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Location:
Auckland, NZ
Registered:
February 2003
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Location:
PNG
Registered:
June 2002
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Re: 1G-GTE GT28 upgrade question
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Sun, 10 August 2003 00:43
 
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I think that fueling will be you biggest problem. Injectors may be a little small and I am sure that the AFM will not meter the increased airflow and will hit the cutout. If you keep boost down things will be able to cope but I think that 14psi may be too much.
Craig
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Location:
Brisbane
Registered:
May 2002
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Re: 1G-GTE GT28 upgrade question
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Sun, 10 August 2003 01:45
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Yeah, there's not much point doing this without upgrading the fuel system and management at the same time. The factory ECU definitely won't cope.
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Location:
Cabramatta, NSW
Registered:
May 2002
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Re: 1G-GTE GT28 upgrade question
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Mon, 11 August 2003 01:42
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Phill's using GT28s isn't he?
He's got problems with either the inlet or exhaust manifold (or both) being too small.
Still didn't stop him from running a 12.44 though... 
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Location:
Brisbane
Registered:
May 2002
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Re: 1G-GTE GT28 upgrade question
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Mon, 11 August 2003 03:12
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I believe he's running T28's, not GT28's.
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I supported Toymods
Location:
south of the big smoke
Registered:
May 2002
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Re: 1G-GTE GT28 upgrade question
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Mon, 11 August 2003 03:39
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norbie is correctamondo!
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: 1G-GTE GT28 upgrade question
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Mon, 11 August 2003 08:33
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He's running turbos from a Skyline GTR's RB26DETT. They work surprisingly well considering how much lag they generate in the GTR. I think the limiting factor he was getting wasn't the inlet manifold in general but rather the size of the throttle body and getting compressor surge if he tried to run more boost.
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Location:
Sydney
Registered:
May 2002
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Re: 1G-GTE GT28 upgrade question
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Mon, 11 August 2003 09:05
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dont forget the differing sizes of t28s on nissans.. compare a t28 off a gtir to the twin t28s off a gtr
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Location:
Cabramatta, NSW
Registered:
May 2002
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Re: 1G-GTE GT28 upgrade question
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Mon, 11 August 2003 23:25
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| justcallmefrank wrote on Mon, 11 August 2003 18:33 |
He's running turbos from a Skyline GTR's RB26DETT. They work surprisingly well considering how much lag they generate in the GTR. I think the limiting factor he was getting wasn't the inlet manifold in general but rather the size of the throttle body and getting compressor surge if he tried to run more boost.
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Last I'd heard, the new throttle body was in and he was still getting the same problems.... Exhaust side is the suspect now.
Getting compressor surge above 5,000rpm from what I remember.
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: 1G-GTE GT28 upgrade question
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Tue, 12 August 2003 01:25
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I thought compressor surge was an inlet problem where the turbos were trying to force more air into the engine that it can ingest...the lovely "choofing" sound 
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Location:
Cabramatta, NSW
Registered:
May 2002
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Re: 1G-GTE GT28 upgrade question
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Tue, 12 August 2003 01:33
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Yup. That was the thought until the new bits went in and the problem didn't disappear...
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: 1G-GTE GT28 upgrade question
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Tue, 12 August 2003 01:35
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Perhaps the issues lie in his custom manifolds 
For the complexity of a twin-turbo setup, a well setup GT25 or GT28 (or one of the luverly HK$ ones) would be my pic and be a lot easier to set up.
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Location:
Auckland, NZ
Registered:
February 2003
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Location:
PNG
Registered:
June 2002
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Re: 1G-GTE GT28 upgrade question
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Sun, 31 August 2003 01:45
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I am currently going down the same track myself. There is no such thing as a GT28 in the Garret catalog!
From what I can work out a GT28 is a GT25 with a T3 .60 wheel trim 0.60 A/R compressor housing, 1.83/2.37 wheel diameter, compressor flow of 31 lbs and 0.64 wheel rrim 62 rurbine stage (wheel diamter 1.64/2.09) This turbo is rated at 290hp and will bolt up as a t03/t28 replacement.
There is a range of small frame GT25 turbos rated from 350hp to 440hp. Again turbo resalers will fabricate anything you want. However the standard delivery from Garrett references these as the GT25 SB8004 and SB8005 with 350 and 440 hp respectively. These both use T04S 0.70 A/R compressor housings while the smaller has a 0.64 A/R Turbine housing and the larger a 0.86.
Between these is a range of turbos designated GT25/35 that use various trim GT35 compressor housings and a range of turbine housings between 0.64 and 0.86. Hp rating is from 350 to 370 and would be constucted to suit varying capacity engines.
You then move onto the large frame turbos GT30 etc which use an external wastegate.
I run the risk of attracting lots or arguements here 'cos if you look at the catalogs from turbo retailers they list lots of variations to this. They also quote very different hp figures. for example I have seen the GT25 8004 quoted at 350 hp (garrett site) to 400 hp (Ballistic Concepts). 'Spose it all realtes to boost.
