With the weather being so nice this past weekend, we decided to head out for one last track day of the year. We have made a couple of changes to the car since MIR, where we had rear diff issues along with a fueling issue, which made us keep the boost way down (35-38 psi).

The fueling issue ended up being a bad regulator, that wasn't increasing fuel pressure correctly with boost. With the fueling issue solved, I looked into the rear diff issue. It turns out the rear subframe was flexing a lot!! I ripped/cracked the rear subframe in 3 spots which was allowing movement of the rear end. One of the rips is a good 4-5 inches long. At MIR, I meet a new friend that happened to have a Magnus chromoly rear subframe that he was selling at a great price. That seemed to have taken care of the diff issues.


Heres our results from the weekend:

 

You have achieved alot this year and deserve every bit of it, its been one hell of a season! The demon just keeps getting faster and sexier I can't wait to see what next year brings!

 

That is nuts. Congrats man.

 

That is madness! Still on the GT3794R HTA? If so, quite an impressive turbo for its size to be part of the puzzle to get you into the low 8s/170+mph :O

 

I believe it is a t3 PTE 6766.

 

They were running the HTA previously, I would be very surprised if they went from that to a 6766....

 

Insane. My favorite Dsm great job!

 

what tire pressure are u running??? front and rear???

 

172.7mph is pretty ridiculous, congrats guys!

 

Amazing! Congrats Devin and Boostin Crew!

 

Devin if you done mind saying, what regulator was it? Im currently having the same issues and am thinking its a bad regulator as well.

 

Thanks everyone!!

I've used both turbo's this year - the 3794 and the 67/66. We are going to test both turbo's on the dyno soon, and I will be posting my results.

I run between 10-14 psi, depending on track conditions.

It was 5+ years old, and was the same regulator I ran when I was DD the car. The diaphram was ripped, and was not the regulators fault.

Devin

 

That thing is hauling!

 

Crazy the car keeps getting higher and higher love it!

 

Thanks!! The goal for next year is to trap 175+ mph first time out

Devin