Modifying R33 Gtst

[SLYDA]

Ive got 740cc's in my RB25.. there fine on idle.

[217/r33]

ok so as planed i booked the car in to make up a new intake pipe at sureflow and pick up a new dump pipe and clmap from otomoto.

so come friday morning im on my way to pick up the car, jump in and crank it over. the car starts but is only running on 3 cylinders! BAH!! so i thought ok plugs are flooded because car is running really rich so i take them out and clean them, remove all the fuel from all cylinders, crank her over and she is still missing! ended up having to go thru the elimination proccess

1.plugs

2.ignitor modual

3.coil packs

4.ecu

ect

all of the above were working fine...

i was out of options, the only other possible issue that came to mind was the second hand s15 injectors that i installed. so off came the plenume and the fuel rail! as i was removing the fuel rail 1 injector just started pooring out all over the engine like a tap!

so i removed all of the injectors from the rail and found that 4 out of the 6 seals were broken! ahh last thing i wanted on the day that the car was booked in for some work. so of i went down to nissan, picked up new seals and the injectors went back in. cranked her over and she started firing all cylinders. YAY!

was time to take her down to otomoto to pick up a new dump pipe and clamp and re-book a time with sureflow. on the way there in 4th gear on a hill we put her underload to test boost levels, only to find she hit 18psi !! oh !@#$ another issue.

so i picked up a 38mm external gate that is going to be welded on to the turbo housing.

the car is now apart, will be welding the wastegate next week.

[l0WRB]

yeah mate told you they have boost issues

not sure how ur 38mm is going to go but it SHOULD hold boost fine.

i went 50mm to be safe. u only gotta look at the size of the hole inside the housing its tiny and thats why it creeps lol

good luck with it! keep us updated

[217/r33]

yeah mate told you they have boost issues

not sure how ur 38mm is going to go but it SHOULD hold boost fine.

i went 50mm to be safe. u only gotta look at the size of the hole inside the housing its tiny and thats why it creeps lol

good luck with it! keep us updated

yeah i had a feeling that was going to happen

where did you get yours done? how much?

[l0WRB]

well im not from a city but a small town, i got my mech to do it, he didnt charge me much at all, pulled turbo off,welded up inside of turbo,welded all new gate on, and screamer pipe, and tuned it, cost stuff all lol very pleased

[l0WRB]

i got a pic here off the 50mm in my bay, bit big to fit there so had 2 stand it up.

still works perfect. best investment i ever did lol

[217/r33]

i got a pic here off the 50mm in my bay, bit big to fit there so had 2 stand it up.

still works perfect. best investment i ever did lol

nice work

i'm getting it done this sat. will keep everyone posted on how it goes.

[217/r33]

ok the car is complete and we have the final results

and let me tell you it was a pain the back side to complete! after welding on the external gate and fixing boost issues I was only to find 50km later the turbo blew! BAH was that annoying since i've now pulled it off about 4 times!

anyways otomoto replaced it without question, failure was due to a faulty seal i guess it happens

i completed the setup with new braided water lines, gaskets ect so the setup was now solid.

the car was installed with:

(stock rb25det)

kkr480

38mm external wastegate to atmosphere

kkr dump pipe

trust front pipe

fujitsubo exhaust

apexi power fc

splitfire coilpacks

iriway 7 plugs

z32 afm

s15 injectors

bosh 040 pump

hybrid fmic

hybrid ebc

paul at pulse racing did the tune, end result was 250rwkw on 17psi. the turbo performed really well until we took the boost past 15psi then we hit a massive flow issue. it made the same power on 15psi as it did on 17psi. boost started dropping of back down to 14psi and wouldn't want to go anymore which is really strange with an external gate...

main restriction was in the turbo housing and dump pipe. the otomoto dump pipe is just way to restrictive and just doesn't flow anywhere near enough. also inside the exhaust housing there was turbulence due to the internal gate being welded shut and creating a pocket with resulted in loss of power.

the end result however was impressive, 6000nm of torque and 250rwkw was plenty to play around with. if it wasn’t for the flow issues with the turbo design we should of come close to 270rwkw+ and that’s very impressive for a dodgy kkr.

so in the end it would of been probably cheaper to go with a nice garret due to all the setbacks the kkr gave us. but once again happy with the results and so is the owner

cheers!

