Does anyone know how much boost (MAXIMUM) a non-modified CT26 turbo can handle???
I drive a Celica. Anything "less" is just a car!
I drive a Celica. Anything "less" is just a car!
CT26 + Maximum Boost - 6G Celicas Forums
I drive a Celica. Anything "less" is just a car!
People say it dies out after 15psi.
I will return one day.
eh, I have heard it craps out at around 10psi, but I dont know for sure, if you want a turbo look into ct20b's, less lag, and can push more boost.
>
oh heck no... def. can go more than just 10psi (and believe me it PULLS hard all the way to 14psi... from my own experience of course
yah ive heard people say it can go all the way up to 19psi but 15-16psi is basically the "understood" max for a stock ct26
bboy
This post has been edited by BBoYRuGGeD: Jan 30, 2006 - 12:30 AM
QUOTE(creis @ Jan 30, 2006 - 5:25 AM) [snapback]386322[/snapback]
>
eh, I have heard it craps out at around 10psi, but I dont know for sure, if you want a turbo look into ct20b's, less lag, and can push more boost.
eh, I have heard it craps out at around 10psi, but I dont know for sure, if you want a turbo look into ct20b's, less lag, and can push more boost.
oh heck no... def. can go more than just 10psi (and believe me it PULLS hard all the way to 14psi... from my own experience of course
yah ive heard people say it can go all the way up to 19psi but 15-16psi is basically the "understood" max for a stock ct26
bboy
This post has been edited by BBoYRuGGeD: Jan 30, 2006 - 12:30 AM
..(formerly daily driven) 3S-GTE powered celica currently set @ 12psi..
>
lol... who told you that? 13-15psi is where the turbo comes alive. as far as lag, im pretty sure the ct26 and the ct20 spool just as quickly. the only diffence is that the ct20 makes more power per pound and you can safely run it at aroud 17psi or sometimes a little more.
i never run my ct26 over 15psi.
This post has been edited by lagos: Jan 30, 2006 - 1:13 AM
QUOTE(creis @ Jan 30, 2006 - 12:25 AM) [snapback]386322[/snapback]
>
eh, I have heard it craps out at around 10psi, but I dont know for sure, if you want a turbo look into ct20b's, less lag, and can push more boost.
eh, I have heard it craps out at around 10psi, but I dont know for sure, if you want a turbo look into ct20b's, less lag, and can push more boost.
lol... who told you that? 13-15psi is where the turbo comes alive. as far as lag, im pretty sure the ct26 and the ct20 spool just as quickly. the only diffence is that the ct20 makes more power per pound and you can safely run it at aroud 17psi or sometimes a little more.
i never run my ct26 over 15psi.
This post has been edited by lagos: Jan 30, 2006 - 1:13 AM
15PSI - 30MPG - Megasquirt Tuned
>
This is a myth. It just becomes more inefficient and more dangerous - especially without good intercooling.
QUOTE(defgeph @ Jan 29, 2006 - 1:07 PM) [snapback]386073[/snapback]
>
People say it dies out after 15psi.
People say it dies out after 15psi.
This is a myth. It just becomes more inefficient and more dangerous - especially without good intercooling.
QUOTE(lagos @ Jul 10, 2006 - 1:55 PM) [snapback]454118[/snapback]i know your trying to do the right thing for your motor, but this is one of those times where you should just trust the guys who have had their swaps for a while and have done a ton of research into this.
Yeah, I'm with you on the myth part. I've run the ct26 @ 18 psi, and the car pulled harder. But maybe that has something to do with my intercooler. I dont feel safe with 18psi on the 26.
For right now, I still think the safe limit for the 26 is @ 15psi.
For right now, I still think the safe limit for the 26 is @ 15psi.
I will return one day.
Won't die, just runs out of breath. 
