Lindsey Dual Port Wastegate - New Chapter

[whalenlg]

Now that my engine is out, I get to examine other odd behavior that I couldn't explain before.

I did 2 tests of the Lindsey DP Wastegate

(1) Base line - no boost controller. Top port connected to my Pressure Bleeder, side port open
This should mimic the way I had it set up before the engine was pulled - cycling valve connected to top port, side port open.
Tested both ports individually - both held 15 psi (top port held it better)
Visual Testing of internal wastegate valve:
Up to 10 psi on the top port - no movement of internal valve
By 15 psi - valve fully open.

This does track with my cycling valve setup where I connect the cycling valve to the top port and leave the side one open I max boost at 15-16 psi, which is where I want the max to be.

(2) Dual Port connection with Manual Boost Controller
Connect the MBC to side port and get same behavior when I open the MBC fully - valve moves between 10-15 psi

Turning the MBC, it does move the valve up and down when the top port is at 15 psi, but the sensitivity is very high = half a turn between doing nothing and blocking the valve from opening even up to 20 psi.

Does it seem like the Wastegate spring is too strong?

I would expect to start to see the valve fully open by 10psi and then use my MBC to set the max to 15 with much less sensitivity.

[Darwin]

To me that sounds like the spring was too weak. I have a LR DP WG also and when I asked them about spring options they said they just used the original spring inside. Spring pressure, per them, should be between 7 and 9 psi.

I was having trouble getting it to respond to my MBC. I changed over to electronic boost control (3-port MAC valve plumbed into my Link Monsoon-X) and now I can get up to 15 PSI but I also feel like its ridiculously sensitive (10% duty cycle gets me 9psi but only 25% duty cycle gets me 15)

[whalenlg]

I emailed Dave Lindsey but haven't heard back will just call him next week.

I get 15psi with no control DP connected, just the stock cycling valve. This would seem to indicate the spring is too strong.

[Darwin]

I emailed Dave Lindsey but haven't heard back will just call him next week.

I get 15psi with no control DP connected, just the stock cycling valve. This would seem to indicate the spring is too strong.

Are you the original purchaser of your wastegate or did you get it second hand? I'll be interested what they tell you and compare it to my experience with them. They seemed to not really care much about questions for their products IMO.

[whalenlg]

I emailed Dave Lindsey but haven't heard back will just call him next week.

I get 15psi with no control DP connected, just the stock cycling valve. This would seem to indicate the spring is too strong.

Are you the original purchaser of your wastegate or did you get it second hand? I'll be interested what they tell you and compare it to my experience with them. They seemed to not really care much about questions for their products IMO.

The waste gate was on the car when I got it 4 years ago.
I did get some email feedback from Dave previously, though they are sometimes hard to reach. I did just order a couple of things from them, so that might help.

[whalenlg]

I dialed up Lindsey, Dave answered and we discussed what I am seeing and agreed that the current spring may be too strong. I ordered a new spring at a very reasonable cost.
Perfect customer service on this call. Didn't even ask if I had ordered before until we got to where to ship.

[Darwin]

I dialed up Lindsey, Dave answered and we discussed what I am seeing and agreed that the current spring may be too strong. I ordered a new spring at a very reasonable cost.
Perfect customer service on this call. Didn't even ask if I had ordered before until we got to where to ship.

That’s actually super frustrating. When I talked to him about springs he basically told me there was no replacement option as he utilized the originals.

Either way I’m happy your issue is resolved!

[whalenlg]

Got the spring, installed and it's looking like it will work once I get the car back together.
With old spring - started opening around 12 lbs, fully open at 15lbs only the top port connected.

New spring

MBC fully closed (ie no back pressure to the side valve) - same as max boost from the cycling valve alone.
8 psi - valve starts to move
13 psi - valve fully opened

Turn MBC 1 full rotation from closed (+ direction)
8 psi - valve starts to move
13 psi - valve fully opened

Turn MBC 2 full rotations from closed (+ direction)
11 psi - valve starts to move
18 psi - valve fully opened

Also - I never found any good instructions on how to replace the spring, so here it is with pictures:

(1) Remove wastegate completely from car - remove all attached exhaust parts
(2) Remove 6 x 4mm allen cap nuts from the top of the wastegate - note that this is NOT under spring pressure, so just go for it.

IMG_2032.jpeg (2.78 MiB) Viewed 875 times

(3) Remove cover.

IMG_2033.jpeg (3.27 MiB) Viewed 875 times

(4) You will see a hex allen M6 allen fastener on top of the diaphragm after removing the cap and M8 one on the valve. I used a vice to hold an 6mm allen wrench in the top one and then an 8mm socket drive in the valve.

IMG_2035.jpeg (2.79 MiB) Viewed 875 times

(5) Loosen from the valve side slowly as it is under spring pressure. You can certainly hold the valve down with your free hand when the valve is ready to release
(6) Swap the spring & then in the same viced position, pressure the whole assembly down so that the valve can be rethreaded. Reattached the cover and make sure that if you have a 90 degree port on top, it points towards the port on the side.

IMG_2034.jpeg (2.8 MiB) Viewed 875 times

(7) Put the 6 screws back in the top.

See pics.

[whalenlg]

Fixing error in last post

Turn MBC 1 full rotation from closed (+ direction)
10 psi - valve starts to move
15 psi - valve fully opened

(start of opening goes from 8 to 10 to 11, fully open goes from 13 to 15 to 18)

[whalenlg]

Final Notes:

After trying various combinations of springs, Cycling Valve vs. Lindsey DP Wastegate and having to rebuild my turbocharger, I am finally seeing my desired consistent max boost of 15 psi with:
Stock Wastegate spring
Lindsey DP Wastegate
Lindsey Manual Boost Controller
Evergreen Raptor Turbocharger
1989 TurboS DME Chip (better match for new turbo)

Actions taken
Replaced stronger spring with stock wastegate spring
Updated 1989 TurboS DME Image to change overboost threshold to 18psi (was 15psi)
Replaced Wastegate Diaphragm
Replaced a non working MBC
Resolved a few minor air leaks using a smoke tester
(turbocharger rebuilt by Charlie at Evergreen when it started leaking oil)