Would it be feasable to use 2 sets of air injectors to completely eliminate turbo shuffle on a twin turbo installation?
My thinking is that both turbos could be mapped so that they are completely matched at all revs/boost.

 

Yes it could be done but not many ecus have the ability to do this correctly
as most only have control for ONE waste gate.

Which ecu's can do this I couldnt tell you for definite BUT I am pretty sure T6 can.

 

would fancy electronic jap boost controllers not do this?(ie if you get 2 then set them up identically?)

 

Thanks Simon

 

The trouble with using independant boost controllers goes back to Cams
original requirement of no "boost shuffle".

Effectively the control required is one turbo controlled in the normal way
and the other control loop is slaved off the boost setpoint of the first.

One major flaw of this type of control is that generally both outlets of the
turbos join up together at some point before it enters the engine rather
than just feeding the cylinders that drive the exhaust turbine of one turbo.
This has the effect of promoting "turbo boost shuffle" by the average
airflow created within the intake system.

Will be a bitch to set up properly IMO

 

Cam what has Rod b said, when does the problem start and stop.

Mark

 

what about one single external wastegate for both turbos?could that be done?like the f40?

 

...motec/autronic toys...

 

My post wasnt about my car it was an idea I had after seeing jonm600 posting on the GTR forum about shuffle on his new GTR.
Mines has the slightest hint of shuffle now and again but coming off the throttle for a sec then reapplying it sorts it.

 

compared to t62000 they are

 

If it is shuffling before the wastegate starts to open then there is nothing you can do,
If it is when they start to open then adjust wastegate opening to trim it,
The only time I have felt it on a TT car it was part throttle below wastegate min pressure so you cant do anything.

Mark

 

Mark, wouldnt seperation of the intake system cure this ?

The only drawback I could see is you would need 2 throttle bodys,
2 intercoolers, 2 ecu's

 

I only get it occasionally under load at about 3800-4000rpm with about 0.8-1.0 bar in 4th/5th/6th but if I come off the throttle then nail it that sorts it. Probably could be mapped out but it happens so infrequently its no biggy.

 

 

Turbos are spooling about 2750rpm making positive boost and making 0.5 bar by 3250

 

Cam so the min boost you can run across the rpm range is .5bar

Mark

 

Its just as they come on really song in the high gears at 3800-4000 but only manifests itself when cruising at 3500 then flooring the throttle.

 

Cam is the boost .5bar or more at this flutter point

Mark

 

between 0.8 and 1.0bar

 

Cam as this is just above the min boost I would look at the wastegate balance more than a boost control issuse,
Autronic could control 2 air injectors on a duty cycle but IMO the problem is wastegate balance first but this would be very diff to cure completly.

Mark

 

Ive got some new turbos to try but I need to convince Rod to allow them to be fitted esp as they came from the States he is very sceptical

 

Cam pm me the details on turbo's Rod could be right if I guess right the spec.

Mark

 

Just put a single on it, job done and a lot easier to get one exactly to the spec you need then too

 

a t6 couldnt do this set-up out of the box,, but pectel will write the program for you

 

T6 is well know for running twin air injectors gareth - have a look into rallycross and at the twin port WRC cars the program is out there

 

i was going too run a pectel t6 on my skyline, but was told the pick up on the cam pulley sensor couldnt be done yet as they were working on a system for it. so went to life racing f88 instead. i would be very surprised if this system couldnt run twin air injectors.

mine actually flutters slighty at the mo but its cos the wastegates are not set up right yet. i am hoping it will be cured some too. didnt know it was a common thing on tt setups

 

thats a different set-up,, when doing this you just set one of the PWM outputs too anti-phase

 

In what way? nothing is off the shelf, but not hard to do, no harder than any other car.

There you go, GTR engine on T6, can keep the cam pulley sensor if want, but this one hasnt...

 

fair play fella, was told by my tuner it couldnt be done yet. hence went life racing.

 

https://passionford.com/forum/viewto...ghlight=pectel

 

all it needs is a pick-up for engine phase,,which would of been easy!

 

he did say it could be picked up from the crank sensor or something. never mind...lol. i have been told the life racing is a better system . dont know weather it is. but does for me. same money as a t6 tho

 

you couldnt of used the crank sensor (well unless you want batch fired injectors) as the crank spins twice as fast as the cams but there was a million ways rounf it

 

might of been the case of couldnt be bothered then...lol

 

LOL

 

Life racing are all ex Pectel people never seen a life racing ecu's but i'd imagine they are similar to the T6/T10 ecu ranges....

Quality ecu's I beleive I know Tony Bardy is using them on some of the rallycross cars...

 

sibster


i wondered who they was and where the ecus came from

 

i had never heard of them either. but i trust paul who sorted it all out for us and got the loom made up etc. he says its a pukka piece of kit

 

Paul Hills?

 

yeah, been dealing with him for a few years now. old man uses him in his 500, i used too as well in my old saff cossie