MAC Solenoid Boost levels & spring strength

[DV8]

Gave what you suggested a go - sadly no improvement. If anything I seem to get the most boost around the 31 - 32 hz range using the MAC valve, going in either direction seem to reduce it.

Any other thoughts?

Would really like to avoid having a mega spring in there if i can. :(

[1158]

Gave what you suggested a go - sadly no improvement. If anything I seem to get the most boost around the 31 - 32 hz range using the MAC valve, going in either direction seem to reduce it.

Any other thoughts?

Would really like to avoid having a mega spring in there if i can. :(

Wow that's really weird. First triple check your lines and the wastegate diaphram. A 7 psi spring should be able to hold to at least 20 psi (maybe trailing off in higher rpm). If everything looks good I would try messing with the boost by gear tables before going to a larger spring.

[DV8]

Wow that's really weird. First triple check your lines and the wastegate diaphram. A 7 psi spring should be able to hold to at least 20 psi (maybe trailing off in higher rpm). If everything looks good I would try messing with the boost by gear tables before going to a larger spring.

Do you mean check the wastegate for tears or damage? Its a brand new wastegate so im hoping its not that.

Will double check my lines tonight - going dyno tuning tomorrow so may just need to opt for a bigger spring to get things going.

[AREA876]

You may have a boost leak, check couplings, clamps and BOV

[DV8]

Just wanted to follow this up, it's def not the Hondata, Solenoid or Wastegate causing the issue.

The car won't make more than 9 PSI even with the Wastegate constantly shut.

Examining turbo and internal Wastegate leak. Also blockages.

Thanks for everyone's help and suggestions. Once sorted I think the solenoid will work a treat.

[forevertrj]

Hello all, I know the threads old but I found it looking for answers, I liked a previous post about setting the variable frequency to 31-34hz and then messing with the duty cycle after, this really helped me figure out that the minimum hondata will save the hz setting is 10hz, also the test output setting within hondatas online(Dropdown)->test outputs(setting) was helpful after I had already sorted out MY frequency range and duty range on the road, if you park the car don't turn it on and test the outputs and set the variable frequency hz to about 10 (bare minimum, and the duty cycles anywhere between about 30-50% to start off with you will here the solenoid ticking, in a pulsing manner, if it sounds like it's going like a bat out of hell the frequency should be lowered(if it was set between 31-78Hz), if the frequency is at the lowest setting(10Hz) reduce the duty cycles, until you hear the solenoid going about in a lazy manner like a tick (wait .5 seconds) tick (wait .5 seconds) tick you get the idea, then increase the duty cycle, until you hear it go tick (delay 0.4 seconds) tick (delay 0.4 seconds) then increase the duty again 1% at a time, now if you get any jumps or pops or lags of the sort with the clicking, i advise increasing the Hz and then decreasing the duty cycles.
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(apparently from what I've been reading every solenoid is different so you'll need to find what makes it tick with the test output settings and listening to it tick at a medium pace and then go up from there)
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here is my understanding of it and their relationship
-Set base var freq between 10-20hz for low boost(10psi) set beetween 20-31hz for higher boost(10-20psi)
10hz @ 30% duty = 2psi (in my application)
15hz @30% duty = 4.5-5psi
20hz @ 30% duty = 7psi
25hz @ 30% duty = 10psi
30hz @ 30% duty = 15psi
-but from what I've read you want to keep the duty % higher as it's more precise when lowering duty% so try this instead
13hz @ 30% duty = 4.1psi (default wastegate spring strength)
13hz @ 34% duty = 7psi
13hz @ 38% duty = 9psi
13hz @ 40% duty = 11psi
13hz @ 45% duty = 15 psi
-By all means this is not perfect, just estimations from real world results i found that the lower hz on my solenoid worked great and didn't sputter, I started at 15hz but ended up lowering it even still. My setup is a B16a JDM motor, Greddy timing belt, Ferrea Valve Springs(turbo grade composite) all the retainers in titanium, new replacement stock valves, and stock brass valve guides replaced(machine work necessary), garrett GT3076R dual ball bearing turbo, running max of 10Psi, ARP head studs Torqued to 82ft-lbs with moly lube(didn't retorque after engine warmed up and they are brand new not reused), Cometic head gasket 0.030" thick(stock thickness) completely stock bottom end, stock distributor and distributor coil(will upgrade in the near future), 850cc injectors(fiveo not the best brand for idle but wide open throttle are fine) will probably upgrade to ID or FIC injectors, later.


Testing---------------------------
Here is how my testing went, I set the solenoid to about 15hz, and the duty to about 40%, (my build is a 4lbs wastegate spring, and my max boost is 10psi that I want to run with the solenoid at work) set 15hz and 40% duty and away I went, second gear smashed above 10psi third gear hit 10psi after a while and fourth gear didn't hit 10psi at all) so I ended up setting the hz to about 12hz and the duty to about 38% now second and third are good to go and I'll have to adjust the duty by gear settings later for fourth gear and fifth. by the way I'm using the 4 Port Mac hondata boost control solenoid, with ports IN/EXT and A and B, and the In port goes to the turbo nipple for boost reference, A port passes boost through into the lower half of the Wastegate, B port comes from the top of the waste gate and exits through the brass air filter on the EXT port, and the boost control solenoid is 100% Duty is maximum boost and is normally closed so if it fails it fails closed. Also with that USDM ecu (north american ecu) the boost control solenoid needs a 12v supply from the auxilary key (II) position, you can take it off the ignition switch and wire up a fuse inline and then the second output is the ECU output on OBDI ecu pin A11, Hondata should say what pins they are within Smanager.