The most boost run

wotugonado · May 10, 2016, 17:42

As above what's the most boost anyone has safely run on a standard tte turbo and stock engine ?

1979scotte · May 10, 2016, 18:16

My SP hits 11psi sometimes.

wotugonado · May 10, 2016, 18:28

Is that on stock engine ?

1979scotte · May 10, 2016, 19:23

Yep apart from injectors

s12vea · May 10, 2016, 19:54

On our tte turbo you wouldn't want to run any more boost as the limiting factor would be the fueling as the standard injectors are pretty much maxed. I remember an old thread where someone added a boost controller to the standard set up and ran 10/12 psi but sure how successful that was.

keep meaning to add a boost gauge to mine to see that it's running.

s12vea · May 10, 2016, 19:55

As Scott said 10/11 psi prob max for stock internals but a good quality map would be the key.

wotugonado · May 10, 2016, 20:23

Well I fitted the next size up of spring in the actuator after the mot today and the boost is holding around 9 but spiking occasionally to 12/13 psi, don't want to do any damage now it's running ok

1979scotte · May 10, 2016, 20:31

13 would worry me.
Is it middle of the rev range?
Mine tails off at the higher rpm.

s12vea · May 10, 2016, 20:33

Quote from: "wotugonado"Well I fitted the next size up of spring in the actuator after the mot today and the boost is holding around 9 but spiking occasionally to 12/13 psi, don't want to do any damage now it's running ok

Does it feel much quicker?

wotugonado · May 10, 2016, 21:29

Yeah it worried me s:shock: :shock: s:shock: hence the question.
Hard to say regards the faster question I haven't driven it for about 5 weeks and everything feels fast compared to the work van. It pulled harder through all the gears compared to what i remembered but when it spiked id back off.

Mark A · May 10, 2016, 21:52

Turn it up to the max and hang on!

Until it goes pop.

Alex Knight · May 11, 2016, 06:58

Quote from: "wotugonado"As above what's the most boost anyone has safely run on a standard tte turbo and stock engine ?

Totally depends on turbo spec.

This is an expansive question.

Anonymous · May 11, 2016, 07:36

Quote from: "Alex Knight"
Quote from: "wotugonado"As above what's the most boost anyone has safely run on a standard tte turbo and stock engine ?

Totally depends on turbo spec.

.

+1 cfm of the turbo is the big aspect to look at.

However as a rule of 10psi on a gt28 with intercooler and 440cc injectors or about 6psi without intercooler and injectors.

On a gt25 10psi is the norm and don't need increased fuelling.

As for your situation get yourself an afr gauge, as long as your not going to lean when the boost spikes to 12 then it will be fine.

shnazzle · May 11, 2016, 10:02

Would it be easiest to wire both O2 sensors into one and use the other bung for a wideband? Or weld a new bung into the exhaust pre-cat?
As for boost gauge, how have you plumbed it in? Helen definitely wants one but where's the cleanest part to measure? I would T off the PCV

Still get a decent amount of boost cut, so keen on knowing what kind of pressure it's seeing

wotugonado · May 11, 2016, 11:20

Matt performance plumbed mine in, there's a line under the passenger rear compartment bin by the ECU and he just tee'd off that. I've looked at an AFR and reckon welding a bung in is the best, they do a kit which doesn't need welding its strapped around the hole in the pipe and must cure on once it gets hot. Also you will need the kit with the longer gauge wires because our engines are in the right place s8)

s8)

1979scotte · May 11, 2016, 11:21

I think the point here is that it is over what toyota specified for the TTE turbo.
Something is not right.

wotugonado · May 11, 2016, 11:23

Just a thought, could the AFR go in the post cat sensor bung as mines has the resistor fix it's obsolete. Or is that to far away for a clean read ?

wotugonado · May 11, 2016, 11:26

Quote from: "1979scotte"I think the point here is that it is over what toyota specified for the TTE turbo.
Something is not right.

It's the new spring it's a higher psi rating, but as the lower spring wasn't getting any where near the stated boost levels I thought I d give it a try and it's better until it spikes.

shnazzle · May 11, 2016, 11:35

Quote from: "wotugonado"Just a thought, could the AFR go in the post cat sensor bung as mines has the resistor fix it's obsolete. Or is that to far away for a clean read ?

Cat would foul the readings by changing o2 values

wotugonado · May 11, 2016, 11:39

There's that idea done and dusted then s:)

s:)

Anonymous · May 11, 2016, 11:48

How much to low was the old spring?

wotugonado · May 11, 2016, 12:18

Quote from: "rbuckingham"How much to low was the old spring?

It was the green spring the rating was ideal new but lately was registering sometimes 2 or 3 psi minimum but was averaging around 5

1979scotte · May 11, 2016, 12:54

Quote from: "wotugonado"
Quote from: "1979scotte"I think the point here is that it is over what toyota specified for the TTE turbo.
Something is not right.
It's the new spring it's a higher psi rating, but as the lower spring wasn't getting any where near the stated boost levels I thought I d give it a try and it's better until it spikes.

What about adjusting the arm?
Was the previous spring quite old?
Theyre less than £15 each which is probably a rip off.

Anonymous · May 11, 2016, 13:12

Same idea Scott. Shorten the arm slightly it will increase the opening psi by a couple.

wotugonado · May 11, 2016, 15:44

Quote from: "1979scotte"What about adjusting the arm?
Was the previous spring quite old?
Theyre less than £15 each which is probably a rip off.

I could try to slacken the arm up a little.
No spring was supplied with the actuator so 12 months old. I've got the 2 lowest rated springs, next one is 15 + psi so no good for me.