Daily driver, CT20b is currently doing about 20psi.
click me - Defi boost gauge replay
(1 bar = 14psi)
Daily driver, CT20b is currently doing about 20psi.
click me - Defi boost gauge replay
(1 bar = 14psi)
www.tangcla.com- photographyCanon EOS 5D Mark II | EOS 1D Mark II N | 16-35mm f/2.8L|24-70mm f/2.8L| 70-200mm f/2.8LIS15mm f/2.8 fisheye | 85mm f/1.8 | 100mm f/2.8 macro | 580EX-II x2
I'm afraid of going above 15...
MyFlickrMyeBay_Perpetual Aperture_
this might be kinda funny but i hit 20 once day on accident. i dunno what happened but it blew my motor a few days later haha. i'm guessing i blew a hose prob on the actuator or something... but that was once sweet experience that i will never forget.
>
I had one of those too.. quite scary. And since I have a different ECU, no fuelcut... 28psi+ is scary!!!
QUOTE(rjbibeau @ Feb 4, 2006 - 2:46 AM) [snapback]388513[/snapback]
>
this might be kinda funny but i hit 20 once day on accident. i dunno what happened but it blew my motor a few days later haha. i'm guessing i blew a hose prob on the actuator or something... but that was once sweet experience that i will never forget.
this might be kinda funny but i hit 20 once day on accident. i dunno what happened but it blew my motor a few days later haha. i'm guessing i blew a hose prob on the actuator or something... but that was once sweet experience that i will never forget.
I had one of those too.. quite scary. And since I have a different ECU, no fuelcut... 28psi+ is scary!!!
www.tangcla.com- photographyCanon EOS 5D Mark II | EOS 1D Mark II N | 16-35mm f/2.8L|24-70mm f/2.8L| 70-200mm f/2.8LIS15mm f/2.8 fisheye | 85mm f/1.8 | 100mm f/2.8 macro | 580EX-II x2
Anything above 1.2bar and it will lose effeciency and just blow very hot air into your engine, you can run 1.3bar with WI but thats about your limit.
>
oh hey Nial! Fancy meeting you here
QUOTE(Insanity-74 @ Feb 4, 2006 - 9:21 AM) [snapback]388638[/snapback]
>
Anything above 1.2bar and it will lose effeciency and just blow very hot air into your engine, you can run 1.3bar with WI but thats about your limit.
Anything above 1.2bar and it will lose effeciency and just blow very hot air into your engine, you can run 1.3bar with WI but thats about your limit.
oh hey Nial! Fancy meeting you here
www.tangcla.com- photographyCanon EOS 5D Mark II | EOS 1D Mark II N | 16-35mm f/2.8L|24-70mm f/2.8L| 70-200mm f/2.8LIS15mm f/2.8 fisheye | 85mm f/1.8 | 100mm f/2.8 macro | 580EX-II x2
>
The CT20B has a better powerband. The CT26 just kind of "dies out" around 5200rpm, while the CT20B keeps pulling till redline.
-Josh
QUOTE(lagos @ Jan 30, 2006 - 1:11 AM) [snapback]386350[/snapback]
>
the only diffence is that the ct20 makes more power per pound and you can safely run it at aroud 17psi or sometimes a little more.
the only diffence is that the ct20 makes more power per pound and you can safely run it at aroud 17psi or sometimes a little more.
The CT20B has a better powerband. The CT26 just kind of "dies out" around 5200rpm, while the CT20B keeps pulling till redline.
-Josh
sorta off topic but since we're talking about boost limit i just wunna ask if anyone knows the injectors duty cycle at 10psi? reason i ask is cuz over at the alltrac forums ive read on a recent topic that at 10psi the injectors are at 100% duty cycle which is bad (over a long period of time). can anyone confirm this? i tried looking at mr2oc and didnt really come across what i wanted to know.
even if it was at 100% at 10psi, alot of mr2t/alltrac owners have been boosting as high as 15 without prob over the years so i dont think this should be a prob...but im just curious
bboy
even if it was at 100% at 10psi, alot of mr2t/alltrac owners have been boosting as high as 15 without prob over the years so i dont think this should be a prob...but im just curious
bboy
..(formerly daily driven) 3S-GTE powered celica currently set @ 12psi..
