Is this turbo surge you can hear?

http://www.youtube.com/watch?v=mHmdO...elated&search=

 

Dunno tbh

Sounds like a weak 'chatter'

 

Ive no sound on this PC, but from Radders description, i would say yes.

As it sounds exactly like "weak chatter"

 

99.9% it is.

I would say 100% is but i've never heard a diesel surge before.

 

Its hard to tell Chip, I dunno im no expert... But when I've heard "Surge" at track days, its a faster pulse, this sounds like hes coming off thottle slightly and its chattering a bit

I dunno, Want to though!

 

the worst motorsport there is i'd guess its surging aswell

 

Just clicked the link to watch it without sound.

He wont be backing off the throttle I suspect, those guys drive with the throttle in one position only

Loads of tractor pullers surge, they dont give a fuck about the turbos etc, they are more nuts than drag racers, LOL

 

It's surging.

Don't forget, on track you'll hear it only momentarily before there's a gear change.

Remember Porkie's old turbo doing it at Bedford, and it was properly loud!

 

Porkies was doing it alot at Ford Fair just after the first corner, and it was loud!

 

deffo surging

 

sweet noise! i want some!!

so whos going to explain how a turbo surges then?!

 

As i understand it, the turbo trying is to flow more air than the engine car consume.

 

the engine cannot consume the air the turbo is trying to force into it so it comes back thou the turbo. the noise is that air going the wrong way though the blades

causing vibration/ damage

 

Not good in other words............

 

Extremely bad. Surge can in some cases shear the compressor or turbine clean off the shaft. LOL

 

Stu, excuse my ignorance, so WHY do GT series turbos surge so much..(SUPPOSEDLY)

 

Because the turbo`s is to high a spec then the engine`s build for(spec`d for / head porting)

 

I Also noticed the reyland sierra surge's.

Up until now i just thought the car sounded like it wanted more and the turbo was struggling to provide the needed boost.

How wrong was i

 

Thank you my friend.....


But i'd of thought Porkies 3 dr was/is a very good spec engine...

 

And it problably is, but it is also wery hard to spec an turbo to an high power engine, without it surging or missing out on high revs, it`s always an compromise.
If your building an high power engine(500+bhp) it is wery much up to the head porting and turbo choise, if you get surge or not, to big porting = low air speed and thus surging from a bb-turbo because of the quick spooling.
On my car, we did the porting as big as possible without loosing out on air speed (flow speed in the head) and an gt-35 with 1,06 ex-housing, works great
Could have done the headporting a lot bigger, but then i wouldn`t have any power below 5000rpm

 

They dont, Well not on my engines anyway ,
I have no surge what so ever on a GT35 with a .82ar exhaust housing,
I have only a very slight chatter if you load up a GT30 with a .82 in 5th and most people never get it this area so never notice it,
No surge on GT4088 over 2.5bar@4.5k ,
I could easly biuld one that does but I choose not to .

Mark

 

Is this a bit of surge as this comes on boost? About 19secs into the vid...

http://www.youtube.com/watch?v=qD0gv4wJSMg

 

Would this be surge as well on Warren's (I think) Escos ? I always though it was.

http://www.leetfighter.com/~jamz/escos.wmv

 

Indeed it is Steve

 

This is most likely caused by not using full throttle as it comes on boost, I call this choke as the 30%or so Throttle is not letting the air in to the engine causing it to choke.

Mark

 

Mark, that's why i said SUPPOSEDLY..............


Mark and for all this talk about them being weak, hasn't Kev been using one for a while now and HARD driving in the TA series?? so they can't be that shit...

 

I'm guessing that's because his uncle was driving it, and the way he was driving it....

 

Pete

I have used them for a few years now all running over 2 bar and all over 500hp, I have only seen one fail and this was Sunnys one and this failed because it was not water cooled and was on a topspeed run so there was to much heat to get rid of and this is why it failed,
I only use GT turbo's now and nothing else.

Mark

 

That GT Turbo weakness thing is bollocks, know counltless non ford cars running them with no prob.

Its a BS PassionFord/Ford rumour, but as people like MikeR say it all the time, people listen.

I know where that rumour came from, and its a bit daft for people to say its weak from where this all started from, fuck, ive seen 2x RS500 T4s fail from 3 cars with them in the space of a few hours once, snapped shaft and summat else, and there was 2x GT35 cars there on the same day and neither had problems.

 

Do tell.