Upgrading to T-78
12-01-08, 06:01 AM
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Upgrading to T-78
I currently have this set up in my car and i think it is pretty much ready for the transfer.
1) Street ported w/ 3mm Apex Seals 2) Aereomotive fuel pressure regulator 3) 850 primary injectors & 1600 secondary injectors 4) Racing pulleys 5) 10 gauge spark plug cables 6 )3 row koyo radiator 7) Greddy front mount intercooler w/ greddy elbow 8) All brand new silicon vaccum & radiator hoses 9) New turbo filters 10) Manual boost controller 11) Boost is @ 13.5 pounds 12) Apexi ECU w/ display screen 13) Autometer boost, pyrometer, oil pressure, and water temperature gauges 14) 3" downpipe, midpipe, and exhaust 15) New stage 1 clutch 16) Brand new tires 17) New tokico illumina adjustable shocks 18) New drilled & slotted brake rotors w/ organic brake pads 19) New optima battery relocated to the trunk w/ all new ground wires.
And im now thinking about swapping out the twin turbos for a greddy t-78, any recommendations on any more work i should do to the car before the swap?
also what kind of horsepower and boost do you think Ill be running with the 78
1) Street ported w/ 3mm Apex Seals 2) Aereomotive fuel pressure regulator 3) 850 primary injectors & 1600 secondary injectors 4) Racing pulleys 5) 10 gauge spark plug cables 6 )3 row koyo radiator 7) Greddy front mount intercooler w/ greddy elbow 8) All brand new silicon vaccum & radiator hoses 9) New turbo filters 10) Manual boost controller 11) Boost is @ 13.5 pounds 12) Apexi ECU w/ display screen 13) Autometer boost, pyrometer, oil pressure, and water temperature gauges 14) 3" downpipe, midpipe, and exhaust 15) New stage 1 clutch 16) Brand new tires 17) New tokico illumina adjustable shocks 18) New drilled & slotted brake rotors w/ organic brake pads 19) New optima battery relocated to the trunk w/ all new ground wires.
And im now thinking about swapping out the twin turbos for a greddy t-78, any recommendations on any more work i should do to the car before the swap?
also what kind of horsepower and boost do you think Ill be running with the 78
12-01-08, 07:54 AM
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I currently have this set up in my car and i think it is pretty much ready for the transfer.
1) Street ported w/ 3mm Apex Seals 2) Aereomotive fuel pressure regulator 3) 850 primary injectors & 1600 secondary injectors 4) Racing pulleys 5) 10 gauge spark plug cables 6 )3 row koyo radiator 7) Greddy front mount intercooler w/ greddy elbow 8) All brand new silicon vaccum & radiator hoses 9) New turbo filters 10) Manual boost controller 11) Boost is @ 13.5 pounds 12) Apexi ECU w/ display screen 13) Autometer boost, pyrometer, oil pressure, and water temperature gauges 14) 3" downpipe, midpipe, and exhaust 15) New stage 1 clutch 16) Brand new tires 17) New tokico illumina adjustable shocks 18) New drilled & slotted brake rotors w/ organic brake pads 19) New optima battery relocated to the trunk w/ all new ground wires.
And im now thinking about swapping out the twin turbos for a greddy t-78, any recommendations on any more work i should do to the car before the swap?
also what kind of horsepower and boost do you think Ill be running with the 78
1) Street ported w/ 3mm Apex Seals 2) Aereomotive fuel pressure regulator 3) 850 primary injectors & 1600 secondary injectors 4) Racing pulleys 5) 10 gauge spark plug cables 6 )3 row koyo radiator 7) Greddy front mount intercooler w/ greddy elbow 8) All brand new silicon vaccum & radiator hoses 9) New turbo filters 10) Manual boost controller 11) Boost is @ 13.5 pounds 12) Apexi ECU w/ display screen 13) Autometer boost, pyrometer, oil pressure, and water temperature gauges 14) 3" downpipe, midpipe, and exhaust 15) New stage 1 clutch 16) Brand new tires 17) New tokico illumina adjustable shocks 18) New drilled & slotted brake rotors w/ organic brake pads 19) New optima battery relocated to the trunk w/ all new ground wires.
And im now thinking about swapping out the twin turbos for a greddy t-78, any recommendations on any more work i should do to the car before the swap?
also what kind of horsepower and boost do you think Ill be running with the 78
from the sounds of this list, i would imagine you have one already, but figured id throw it up there to check.
12-01-08, 11:28 AM
#4
ok so you have the stock twins and you want to go single? If you are getting a kit it should come with a wastegate sized to whatever turbo you get. If you are wanting to buy the parts individually you will need the turbo, external wastegate, manifold, new intercooler piping on the turbo side, oil supply and return lines, block off plates, heavier clutch, new downpipe, and a good tuner. I also recommend the datalogit and a wideband o2 setup, and an electronic boost controller will give you better boost control and faster spool.