>
You will need to upgrade your fuel rail to safely run over 10psi - 12psi. ATS sells a bored out stock version for 75 bucks. The stock fuel rail starts to restrict the fuel after a certain PSI of boost.
You are correct running over 10 PSI for a long period of time will cause major damage.
QUOTE(BBoYRuGGeD @ Feb 3, 2006 - 9:34 PM) [snapback]388708[/snapback]
>
sorta off topic but since we're talking about boost limit i just wunna ask if anyone knows the injectors duty cycle at 10psi? reason i ask is cuz over at the alltrac forums ive read on a recent topic that at 10psi the injectors are at 100% duty cycle which is bad (over a long period of time). can anyone confirm this? i tried looking at mr2oc and didnt really come across what i wanted to know.
even if it was at 100% at 10psi, alot of mr2t/alltrac owners have been boosting as high as 15 without prob over the years so i dont think this should be a prob...but im just curious
bboy
sorta off topic but since we're talking about boost limit i just wunna ask if anyone knows the injectors duty cycle at 10psi? reason i ask is cuz over at the alltrac forums ive read on a recent topic that at 10psi the injectors are at 100% duty cycle which is bad (over a long period of time). can anyone confirm this? i tried looking at mr2oc and didnt really come across what i wanted to know.
even if it was at 100% at 10psi, alot of mr2t/alltrac owners have been boosting as high as 15 without prob over the years so i dont think this should be a prob...but im just curious
bboy
You will need to upgrade your fuel rail to safely run over 10psi - 12psi. ATS sells a bored out stock version for 75 bucks. The stock fuel rail starts to restrict the fuel after a certain PSI of boost.
You are correct running over 10 PSI for a long period of time will cause major damage.
I will return one day.
thnx for confirming for me jeff ... anyway i think ill still set my boost at 12 maybe 14 after i make an fcd since i only hit full boost once in awhile when situation calls for it
bboy
bboy
..(formerly daily driven) 3S-GTE powered celica currently set @ 12psi..
>
i dont know if i agree with that. lots of mr2oc guys report running 15psi for a few years with no problems.
most of the stuff i hear says that as long as you stay with the ct26, you shouldnt need any fuel upgrades.
This post has been edited by lagos: Feb 4, 2006 - 1:53 AM
QUOTE
>You are correct running over 10 PSI for a long period of time will cause major damage.
i dont know if i agree with that. lots of mr2oc guys report running 15psi for a few years with no problems.
most of the stuff i hear says that as long as you stay with the ct26, you shouldnt need any fuel upgrades.
This post has been edited by lagos: Feb 4, 2006 - 1:53 AM
15PSI - 30MPG - Megasquirt Tuned
Its better to be safe than sorry right ? 75 bucks for an upgraded rail is better than rebuilding and entire engine.
Flowbenchs have proved that the stock fuel rail leans out piston number one.
After a certain amount of turbo pressure.
Flowbenchs have proved that the stock fuel rail leans out piston number one.
After a certain amount of turbo pressure.
I will return one day.
>
wow 75 bucks? i gutta check ATS's website out.
do u know at what psi does the stock rail lean number 1 at?
bboy
QUOTE(defgeph @ Feb 4, 2006 - 7:04 AM) [snapback]388792[/snapback]
>
Its better to be safe than sorry right ? 75 bucks for an upgraded rail is better than rebuilding and entire engine.
Flowbenchs have proved that the stock fuel rail leans out piston number one.
After a certain amount of turbo pressure.
Its better to be safe than sorry right ? 75 bucks for an upgraded rail is better than rebuilding and entire engine.
Flowbenchs have proved that the stock fuel rail leans out piston number one.
After a certain amount of turbo pressure.
wow 75 bucks? i gutta check ATS's website out.
do u know at what psi does the stock rail lean number 1 at?
bboy
..(formerly daily driven) 3S-GTE powered celica currently set @ 12psi..
