi by redline easily, yes it will hold, but that overall boost spike will continue to rise until you run out of efficiency.
I really doubt we would tell a customer to keep the boost down for shits and giggles...

[JET]

Originally Posted by niterydr

Then again maybe I am wrong

From my experience, yes, you are wrong.

Originally Posted by niterydr

I only tune cars for a living and have set the boost on a 500+ of them by now... He was having a boost control issue, aka his wastegate wasn't flowing, aka he needed to address it with the ability to flow more air. If you give the compressor wheel a running start (aka more boost down low/allowing the wastegate to remain closed longer) why WOULDN'T it go higher? Again, Justin, I understand what you are saying, but his car was going higher on its own will, its a pretty common problem actually, something I get to deal with on 1/2 the dsms I work with.

You need to think about this a bit longer, Swanny. Having the boost set higher does not make the boost creep worse. The problem is an inability for the wastegate to flow enough out of it and the exhaust is flowing too much. This almost always comes from an upgrade of the exhaust, but no upgrade for the WG path. This causes an imbalance that the stock car doesn't have. This is easily fixed by porting of the turbo, and if it is severe enough, porting of the O2 housing, or an O2 housing upgrade.

Originally Posted by niterydr

Unless we have a proper wastegate on it (or a good boost leak) the car will build 20+psi by redline easily, yes it will hold, but that overall boost spike will continue to rise until you run out of efficiency.
I really doubt we would tell a customer to keep the boost down for shits and giggles...

The problem he is having is NOT a boost spike. He has boost creep, 2 totally different issues. Boost spike is shown on John's graphs, that is the spike when the boost first hits. A boost spike will get worse as the boost is turned up. Boost creep is the ramping up of boost also shown on John's graphs. I have fixed many cars with boost creep issues just by porting, many people on here have used them and they work fine. Porting will fix his problem, period.

[niterydr]

Originally Posted by JET

From my experience, yes, you are wrong.



You need to think about this a bit longer, Swanny. Having the boost set higher does not make the boost creep worse. The problem is an inability for the wastegate to flow enough out of it and the exhaust is flowing too much. This almost always comes from an upgrade of the exhaust, but no upgrade for the WG path. This causes an imbalance that the stock car doesn't have. This is easily fixed by porting of the turbo, and if it is severe enough, porting of the O2 housing, or an O2 housing upgrade.



The problem he is having is NOT a boost spike. He has boost creep, 2 totally different issues. Boost spike is shown on John's graphs, that is the spike when the boost first hits. A boost spike will get worse as the boost is turned up. Boost creep is the ramping up of boost also shown on John's graphs. I have fixed many cars with boost creep issues just by porting, many people on here have used them and they work fine. Porting will fix his problem, period.

My thoughts exactly he has to work the wastegate housing by increaseing the size of the bypass OR a higher tension spring.

BUT is is a flow related restriction, so if we turn the boost up down low, it will continue to creep as the wastegate isn't displacing enough air. I have seen this in HUNDREDS of cars. You can starve off a creep by tuning ignition timing, having the boost come on lazy, or decreasing wastegate force up top (ebc applications only). On this setup, he should just port the turbine housing/upgrade the 02 and call it done.

That is my point is he can't just set it to 15 and expect it to stop at 19, it doesn't work like that.