Jump to content
SAU Community

Recommended Posts

Well....

I brought my r33 rb25det with this insanely big turbo already on the car....looks like a gt35 front but the exhaust housing of it is huge and when i would drive the car it would lag and in first gear kick in at about 6k revs, and 2nd like 5500, but when it kicked in it would sit me back in my seat on stock 7psi,

BUT i recently brought a new DSR 430 turbo, and then raised the boost up to 10psi, it spools up at about 3k and i get full boost by about 4-4500revs

But even though i raised the boost and its hitting boost for longer in the rev range....its actually going slower then the old turbo. The old big turbo i had i would be doing about 60 before changing into 2nd and about 100 at the end of 2nd, and it was on stock 7psi but with this dsr turbo i get to about 50kph in 1st and about 90 in 2nd gear... on 10psi

The DSR turbo keeps power through all the way to redline aswell,

So is this becuase the DSR430 turbo i brought a piece of chinese crap? or do i need a really decent tune? or a high quality turbo such as a garretgt30 or somthing?

Thanks guys!

Link to comment
https://www.sau.com.au/forums/topic/306036-too-big-turbo-vs-normal-turbo/
Share on other sites

you need both, the turbo sounds like ass and the tune probably hasn't been redone since you changed the turbo

Iv brought a power fc, and I have a bosch pump, going to get my injectors high flowed and have a z32 afm lying around, and my hks evc so looking to get it all put in and dyno tuned

But i dont want to have to go back wanting more power, so am wondering what would produce more power...tuned turbo i have now or the big one put back on, because i cant really afford to buy another turbo.... but i might have to i guess :worship:

You are running all of that on a stock ECU?

If so - thread ends. Until you get a decent tune into the setup it's impossible to say what could be wrong/better/worse due to the factory ECU having a fit.

Fark, so it was running a GT35 with probably a 1.06 exhaust housing on a stock ecu, stock injectors and stock AFM?!?!

Yep...guy i brought it off had it on with stock ecu and stock everything apart from fuel pressure reg and intercooler.... i know i need a tune but would want to sus out my turbos before i get the power fc i just brought tuned in...

And would that turbo run any good after the tune with new injectors fuel pump and a z32 etc?

Car seems to run fine so im hoping not much damage was done.... :D

Well that turbo will make a hell of a lot more power than the standard RB25 bottom end could ever handle and the rear housing will make it laggy as hell. So yes it would run after a tune, but personally thats a bad turbo choice for what you want. So i would rip it off and sell it, or atleast get the .86 housing for it.

Please stop saying "Brought" Its bought.

Sell the turbo, get a highflowed stock one. You will need an ECU (Your PFC). Your injectors will be ok for the power output of the highflowed turbo. You will need a decent fuel pump too.

To get efficient power out of the one you have now, it will cost you thousands.

Well iv still got the DSR430 turbo with a .63 exhaust housing... they claim 250kw on a standard rb25 at 1bar with only being tuned http://www.sella.co.nz/motoring/car-parts-...ssories/575cb2/

So might aswell just stick with this and wait to see how the tune comes out?

Oh and how much power can stock injectors handle? was thinking i could get them high flowed but if i dont need to i would like to save the money...

if you have a gt35 wouldnt it be high mounted aswell?

so if you put this other new turbo on you will also need to go back to low mount set up. which means buying manifolds and other bits.

in my opinion u should just buy the smaller ex.housing. i had a gt35 on my 33 gtst with the 0.82 and honestly its not as bad as people make them out to be

^ and that's the problem sometimes.

What one person calls laggy and unresponsive, another person says its not too bad.

Could be they have not been in a better setup, could be they are happy with how theirs is.

Whatever the reason, you need to be open to the idea that there can be better out there at some point.

^ and that's the problem sometimes.

What one person calls laggy and unresponsive, another person says its not too bad.

Could be they have not been in a better setup, could be they are happy with how theirs is.

Whatever the reason, you need to be open to the idea that there can be better out there at some point.

i agree with what you have said above, everyone has there own opinions on what lag is. my opinion is based on going from a standard turbo to a hi flow and then to the gt35. i was of the opinion that it would be laggy before i bought the set up but was advised to for a drive in 1 with a gt35 set up and i was very happy with how it went so decided yeh ill do this for mine aswell. couldnt of been happier with how it turned out.

for the OP, just abit of info with my set up, we pulled 290kw atw on a standard engine with 550cc injectors, walbro fuel pump, PFC and just the usual stuff like exhaust and intercooler.

the engine was still in perfect shape aswell.

i agree with what you have said above, everyone has there own opinions on what lag is. my opinion is based on going from a standard turbo to a hi flow and then to the gt35. i was of the opinion that it would be laggy before i bought the set up but was advised to for a drive in 1 with a gt35 set up and i was very happy with how it went so decided yeh ill do this for mine aswell. couldnt of been happier with how it turned out.

for the OP, just abit of info with my set up, we pulled 290kw atw on a standard engine with 550cc injectors, walbro fuel pump, PFC and just the usual stuff like exhaust and intercooler.

the engine was still in perfect shape aswell.

wow 290atw? how much boost was he running? oh and was that with the .82 housing? when would that kick in about?