Now about the turbos you're asking about... not very good street turbos. You need to figure out what you want out of the car. Both those turbos will have alot of lag and they wont be efficient until around 20 psi. They will make a lot of power though (500+), but unless you plan on running race gas you'll need to run aux meth injection for a reliable setup. You'll also need a 3 bar map sensor if you plan to run over 17 psi.
If you are looking for a good street turbo with decent spool and 400-430 HP at a more reliable boost level (15psi) then look into a gt35, gt35/40, t60-1, t62-1, t64, t66 or anything similarly sized with a hotside a/r between .84-1.15. These turbos will be much better for a very fast street car and can still make even more power if you dump in some race fuel and turn the boost up a bit more. The Ball bearing turbos (gt35r to4z etc) will have faster spool but are more expensive.
Now about the turbos you're asking about... not very good street turbos. You need to figure out what you want out of the car. Both those turbos will have alot of lag and they wont be efficient until around 20 psi. They will make a lot of power though (500+), but unless you plan on running race gas you'll need to run aux meth injection for a reliable setup. You'll also need a 3 bar map sensor if you plan to run over 17 psi.
If you are looking for a good street turbo with decent spool and 400-430 HP at a more reliable boost level (15psi) then look into a gt35, gt35/40, t60-1, t62-1, t64, t66 or anything similarly sized with a hotside a/r between .84-1.15. These turbos will be much better for a very fast street car and can still make even more power if you dump in some race fuel and turn the boost up a bit more. The Ball bearing turbos (gt35r to4z etc) will have faster spool but are more expensive.
12-01-08, 12:14 PM
#6
Performance is relative to what you need the car to do.
All out drag car? a road coarse car? auto x? drift? street/strip car? An autobahn high speed highway car? a daily driver?
Is cost an issue? Is spool an issue? cause if you're going from sequential twins there will be a difference in how long you have to wait for your power. And the more power you want the longer in rpms you will have to wait, generally speaking. This is offset a bit with the dual ball bearing turbos, and different wheel combinations but its still how things work.
If maximum power is what you want and you dont mind waiting till 5000-6000rpms for full boost then maybe you want a really big turbo like the t78 or t88. They are older designs but more cost friendly for huge power goals.
If you dont mind spending a lot of money, want to reduce the spool some and still have the big numbers go with a gt40r. It's a newer design. Makes big numbers and has better spool then the t78-t88.
But you will still need to run the higher psi to really get the power out of any them. so if you are planning to run around 15 psi, which is about the limit for a conservative street setup without AI, then stick with the turbos i mentioned earlier.
In my opinion something like a gt35/40r would suit you well. They are more costly being dual BB, but they spool faster and are well matched for a 400+ hp street/track car. Full boost should be under 4000 with your street port and a good EBC. I'm running something similar to a t64 i get full boost around 4k, if cost wasnt an issue i would go with a BB turbo though.
Either A-spec, or jason at rx7store would probably be able to help you more on turbo selection then i can, but you first need to figure out exactly what you want, and realize there will always be some sort of sacrifice. Be it cost, spool, or power.
All out drag car? a road coarse car? auto x? drift? street/strip car? An autobahn high speed highway car? a daily driver?
Is cost an issue? Is spool an issue? cause if you're going from sequential twins there will be a difference in how long you have to wait for your power. And the more power you want the longer in rpms you will have to wait, generally speaking. This is offset a bit with the dual ball bearing turbos, and different wheel combinations but its still how things work.
If maximum power is what you want and you dont mind waiting till 5000-6000rpms for full boost then maybe you want a really big turbo like the t78 or t88. They are older designs but more cost friendly for huge power goals.
If you dont mind spending a lot of money, want to reduce the spool some and still have the big numbers go with a gt40r. It's a newer design. Makes big numbers and has better spool then the t78-t88.
But you will still need to run the higher psi to really get the power out of any them. so if you are planning to run around 15 psi, which is about the limit for a conservative street setup without AI, then stick with the turbos i mentioned earlier.
In my opinion something like a gt35/40r would suit you well. They are more costly being dual BB, but they spool faster and are well matched for a 400+ hp street/track car. Full boost should be under 4000 with your street port and a good EBC. I'm running something similar to a t64 i get full boost around 4k, if cost wasnt an issue i would go with a BB turbo though.
Either A-spec, or jason at rx7store would probably be able to help you more on turbo selection then i can, but you first need to figure out exactly what you want, and realize there will always be some sort of sacrifice. Be it cost, spool, or power.
