ct 26, whats the stock psi for a ct26 Options

[jcaron9gt4]

hey guys...i was just wondering what the stock psi is set at for a ct26...ive heard its at 7, but then ive also read somewhere that its in the 5psi range. does anyone know for sure?

[shin]

the stock wastegate is set at 7

This post has been edited by shin: Apr 4, 2007 - 10:18 AM

[jcaron9gt4]

thanks alot

[alltracman78]

On the Celica/MR2 it's ~ 8PSI [sometimes a bit more]. 7 Is actually a bit low.

For the Supra it's ~ 5-6 PSI.

[Supersprynt]

Also depends on your sea level. Mine was 8-8.5.

[6strngs]

so, does this mean that if you put a CT-26 on a 5sfte set-up (the turbo will be coming from a mr2 or alltrac) and don't use any kind of boost controller that you'll boost 7-8 PSI?

[Supersprynt]

No. Other variables control boost also, like exhaust for instance.

This post has been edited by Supersprynt: Apr 4, 2007 - 9:26 PM

[bufferdan]

Depends... my stock 93 mr2 ran 12psi stock....put a full exhaust on it and it will get up to 16psi in 4th-5th gear

This post has been edited by bufferdan: Apr 5, 2007 - 12:07 PM

[lagos]

Depends... my stock 93 mr2 ran 12psi stock....put a full exhaust on it and it will get up to 16psi in 4th-5th gear

ct26 waste gate spring is set to 7psi.
on the 3sgte normal boost is around 10psi, because of the factory boost control (tvsv).

but if you get a bigger exhaust, youll have a harder time keep the boost that low.

[6strngs]

so, if I use a boost controller will I be able to keep my boost lower than just depending on the stock wastegate?

honestly, I wouldn't mind boost 10-11 PSI, I just don't know how much my motor will be able to take and I want to take it as easy as possible on it for the first few weeks.

[Cisco93lude]

so, if I use a boost controller will I be able to keep my boost lower than just depending on the stock wastegate?

honestly, I wouldn't mind boost 10-11 PSI, I just don't know how much my motor will be able to take and I want to take it as easy as possible on it for the first few weeks.

u cannot lower stock wastegate psi with a mbc. u can only raise it. to lower stock psi you would have to run an external wastegate and that can get pricey.

[toyotacrazy]

so, if I use a boost controller will I be able to keep my boost lower than just depending on the stock wastegate?

honestly, I wouldn't mind boost 10-11 PSI, I just don't know how much my motor will be able to take and I want to take it as easy as possible on it for the first few weeks.

If you got a mbc that works well, You could keep it at 5 psi. Thats very safe for that engine. 5 psi is how high it will boost when cold or when it sences a problem

[presure2]

so, if I use a boost controller will I be able to keep my boost lower than just depending on the stock wastegate?

honestly, I wouldn't mind boost 10-11 PSI, I just don't know how much my motor will be able to take and I want to take it as easy as possible on it for the first few weeks.

If you got a mbc that works well, You could keep it at 5 psi. Thats very safe for that engine. 5 psi is how high it will boost when cold or when it sences a problem

this is NOT true.
guys, this is simple.
the wastegate on the ct-26 opens @ ~7-8psi.
with a free fowing exhaust, it will creep.
a boost controller will only allow you to RAISE, not lower boost.

[alltracman78]

Exactly

And the TVSV can only raise boost from what the WG is set at.
It can't lower it.

[toyotacrazy]

Exactly

And the TVSV can only raise boost from what the WG is set at.
It can't lower it.

sorry,
I havent experimented with my mbc since it doesnt currently work. Ok, so if you use the tvsv and either turn it on or off, manually, then you would stay at 5 psi.

[6strngs]

ok. I think I understand now. and I think I can scratch the MBC off the list of things I need for my 5sfte. at least for the time being.

[alltracman78]

Exactly

And the TVSV can only raise boost from what the WG is set at.
It can't lower it.

sorry,
I havent experimented with my mbc since it doesnt currently work. Ok, so if you use the tvsv and either turn it on or off, manually, then you would stay at 5 psi.

If your WG actuator is set for 8 PSI, you can't go below that, period.

[toyotacrazy]

Exactly

And the TVSV can only raise boost from what the WG is set at.
It can't lower it.

sorry,
I havent experimented with my mbc since it doesnt currently work. Ok, so if you use the tvsv and either turn it on or off, manually, then you would stay at 5 psi.

If your WG actuator is set for 8 PSI, you can't go below that, period.

You CAN boost below 8 psi. when the tvis is activated it wont allow the car to boost past 5 psi. This is called SAFE mode. As ive heard it called. When the engine detects knock or cold temperature of the coolant temp.

[x_itchy_b_x]

Exactly

And the TVSV can only raise boost from what the WG is set at.
It can't lower it.

sorry,
I havent experimented with my mbc since it doesnt currently work. Ok, so if you use the tvsv and either turn it on or off, manually, then you would stay at 5 psi.

If your WG actuator is set for 8 PSI, you can't go below that, period.

You CAN boost below 8 psi. when the tvis is activated it wont allow the car to boost past 5 psi. This is called SAFE mode. As ive heard it called. When the engine detects knock or cold temperature of the coolant temp.

Your a little confused. its ok though. OK whatever the WG is set to is the lowest possible boost you can run.
when "safe mode" activates it turns off the stock boost controller TVSV and you run W/e the WG spring is.
when "safe mode" isn't on, normal driving conditions it bleeds off air so the actuator opens later, thus upping boost.
i suck at explaining things.

[presure2]

Exactly

And the TVSV can only raise boost from what the WG is set at.
It can't lower it.

sorry,
I havent experimented with my mbc since it doesnt currently work. Ok, so if you use the tvsv and either turn it on or off, manually, then you would stay at 5 psi.

If your WG actuator is set for 8 PSI, you can't go below that, period.
to reitterate what ive been saying all along, the STOCK WASTEGATE SETTING IS ~7-8PSI

You CAN boost below 8 psi. when the tvis is activated it wont allow the car to boost past 5 psi. This is called SAFE mode. As ive heard it called. When the engine detects knock or cold temperature of the coolant temp.

trust me, jermey will know how the ct-26 actuator works better than you, hes a toyota tech. lol
besides the fact that he has one TATTOOED onto his arm!!
you have the right idea, just the wrong numbers.
on a 3sgte, in "safe mode" IS 7-8psi. when the TVSV energizes, it goes up to ~10-11.8psi.