wierd problem need help

[farmer]

i took my rb26 out today and went to give it on the street and the car bucked and then would not run anyboost. I took it back to the shop and pulled of the turbo intets and found that the back turbo was seized up. I know what caused the problem, i wired up my boost controller wrong and i did a third gear pull at 25psi. (stupid i know). i figured out what was wrong and fixed it but it was too late .

So my question is this , would a seized turbo cause my car not to run any boost in the car when im on the gas , or do i have another problem with the car. the car idles fine and there is no miss, and everything else looks fine.

if you guys could shed some light on this it would be great

thanks

farmer

[foCk]

if the turbo isnt spinning I doubt its gonna be able to create boost

[farmer]

well one was seized and one was still working , my theory is that casue the one wasnt building boost ,there was a big difference in maf readings, and so it wouldnt let the car go into boost, thats what i think but im not sure if its the case

farmer

[Darius]

It's definitely more difficult to get exhaust gases to pass through a seized turbo so it's causing more exhaust gases to go through the good turbo and increases the load on IT. Probably get some damn quick spooling on that one turbo though

And yeah you're probably right about the difference in MAF readings causing problems. Replace the turbo and you should be good to go.

[nukeone]

It's definitely more difficult to get exhaust gases to pass through a seized turbo so it's causing more exhaust gases to go through the good turbo and increases the load on IT. Probably get some damn quick spooling on that one turbo though

And yeah you're probably right about the difference in MAF readings causing problems. Replace the turbo and you should be good to go.

Correct me if I am wrong but a stock rb26 twin turbo has a split exhaust mani, meaning 3 cylinders feed the front turbo and 3 cylinders feed the rear turbo. If one seizes, there is no sharing of load. Instead, you basically shut down half of the engine. Unfortunately, the other half is still running so the "dead" cylinders are stroking with no exhaust path except thru the wastegate. If the wastegate is closed (i.e., boost controller installed backwards), the overcompression could lead to a blown head gasket or more catastrophic results. I would check the engine closely before simply replacing the turbo. At idle, the turbo may allow some flow but, even if totally blocked, the wastegate would open if the blocked flow begins to build pressure and you probably wouldn't know that it is open.

[Darius]

Good point, forgot about that.

[gawdzilla]

prolly not a good idea to step on it at this point. any boost you would build will probably back flow through the compressor side of the rear turbo, giving you no boost

[farmer]

well i took the turbos off the car and found the back turbo is seized and the front one was ok , so my theory is that the back one seized and thus the difference between the maf readings indicated there was a problem and the computor wouldn't let the car go into boost. So i now i have drained the oil out of the car and replaced it with new oil and filter , im also installing two brand neused turbos on the car, i will be hoping to fired up the car mid week and then ill see if there is any other problem with anything else.

thanks

farmer