Last edited by Dudemaaanownsanrx7; 12-01-08 at 12:21 PM.
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12-01-08, 01:18 PM
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okay, im starting to lean more towards the 35r and 40r, it is a weekend warrior and i do take it to the strip but i want the car to stay reliable. Currently the system is set up as a non-seqeuntial blow off so i think it would work well with the single. Only question is though with the setup i have now do i need to buy an entire kit for safety or can I work with what i have now and just buy the turbo
12-01-08, 01:30 PM
#9
no you cannot just buy the turbo. If you still have the stock twins all that has to go and be replaced with what i mentioned.
Also non sequential blow off means nothing to me... I'm guessing you're saying the turbo's are non sequential. Or you could be saying you have a non sequential blow off valve, but either way that makes no difference to anything. Buying an entire kit is not for safety it is so that it can actually be done. Because it is physically impossible to mount JUST a single turbo in place of the stock twin turbos. It's a totally different manifold,wastegate, downpipe and everything
Also the gt35r and gt40r are very different turbos in terms of size. the gt35/40r is what i was referring to which is a gt35 with the larger T4 hotside. It is very similar in size to a t60-1 except that its dual BB so it spools faster.
Also non sequential blow off means nothing to me... I'm guessing you're saying the turbo's are non sequential. Or you could be saying you have a non sequential blow off valve, but either way that makes no difference to anything. Buying an entire kit is not for safety it is so that it can actually be done. Because it is physically impossible to mount JUST a single turbo in place of the stock twin turbos. It's a totally different manifold,wastegate, downpipe and everything
Also the gt35r and gt40r are very different turbos in terms of size. the gt35/40r is what i was referring to which is a gt35 with the larger T4 hotside. It is very similar in size to a t60-1 except that its dual BB so it spools faster.
Last edited by Dudemaaanownsanrx7; 12-01-08 at 01:33 PM.
12-01-08, 03:10 PM
#10
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Seanbaby, you might want to spend some time in the single turbo archives, most of the questions you're asking have been asked many times before.....the t-78 and t-88 aren't exactly new turbos 
Also, check this page for lots of good info:
http://www.turbobygarrett.com/turbob...o_tech101.html
Also, check this page for lots of good info:
http://www.turbobygarrett.com/turbob...o_tech101.html
12-01-08, 04:48 PM
#12
I might be selling my T78 turbo, manifold and wastegate here soon. I put down 500rwp at 20psi on a halfbridge engine. I dont know what your goals are, but mine got me from A to B rather quickly. The T78 or T88 is an older Journal Bering turbo. They are not nearly as expensive as the upgraded Ball-Bering turbos, but do not hit full boost as quickly. I got full boost by 4700RPMs with my T78.
You are going to need a new manifold, wastegate, turbo, intercool piping(maybe) and a new downpipe. You will have to buy a "kit". Might also want to look at the 500r, I think GoodFella has one of those; but either way there is a TON of information on here and you just need to read them and see what kind of goals you want to set. If its a daily, I dont think I would even go single and more boost. If its a toy car like mine, boost the biach.
The T78 or T88 is an older Journal Bering turbo. They are not nearly as expensive as the upgraded Ball-Bering turbos, but do not hit full boost as quickly. I got full boost by 4700RPMs with my T78. You are going to need a new manifold, wastegate, turbo, intercool piping(maybe) and a new downpipe. You will have to buy a "kit". Might also want to look at the 500r, I think GoodFella has one of those; but either way there is a TON of information on here and you just need to read them and see what kind of goals you want to set. If its a daily, I dont think I would even go single and more boost. If its a toy car like mine, boost the biach.
12-01-08, 04:50 PM
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Yeah dude Rich is right^^^.You need to research and find what you're looking for your fd.I was over a year researching as to what I wanted in my fd.Everyone's needs are different.I drove my friends fd who had a garrett gt40 setup and was impressed with it but then I drove an fd with the garrett gt35r setup and wasn't impressed but that had alot to do with the way the car ran,probably wasn't the turbo's fault but the guy who owned the fd was a bit of a butcher so that kind of threw me off it.I then drove my mates fd with the apexi rx6 turbo and loved it!He's a proper rx7 tuner and has a 20b triple rotor,twin turbo fd and a spirit r so it has alot to do with the tuner.The car ran like a dream with the right amount of psi and spooled up qiute quickly.He was running as much as he could get out of it but it was also reliable aswell.Me and him tuned my fd.Anyways,back to mine.I went with the T78 turbo kit (Greddy t78 turbo,external wastegate,manifold,downpipe,filter,intercooler elbow pipe on the turbo side,oil lines and return lines and block off plates),exedy uprated clutch,boost controller (I went with the greddy profec II)uprated fuel pump.I also went with a street port and skimmed plates and a fresh rebuild with new housings to take them power.Dudemaaanownsanrx7 explained it all though.The turbo is laggy,it kicks in about 3700,3800 rpm but when it does hold on!I don't find the spool up too bad on it either.I thought it would be a lot worse but I got a good mapping on the power fc.All I can say is though,get a good tuner,someone who knows what theyre at and get onto jason rx7store.net or rich above (Goodfella) and ask them for some advice and tell them what you're after.Alot of guys on this forum know what they're talkin bout.Go with a brand name turbo,hks,greddy etc and have a large bank balance!!!!!!!!!!Enjoy!!!!!!!!!!!!!!
