Has anyone had issues with the jw automotive 1856 turbo. I’ve got a new one fitted to my car with all the relevant supporting mods and have taken it to an extremely reputable tuner who at present can only get 190hp out of the car and around 400nm. Apparently it’s making the boost but not flowing well. The car has the usual 4 car map sensor. Head bolts. Dark side intercooler with hard pipes. New gasket. Belts and braces really. Just wondered what peoples experience with this turbo was like. Thanks 

Jack 

400nm is big torque, it should pull like a train, not sure what you were expecting but you've only gone up two small steps from the standard turbo which is a 1749, next up is the 1752, then a 1756 which is about where you're at.

The BHP figure is meaningless and frankly the flow remark is just downright dumb, only really relevant to petrol turbo engines which rev MUCH higher and consequently have to shift a lot more exhaust gas.

I'd be pretty happy with that torque figure, try shortshifting and pulling a taller gear for moar go!

Thanks for the reply I’m not unhappy just against the claimed figures of 250hp with standard injectors and 300 with bigger ones I just thought it was a bit away from where it should be. The turbo seller said on his car similar set up he’s got close to 300 and he’s also confused as to why it’s not doing more.  Like you say maybe it’s not about the bhp though. I must admit I thought they would run out of clutch before turbo. The cars still with them and they are going to play around more tomorrow after a full day on it today so we shall see.

Dude, there's absolutely NO WAY a 1756 will make much more than 200 BHP, let alone 250 to 300, you and your mate must be smoking too many herbs!

We've seen 250 BHP on various 2260 cars and a couple at 300 ish which weren't reliable and kept blowing up.

Unless I’m missing something I said 1856 ? Im unsure if you mean it’s a 1756 hybrid and they have called it 1856 please elaborate. I never mentioned a mate and I don’t partake in the devils leaf. the cars with a tuning company. No need to be like that really I'm just asking for advice mate. The maker of the turbo JW automotive in Essex claim 250 all day with more to go and have videos on their website of cars doing that albeit with a lot of smoke hence why I was just asking if anybody has knowledge. I honestly wasn’t sure what to expect just going off the claimed figures etc. like you say the torque seems decent anyway.

@sepulchraveCan I suggest some new glasses?

 

@Jackw123I assume the tuning company has experience with this turbo? If not, may get them to ring JW for a bit of troubleshooting?

Thanks for the response 👍They are called big fish tuning in the north east very reputable place by all accounts and not afraid to get their hands dirty. I’m unsure if they have worked on this particular turbo but have done many pd engines over the years. They did say they played with the actuator a little bit didn’t make much difference. It’s a strange one the guy said it’s making the boost (2.1 bar) just it tails off after 3k. Certainly an odd one. They are happy enough with the engine etc and all the supporting mods. But yes as you say I’m going to ask them to get in touch with JW to see if there’s something we’re missing. Like I say the torque figure seems decent enough I just thought against the claimed figures of 250-300, 190 seemed a little low but just thought I’d put it out to see what people know. There’s plenty on YouTube running this turbo many with offensive amounts of smoke but not much actual write up wise online in terms of reviews etc. thanks 

26 minutes ago, Jackw123 said:

Unless I’m missing something I said 1856 ? Im unsure if you mean it’s a 1756 hybrid and they have called it 1856 please elaborate. I never mentioned a mate and I don’t partake in the devils leaf. the cars with a tuning company. No need to be like that really I'm just asking for advice mate. The maker of the turbo JW automotive in Essex claim 250 all day with more to go and have videos on their website of cars doing that albeit with a lot of smoke hence why I was just asking if anybody has knowledge. I honestly wasn’t sure what to expect just going off the claimed figures etc. like you say the torque seems decent anyway.

 

1756 and 1856 are basically the same thing, both with a 56mm compressor wheel, barely measurable difference to the exhaust geometry.

It's the compressor that makes the boost.

 

When I said your mate I meant the guy who sold it to you.

 

The smoking thing was a humorous reference to the crazy figures being claimed.

 

I've been here fifteen years and I've seen them all, I used to work in the tuning trade so I know what I'm talking about.

 

I just got some new glasses btw.

Right I’m with you.  Soon your opinion is the figures it’s making about on the money would you say ? I only questioned it as the lads mapping it are also very knowledgeable and seemed baffled as to why it wasn’t doing more which in turn made me doubt it etc.

1 minute ago, Jackw123 said:

Right I’m with you.  Soon your opinion is the figures it’s making about on the money would you say ? I only questioned it as the lads mapping it are also very knowledgeable and seemed baffled as to why it wasn’t doing more which in turn made me doubt it etc.

