tte turbo boost

firepower · January 8, 2007, 22:44

can anyone shed any light on this

liz has had her car on the dyno to solve her drop off in power and torque and was told her boost was 10 psi and this could be causing her problem.

i had my car on the dyno a couple of months back and was told my boost was running at 5 psi s:? :? s:?

i thought that the tte turbo was set at 7 psi and could not be adjusted but it would appear that it can s:?: :?: s:?:

muffdan · January 8, 2007, 22:48

yeah, there's no boost controller so isn't the boost level locked to whatever PSI is needed to compress the mechanical spring on the waste gate? And of course this should be the same across all TTE kits.

Anonymous · January 8, 2007, 22:50

and wasnt ninjinski's running at 8psi because he had his SP downpipe?!

kanujunkie · January 8, 2007, 22:53

you'll get 8psi out a system set at 7psi due to boost creep, at the mo mines set at 5psi but i've seen it touch 7psi occasionally

firepower · January 8, 2007, 23:04

if it is set and not adjustable how did they reduce liz's from 10 psi to 8 psi to solve her power and torque drop off problem

Anonymous · January 8, 2007, 23:07

i would have thought its adjustable its just that the TTE piggy back is set up for the car to be run on 7psi

firepower · January 8, 2007, 23:15

if that is the case how come my boost was set at 5 psi and liz's was set at 10 psi surely it should have been set at the optimum pressure for the turbo kit .

what psi are you running s:?: :?: s:?:

Liz · January 8, 2007, 23:16

Quote from: "firepower"if it is set and not adjustable how did they reduce liz's from 10 psi to 8 psi to solve her power and torque drop off problem

He turned a metal bar which is just underneath the turbo - I don't know what its called!

Anonymous · January 8, 2007, 23:21

maybe this is an issue you need to bring up with SP then and see why your cars are running different psi

as far as im aware im running 7psi , just like when i had it done but it wud be interesting to see if it is still running at that

kanujunkie · January 8, 2007, 23:21

the piggy back unit is the map, i.e. the fuelling, it doesn't affect the pressure of the turbo, the turbo output sense line and actuator and wastegate are the only items that can affect pressure. As far as i can see from the installation manual, the only adjustment on that is the wastegate actuator arm which is length adjustable.

Anonymous · January 8, 2007, 23:22

Quote from: "Liz"
Quote from: "firepower"if it is set and not adjustable how did they reduce liz's from 10 psi to 8 psi to solve her power and torque drop off problem

He turned a metal bar which is just underneath the turbo - I don't know what its called!

ia that the actuator?

stab in the dark

firepower · January 8, 2007, 23:23

another thought we now believe that the psi is adjustable but the max psi you can run and still keep within the toyota warranty is 7 psi.

i assume that the turbo kit is supplied with the pressure already set and so when it is fitted the only way to check what pressure it is running is to put it on a dyno

Anonymous · January 8, 2007, 23:27

could that explain why your power is a bit down firepower cus at time of dyno you were on 5psi

firepower · January 8, 2007, 23:31

yes i would think so

they said at the time of the dyno run the car was running low boost

Anonymous · January 8, 2007, 23:34

now i bet you just carnt wait to get your new exhaust and another dyno done?!

kanujunkie · January 8, 2007, 23:35

Quote from: "bossman23780"
Quote from: "Liz"
Quote from: "firepower"if it is set and not adjustable how did they reduce liz's from 10 psi to 8 psi to solve her power and torque drop off problem

He turned a metal bar which is just underneath the turbo - I don't know what its called!

ia that the actuator?

stab in the dark

thats the actuator arm length adjuster that i'm talking about, have a look at page 9 of the install manual

spit · January 8, 2007, 23:37

From the TTET install manual it looks like the actuator arm is two-piece and can be screwed/unscrewed to alter its length. This won't change the pressure at which the wastegate actuator moves, but I'm thinking you can adjust the arm to make sure the wastegate is firmly shut under resting condition and not creeping a bit.

firepower · January 8, 2007, 23:38

you got it in one mate s:lol: :lol: s:lol: im chomping at the bit when i get it dynoed i may see if they can adjust the psi

Anonymous · January 8, 2007, 23:42

s8)

s8) were you getting the downpipe aswell

firepower · January 8, 2007, 23:44

yes s:lol: :lol: s:lol:

Liz · January 8, 2007, 23:46

Well he managed to adjust the PSI on mine by twiddling with the actuator arm length.

Anonymous · January 8, 2007, 23:46

im very jealous now!!!!! s:lol: :lol: s:lol:

spit · January 8, 2007, 23:46

I've got a manual TIM gauge you're welcome to slap on for reference if you like.

Also have to consider that, although it was perishing cold at your dyno Phil, the conditions weren't as favourable to the boost brigade as they were at Silverstone. Now that we have the dyno plots from both Chris can do the correction for you based on the calibration numbers along the bottom.

Correction factor to get from wheel to fly at Silverstone was 12%. Not sure what Chris used at H'Sports - did anyone ask?

kanujunkie · January 8, 2007, 23:47

but its the difference between shut and shut a bit more tightly, either way its still shut

what if the wastegate was allowed to leak slightly? and by that i mean all the time, the output px would have to rise slightly higher to maintain the initial pressure

spit · January 8, 2007, 23:51

Quote from: "Liz"Well he managed to adjust the PSI on mine by twiddling with the actuator arm length.

Entirely feasible. I'm guessing your actuator arm was holding the wastegate very tight shut before they backed it off a bit.

Interestingly (for some!), Gas alters the stock lever length on the C2's Garrett wastegate to make it open at a different speed.