Well im happy to deal with the lag...it was bad but i want to get alot of power with what iv already got....and that turbo had it even untuned, as im unhappy with the turbo i have now...but im just unsure... if i did put that big turbo back on and had the same mods as uwissh said...or if a decent tune with the smaller turbo i have now as to which would be better power wise

But the smaller turbo im using now is more driveable seeming im not skidding out in every gear like the other turbo :D

Edited by R33 0wnerrr

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Hi, is the HKS  Tower Bar still available ? negotiable ? 🤔
    • From there, it is really just test and assemble. Plug the adapter cables from the unit into the back of the screen, then the other side to the car harness. Don't forget all the other plugs too! Run the cables behind the unit and screw it back into place (4 screws) and you should now have 3 cables to run from the top screen to the android unit. I ran them along the DS of the other AV units in the gap between their backets and the console, and used some corrugated tubing on the sharp edges of the bracket so the wires were safe. Plug the centre console and lower screen in temporarily and turn the car to ACC, the AV should fire up as normal. Hold the back button for 3 sec and Android should appear on the top screen. You need to set the input to Aux for audio (more on that later). I put the unit under the AC duct in the centre console, with the wifi antenna on top of the AC duct near the shifter, the bluetooth antenna on the AC duct under the centre console The GPS unit on top of the DS to AC duct; they all seem to work OK there are are out of the way. Neat cable routing is a pain. For the drive recorder I mounted it near the rear view mirror and run the cable in the headlining, across the a pillar and then down the inside of the a pillar seal to the DS lower dash. From there it goes across and to one USB input for the unit. The second USB input is attached to the ECUtec OBD dongle and the 3rd goes to the USB bulkhead connected I added in the centre console. This is how the centre console looks "tidied" up Note I didn't install the provided speaker, didn't use the 2.5mm IPod in line or the piggyback loom for the Ipod or change any DIP switches; they seem to only be required if you need to use the Ipod input rather than the AUX input. That's it, install done, I'll follow up with a separate post on how the unit works, but in summary it retains all factory functions and inputs (so I still use my phone to the car for calls), reverse still works like factory etc.
    • Place the new daughterboard in the case and mount it using the 3 small black rivets provided, and reconnect the 3 factory ribbon cables to the new board Then, use the 3 piggyback cables from the daughterboard into the factory board on top (there are stand offs in the case to keep them apart. and remember to reconnect the antenna and rear cover fan wires. 1 screw to hold the motherboard in place. Before closing the case, make a hole in the sticker covering a hole in the case and run the cable for the android unit into the plug there. The video forgot this step, so did I, so will you probably. Then redo the 4 screws on back, 2 each top and bottom, 3 each side and put the 2 brackets back on.....all ready to go and not that tricky really.      
    • Onto the android unit. You need to remove the top screen because there is a daughterboard to put inside the case. Each side vent pops out from clips; start at the bottom and carefully remove upwards (use a trim remover tool to avoid breaking anything). Then the lower screen and controls come out, 4 screws, a couple of clips (including 3 flimsy ones at the top) and 3 plugs on the rear. Then the upper screen, 4 screws and a bunch of plugs and she is out. From there, remove the mounting brackets (2 screws each), 4 screws on the rear, 2 screws top and bottom and 3 screws holding in the small plates on each side. When you remove the back cover (tight fit), watch out for the power cable for the fan, I removed it so I could put the back aside. The mainboard is held in by 1 screw in the middle, 1 aerial at the top and 3 ribbon cables. If you've ever done any laptop stuff the ribbon cables are OK to work with, just pop up the retainer and they slide out. If you are not familiar just grab a 12 year old from an iphone factory, they will know how it works The case should now look like this:
    • Switching the console was tricky. First there were 6 screws to remove, and also the little adapter loom and its screws had to come out. Also don't forget to remove the 2 screws holding the central locking receiver. Then there are 4 clips on either side....these were very tight in this case and needed careful persuading with a long flat screw driver....some force required but not enough to break them...this was probably the fiddliest part of the whole job. In my case I needed both the wiring loom and the central locking receiver module to swap across to the new one. That was it for the console, so "assembly is the reverse of disassembly"
×
×
  • Create New...