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Rb26dett Not Liking New Turbos

den001

By den001,
in Engines & Forced Induction

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den001 Proficient

den001

Posted
Posted

i blew the stock ones so i went and bought atop condition set which were steel wheel and abit bigger

they have been in storage for ages so he part numbers are pretty much useless, tis is what gcg told me,

all i can say is that compared to the stock ones the front comp cover is the same size, but the wheel is about 5 cm bigger , the rear housing is a .63 item which is 1 size up from the standard one and the rear wheel is about 8 cm bigger that the stock one,

i pulled off the standard ones myself and installed the new ones doing nothing bodgy, and it always runs 12 psi, but for some reason it spools about 3500 rpm and doesnt really kick in until 6000rpm, the thrbos are rated at 350hp each but i really dont think that upgrading to this size over the stock ones would affct the lag issue from full boost at 3.5rpm to now 6000rpm, this is bullshit

the car has a cat back wiv guted cat and a fuel pump, still got stock front pipe and dumps and stock ecu....

the new turbos are pretty much the same if not abit bigger than n1 items.

could it be wastegate actuators or what??

the car used to go well before with the stock turbos but now it goes harder only over 5500 6000 rpm,

i didnt touch nothing on the timing side of things and all i did was remove turbs and replace.

all help appreciated

cheers

denis

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wrxhoon Grand Master

wrxhoon

Posted
Posted

have you had the engine checked ( compession, leakdown) ? You may have stuffed bores from ceranic dust.

Not knowing exacly what turbos you have i wouldnt be able to tell you when a healthy engine would boost.

R31Nismoid Grand Master

R31Nismoid

Posted
Posted

:)

Get a ruler out of your draw.

Measure 8cm's and add that onto the stock wheel size... you will soon realise that it cant possibly fit into a housing of that size.

So it kinda answers itself really, no need to get angry :)

You really need to have the turbos inspected IMO.

As wrxhoon said already

Not knowing exacly what turbos you have i wouldnt be able to tell you when a healthy engine would boost.

By what your saying, you have no idea what they are. So people can only offer random suggestions as without knowing what sort of turbos are on there, no-one can accurately say you actually have a problem or not. That might be exactly how those turbos work.

You cant accurately say otherwise if you think the rear wheel is approx 12cm in size as i would be exceptionally doubtful of that :rofl:

Also on that, changing turbos and still using:

Stock Pipes

Stock ECU

Stock Cam Gears

Really isnt going to help the situation either

ish Proficient

ish

Posted
Posted

there's a science to rear AR's fella as ina mathamatical calcualtion per CC of the engine , get this wrong and it will spool early for less peak power or larger power which comes on late like your stating ...

700HP-GTR33 Mentor

700HP-GTR33

Posted
Posted
hey take it easy - I'm just trying to figure out how the wheels can be 5cm and 8cm LARGER than the originals and fit in the housings...

I think these measurements are actual sizes and not the increase in size(Bad Sentence Construction)

Also very rude to get a comeback of that nature to a response that was confused about the sentence.

You have been unlucky. I believe you could have the gt-rs turbos or -10 Garrett Turbos making it

a really laggy turbo set up. Now you need to get some dumps, and computer to get them to spool

earlier.

I may be wrong though.

I hope though you are gratefull and not come back like that at me. :)

FATGTS-R Experienced

FATGTS-R

Posted
Posted
they have been in storage for ages so he part numbers are pretty much useless, tis is what gcg told me,

What did you/they mean in saying the part numbers are useless? Useless as in they dont correspond to the actual specs of the turbos or useless as in they cant be seen/read?

I assume your wheel size comparo is meant to be millimetres and not cms as well?

den001 Proficient

den001

Posted
  • Author
Posted

i apoligize for the comment i made before and i got my measurements wrong.

VERY SORRY!!!!

the turbos are gcg built so i rang them up and and quoted the part numbers and they said they were old and wouldnt be able to track down 2 much about them

ive looked at a ruler and by goin off the standard ones i can say these figures are still a guess but more close to bieng the sizes i was trying 2 explain before

rear housing .63

rear wheel is around 10 to 15 mm bigger in total, so 5mm to 7.5mm from centre to end

front wheel is about 10mm bigger in total and same again, 5mm from centre 2 housing,

i really didnt think these sizes would increase the lag as it has,

compression is a healthy 150 dead even over all 6.

the best way for me 2 describe the way it drives is its really laggy in boost up till 9, 10 psi, then it starts taking off, but by the time it is mooving its on 5500, 6000 rpm, the turbos are making boost at 3500rpm 4000rpm but u cant feel the shit until 5500, 6000.

its like driving a s14 or s15 wiv the vct unplugged.. shit down low and then suddenly after a certian rev range off it goes.

i was inking maby it could be the computer, gone fully retarded and rich , coz its sucking some juice bad,

all help appreciated, sorry for comment b4 but he was bieng a smartass.

Tangles Grand Master

Tangles

Posted
Posted
all help appreciated, sorry for comment b4 but he was bieng a smartass.

no he wasnt :P

have you had the GTR on a dyno to see afr's?

if so maybe print it up here for the Professors to scour over...........

den001 Proficient

den001

Posted
  • Author
Posted

i know this sounds stupid and i know its the dumbest thing i can do but i did it aniways just 2 see if it was running rich and retarted,

i pulled it off tap, and went for a drive, just feathering the pedal.

the thing is that i held it flat and its not pingin or nuthin, no afm cutout, but it still has the same shit response.and boost only hits in hard at teh same rpm as b4, no increase in downlow power.

i did this just 2 see if my theory was correct, i put it back 2 normal.

700HP-GTR33 Mentor

700HP-GTR33

Posted
Posted
i know this sounds stupid and i know its the dumbest thing i can do but i did it aniways just 2 see if it was running rich and retarted,

i pulled it off tap, and went for a drive, just feathering the pedal.

the thing is that i held it flat and its not pingin or nuthin, no afm cutout, but it still has the same shit response.and boost only hits in hard at teh same rpm as b4, no increase in downlow power.

i did this just 2 see if my theory was correct, i put it back 2 normal.

There is a Turbo set up with a wa fella on here, I forget the name...oh Chad Fletcher.(footballer) If it is really him

He has a N1GTR Motor in a 34gtt , he has boost coming in at around 5500RPM.Nismoid said it was because

the old N1 Turbo's are designed to spool up around there. The interesting thing is he hates this aswell.

The recommendations where to change the turbo's or get some dumps if i recall right. I suspect the units you might have bought are simmiler to these.

Sydneykid Grand Master

Sydneykid

Posted
Posted
There is a Turbo set up with a wa fella on here, I forget the name...oh Chad Fletcher.(footballer) If it is really him

He has a N1GTR Motor in a 34gtt , he has boost coming in at around 5500RPM.Nismoid said it was because

the old N1 Turbo's are designed to spool up around there. The interesting thing is he hates this aswell.

The recommendations where to change the turbo's or get some dumps if i recall right. I suspect the units you might have bought are simmiler to these.

NI turbos will develop over 1 bar at 4,250 rpm if tuned correctly. As usual there are 3 things that he needs tot do..........tuning, tuning, tuning.

:) cheers :)

700HP-GTR33 Mentor

700HP-GTR33

Posted
Posted
NI turbos will develop over 1 bar at 4,250 rpm if tuned correctly. As usual there are 3 things that he needs tot do..........tuning, tuning, tuning.

:laugh: cheers :D

:):):)

He had the old N1 turbo's these spool up at 5000RPM Plus. Yes the new N1 Turbo's spool alot earlier

as you have stated.

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