boost prob , cant get any more than 10psi !!!!
- Thread starter turbonutter
- Start date
nope its not bad at all at 10 psi, yep runnin 50mm wg, and if you have the same one then they are set at 10.2 psi. not bad though for the money spent.
turbonutter said:
was a none standard ct26 , i bought the car with a few things done to it , mind u it didnt last long at that boost !!!
It's time for 3" mandrel free flow exhaust my friend. It will let that turbo flow.. You will be shocked...
supramike7m said:
yeh it dont go to bad hey
they do have a 10.2 psi spring !! i though it was around there but just looked on there ebay site and the kit i bought said 10 - 19 psi
cheers bud
supramike7m has the same kit and tells me the spring is set at 10.2 psi think thats me problemJoel W. said:It's time for 3" exhaust my friend. It will let that turbo flow.. You will be shocked...
i wanted to run this turbo for a while them go 4 sumthing a bit better and was gona change the exhaust at the same time
The spring(10lb) is the stock boost level now with the boost contoller D/C. 10-19psi spring means stay within that range with your controller.
With the waistgate disconected. Your boost should go to dangerously high levels.
So no, I think it's your exhaust that is the bottleneck personally.. imo
Mike: get a boost controller or a heavier lb spring or adjust some preload into your waistgate actuator(shims)..
With the waistgate disconected. Your boost should go to dangerously high levels.
So no, I think it's your exhaust that is the bottleneck personally.. imo
Mike: get a boost controller or a heavier lb spring or adjust some preload into your waistgate actuator(shims)..
Even if the WG spring is set to 1psi, its not going to open if you remove the vacuum source to it. Removing the vac source from the wg will cause you to overboost until you hit fuel cut or go boom. If you can't boost over 10 psi, then you would have a boost leak somewhere, I somewhat doubt a 2.5" exhaust is going to limit you that much. It would be cheaper to do a pressure test of your IC piping than to replace the exhaust if you don't need to.
Joel W. said:Matt: I agree, but he said he does not have a leak.. Always good to double check of course..
So many times I swore my connections were tight, until I applied pressure and watched what actually happened when I wasn't behind the wheel. I would hope for a boost leak, much easier to fix.
I have chased leaks also. I finally welded 1/8 inch beads around all my IC piping and I replaced the rubber with 4ply silicone hose and T-bold clamps. No more leaks...
Joel W. said:
I'll be doing the same when I make my IC piping. I never want to have to worry about blowing a coupler off on the hwy. Not so bad if you're running a blowthrough MAF or MAF-less. I blew a coupler apart saturday after I upped my boost to 10psi, of course I'm still on the stock piping. Not fun limping home.
mixmastermatt said:
Hang on a sec... if you have a spring that weak, surely the exhaust gases will simply push the wastegate open themselves! This is why there is a spring on the wastegate in the first place, to stop this happening.
Last edited:
mixmastermatt said:
i just cary tools with me and fix it on the side of the road or in a parking lot:evil2:
Heckler said:
It was a hyperbole to make a point. I understand how wastegates work, don't worry.
Last edited:
cheers for all the imput guys , been away trucking and just got home to read all this .
well im gona go dobble check all my pipe wrk to see if it leaking , as i dont realy wana change the exhaust yet , im due to go on the track at the weekend and wana bit more boost !!
let u no how i go!
well im gona go dobble check all my pipe wrk to see if it leaking , as i dont realy wana change the exhaust yet , im due to go on the track at the weekend and wana bit more boost !!
let u no how i go!
Nutter, once you figure out why it won't boost with the wastegate disconnected, you should be able to adjust the wastegate preload by turning a set screw on the top of the wastegate, this will raise the "no boost controller" boost up to around 19 psi, then you can use the boost controller to really crank it if need be. If you don't have an adjusting screw for the preload, then the boost controller alone should be able to pull the boost up to 20 or so.
Honestly it sounds like a restriction in the exhaust or a huge boost leak, but with a leak that big, you should hit FC dues to the massive amount of air your turbo would be sucking. The other possibility would be that your header flange is warped and isn't sealing against the head enough to build boost. I've had a pre-turbo exhaust leak limit me to 6 psi before...
-Jake
Honestly it sounds like a restriction in the exhaust or a huge boost leak, but with a leak that big, you should hit FC dues to the massive amount of air your turbo would be sucking. The other possibility would be that your header flange is warped and isn't sealing against the head enough to build boost. I've had a pre-turbo exhaust leak limit me to 6 psi before...
-Jake