Overboosting due to host 10 mod

[nickmcgill]

Hello my fellow TT owners.

I'm curious to get some input on this one mainly from Marky and Ross regarding an over boost issue I've got as a result of the host 10 mod.

For awhile now I've had issues running the twins because 8/10 times the boost will go up to 19/20psi and then the ECU will hit boost cut, everything is downhill from that point on

After replacing and checking all the hoses and the primary boost controller I've reverted back to the standard set-up from the hose 10 mod.

I've done a few runs to confirm this fixes the issue which it seems to, nothing over 16psi on 4 consecutive runs.

The downsides of going back to stock far out way the gains of the mod unfortunately.

When reverting back I lost 4psi on the primary, lost all low down torque and acceleration, twin change over went from 4k rpm to 5,5-6k and just generally sluggish to drive.

The car doesn't feel like its running any boost at all until its over 5psi~

It would seem that the extra 4 or so PSI on the primary is what's causing the issue with the over boosting.

I'm trying to think of a way to keep this around 10~ psi and still maintain the mod.

As many of you will know the two T sections near the intake of the primary has one which vents onto the intake.

I was contemplating removing this and putting a bend in so the BOV is still connected to hose 10, but also will be giving a reading to the controller in both the bbod and the battery side.

Dave also suggested running waste gate pressure which might also be worth looking into.

He also offered to pay for my single conversion as he is such an advocate of telling people to do it, cheers Dave!

Interested to know peoples thoughts.

[STiNGR]

No issues with the BH I've done the mod on. Runs sweet. I don't have a boost guage in that one so I'm unsure of the boost pressure either turbo is running, going to rob the boost guage from the other BH and chuck it in my daily so I know. Sure you just don't have a leak somewhere causing the cut? Do you have factory bov or aftermarket?

P.S. Whoever this "dave" is, feel free to single mine too!

Edited December 24, 2014 by STiNGR

[nickmcgill]

I'm pretty sure I don't have any leaks, I've replaced most of the hoses and they all have cable ties or clamps on the ends of them.

[DacerX]

I'm funding all single turbo conversion this Christmas but u needed to have your paperwork in my Christmas Eve so Santa was getting his jdm elves on the job. Also I never said run wastegate pressure I said to use a ebc or boost tap off the wastegate actuator that's on the primary as that's the main on that controls everything with tt

[STiNGR]

Bugger

[nickmcgill]

Got it fixed, will do a write up on it after new years.

[Marky]

I was gonna say why not just run a boost tap instead, problem solved