Bad Result From My Dyno Read Out Please Help

[tyler p]

hey guys i have r33 4 door gts25t and i hae just had it tuned, i had a massive power drop in my boost when i tryed to run 18 pounds boost topping out on 219kw the chart showed that i had a massive boost drop from 18 and back to 13 pounds and we dont no what is happening.

the car did a good run on just 10 pounds running 200kw with no boost curve so it was werid that it did the boost drop after adding boost.

the car should of made more power as i have the following up grades

t04 high flowed turbo

walbro 255lph fuel pump

z32 airflow meter

metal intake pipe

yellow jacket coil packs

spark plugs gapped to .8

e boost street boost controller

555cc sard injectors

turbosmart 440 fpr fuel pressure reg

3 inch dump pipe

3 inch stainless exhaust with high flow cat

fmic

apexi power fc with controler

xtra heavy duty brass button clutch

what could this issue be was hoping for 270rwkw but massive let down if anyone knows what it could be please let me know cheers

[Trozzle]

Definitely.

[R31Nismoid]

What did the tuner say?

Given we were not there, bit hard to work out. Obviously you have issues, but without knowing what was/wasnt checked, we could go on for 4 pages and get nowhere.

You have obvious boost control issues for a start, so what did the tuner say about that?

[XRATED]

exhaust restriction...

[lachlanw]

maybe the exhaust is too long because its in a 4 door car ? try cut a bit out of the middle and shorten it up

also make sure you dont get a xtra xtra heavey duty clutch when you clutch kick it the whole motor will move forward and hit the radiator

[myRB25DETT]

maybe the exhaust is too long because its in a 4 door car ? try cut a bit out of the middle and shorten it up

also make sure you dont get a xtra xtra heavey duty clutch when you clutch kick it the whole motor will move forward and hit the radiator

I can only hope u'r not serious bout ur comment.. Otherwise its lol'ed..

[tyler p]

tuner said that it might be the turbo tiping over.

another tuner said he thinks its my actuator leaking in the diaphram??

no exhaust restrictions because has been tryed with straight pipe on as well so there is no restrictions regarding to the exhaust..

[Pal]

pic of the dyno sheet would help as well

[MrStabby]

hey guys i have r33 4 door gts25t and i hae just had it tuned, i had a massive power drop in my boost when i tryed to run 18 pounds boost topping out on 219kw the chart showed that i had a massive boost drop from 18 and back to 13 pounds and we dont no what is happening.

the car did a good run on just 10 pounds running 200kw with no boost curve so it was werid that it did the boost drop after adding boost.

That's not weird at all. Its what you would expect if the spring in your wastegate actuator was strong enough for 10 pound but not strong enough for 18 pound. What wastegate actuator do you have? If adjustable, did you try adding more preload?

[hypergear]

Sounds normal for a standard R33 turbine housing. To4E's wheels won't be able to blow that much air out of a small housing. To get 270rwkws you will need a much bigger rear housing with a more free flow wheel assembly.

[The Mafia]

Standard r33 rear housing is on the money. How can you pump that much boost in, and expect it to magically disappear?

Im amazed how many people who have no clue at all about how a turbo works, just get some random "high flow rated at xxx kw" bolt it on, and come on here wondering why it doesn't work?

Have a real good think about this "TO4E" setup.

Get the EXACT SPECS of this turbo and post them here.

Turbine housing size:

Turbine wheel size:

Compressor housing size:

Compressor wheel size:

If you can't or didn't get any of this info when buying it, the you shouldnt have bought it.

[_x_FiReStOrM_x_]

Let me get this straight, you tried to run 18psi. During the dyno run the boost dropped from 18 to 13psi? Or am i way off?

Checked for boost leaks?

[Guilt-Toy]

Boost went.... 26 20 14 9 3pci... each step being 1 second or less.

You know what to check next.

[Rolls]

maybe the exhaust is too long because its in a 4 door car ? try cut a bit out of the middle and shorten it up

also make sure you dont get a xtra xtra heavey duty clutch when you clutch kick it the whole motor will move forward and hit the radiator

I hate you, I just spilt coffee on my laptop!

Seriously though it just sounds like a mismatched shitty highflow turbo that has a small exhaust housing and small compressor. However it could be lots of other things, we need a dyno sheet with AFR and a boost plot to give you any real information, anything less will leave us guessing.

Edited August 8, 2011 by Rolls

[defari]

Boost went.... 26 20 14 9 3pci... each step being 1 second or less.

You know what to check next.

hahaha that laugh is funny

[tridentt150v]

Everyone at work is wondering what I'm laughing at [they didn't hear and can't see the clip]

[tyler p]

sorry everyone im away and everythings been hard to get onto here i have the dyno sheet getting someone to put it up soon for me. my turbo is at mtq currently getting checked out and the actuator seams to be the problem its a geninue garret turbo not some crappy nock off brand. i have the specs but my sheet is all at home and i cant get to them currently cheers for the help ill let u know what happens.

[Rolls]

my turbo is at mtq currently getting checked out and the actuator seams to be the problem its a geninue garret turbo not some crappy nock off brand.

t04 high flowed turbo

You said it was high flowed, it is still highly possible some backyarder put mismatched wheels in the housings and it simply isn't suitable for your engine or power level.

[tridentt150v]

yep, garret make lots of turbos, small ones and standard ones.....heaps. Do you have the serial numbers off the patent plate for it? It might help with the original turbo specs, check if it is a T04 etc?

Not saying its not a good turbo, but just because its a garrett doesn't mean its the right one for your motor.

[Rolls]

yep, garret make lots of turbos, small ones and standard ones.....heaps. Do you have the serial numbers off the patent plate for it? It might help with the original turbo specs, check if it is a T04 etc?

If it has been highflowed by someone it means nothing as they would have changed the wheels.