I'm guessin' that since his was ZZP, it was set up to bypass the supercharger at full spool?

 

well, they frowned upon it because it was pushing the limit of the tune, it was tuned for like 21psi and that allowed for some room to increase the boost, it was setup for the bypass valve to open when the turbo was spooled i believe, there were 2 boost controllers, one for the blower and one for the turbo, i think the one on the blower controlled when the bypass valve opened; the one on the turbo controlled how much the turbo would push

 

Did they use the factory blower by-pass to do this? And would a blow off valve be sufficient for regulating the turbo's output?

 

yea they used the factory bypass valve, and BOV doesnt regulate what the turbo pushes, i think you are thinking of a wastegate....on his setup he had a TiAL 44mm wastegate, if you want to regulate the boost this way, whatever wastegate spring you use will be what boost you are running im pretty sure, so for example if you had a 10 lb wastegate spring, the wastegate will open at 10psi and will let the excess boost out and you will be running 10psi, does this make sense?

i dont think this would be a good method of regulating your boost on twincharge setup unless you were running a compound setup and only wanted the turbo pushing a low amount of boost that would get recompressed by the blower; this type of setup is different than what ZZP does and i think running a compound setup would generate alot of heat considering you are recompressing compressed air; with the bypass setup after the turbo spools the bypass is open and the blower is pretty much free spinning and the turbo is doing all the work then, the blower spinning still generates heat im pretty sure but not the same as compressing already compressed air from the turbo

if im wrong about anything i said, anyone feel free to chime in and correct me lol

 

Ok. I was looking at manual adjustable boost controllers on ebay. What exactly are they doin'? Do they control boost pressure being sent to the wastegate to open it? I hate to be a pain in the ass here, but I believe I've almost got this crap figured out. I haven't dealt with turbos a lot, and when I did, it was on diesels. That's a slightly different world.

 

ok it can be kinda complicated trying to visualize it, and i may not be able to explain this in the best way but i understand how it works pretty much in my head lol so i found someone that put it in words pretty well;

"if a wastegate is set to 6 psi, it means that it will NOT allow it to create more than that for moe than a split second.

the wastegate sees pressure via a vacuum line off the map/intake manifold area. once 6 psi has been reached and is shown, the wastegate will open how ever much is NECESSARY to bleed out the exahust gases BEFORE they spin the turbine wheel, so that no more exhaust flow hits it to spin it. of course, this happens so fast, and its on of on part off on all within 1 sec.

now, when you throw a boost controller into the mix....
basically, what it does is it tricks the wastegate.

by the same example, your wastegate spring is still 6psi, and the boost controller is set to 10 psi.

now, what the boost controller does is it gets Inline between the reading from the map/IM vacuum and the wastegate and basically, sends the waste gate a false signal. it "bleeds out" the vacuum to the wastegate, so that it thinks its only hitting say 4 psi at 8psi on the boost controller, so that it will continue to generate boost and not open the wastegate until the boost controller sees 10 psi. now, the bosot controller sees 10 psi and it lets a 6 psi signal back to the wastegate, so it opens/maintains that boost level."

does this make sense?

 

Proud of you Mark. That is all. Oh and Chris's old setup is MINE

 

That's pretty well the way I was picturing it. That was a good write up, I appreciate the written visual aid there.

 

No problem
some of it is just turbo stuff but the twincharge setup isnt something everyone has seen/worked with regularly, it was fun while it lasted to say the least, sad to see it go

Thanks tom

Chriss old stuff is all yours

It should be fun

 

What happened to it?? Wasn't engine failure was it??

 

Nope not engine failure, a boost issue that couldnt be figured out by himself, zzp and a local speedshop; so he eventually took off the twincharge and just went back to the blower and then sold the car a few months later, all of this was over a year ago lol but now he thinks he knows what the solution to the problem is

...he didnt start having the issue until several months after having the kit on; so for several months he had plenty of daily driving and spirited driving of course lol

 

Does the boost controller for the blower by-pass work off of turbo boost or post-supercharger boost?

 

I've got a few other detail questions if anyone can answer and/or post pics. Do the MAF and IAT need to go between the turbo and the throttle body, where does the signal for the boost controller for the supercharger need to be (pre or post- supercharger), and what is the best sounding non-fluttering BOV to use (I've been thinking of goin' with ah HKS SSQV), and what dimensions should I look for to get a well fitting FMIC?

 

You should search "twincharge" and read what other people have done.

 

MAF needs to be between the turbo and post BOV and i would assume the IAT sensor would be in the same vicinity;

my buddy had a TiAL BOV

This is a vid of some daily driving with the BOV

http://img532.imageshack.us/i/mov01308ph5.flv/

here is the thread he posted when he had it done about 2 years ago, it might have some helpful things here and there and some pics are in there that may help in someway maybe, vids are in there too lol

https://www.cobaltss.net/forums/show...ht=twin-charge

 

If you have the MAF between the turbo and BOV you will have to run a recirc type BOV system to avoid complications.

I thought the IAT sensor is part of the MAF sensor.

The boost "controllers" for the blower will be will be connected to the rubber vac lines that run off the blower. They are actually air compressor regulators set at different psi to controll the bypass (these along with a little tuning)

Look on youtube for different BOV sounds. That is how you should pick.

Lastly, look on hahns website for there intercooler that comes with the stage V. That is a dimension you could use.

 

I said MAF between the turbo and post BOV, i guess i shouldnt have used the word between lol i meant between the turbo and the blower in the charge piping and make sure the MAF is post BOV, if you put the MAF before the BOV you will run into problems cuz the MAF will read certain airflow and then the BOV will release some air and the actual amount of air entering the engine is now different than what the MAF read

 

Thanks guys. Just wanted to confirm my assumptions.

 

Giggity, soon Mark. Soon

 

Damn, I can't wait to get all this together!!

 

Does anybody know what the thread size/pitch is for the oil supply port on the back side of the engine. I'd like to avoid spending $17+shipping on a friggin' fitting just 'cause I don't know what thread it needs to be.

 

Run a stock pulley. I would run a bigger turbo going twincharge. 3076 spoils quite fast, what would be the point of twincharging with that turbo other than you already have it.

 

Right, I said that lol
What turbo do you run on your setup Ryan? Last I saw, you ran 11.09 @ 132
Probably one of the fastest cobalts, if not the fastest lol