CCarlisi

I have the above mentioned mods and with the boost set to .90 (with the default duty cycle settings) I'm only getting .81 kg/cm2. If anybody can post their numbers so I can compare I'd greatly appreciate it. I can of course raise the boost by playing with the duty cycle, but I don't want to do that to compensate for a leak ect.

Thanks,

Chris C.

rynberg

I don't think you could hit over 11 psi with a boost leak.

That's another advantage of having a separate boost controller though. Besides the underhood checks, I can just turn the controller off and verify I'm still hitting 7 psi easily.

It sounds like you're fine, you just need to adjust your duty cycles.

SleepR1

Setting 1, is 0.80 kg/cm^2, for BOTH primary and secondary turbos, with 74% wastegate solenoid duty cycle for BOTH primary and secondary turbos.

Autometer boost gauge reading is ~11.4 psi for both primary and secondary turbos. I have Japan spec FD Type RS/RZ twin turbos (they spool up FAST!).

Setting 2 is 0.90 kg/cm^2, 84% duty cycle. I have not actually tried this setting on the street yet, since Setting 1 @11.4 psi is MORE THAN ENOUGH on the street, and is the perfect boost setting for track use.

Setting 1 boost control target with the Power FC is spot-on @ ~11.4 psi as displayed by the Autometer boost gauge (only 1 psi gradations on the Autometer gauge), with a slight dip at the 4500-rpm switchover, with boost rising quickly back to 11.4 psi after 5000 rpm and staying @ 11.4 psi to the 8000-rpm redline.

I'll need to try Setting 2 @ 0.90 kg/cm^2, ~13.5 psi, with 104 unleaded race fuel, just for kicks LOL I'm sure that boost setting will be a "hoot"

apneablue

I cranked mine all the way up and have the Profec B do all the work.

Rotarded

With my duty cycles in the mid to high .7s, and my boost set to .80, I was peaking at .81 bar on the PFC. That was until I swapped turbos.

Now I'm getting .71 peak with duty cycles set in the low .8s and boost set to .80.

I think we both have some diag. to do. I will be data logging some runs to see if I have some wastegate/transition issues. I will post my findings.

SleepR1

rotarded, which turbos did you get as replacements? just curious...

Rotarded

Hey Manny, I just did an emergency used turbo swap to get me to the Revolution. My secondary was puking oil and I was even blowing oil smoke at idle. The "new" used ones are already blowing oil. I will be making a decision shortly as to what turbos/turbo to go with.

Mike

CCarlisi

Prior to intalling the FMIC and intake I was getting .96 kg/cm2 when it was set to .9kg/cm2 (with std duty cycle settings). As I said before now I'm only getting .81 with the same settings. I honestly can't remember if this started when I put the fmic in or after. Regardless that seems like a lot of boost to lose from an IC swap. I'm going to take a close look at my precontroller (WG for primary) to see if it's venting boost to the secondary.

Thanks for all the replies guys

SleepR1

CCarlisi, The J-spec twins don't use a pill in the wastegate precontrol. There's a solenoid that opens and closes (thus the duty cycle). The Power FC controls this, and does a really good job with it.

rotarded, J-specs, man! Love the low-end grunt. I got boost @ 2500 rpm to 8000 rpm. That's probably the broadest torque curve any turbocharged engine can make LOL

CCarlisi

SleepyR1: I never said anything about a pill, I want to make sure the wastegate door rod is properly adjusted.

Rotarded

Adjusted the pre-control rod in 2 full turns, reset my duty cycles back to where they were pre-turbo swap, and my transition/boost problems have been solved. WooHoo!

*Disclaimers*

Every twin setup is different. The # of turns, and your results, may vary!!!

Be careful with the e-clip holding the rod on. You will lose it in a heartbeat!(I got lucky and found it after it shot off during re-installation)