Just wondering what kind of rev range does everyones turbo kick in? Had mine in for a wheel bearing and something else a while back at a trusted garage and one of the guys there reckons it may have been chipped but sadly there is nowhere local I can get it checked (not that I'd know where to start).

It usually gets around 31-32mpg, even doing long journeys and motorways whilst driving as sensible as possible I can only just manage 37ish which I thought was a bit low.

How much to the gallon? Wow, I get 50plus. My turbo comes in at 1500 to 1700rpm

I don't think having it chipped changes when the turbo comes in, it's just quicker to get there , I have got a tuning chip box and the turbo comes in the same revs but just keeps on pulling.

to be honest you might find its good to get an EGR blanking plate on there.

That will bring the turbo range from around 1700 down to about 1300

How much to the gallon? Wow, I get 50plus. My turbo comes in at 1500 to 1700rpm

I don't think having it chipped changes when the turbo comes in, it's just quicker to get there , I have got a tuning chip box and the turbo comes in the same revs but just keeps on pulling.

what make of tuning box do you have

what make of tuning box do you have

I don't actually know. It cost £35 of eBay. Was a bit worried about putting it on the car but wow. What a response. It pulls pulls and pulls. Before you know it you could easily do more than the national speed limit.

I'll try and find the link.

I would blank of the EGR as quoted above I have. And it runs so much better, I have the ine with a 10mm hole in it so it doesn't bring up the MIL light. Again on eBay about £4. One of the best mods so cheap.

I would be interested to see what you used as well

I would be interested to see what you used as well

The box I have is called ok tuning. Google it and you will find some videos they aren't English but they are on eBay I can't go back far enough on the app to see the sellers name. I'll keep looking.

Crikey, well it's good you had a good experience, but are they a resistor in a box job or a microprocessor?

What do you all mean 'my turbo comes in at 1500rpm'?

As far as I know, the turbo is 'in' as long as the engine is running (isn't it driven by the exhaust gases?)

Can someone explain what they mean please?

the turbo boosts lower in the rev band with more low down grunt

paul

Do you mean the turbo lag is reduced?

the turbo winds/spools up ('charges' for a laymans term) with exhaust gasses and then releases the boost into the combustion chamber. It only works for certain parts of the rev range as a boost to get the sluggish diesel up to speed. for example, it might come in at about 1500rpm and last till 3000rpm. even though the engine rev range is 0 - 6000 rpm.

on a tuned petrol turbo it might take ages to spool up at 3000rpm and last until about 7000rpm. Some turbos sound like small jets taking off as they spool up and then release their air pressure.

So a turbo can actually store 'boost' and then release that boost at a certain part of the engine rev range?

Didn't realise that.

Its not a case of storing.

Basically, it's just spooling and building pressure all the time, but when it hits 1700,the pressure inside increases drastically and subsequently releases quickly, that's when you get the turbo surge.

It's like blowing up a balloon, you keep going and going and going, the pressure guilds and at the right pressure, it all escapes and blows the balloon up. The turbo does this and the pressure overcomes the turbo and bursts out, at higher speeds the air intake increases with more airflow and the turbo goes on until it can't work any longer

I understand now...........many thanks for your explanation :)

No worries :-)