Philia_Bear
Julian;101558 wroteOk cool beans, so even if mine is non adjustable the arm should just connect up to the new housing?
Yesm
Julian
I spoke to a friend today who had a car with the twin turbo Toyota 2JZ engine who said that when he had a larger exhaust fitted, the extra flow and performance of the turbos meant that the wastegate could no longer spill enough gasses to stop boost pressure climbing, so over long acceleration runs it would increase beyond what he wanted it to. Is this known to be a problem at all when fitting a less restrictive exhaust/turbine housing to 850s?
Julian
Oh, one last question, will I need to order a metal gasket or something for the mating surface of the new turbine housing and existing turbo?
Philia_Bear
Julian;101621 wroteI spoke to a friend today who had a car with the twin turbo Toyota 2JZ engine who said that when he had a larger exhaust fitted, the extra flow and performance of the turbos meant that the wastegate could no longer spill enough gasses to stop boost pressure climbing, so over long acceleration runs it would increase beyond what he wanted it to. Is this known to be a problem at all when fitting a less restrictive exhaust/turbine housing to 850s?
With a 3.5" system with a side dump it is known to happen
You have zilch issues with a 3" full system
deleted_user_160
Remember the twins on a jz are tiny. Great sized for a 1lt motorbike.
Vee_Que
Julian;101621 wroteI spoke to a friend today who had a car with the twin turbo Toyota 2JZ engine who said that when he had a larger exhaust fitted, the extra flow and performance of the turbos meant that the wastegate could no longer spill enough gasses to stop boost pressure climbing, so over long acceleration runs it would increase beyond what he wanted it to. Is this known to be a problem at all when fitting a less restrictive exhaust/turbine housing to 850s?
Yeah, two turbos on a 3lt 6, one turbo in a 2.3l 5 cylinder. You can port the waste gate housing to help it, but otherwise going to the larger 19t rear housing which is a td04hl 7cm? It won't be an issue. Housing isn't tiny.
Julian
Ok, gonna take the car into an exhaust place i called today for them to check it out. They reckon $1350 for 3" mandrel bent downpipe, 3" piping thereafter, high flow cat and mufflers.
The guy asked me about the current o2 sensor setup, and i recall reading that people sometimes need to relocate these or extend the wiring or something? Or was that just for obx systems where the plug for the sensor was further past the cat? Just trying to get an idea of whether any sensor relocation is needed or something. Do our cars run one both before and after the cat?
Very happy with how quick the housing arrived. Ordered Friday afternoon, arrived Wednesday morning!
Philia_Bear
one before cat and one after
Julian
Ok thanks, so with the larger exhaust and high flow cat I'd still want the bungs in pretty much the same spot?
Vee_Que
Iirc the rear one isn't used on the 850r? Anyone confirm that?
Jamest5r_
Only 1 before cat on the 850, only 1 on the v70r fwd, pre me7 car's
Philia_Bear
Vee_Que;102137 wroteIirc the rear one isn't used on the 850r? Anyone confirm that?
Stupid us vs aus emissions
Anything 96+ in the usa has 2
Aus market cars probobly only have one
Julian
Ok thanks, I am heading into the exhaust place Monday morning so they can check it out, confirm they can stick to their $1350 quote, and if so I'll be going ahead with it. It'll be super easy to check out the sensor locations in there anyway, it's just been pouring rain constantly here for weeks now so i didn't wanna go laying under the car at the moment.
Why do some people say they get CELs with a high flow cat if the O2 sensor is before the cat anyway?
Jamest5r_
Mighy be worth you're while getting them to put a 2nd bung in there anyway pre cat if you decide to run an afr gauge at a later date saves messing around
Vee_Que
Julian;102217 wroteOk thanks, I am heading into the exhaust place Monday morning so they can check it out, confirm they can stick to their $1350 quote, and if so I'll be going ahead with it. It'll be super easy to check out the sensor locations in there anyway, it's just been pouring rain constantly here for weeks now so i didn't wanna go laying under the car at the moment.
Why do some people say they get CELs with a high flow cat if the O2 sensor is before the cat anyway?
Probably in the states, but the 98> ecus ran two sensors.
Julian
Alright guys, I took the car into the exhaust place today and upon looking at the location of the turbo they decided they wouldn't really want to take the old turbine housing off replace with the new one. So i have to decide whether i wanna stick with my new housing and get a downpipe made, or buy a second hand downpipe to suit the straight flange housing already on my turbo.
Is there much of a gain from going to the bigger outlet housing? Now that I've bought it, it seems a shame not to use it, but could save much heartache. Or is swapping housings not that massive of a job? I could swap it myself then trailer the car there.
$1350 for turbo back 3" mandrel bent with cat and mufflers
Vee_Que
Yes there is, the stock turbo housing size is a restriction to exhaust flow even on a stock turbo, going to the 7cm housing helps with that, as well as going to a 04> xc90 t5 manifold, you will gain flow meaning you're in boost earlier and not overspeed the turbo, which is important with the 19t.
Basically fit the housing and then have the car towed for $80
Spac
Most/all OBD2 cars have two O2 sensors to detect whether the cat is still working properly - the ECU is looking at the signals from both sensors, and comparing them to each other. Too little difference and it will decide that the cat isn't working and spit up a fault code.
I'm not sure how relevant it is once the sensors get old, and possibly after self learning(??) - my S40 race car hasn't spat a code yet despite a completely gutted cat...
Philia_Bear
Julian;102409 wroteAlright guys, I took the car into the exhaust place today and upon looking at the location of the turbo they decided they wouldn't really want to take the old turbine housing off replace with the new one. So i have to decide whether i wanna stick with my new housing and get a downpipe made, or buy a second hand downpipe to suit the straight flange housing already on my turbo.
Is there much of a gain from going to the bigger outlet housing? Now that I've bought it, it seems a shame not to use it, but could save much heartache. Or is swapping housings not that massive of a job? I could swap it myself then trailer the car there.
$1350 for turbo back 3" mandrel bent with cat and mufflers
Not a huge difference in the flat vs angeled flange turbo for the stock 16t compressor side
its only when your getting up to 19t+ sizing that it makes a difference
Also as
@Vee_Que said.. the later R manifold will make a huge difference as well
Julian
Ok, thanks for the quick responses. At the moment I was planning to stick with my existing turbo rather than put a 19T chra in. This was mainly because from what I've heard on these forums, the 19T really needs an ecu upgrade to be of benefit, and i haven't been entirely convinced by the hit and miss stories I've heard about the big players in the world of 850 ecu tunes.
Given the difficulty of ripping the turbo out to change the housing, and the fact that from what i can see my car Is on its original turbo, maybe if I'm ever gonna change it then now's the time...
Does a 19T actually perform worse than my current turbo without an ecu upgrade? Or could i go 19T now that I'm considering ripping out the turbo, and go ecu later on if/when i feel like it?
And yeah, happy to just get the car towed to the shop once I've got the new housing/turbo fitted