[beersandwich]

so the moral of the story is dont buy kkr turbos

[NYTSKY]

WOW it really flattens out at 5500rpm.

[217/r33]

so the moral of the story is dont buy kkr turbos

defiantly better off with a quality product such as garrett, trust or hks.

kkr is not all that bad but it’s a little laggy for the amount of power you get. i guess it’s as simple as "you get what you pay for" in this case.

if your on a really strict budget and you can get the internal waste gate to hold boost (it's probably impossible) then it’s ok for someone who just can’t afford a garrett.

in the end of it all the owner was happy and so was i.

cheers!

[l0WRB]

nice write up.

does it feel strong to 7000rpm?

[217/r33]

nice write up.

does it feel strong to 7000rpm?

thanks mate.

it’s very strong all the way thru the rev range and rev limiter is at 7200rpm from 3rd gear onwards you really start to feel the top end power if you keep pushing it.

the car feels responsive and easy to drive, just a shame for the flow issue otherwise we could of seen some really nice power somewhere around 270rwkw+ the owner doesn’t want to spend more money to fix this issue.

[l0WRB]

yeah thats a bit of a bummer.

i got same mods just a bigger 50mm ext gate, i control my boost from the gate spring, has 14psi spring and ive tighten it to hold bout 1.4bar 19psi in top gears.

im not sure on exact power figure as it kept slipping the tyres from camber on my mechs dyno but was around 320rwhp b4 the slipping,

my mates 33 with gt30 and all the goodies has 350rwhp on 14psi and we are pretty even if we have 100-200 rolls maybe even half a length infront...who knows

id love a gt35r though...make same power on 1 bar not 1.4

[217/r33]

yeah thats a bit of a bummer.

i got same mods just a bigger 50mm ext gate, i control my boost from the gate spring, has 14psi spring and ive tighten it to hold bout 1.4bar 19psi in top gears.

im not sure on exact power figure as it kept slipping the tyres from camber on my mechs dyno but was around 320rwhp b4 the slipping,

my mates 33 with gt30 and all the goodies has 350rwhp on 14psi and we are pretty even if we have 100-200 rolls maybe even half a length infront...who knows

id love a gt35r though...make same power on 1 bar not 1.4

i bet it feels much nicer to drive with the gt30 in it? he would probably have you for response and off the lights.

and again 14psi is not that much strain on the good old rb25, why didn't he up the boost to around 16-17psi? would of got close to 300kw with the right setup.

i guess kkr is not bad for the price...

[l0WRB]

i bet it feels much nicer to drive with the gt30 in it? he would probably have you for response and off the lights.

and again 14psi is not that much strain on the good old rb25, why didn't he up the boost to around 16-17psi? would of got close to 300kw with the right setup.

i guess kkr is not bad for the price...

yeah man its very smooth power delivery and good response .63 exh .7 front cover..

he wants to eventually run 18psi but having boost creep issues with tial 38mm gate..not holding boost properly once he tries to wind some into it...

yeh kkr arent 2 bad for price...screamer pipe on 19psi sounds animal specially wen u jus pop limiter and makes a huge crack noise haha

[217/r33]

yeah man its very smooth power delivery and good response .63 exh .7 front cover..

he wants to eventually run 18psi but having boost creep issues with tial 38mm gate..not holding boost properly once he tries to wind some into it...

yeh kkr arent 2 bad for price...screamer pipe on 19psi sounds animal specially wen u jus pop limiter and makes a huge crack noise haha

hmm thats strange, the 38mm should be just fine for that sort of application, i suggest looking at the ebc before anything els.

yeah the screamer is really nice, i set one up on this setup and it sounds awesome