GT28R with stock CA?

[JDMSIL80]

Due to financial difficulty, I'm trying to get a turbo upgrade that requires the least parts to add-on just to get it going.

Would GT28R work well with stock components for the time being? Or do I still need to upgrade injectors, MAF, fuel controller all at the same time at least??

If the costs is too much, I may just end up re-building my stock T25 to get it running. Help me out guys~

[onevia1800cc]

SEARCH!!!!!!!!!!!

JUST TYPE GT28R IN THE @#$%^&* BOX!!!!!!!!!

[JDMSIL80]

I searched but couldn't find the answer to my question.

I know the turbo fits fine, but I need to know if my car will run fine without upgrading the MAF, ecu, injectors, fuel controller yet.

The reason is my stock turbo seal is leaking, and I just want a replacement to get my car running..

As I said this is just a straight swap with stock turbo, no boost controller or anything. Would it work?

[mikehutch711]

It isnt an exact 'straight swap'No boost controller or new lines are needed but...- You need to either clock the turbo or use 3 turbo/manifold gaskets to make it fit- You need to slightly bend your stock oil and coolant lines- You might need to modify your hotpipeIts a pretty tight fit in there, I reccomend taking off the entire manifold, putting on the oil lines and whatnot (be sure to TIGHTEN the oil line really well or it will leak) then installing the turbo+manifold in one piece.

Also.. the stock turbo extension will fit, but you have to enlarge one of the holes so it lines up with the bolts on the turbo, the rest of the holes fit fine.

[JDMSIL80]

^I read from FAQ that stock manifold will NOT clear the GT28R or RS. Would SSautochrome manifold, O2 pipe solve this problem?

[NeedCAforS13]

gt28r fits fine under a stock manifold. I am running one now. and quit starting a new thread each time you think of another turbo to try.. just add it to the previous gt2871r thread you had!

Sean

[slownslurious]

and no just changing out a turbo doesn't mean you have to upgrade everything. as long as you don't run "too much" boost (over 12 psi or so on the stock turbo, probably a bit less on a T28) you will be fine.

[JDMSIL80]

^thats what I was waiting to hear

Will I notice any power gains just by switching to bigger turbo without boosting?

[F3600]

yes

[slownslurious]

with a larger turbo, for the same amount of boost you will usually be making a bit more power. But you'll also have more lag, and usually the idea of a larger turbo is a bit more lag in exchange for a more powerful top end. Of course, if you aren't increasing the boost, you'll get the same lag without the payoff at the top.

[r34 gtr]

ok, youll need to remove the heat shields from the manifold to get the compressor to clear. youll also have to use two manifold --> turbo gaskets. youll have to bend the oil lines or get some braided ones. the ssautocrap o2 housing wont even begin to clear so youll have to use the CA one.

its a big difference, i wouldnt want to run it without upgrading the fuel system or MAF. i maxed out my maf in a real hurry on 7psi. damn thing would only get me to about 5k in the higher gears.

- tim

[JDMSIL80]

Tim: I have already ordered SSautochrome manifold/O2/downpipe to replace the stock, would the compressor clear the manifold? or I still need (two) manifold -> turbo gaskets. My 180SX is a JDM right-hand-drive vehicle, would it make a difference in the fitment of the parts I ordered?I searched and found out you had trouble finding a hard intake pipe for GT28R, would the stock intake pipe not bolt up? where did you end up getting it from?The reason I dont want to spend money on MAF is because Im planning to go standalone(AEM EMS), would larger injectors do the job for the time being?

ok, youll need to remove the heat shields from the manifold to get the compressor to clear. youll also have to use two manifold --> turbo gaskets. youll have to bend the oil lines or get some braided ones. the ssautocrap o2 housing wont even begin to clear so youll have to use the CA one.

its a big difference, i wouldnt want to run it without upgrading the fuel system or MAF. i maxed out my maf in a real hurry on 7psi. damn thing would only get me to about 5k in the higher gears.

- tim

Modified by JDMSIL80 at 12:18 PM 8/4/2005

Modified by JDMSIL80 at 12:32 PM 8/4/2005
Modified by JDMSIL80 at 12:33 PM 8/4/2005

[NeedCAforS13]

ok, youll need to remove the heat shields from the manifold to get the compressor to clear. youll also have to use two manifold --> turbo gaskets. youll have to bend the oil lines or get some braided ones. the ssautocrap o2 housing wont even begin to clear so youll have to use the CA one.

its a big difference, i wouldnt want to run it without upgrading the fuel system or MAF. i maxed out my maf in a real hurry on 7psi. damn thing would only get me to about 5k in the higher gears.

- tim

I had none of these problems tim speaks of here. No heat shield removal, or double turbo gaskets. Barely fits, but fits for me... only thing needed was a new oil drain flange for a GT series turbo.

Sean

[JDMSIL80]

Sean, I suppose you are running GT28R as well.

Its confusing seeing different issues amoung you guys who has the exact same turbo setup. but at least I know what can i expect during my installation, thanks!

[legend4life]

Due to financial difficulty, I'm trying to get a turbo upgrade that requires the least parts to add-on just to get it going.

Would GT28R work well with stock components for the time being? Or do I still need to upgrade injectors, MAF, fuel controller all at the same time at least??