12-01-08, 05:37 PM
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thankyou for information it is very helpful, the more i look into this the more im thinking I want a GT40R, as much as the power of the T78 sounds intreaging, it also sounds like more work and higher maintenance. Quick spooling longer longevity of the engine at the sacrafice of 50 or so hp sounds okay to me
12-02-08, 07:11 PM
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t-78 is oldskool but proven..
I have the t-78 and im very happy with it
it kicks in quite quick (u get the turbo kicking in at ~4k revs)
if i was going to choose now i would have gone with a gt42r... a t6 dual ball bearing (correct me if its just ball bearing) . spool wise would be raughly the same but with a lot more power.
If you have ever driven an evo you ll realise (even with the oem turbo) that it doesnt kick in before the 3.5k revs. same with the mk3 supra, which is more laggy than the evo...
also consider the rebuilding if needed. Ball bearing turbos you cant rebuild. ONLY change the cartridge. How much does that cost?
I have the t-78 and im very happy with it
it kicks in quite quick (u get the turbo kicking in at ~4k revs)
if i was going to choose now i would have gone with a gt42r... a t6 dual ball bearing (correct me if its just ball bearing) . spool wise would be raughly the same but with a lot more power.
If you have ever driven an evo you ll realise (even with the oem turbo) that it doesnt kick in before the 3.5k revs. same with the mk3 supra, which is more laggy than the evo...
also consider the rebuilding if needed. Ball bearing turbos you cant rebuild. ONLY change the cartridge. How much does that cost?
Last edited by R-R-Rx7; 12-02-08 at 07:15 PM.
12-02-08, 09:14 PM
#17
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likewise i have the t78 and its very streetable, good fore gas mileage as it doesnt come on till when you actually need the turbo!
now my question is what is your power goals, Your going to need a good ignition system depending on your goals and depening on the horsepower you want you might have to open that motor again to do some work as well.
So my question is how much are you looking for
p.s. those injectors will give you 550-580 reasonably (i hit 82% at 572 with 850/1600)
now my question is what is your power goals, Your going to need a good ignition system depending on your goals and depening on the horsepower you want you might have to open that motor again to do some work as well.
So my question is how much are you looking for
p.s. those injectors will give you 550-580 reasonably (i hit 82% at 572 with 850/1600)
12-04-08, 06:46 PM
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Don't wanna get off the subject but i'm running 1600 secondarys and its idling a little funny.A little more tweaking at the weekend will prob sort it.My question is this though and nothing to do with the idling but should I invest in an hks twin power?Do you guys recommend it for ignition purposes?
12-04-08, 11:16 PM
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i run 850/1600, daily drive my car everywhere no idling problems. NOW!!!! his problem is getting a good tuner so that the car will idle properly
12-04-08, 11:46 PM
#22
dark phantom what afr do you idle at? just curious. also what EMS?
A couple months ago i had one of my 550's fail and i thought about swapping in my 850's but ended up picking up some used 550's for a good price instead. Part of the reason i didnt do the 850's is i was concerned about the idle being very rich, that and i didnt want to retune my whole map.
A couple months ago i had one of my 550's fail and i thought about swapping in my 850's but ended up picking up some used 550's for a good price instead. Part of the reason i didnt do the 850's is i was concerned about the idle being very rich, that and i didnt want to retune my whole map.
12-05-08, 05:35 PM
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dark phantom what afr do you idle at? just curious. also what EMS?
A couple months ago i had one of my 550's fail and i thought about swapping in my 850's but ended up picking up some used 550's for a good price instead. Part of the reason i didnt do the 850's is i was concerned about the idle being very rich, that and i didnt want to retune my whole map.
A couple months ago i had one of my 550's fail and i thought about swapping in my 850's but ended up picking up some used 550's for a good price instead. Part of the reason i didnt do the 850's is i was concerned about the idle being very rich, that and i didnt want to retune my whole map.
i have no problems starting up as it starts quickly. i had my mechanic tunned my car and i think he spent 40minutes getting the 850's to idle properly, its not hard but its time consuming. p.s. my name is one word