68 replies to this topic

[CHILL Gone DUTCH]

Set it so it's just closed when off the car

[vadonchez]

sorry but i don't undersdtand your answer.

 

Do you agree that the "bypass throttle" should be close when full throttle and open when engine is idle?

[CHILL Gone DUTCH]

Sorry What I mean is when the charger is off the car the flap should be just closed What happens on the car depends on the valve it self and if it's working

[CHILL Gone DUTCH]

When idling it should be open Closed when on throttle

[vadonchez]

ok mine is closed when engine is off because of valve spring.

When engine is start i don't know i have to check but if i accelerate in neutral i can see the valve open the bypass thottle.

 

how can the valve open the bypass valve when i rev a little and close it when i rev hard, is the pressur into the valve reversed?

[vadonchez]

i think i have understand (a friend help me).

 

In fact there is always a vacuum into the valve hose but more or less.

 

When throttle body is closed (idle) or a little bit open (low charge), vaccuum in valve hose is high so the bypass throttle is open.

As soon as the TB is fully open, vacuum into valve hose decrease to a point where the valve spring succeed to close the bypass throttle.

 

Bye

[Exmantaa]

i think i have understand (a friend help me).

 

In fact there is always a vacuum into the valve hose but more or less.

 

When throttle body is closed (idle) or a little bit open (low charge), vaccuum in valve hose is high so the bypass throttle is open.

As soon as the TB is fully open, vacuum into valve hose decrease to a point where the valve spring succeed to close the bypass throttle.

 

Bye

 

That is correct. And only the upper connection of the vacuum actuator is connected with the charger. The bottom connection should stay open to atmophere on our builds. (Is used for boost control on the original GM car)

[Bargi]

If what you are seeing is correct then yes that's wrong. But you would have no boost at WOT and you max HP would be the same as an NA engine. Also you'd be boosting at idle and in doubt the car would be in any way drivable Have you fitted a charge cooler? If not that power sounds about right. Otherwise what is the size of your pulley? Did you upgrade the injectors? Sent from my SM-G950F using Tapatalk

[CHILL Gone DUTCH]

And has it been mapped

[vadonchez]

yes front proalloy rad lsj injectors, peter sent me new map for obdtuner soft

Supercharged kit was sale by "the batman" with 3,35" pulley

 

today i try another power mesurement and  performance on a good street and here are the results (i use the racelogic performancebox):

 

Power 220CV

0 to 62: 5.2

0 to 124 :  19s

1/4 miles : 13,2s

1000meters: 24s

 

why is my power output so low?

Because i have chris tullet manifold and sport cat i was thninking about 240hp

 

I keep my oem catback but i remove everything into it, do you think it could be a problem for gaz output?

 

I try a run with bypass disconnected and power is the same so no bypass butterfly leack or something like that.

 

Thanks

[The Batman]

Can you take a photo of the bypass valve fitted please

[vadonchez]

 

[Exmantaa]

You have OBD-Tuner, so  why not make an OBD powerlog with that and show us the graph?

If something is wrong you can spot it there much easier.

[vadonchez]

obdtuner give me 260hp and 30mkg....not the reality for sur!

 

[vadonchez]

i made a log tonight so if yu want see something (inlet temp, map etc...) please ask me and i will post a screenshot

[The Batman]

A little confused So obdtuners is saying you have 260 but Performance box is saying 220? Is the Performance box a figure for whp?

[Exmantaa]

obdtuner give me 260hp and 30mkg....not the reality for sur!

 

 

Nothing wrong with that!!

Now put the rev limiter @ 6800rpm and repeat.

 

In the bottom of the power graph you can monitor the MAP(boost) pressure, knock etc. (You can zoom in on this part)

 

(Edit; it maybe does not feel as powerfull, because you have almost the same flat torque from 3000rpm to the rev limiter. Not bad... )

 

Edited by Exmantaa, 04 August 2017 - 10:23 PM.

[CHILL Gone DUTCH]

Would of expected a dip in torque to cross the power line Think I would be happy with that at stage 2

[vadonchez]

yes performancebox is use by professional for perfs measures (1/4miles, 0to62 etc..)

Obdtuner has been know to be a little bit too optimistic

If weight is ok, the perffbox give you an accurate result (approx 5%)

 

ok so do you think that there is no problem?

For you my pressure is ok

 

on this you will finf inlet temp on top and map pressure on bottom (blue) + coolant temp (black):

 

 

 

and here is the total knock on bottom vs engine rpm on top:

 

[vadonchez]

i expected for a lower inlet temp, here you see that it increase to 50° and move between 50 and 65 °C (peak)