If the costs is too much, I may just end up re-building my stock T25 to get it running. Help me out guys~

I have a like brand new GT28R for sale cheap, email me at [email protected]

[JDMSIL80]

^I have ordered mine already, thanks for the offer.

[slownslurious]

am I wrong, or isn't it true that there are different brands of a "GT25" turbo. I mean you could buy a garrett one, an HKS one, ss autochrome one, turbonetics one, etc... my guess is that they are probably slightly different externally while having identical specs...its a guess though. I do that a lot.

[float_6969]

Do what a lot? Guess, or be slightly different externally while having identical specs?

JK! Heheheh

[legend4life]

am I wrong, or isn't it true that there are different brands of a "GT25" turbo. I mean you could buy a garrett one, an HKS one, ss autochrome one, turbonetics one, etc... my guess is that they are probably slightly different externally while having identical specs...its a guess though. I do that a lot.

You can buy the same/similar turbo from HKS, Garrett, and Precision. Anything else will not be a real GT turbo and likely will be totally different. Garrett makes these turbos and they are re-branded as HKS or Precision etc. Precision also casts their own housings to reduce the cost some. The HKS ones have extremely high mark-up in price on them. I would go with a Garrett version.

[slownslurious]

well, any turbo with the same specs would still probably sell as a GT25.also the HKS units have different wheels and center sections, I believe. If precision casts their own housings then they are probably different... even a small difference would explain why some people have "just barely" put it on and others have "just barely" not.

[Skyline25GT-T]

i have a hks GT2530 in my ca18 and exhaust manifold, 3¨down pipe, mid pipe and cat back. Mine´s vx rom. i think this turbo is similar to the gt28rs, im runing on 0.8 bar of boost, i want to know if i can go on 1.1 bar with front mouth intercooler and better fuel pump but with stock inyectors. At this boost the car is almost as fast as a stock impreza sti.

forgive my english im from peru. but here there is almost no fast nissan or nissan enthusiasts there far more imprezas and evo´s

[c-rad]

well, any turbo with the same specs would still probably sell as a GT25.also the HKS units have different wheels and center sections, I believe. If precision casts their own housings then they are probably different... even a small difference would explain why some people have "just barely" put it on and others have "just barely" not.

CHRA's are the same. HKS puts on some super duper special compressor wheel and housing though. As if Garrett doesn't know how to make a turbo.

[JDMSIL80]

Tim: I didn't need two gaskets for the install, but heat shield has to go has you mentioned.

However, Im unable to rev the car pass 4500rpm with full throttle. The fuel/boost would cut off early.

At partial throttle, I can only rev to 5500rpm or so at 1st & 2nd gear.

The more throttle I give, the sooner the fuel cut out on me.

I only upgraded the turbo and fuel pump, the rest is still bone stock.

Is my MAF maxed out like you said??

ok, youll need to remove the heat shields from the manifold to get the compressor to clear. youll also have to use two manifold --> turbo gaskets. youll have to bend the oil lines or get some braided ones. the ssautocrap o2 housing wont even begin to clear so youll have to use the CA one.

its a big difference, i wouldnt want to run it without upgrading the fuel system or MAF. i maxed out my maf in a real hurry on 7psi. damn thing would only get me to about 5k in the higher gears.

- tim

[float_6969]

It sounds like it is. If the only thing you did was what you stated, you could be maxing out the MAFS. Do you have any leaks in the intercooler piping. Are you sure you're only boosting 7psi? What is it doing in the upper gears? (3r,4th, 5th) If you've got a friend with a SAFC and a larger MAFS, you might try swapping them in temporarily and see if that fixes your problem.

[CA19DET]

no one mentioned that GT BB turbos sue a different oil restrictor than regualr journal bearing turbos that came on the CA18

[JDMSIL80]

Im not sure what the boost is set at on the GT28R, but it could be over 10psi so maybe thats why the stock ecu cuts off the boost/fuel.

It cuts off in upper gears (3rd, 4th, 5th) even sooner than in lower gears.

Im gonna try installing a Blitz ecu that has boost/fuel limited removed, just to see if that fixs the problem.

It sounds like it is. If the only thing you did was what you stated, you could be maxing out the MAFS. Do you have any leaks in the intercooler piping. Are you sure you're only boosting 7psi? What is it doing in the upper gears? (3r,4th, 5th) If you've got a friend with a SAFC and a larger MAFS, you might try swapping them in temporarily and see if that fixes your problem.

[Nowhere]

OMG! BUY A BOOST GAUGE!!!!!!!!!!!

it'll take 10 seconds to answer a LOT of your questions with a gauge..

Buy one from a parts store, then return it..Sheesh..

[slownslurious]

my friend got a crappy one for $30 bucks.another friend of mine bought a damned air pressure gauge (the 60 psi kind). It also worked. anything is better than nothing. youre gonna blow **** up, why are you in such a ****ing hurry to do everything? its obvious you got some money in your setup so just chill out before you blow a hole in the side of it.

[float_6969]

Go to a pool store. We sell 60psi pressure gauges for $8.95. I'm actually going to be using one to determine my fuel pressure.

[JDMSIL80]

Calm down guys! Im not cheaping out on gauges.

I already ordered Blitz boost/pressure/EGT gauges but they wont be here for another two weeks.