Does anyone know where I can get some upgraded solenoids, other than Axiom, for running increased boost with sequential twins? I placed an order with him quite a while ago, and after sending the money through Paypal, pretty much stopped hearing from him. I'm waiting one last week to hear back from him before trying to get a refund, but now I need to start looking around for somewhere else to get them.

Also, if anyone is friends with Rob, or lives near him and can get in touch with him, can you get him to email me? My email is wr_44@hotmail.com.

Thanks a ton.

 

Another option is to put a pressure regulator on the pressure tank lines and set it to 10psi. This will prevent the control system from seeing the increased boost.

Dave

 

could you elaborate? I started running 17psi on seq twins, it all works fine so far

 

That's right, I remember reading about that a while ago. I'll look into it. Thank you very much.

neit_jnf: I don't know about your system, but ever since I went simplified, my wastegate has been sticking open after my first time hitting 4500 rpms. Apparently the stock solenoids aren't able to withstand much more than stock boost levels before they start getting stuck. If your's is working correctly, though, I guess you should be good.

 

the pressure regulator tricks the solenoids to see only 10 psi even though you are actually boosting over 10 psi. I had a regulator put in a while back, and my car no longer had boost problems because the solenoids started to stick over stock boost.

 

Where is the regulator placed?

What brand works well in terms of performance in the hot engine bay and size?

 

Looking at the vacuum diagram it would seem that a pressure regulator placed in the line between the turbo and the pressure tank and set at 10 psi would stop the positive pressure turbo control solenoid from seeing more than 10 psi but the precontrol, wastegate, and charge control solenoids would still see actual pressure. (The charge relief solenoid and vacuum turbo control solenoid, which are the only other solenoids involved in the sequential control mechanism, see only vacuum.)

Of course, the turbo control actuator has perhaps the most important part to play in transition so this approach may be sufficient.

 

From what I understand, the regulator goes on the pressure tank and serves the turbo control pressure solenoid. This is most critical because it has to release against full pressure and I don't think any other solenoids have to do that.

The wg and pc solenoids would not be used in most cases because other boost control methods are more sensible for higher boost.

Dave

 

True. On my setup, for example, I have replaced both precontrol and wastegate solenoids with ball and spring Halmann MBCs (which are very responsive).

However, the charge control solenoid also sees boost pressure and controls how quickly the door is closed in the y-pipe, which will obviously affect transition.

My Datalog logs clearly show my transition degrading with higher boost. I'm going to try just the pressure chamber regulator first to see if it has an effect.

Anybody have any recommendations for a good regulator? Most of the ones I can find on the web have at least a 150psi range; I'd prefer something with a smaller range.

 

you were right in the beginning. Contact Rob Bailey. Do a Search for him on the forum. I cant remember his screen name but go with him. I was boosting 20 psi with his Solenoids with no problems. Well unitl i blew up my stock twins but they will be perfect for the BNRS. They are way worth the money. If you cant get his screen name pm me i have his number.

 

I put the pressure regulator between the check valve and the pressure chamber. There are 2 vacuum lines attached to the chamber. One connects to the turbo control solenoid, the other one connects to a one way check valve and then to the nipple off the y-pipe. The regulator is set to 10psi after the check valve where air is feed into and pressurized the chamber, and the pressure inside the chamber is @ 10 psi (regulated), and the turbo control solenoids therefore only sees 10 psi of pressure.

 

Pressure regulator works well...but it does create a small boost leak over the set pressure. Kinda bothered me back when I used it with my stock twins.





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I did go with him from the start. I paid via PayPal two months ago, and haven't heard from him for over a month. I've sent him several emails and called and left several voice messages. Before I sent the money, he was very good at returning emails, but after the money was sent, he got worse and worse at it, until now I don't get anything back from him at all. I would absolutely love to get his solenoid kit, but I'm starting to have to look around at other options. I'm just hoping I'll be able to get my money back from PayPal, if I don't hear back from him by the end of the week.

 

I've tried contacting Rob as well (e-mail, PM, and phone calls) with no results. I wanted to order his solenoids as well, but wasn't going to send money before I'd spoken with him.

I purchased his Harness bar last year and am very pleased with the quality of his work, it's just a matter of communication.

 

so far is gone lol! lost secondary boost

i'll check the vacuum hoses...

 

I finally got an email from Rob. It turns out he was out of the country for a while. He assured me that the solenoids will ship within a week or two. Thank you all for your help.

 

In that case one of those boost pills could work nicely to throttle that down.

Dave

 

fixed! i guess i'll try a pressure regulator, one of the pressure chamber's hoses popped off...