T28 internal wastegate problem? possible upgrades?

[chipsahoy]

Okay I have a 93' Nissan 240sx with a Blacktop S13 Sr20det. when I did the swap back in February of this year, I noticed it was boosting way to high. Come to find out that the wastegate was back. So I got a new Garrett wastegate from Z1 motorsports for like $25 since it was on sale. as you can tell it has barely been over 2 months and it crapped out again. I was only running stock 7psi which is what the wastegate is factory set for.

so i took the vacuum line off the engine side and blew into it using my mouth, I could hear air coming from the wastegate like the diaphragm inside had ripped or something

Any help or suggestions would be great on possible upgrades or even the ebay ones.

[TheRealSy90]

Go external wastegate.

Also, the diaphrams aren't meant to see vacuum, so you want the hose going to a boost-only source "hotpipe".

[chipsahoy]

wouldn't going external mean that i would have to change the turbo since it is made with a internal setup? okay I get a new wastegate tomorrow and put it on the hot pipe as its boost source. is it okay to have the BOV on a vacuum line?

Originally Posted by TheRealSy90

Go external wastegate.

Also, the diaphrams aren't meant to see vacuum, so you want the hose going to a boost-only source "hotpipe".

[TheRealSy90]

bov is vacuum/boost yeah. And you can weld the internal gate shut when doing external gate.

[chipsahoy]

but don't I need some sort of flange for the external wastegate?

Originally Posted by TheRealSy90

bov is vacuum/boost yeah. And you can weld the internal gate shut when doing external gate.

[jr_ss]

For external, you'd have to have the manifold modified and a "screamer" pipe welded up. Your best option is to find an HKS adjustable wastegate and hook a boost only source to it. Your cheapest option is to purchase another Garrett wastegate and hook it to a boost only source.

[s13mikesr20]

I have a Isis 3871r with the wastegate welded shut and a external and a spare stock manifold price 500+ shipping that a very good deal turbo has less then 300 miles internal w/g are booty

[TheRealSy90]

Also, you don't HAVE to have a "screamer pipe" with external gate, you can merge it back into the exhaust...

[jr_ss]

Originally Posted by s13mikesr20

I have a Isis 3871r with the wastegate welded shut and a external and a spare stock manifold price 500+ shipping that a very good deal turbo has less then 300 miles internal w/g are booty

No offense, but this isn't a forsale thread or the correct location for you to hock your shit. Help the guy out or move on your way without selling him a knock off turbo setup.

[s13mikesr20]

Originally Posted by jr_ss

No offense, but this isn't a forsale thread or the correct location for you to hock your shit. Help the guy out or move on your way without selling him a knock off turbo setup.

Regardless its a different option of fixing his problem and it being a "different" turbo from Isis it has nothing but good reviews and. Dam good price I don't need it.

To fix your issue if I were in your shoes....

Buy a external wastegate and weld the wastegate shut on your t28 40-60 bucks depending if you know a welder or not

The run a external wastegate manifold or weld a vband flange on your stock exhaust Mani if you have one 60-100 $

Buy a external waste gate with a 12 pound spring possibly a 38mm v band setup 100-350 depends on manufacture

Run a screamer dump pipe or a recurulated atmo pipe 50-300 depending on length

Then tear shit up

Or buy a OEM Nissan actuator for 30-120 depending on condition and hope it lasts


Sorry if I was hawking some crap but it is a good clean setup with under 300 miles cause the motor locked up from a shitty previous owner once again much appologies zilvia

[chipsahoy]

I just went with another Garrett 7psi wastegate and ordered a manual boost controller. I'm gonna run my boost source off of my hot pipe vs the big vacuum line coming from the throttle body.