>
yeah i remember reading some stuff on that, but i always thought it was only an issue once you start to uprade past the stock injectors.
QUOTE(defgeph @ Feb 4, 2006 - 2:04 AM) [snapback]388792[/snapback]
>
Its better to be safe than sorry right ? 75 bucks for an upgraded rail is better than rebuilding and entire engine.
Flowbenchs have proved that the stock fuel rail leans out piston number one.
After a certain amount of turbo pressure.
Its better to be safe than sorry right ? 75 bucks for an upgraded rail is better than rebuilding and entire engine.
Flowbenchs have proved that the stock fuel rail leans out piston number one.
After a certain amount of turbo pressure.
yeah i remember reading some stuff on that, but i always thought it was only an issue once you start to uprade past the stock injectors.
15PSI - 30MPG - Megasquirt Tuned
the deal is this: with an upgraded fuel pump (like all of us swappers run)
there is a pressure drop across the rail of 14-17psi at the #4 injector VS the #1 injector.
basicly it is because of how small the hole is that provides the fuel across the rail to the injectors.
you can read all about it here:
http://www.mr2oc.com/showthread.php?t=60913
the highlights:
⢠One should NOT run a larger fuel pump with the stock Gen II MR2 Turbo (3S-GTE) fuel rail.
⢠One should NOT run any fuel rail with 550âs with the stock Gen II 3S-GTE fuel pump above 10 PSI boost. The stock fuel pump cannot keep up above 52 psi of line pressure. Even though the test data shows a 60 psi test was run, when the injectors opened in this test, the pressure dropped to 50 psi!!
⢠The Gen II 3S-GTE factory FPR, supply lines, and return lines can handle a larger fuel pump without problems.
⢠Both the supra pump and the Walbro pump (255 lph) can keep up with 850 cc/min injectors.
there is a pressure drop across the rail of 14-17psi at the #4 injector VS the #1 injector.
basicly it is because of how small the hole is that provides the fuel across the rail to the injectors.
you can read all about it here:
http://www.mr2oc.com/showthread.php?t=60913
the highlights:
⢠One should NOT run a larger fuel pump with the stock Gen II MR2 Turbo (3S-GTE) fuel rail.
⢠One should NOT run any fuel rail with 550âs with the stock Gen II 3S-GTE fuel pump above 10 PSI boost. The stock fuel pump cannot keep up above 52 psi of line pressure. Even though the test data shows a 60 psi test was run, when the injectors opened in this test, the pressure dropped to 50 psi!!
⢠The Gen II 3S-GTE factory FPR, supply lines, and return lines can handle a larger fuel pump without problems.
⢠Both the supra pump and the Walbro pump (255 lph) can keep up with 850 cc/min injectors.
Former Team 5SFTE pro member ;)13.6@108MPH, 5SFTE Powered
>
Anytime the fuel pump is upgraded on a GenII 3sgte and new rail is a must. Otherwise over time, the engine will fail. Once the fuel rail is upgraded, you can safely run larger injectors or larger pumps.
That thread Manny just posted has excellent information. Nice find.
QUOTE
>yeah i remember reading some stuff on that, but i always thought it was only an issue once you start to uprade past the stock injectors.
Anytime the fuel pump is upgraded on a GenII 3sgte and new rail is a must. Otherwise over time, the engine will fail. Once the fuel rail is upgraded, you can safely run larger injectors or larger pumps.
That thread Manny just posted has excellent information. Nice find.
I will return one day.
