Boosting problems

[Besty-FR]

Barely anything, about 60 at best, but I've adjusted it and it doesn't seem to change

 

[Besty-FR]

Oh sorry I read that wrong I thought you meant when doing the on/off test, you mean the difference in act. And spec?

 

[Badger]

I meant the on/off test lol.

60mbar is nothing! Something definitely wrong with the turbo if you have adjusted it and it doesn't change, have you tried winding the turbo stop screw out?

 

[Besty-FR]

I wasn't sure if it was giving that reading because it's a large hybrid, I've adjusted it but maybe it just wasn't enough? But I'm pretty sure from memory I moved it about 3/4 - 1 turn but I'll happily try again, maybe start by winding it right out and starting from there. I have wound it out but I was being told to wind it in by the mapper and supplier, by out you mean anti clockwise if looking from underneath?

 

[Badger]

Yes, my GTB1756vk could get a 140mbar difference, your hybrid should definitely get at least 120mbar.

 

[Besty-FR]

Ok I'll give it another go

 

[Badger]

What's the spec of the hybrid? Turbine wheels?

 

[Besty-FR]

Rated to 250bhp and 2.2bar, is on a gt1749vb manifold but bored out to hold larger wheels and was called a gt1860 by the supplier, using the same 60 as the gtb2260vk and uses a gtx wheel, that's pretty much all I can give you, he withholds most information

 

[Badger]

If it has a 18 hotside, you should be able to get a good low end spool.

GTB2260vk get full boost of 2.5bar by 2500rpm...

 

[Besty-FR]

Exactly why I'm complaining and getting fed up lol cheers for your help, will have another go and report back

 

[Besty-FR]

To give you an idea, I'll give you figures for every 250rpm

Rpm. Spec. Act
1200. 1365. 1067
1500. 2072. 1146
1750. 2433. 1303
2000. 2700. 1491
2250. 2857. 1758
2500. 2998. 2056
2750. 3061. 2574
3000. 3108. 3155
3250. 3140. 3281
3500. 3187. 3454
3750. 3187. 3501
4000. 3187. 3092

 

[Badger]

Have you installed a 4 Bar map sensor?

 

[Besty-FR]

Yeah

 

[Badger]

Those veins are not closed enough to keep the spool good.

Need to close the veins and leave the arm for the moment. 2.5bar over boost isn't healthy for the turbo either...

It looks like the ECU catches the over boost between 3750 and 4000 so SVBL is ok.

 

[Besty-FR]

Ok will have a play when the rain stops! Which doesn't look like any time soon lol

 

[Besty-FR]

No good, best I could get was 80 and it was still no good, getting new turbo, thanks for your help

 

[Badger]

That's a shame, hope the next one is better.

Things like this is why I chose to go for a GTB setup instead of hybrid, newer technology etc...

Easy to setup too!

 

[Besty-FR]

Yeah there's a lot of work involved in gtb though, downpipe needs cutting, downpipe flange, oil return pipe and lining up the intercooler pipes with the turbo

 

[Badger]

It's more work, I'm sure the next turbo should be better.

 

[Badger]

Have you tried the turbo now you've adjusted?