The advise that I received from my supplier was to go for the GT25 8004 for my 1GGTEU. Basically the comment was that the GT28 combination was 'old technology' and you would only go down that path if you were needing to bolt up to a T03 manifold.
Phew! That gets the turbos out of the way.
As for the AFM. If you are going after market for the computer you will be able to discard the AFM and move to a MAP sensor. I also plan to replace the throttle body with one off a EB manual Falcon. This gives me a larger throttle body (55mm to 65mm), it bolts up to the original location (need to enlarge the hole and do a little welding) and allows you to get rid of the Toyota Idle Stepper Motor and employ the Ford idle control. Just let your computer supplier know when you are ordering. I also plan to use the Ford Air Tempeture sensor and retain the Toyota water Tempature sensor (let them know this too).
With all of this you will need more fuel - higher capacity pump and larger injectors. I plan to use injectors off a 7MGTE. These are 430cc as against 225cc for the gen2 1GGTE and 245cc for the gen3. They are a bolt up and you can use the Gen3 plugs or source plugs off a 7MGTE if you have a gen2.
I think that has answered all of your questions. Just one more thing I have also discarded the butterfly(s) on the head side of the inlet manifold and all of the attachments for that. I also got rid of the start injector.
Craig
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: 1G-GTE GT28 upgrade question
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Sun, 31 August 2003 07:57
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There is a GT28 persay, but Garrett doesn't sell it as far as I can gather. The actual turbo is reserved for HKS turbos.
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Location:
PNG
Registered:
June 2002
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Re: 1G-GTE GT28 upgrade question
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Sun, 31 August 2003 22:16
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Frank
Ballistic Concepts market a GT28 as a Garret turbo.
Craig
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Location:
Sydney
Registered:
September 2003
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Re: 1G-GTE GT28 upgrade question
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Tue, 30 September 2003 14:00
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Ballistic Concepts and Garrett are one and same.... check this direct from Garrett Website
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Beginning in 2002 - the Ballistics Concept Product Line will now be known as "Garrett Performance Products"!
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And regards to whether there's a Gt28?? Yep, there is... there's one on my car .
I don't think it's product code matches up though... maybe it's officially known as a GT28BB or something?
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Location:
Malaysia,Kuala Lumpur
Registered:
July 2002
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Re: 1G-GTE GT28 upgrade question
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Tue, 30 September 2003 15:56
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Someone please EDUCATE ME !!
From what i've read so far,
the RB26 Turbos will bolt on to the 1G ? True / False
or i have to make custom manifolds for this .
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Just one more thing I have also discarded the butterfly(s) on the head side of the inlet manifold and all of the attachments for that. I also got rid of the start injector
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What Butterfly ?? Head side of the inlet manifold ? Any benefits to this ???
And the start injector ..what would removing this benefit ??
cheers
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: 1G-GTE GT28 upgrade question
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Wed, 01 October 2003 00:39
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The T28's from an RB26 are not just going to bolt up. Its highly unlikely there will be enough room for them anyway.
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Location:
Brisbane
Registered:
February 2003
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Re: 1G-GTE GT28 upgrade question
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Wed, 01 October 2003 12:18
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| dispatcher wrote on Wed, 01 October 2003 01:56 |
Someone please
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Just one more thing I have also discarded the butterfly(s) on the head side of the inlet manifold and all of the attachments for that. I also got rid of the start injector
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What Butterfly ?? Head side of the inlet manifold ? Any benefits to this ???
And the start injector ..what would removing this benefit ??
cheers
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there are butterflys in the second intake runner for each cyl. They are in a plate that sits between head and intake manifold - and are regulated by manifold vacuum/pressure. i think they open up at higher flow allowing air to flow to second intake valve in head. (is this right?)
is debatable what benefit it provides other than to reduce airflow at low engine speeds/load so it doesn't run lean (i think). I'm trashing it as i'm not going to use the toyota engine mngt.
plus if you run the engine hard they'll be open anyway - and if the mechanical controller fails, it will be in the closed position.
start injector is only used when engine is cold - if you use aftermarket ECU, you should be able to set some sort of cold-start enrichment.
charles.
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I supported Toymods
Location:
south of the big smoke
Registered:
May 2002
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Re: 1G-GTE GT28 upgrade question
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Wed, 01 October 2003 14:19
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is the single turbo conversion up and going?
if so how did it go?
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Location:
newcastle nsw
Registered:
May 2002
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Re: 1G-GTE GT28 upgrade question
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Thu, 02 October 2003 05:06
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there seems to be a few single 1g conversions on the go, all will be revealed in a month or so 
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I supported Toymods
Location:
Perth
Registered:
May 2002
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Re: 1G-GTE GT28 upgrade question
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Thu, 02 October 2003 05:34
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Although this one would have to be one of the sexiest ones I've seen: 
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1G-GTE GT28 upgrade question