I think i should upgrade my rail now...anyone have any opinions of the ATS rail here?
ok so an upgraded fuel rail is a must with an upgraded fuel pump (us swappers have already)...but is this at a certain boost? like manny said...at 14-17 psi theres a drop in pressure at #4 vs #1...so people should still be safe below those boost levels correct?
so far at 10psi the duty cycle of the injectors is 100% and at 14+psi the rail will need to be upgrade because us swappers already have upgraded pumps...correct me if im wrong. theres some great info here!
thnx manny that link was real informative
bboy
This post has been edited by BBoYRuGGeD: Feb 4, 2006 - 12:34 PM
ok so an upgraded fuel rail is a must with an upgraded fuel pump (us swappers have already)...but is this at a certain boost? like manny said...at 14-17 psi theres a drop in pressure at #4 vs #1...so people should still be safe below those boost levels correct?
so far at 10psi the duty cycle of the injectors is 100% and at 14+psi the rail will need to be upgrade because us swappers already have upgraded pumps...correct me if im wrong. theres some great info here!
thnx manny that link was real informative
bboy
This post has been edited by BBoYRuGGeD: Feb 4, 2006 - 12:34 PM
..(formerly daily driven) 3S-GTE powered celica currently set @ 12psi..
Why chance it?, the rail is only 75 bucks. Think about everytime you slighty over boost to 11psi ur leaning out #1. Another note, you have a manual boost gauge. you could have a wrong boost reading. you could be boosting @ 12psi and not even know it.
And EBC with a boost gauge built in is a great investment.
And EBC with a boost gauge built in is a great investment.
I will return one day.
ok so the RAIL will lean out #4 at 10psi? i thought it was 14-17psi from what manny said?
because of this topic...i will be upgrading rail sooner or later
and what about the 100% duty cycle of the injectors at 10psi...anyway of getting around this? new injectors or is this ecu controlled?
bboy
because of this topic...i will be upgrading rail sooner or later
and what about the 100% duty cycle of the injectors at 10psi...anyway of getting around this? new injectors or is this ecu controlled?
bboy
..(formerly daily driven) 3S-GTE powered celica currently set @ 12psi..
From what I have seen the stock injectors are fine for the CT26. The weak point in the fuel system is the rail.
Once replaced I think everything will work fine up to 15 psi.
Once replaced I think everything will work fine up to 15 psi.
I will return one day.
>
i didnt mean boost level, i meant a 14-17psi FUEL pressure drop across the rail.
ALL the time, at ANY boost level.
QUOTE(BBoYRuGGeD @ Feb 4, 2006 - 1:11 PM) [snapback]388887[/snapback]
>
ok so the RAIL will lean out #4 at 10psi? i thought it was 14-17psi from what manny said?
because of this topic...i will be upgrading rail sooner or later
and what about the 100% duty cycle of the injectors at 10psi...anyway of getting around this? new injectors or is this ecu controlled?
bboy
ok so the RAIL will lean out #4 at 10psi? i thought it was 14-17psi from what manny said?
because of this topic...i will be upgrading rail sooner or later
and what about the 100% duty cycle of the injectors at 10psi...anyway of getting around this? new injectors or is this ecu controlled?
bboy
i didnt mean boost level, i meant a 14-17psi FUEL pressure drop across the rail.
ALL the time, at ANY boost level.
Former Team 5SFTE pro member ;)13.6@108MPH, 5SFTE Powered
Does the fuel rail need to be upgraded with an ST205?
www.tangcla.com- photographyCanon EOS 5D Mark II | EOS 1D Mark II N | 16-35mm f/2.8L|24-70mm f/2.8L| 70-200mm f/2.8LIS15mm f/2.8 fisheye | 85mm f/1.8 | 100mm f/2.8 macro | 580EX-II x2
>
i dont believe any of the testing they did included the 3rd gen. so i cant really say for sure.
although with the stock 550s and bigger pump, i dont think there is an immediate cause for concern
QUOTE(tangcla @ Feb 4, 2006 - 5:07 PM) [snapback]388938[/snapback]
>
Does the fuel rail need to be upgraded with an ST205?
Does the fuel rail need to be upgraded with an ST205?
i dont believe any of the testing they did included the 3rd gen. so i cant really say for sure.
although with the stock 550s and bigger pump, i dont think there is an immediate cause for concern
Former Team 5SFTE pro member ;)13.6@108MPH, 5SFTE Powered