question about single versus twin
- Thread starter sparkplug619
- Start date
drewgo;1198445 said:
no no no.
They USED to...
garrett.com said:
which means that they are now the GT2560R regardless of what it was called before. If you (or anyone else for that matter) is still refering to it as a GT28R, then you, just like them, are wrong.
Here and today, Not yesterday and the past.
ok well then, what does the term gt28r refer too? which turbo? when some says they have a 28r which turbo are they running?!?!?
about the comparison.... i was thinking possibly the gt35r for my goals instead of twins..has anyone tried to autox that turbo before? srry i'm such a pain when it comes to these things. just want to find some answers.
88supraTT;1198871 said:
AutoX low or high speed? For Low speed you would need the proper rear end ,I have GT35R ,0.82 and even with the Dr Jonez Hybrid JZA/MA Diff I found that the 1JZ is still off of its power band most of the time especially when the event is limited to ~50MPh...
hmm... the stuff that i have watched locally is low speed 2nd and 3rd gear, straights and not really any tight turns. i have a 4:10 rear end
drewgo;1198737 said:
Nope. One doesn't exist. The GT2560R does.
LordDigital;1198890 said:
For low speed, there is no need for 500hp. Need to size the turbo to give you the broadest powerband and the GT35r on a 1jz will move the powerband to much to the right on a speed limited course.
On a 7m/2jz. A GT2876R will work quite well. Small enough to spool down low and produce 300 some odd rwhp. Since we are losing .5L on a 1jz.... The GT2864R will probably suite that motor better.
That is why I am always adamant about sizing the turbo to the application not the application to the turbo.
Figgie, whats your stance on sequential twins vs big single? Something like twin t57s vs a single 47-88?
foreverpsycotic;1199129 said:
ok there is an issue here.
Sequential is what the tractor puller use....
IE two turbos, first turbo gets the initial exhaust wave and 2nd turbo then gets the rest. On the intake side the compressor exhaust goes directly into the 2nd turbo compressor intake and the compressor exhaust of that turbo goes to the intake of the motor. That is a sequential setup.
The MKIV supra is still a parallel setup as the exhaust gases from the motor are divided to each turbo sepeartely whether the time for when that happens is the same or not, is irrelevant
Even on a V motor. Single turbo over duals unless the single runs out of breath then have only one choice.
figgie;1199057 said:
I agree that GT25/40R could be a better choice ,simply because with a GT35R you need 4.7 rear end to utilize the powerband ,and no such thing is availible for MK3... However he will quickly find out that the Supra is not good for any low Speed AutoX-ing and would want the GT35R power for some real tracks :icon_wink
LordDigital;1199146 said:
thats why i put the engine into a 2nd gen rx7 :icon_bigg, i'm just trying to find a good turbo setup that can give good throttle response and also have a good peak horsepower..and not so much a peaky power band. I probably sound confusing but..i speak two languages good english and bad english
I don't have any turbo people in the area that i could go bug...so the interwebz is were i need to find info 
I would go single garret!
simpler better cheaper lighter could spool nearly as fast as twins!
If you want fast spool get DBB (ball bearing) + get twin scroll or split pulse turbos!
you could spool as low as 3200 rpms easy with this GT35/40R
get this turbo http://www.atpturbo.com/Merchant2/m...OD&Product_Code=GRT-TBO-006&Category_Code=GRT
then select .78 twin scroll devided housing its T3 but i dont think you plan to make 600-700+hp
on the exhaust housing selection get the "divided T3 exhaust housing with 3" Vband clamp .78ar only!"
get polished / riffled option if you want.
its about 1300 then get your manifold on ebay ~200 then your done with twins the cost for the same performance will be about 2x more.
my turbo is the larger one but i plan to make a little bit more HP and at a higher rpm and shift point so i wouldnt get the 1.06 T4 housing unless you plan to make more then 600HP and get some good cams and expect to hit around 9000RPMS alot
simpler better cheaper lighter could spool nearly as fast as twins!
If you want fast spool get DBB (ball bearing) + get twin scroll or split pulse turbos!
you could spool as low as 3200 rpms easy with this GT35/40R
get this turbo http://www.atpturbo.com/Merchant2/m...OD&Product_Code=GRT-TBO-006&Category_Code=GRT
then select .78 twin scroll devided housing its T3 but i dont think you plan to make 600-700+hp
on the exhaust housing selection get the "divided T3 exhaust housing with 3" Vband clamp .78ar only!"
get polished / riffled option if you want.
its about 1300 then get your manifold on ebay ~200 then your done with twins the cost for the same performance will be about 2x more.
my turbo is the larger one but i plan to make a little bit more HP and at a higher rpm and shift point so i wouldnt get the 1.06 T4 housing unless you plan to make more then 600HP and get some good cams and expect to hit around 9000RPMS alot
Evilempire1.3JZ-GTE;1200689 said:
3200rpm spool on 1JZ sound way too early for any GT35R. Is this theoretical or observed (your car ,dataLogs ,etc)?
suprahero;1201657 said:
1.5J or 1J? On mine 1JZ ,I do not get a full boost to around 3900+ ,same exact setup as you ( 0.82 A/R ,Crower cams) but I do not have the standAlone which helps the spool up quite a bit.
Back on the topic ,sooner or later we will se on the market a consumer Kit to control the bv50g blades via most of the standAlones (currently it works fine with AEM) with manifolds for the great In-Line 6 engines. To the best of my knoladge on Dimitri's unstroked 2JZ with twin BV50G setup ,they were able to achive full boost just after the 1500rpm mark with nearly 450rwhp! The powerBand was Insane ,but the peak power is a little to low to make super profitable kit of RB and JZ engines...
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