help with super 16g

[qbanit0gsx]

i just installed my hrc super 16g and i got nasty lag . the boost kicks in at about 4k. i know i need some supporting mods but should i really have that much lag

 

[90AWDTalon]

I don't have any personal experience with that turbo, but from what I've heard on this site the super turbo's from Hahn are very laggy.

 

[ShapeGSX]

Your "Super" 16G has a 10cm housing. You have to expect lag with a mismatched setup like that.

 

[qbanit0gsx]

Your "Super" 16G has a 10cm housing. You have to expect lag with a mismatched setup like that.

I was told that this would be a great set up so what should i do should i boost it more. i currently am running it with out a boost controller. any other ideas

 

[ShapeGSX]

I've been telling people otherwise for years, now. You just listened to the wrong guy.

Anyway, you can also check for exhaust leaks. Check the wastegate to see if it is cracked or not seating correctly.

Really bad lag is usually caused by exhaust leaks that come before the turbine. Or 10cm exhaust housings.

A boost controller will also lessen lag.

 

[Bd1000Eclipse]

A boost controller will also lessen lag.

umm.. no :thumbdown

 

[Turbo 2g awd]

Check for boost leaks before the turbo, that will cause lag. But I am running the Super 16g and dont get full boost till about 3900rpms. I am runnign 21psi.

 

[ShapeGSX]

umm.. no :thumbdown

Umm yes. A boost controller will delay the opening of the wastegate by keeping the boost from reaching the wastegate until a bit before the set boost is reached. That can lessen turbo lag. Basic stuff.

 

[Bd1000Eclipse]

umm no... A boost controller WILL not lessen lag. A boost controller holds back boost controller from the wastegate so it gets higher boost. How is this going to reduce lag? Lag is changed by exhaust, turbo size, etc. Not boost controllers. Think before you post a stupid answer twice.

 

[ShapeGSX]

Listen, I'm programming my own electronic boost controller. I know a little bit about this. I already told you how a boost controller can affect lag.

If you connect the wastegate directly to the intake manifold, the wastegate will start to open up WELL BEFORE the wastegate boost pressure is reached. It isn't like the wastegate just pops open 100% when it reaches the boost pressure defined by the diaphragm and the spring pressure. The wastegate slowly opens as boost builds. Therefore, as the turbo spools up, some of the exhaust will escape through the cracked-open wastegate port. The boost curve will hit the set boost more slowly because of this.

A boost controller like a Hallman or one of the solenoid boost controllers will keep the wastegate closed longer. For example, a 10psi actuator might crack open at 6psi. But when you install a boost controller set at 10psi, it might delay the opening til 9psi by keeping any boost from reaching the wastegate until it hits 9psi.

Now, in control systems you have to watch out for this point at which you start to control the system. If you do it too late, you could cause a spike. If you do it too soon, it takes too long to reach the set level.

This is really just basic linear control systems course material. Have YOU taken a linear control systems course? Just because you can't think of a way something will affect something else doesn't mean that it doesn't happen. It just means you haven't thought of it yet.

 

[KFT0001]

Don't be so hostile Bd1000Eclipse, there's no need to jump down somebody's back and act like an ass. Besides, he's correct - a boost controller does reduce lag.

 

[Bd1000Eclipse]

Don't be so hostile Bd1000Eclipse, there's no need to jump down somebody's back and act like an ass. Besides, he's correct - a boost controller does reduce lag.

explain to me how...

 

[Bd1000Eclipse]

Listen, I'm programming my own electronic boost controller. I know a little bit about this. I already told you how a boost controller can affect lag.

If you connect the wastegate directly to the intake manifold, the wastegate will start to open up WELL BEFORE the wastegate boost pressure is reached. It isn't like the wastegate just pops open 100% when it reaches the boost pressure defined by the diaphragm and the spring pressure. The wastegate slowly opens as boost builds. Therefore, as the turbo spools up, some of the exhaust will escape through the cracked-open wastegate port. The boost curve will hit the set boost more slowly because of this.

A boost controller like a Hallman or one of the solenoid boost controllers will keep the wastegate closed longer. For example, a 10psi actuator might crack open at 6psi. But when you install a boost controller set at 10psi, it might delay the opening til 9psi by keeping any boost from reaching the wastegate until it hits 9psi.

Now, in control systems you have to watch out for this point at which you start to control the system. If you do it too late, you could cause a spike. If you do it too soon, it takes too long to reach the set level.

This is really just basic linear control systems course material. Have YOU taken a linear control systems course? Just because you can't think of a way something will affect something else doesn't mean that it doesn't happen. It just means you haven't thought of it yet.

so you're saying if i put on a different boost controller my turbo could/will spool lets say a few 100rpm's quicker? it makes no sense still.

 

[ShapeGSX]

so you're saying if i put on a different boost controller my turbo could/will spool lets say a few 100rpm's quicker? it makes no sense still.

Yes, that is exactly what I am saying. It all depends on when the controller lets the wastegate actuator see boost.

 

[blu_gxl]

Every add I've ever seen for boost controllers says that it will reduce lag time.

 

[KFT0001]

explain to me how...

As ShapeGSX explained, the wastegate doesn't suddenly open 100% when it hits the boost you want it at. It opens gradually starting at whatever it's cracking pressure is. If the wastegate is open before your max boost, exhaust gasses are bypassing the turbine and going through the wastegate instead - gasses that would otherwise be spooling the turbine. What boost controllers do are they delay any boost signal to the wastegate until it gets close to whatever boost level you wanted, therefore the wastegate cracks open at a later boost pressure and no exhaust gasses were wasted due to the wastegate cracking open at a lower pressure.