Exhaust Pressure Results 4.8L/76mm

[Foose04]

She's in. Robert had some work to do to make it happen, but did awesome. We're lucky to have someone like that in the local area. Truck is a different beast all together though. It sounds different going from a 3" exhaust with an open cutout, now it's sealed to the rear 4" setup. Makes it sound a lot deep and pretty quiet actually.

As far as power, it's a damn Freight Train once you get the fire cookin. It's going to take more RPMS to wake it up, as expected, but she's moving so damn air thats for sure. That compressor is actually really quiet to, so that with the quiet exhaust, all you really get is a deep note and pinned to the seats effect lol.

Next up is a wastegate change though, the 40mm doesn't have a change keep boost down. It opens at 12-13psi and by 5500rpms she ripping past 20 on the way to the moon. I'm thinking about just doing a 60mm gate so I won't have any issues and less rise during shifts as well.

I get back in town this weekend, but head back out on Tuesday for another week.

[TurboWS6]

Originally Posted by Foose04

Next up is a wastegate change though, the 40mm doesn't have a change keep boost down. It opens at 12-13psi and by 5500rpms she ripping past 20 on the way to the moon. I'm thinking about just doing a 60mm gate so I won't have any issues and less rise during shifts as well.

Try dumping that gate to atmosphere until you get the bigger one. If there is any pressure at all in the downpipe it will have effect it. Worth a try since your going to have to replace the gate pipes anyway if you run a larger gate. Just make sure its not shooting exhaust gas at something flammable. Make sure you check over the boost source to controller to gate sensing line for any leaks.

Like I said at the track the little 38mm is holding the S482 on my car down to 7 psi just fine and I dont have any exhaust leaks pre-turbo. So that 40 should do the trick.

[BAD BOB]

Originally Posted by TurboWS6

Try dumping that gate to atmosphere until you get the bigger one. If there is any pressure at all in the downpipe it will have effect it. Worth a try since your going to have to replace the gate pipes anyway if you run a larger gate. Just make sure its not shooting exhaust gas at something flammable. Make sure you check over the boost source to controller to gate sensing line for any leaks.

Like I said at the track the little 38mm is holding the S482 on my car down to 7 psi just fine and I dont have any exhaust leaks pre-turbo. So that 40 should do the trick.

I feel that with the waste gate pipe going into the downpipe at such an angle that it creates a vacuum effect and helps the waste gate work a little better.

One difference with his waste gate than most is that the gate. Only pulls off one bank of the exhaust which somewhat limits the amount that it can do. I'm sure one way or another he will get it squared away

[TurboWS6]

Originally Posted by BAD BOB

I feel that with the waste gate pipe going into the downpipe at such an angle that it creates a vacuum effect and helps the waste gate work a little better.

One difference with his waste gate than most is that the gate. Only pulls off one bank of the exhaust which somewhat limits the amount that it can do. I'm sure one way or another he will get it squared away

Didn't realize it was only coming off of one bank. You got a point on the scavenging effect didn't really think of that.