On my blow thru set up I've taken the wastegate actuator signal at the compressor outlet. (The fitting was already there). According to my reasearch this offers the best control over the wastegate,the least amount of heat, but has the slowest spool up time. I've noticed that the CB Performance kits take the signal from the intake manifold. This area is supposed to create the most heat in the system, but offers the best response. According the the book "Maximum Boost", this location should only be considered when turbo response is of the highest importance and the extra heat in the system tolerated or ignored. For the hell of it I've swapped locations to see if there was any big difference and could not sense any. Have any of you guys that run, or have run the CB kit swapped wastegate signal locations, and did you see any difference?
Where are you guys getting yours from? If on a FI system then where would you do it? After the throtle body or before it
Hoxviii wrote: and you take it on the "in" side of the TB.
Justin
So you mean before the TB. Not on the plenum but in between the TB and outlet/coldside of the turbo. Why is this.... and I'm about to run them all after the TB on the plenum side.Should this cause a prob? I was using a draw through carb set up but am now going CIS blow through similar to this
Anything that is boost actuated on an FI setup you plumb before the butterfly because this is where the boost level is the most accurate. Let's say you're running at 10 lbs boost at Standard Temperature and Pressure. lets also say you have a boost gauge setup just before the TB and just after (in the throat of the plenum). The TB gauge will read 24.7 lbs, and the one right after will read slightly less(probably about 22). This is beacause the plenum is larger in diameter than the TB throat. To maintain the same pressure in a larger volume you need more air. Obviously, the plenum can't flow anymore than the TB will allow, so the pressure in the plenum will read less than immediately before the TB. (larger volume, same quantity, less pressure)
how does this effect vacuum signal? I have my boost guage run from a 1/8 npt compression fiting that I tapped in the throttle body cover or hat. It reads boost but it does not read vacuum would I have to tap the manifold to get a boost and vacuum reading? For my new BOV I am getting the signal from the same port as the wastegate with a tee that came in my blitz universal kit.
If you're looking to plumb the BOV though, I think you need to plumb it AFTER the throttle body, on the plenum side. Let off the throttle, plenum sees vacuum, vacuum opens the BOV and out pukes the air that would otherwise cause (might) your compressor to surge. This is from ricer car experience, but I think it is universal.
Hoxviii wrote: and you take it on the "in" side of the TB.
Justin
So you mean before the TB. Not on the plenum but in between the TB and outlet/coldside of the turbo. Why is this.... and I'm about to run them all after the TB on the plenum side.Should this cause a prob? I was using a draw through carb set up but am now going CIS blow through similar to this
samoht wrote:If you're looking to plumb the BOV though, I think you need to plumb it AFTER the throttle body, on the plenum side. Let off the throttle, plenum sees vacuum, vacuum opens the BOV and out pukes the air that would otherwise cause (might) your compressor to surge. This is from ricer car experience, but I think it is universal.
As samoh wrote, after the TB, not before .. then you won't get any vaccum reference when the throttle is closed.
If it's boost actuated it goes before the TB, if it's vacuum actuated it goes after. I was thinking "gauges" for some reason, which is why I talked about before the TB.