 

I would have expected 200 BHP tbh and the standard injectors are good to 220 ish but 400nm is bang on the money and will give the clutch some serious work to do, careful with big pulls in high gears, you might get some slip.

Bear in mind a 1752 is a standard PD150 unit which will map to about 180, 1749 is standard PD130 and maps to 165 so going up 4mm on the compressor is not suddenly going to split the planet open, it's going to add about another 20 on top of the 1752.

I'm guessing it's running about 2.0 bar boost which is 3.0 bar absolute.

 

Tuners make crazy claims to justify big bills but this ain't rocket science, you could've mail ordered a generic 1756 map and probably got better results.

 

Diesels are different to petrols, REALLY different, PD's especially so since they have a set of steel vanes baffling the exhaust gases before they even hit the turbo.

 

I would get the VNT actuator checked to make sure the settings are correct.

Great cheers for the info sounds like it’s there abouts figure wise then really. Yeah it’s got a new LUK clutch which I plan on upgrading. I plan on being moderately sympathetic with it. Who knows they may be able to tweak it a little tomorrow and get a little more but that’s cleared that up for me. Thank you. I’ve not driven it so I’d imagine that would feel pretty quick when I pick it up. 

11 minutes ago, Jackw123 said:

Great cheers for the info sounds like it’s there abouts figure wise then really. Yeah it’s got a new LUK clutch which I plan on upgrading. I plan on being moderately sympathetic with it. Who knows they may be able to tweak it a little tomorrow and get a little more but that’s cleared that up for me. Thank you. I’ve not driven it so I’d imagine that would feel pretty quick when I pick it up. 

 

Torque is up 50% on standard so it's gonna feel pretty urgent, yes.

Picked the car up today final figures 197hp 430nm. Pretty pleased with it to be honest it shifts well for a daily. Thanks for the advice 

3 hours ago, Jackw123 said:

Picked the car up today final figures 197hp 430nm. Pretty pleased with it to be honest it shifts well for a daily. Thanks for the advice 

 

That is a truly brutal torque figure, you'll be doing the clutch sooner rather than later!

Yeah I think so to. Hopefully it lasts 6 month and I’ll have it changed by then. Any recommendations? 

Also here’s the graph if your interested 

I think you should definitely have more hp as mine was on a 1756 and pushing 228bhp but it had less torque at 288 lb ft or  390nm so not sure what’s up with your 1856 as I know people getting 270bhp on standard injectors

That is a hilariously poor result for such a setup . I have more or less the exact same setup from JW and made 255bhp and 530nm . Everyone I know with this turbo makes similar numbers . From what you’ve said it sounds to be your tuner doesn’t know what he’s talking about . And also for the people saying an 1856 is only slightly bigger than a standard turbo or ever a 1756 don’t know what they are talking about . It’s a much bigger turbo with a housing from a 2052 Audi turbo . So closer to a 2060 than a stock turbo or even 1756.

On 25/02/2025 at 21:09, oneillcharlie said:

And also for the people saying an 1856 is only slightly bigger than a standard turbo or ever a 1756 don’t know what they are talking about . It’s a much bigger turbo with a housing from a 2052 Audi turbo . So closer to a 2060 than a stock turbo or even 1756.

 

It's very simple,1856 means an 18mm exducer with a 56mm inducer, standard is a 17mm exducer with a 49mm inducer. This isn't rocket science, all that pub talk nonsense is no substitute for experience and housing size is utterly meaningless.

It takes more exhaust gas energy to turn a bigger wheel, turbo sizing isn't magic, an engine is simply a pump, a bigger pump can drive a bigger turbo.

2 minutes ago, sepulchrave said:

 

It's very simple,1856 means an 18mm exducer with a 56mm inducer, standard is a 17mm exducer with a 49mm inducer. This isn't rocket science, all that pub talk nonsense is no substitute for experience and housing size is utterly meaningless.

It takes more exhaust gas energy to turn a bigger wheel, turbo sizing isn't magic, an engine is simply a pump, a bigger pump can drive a bigger turbo.

Lol very funny that you think that .Go measure the turbine exducer on an 1856 and you will find it measures in around the 46mm  mark . The way garret names its turbos is as follows , the first part GT18 is a nominal number , meaning it doesn’t equate to an exact measurement, it’s just a housing series. Similar to the way a td04 doesn’t have a 4mm turbine haha . Another example would be a gt1749Vb (pd150 turbo)  this has a 43mm turbine inducer and a 49mm compressor exducer . You will not find anything measuring 17mm 😂. 17 is just the housing series . Meanwhile an gt1856 from JW used a turbine and shaft from a gt18 turbo , a compressor housing from a gt20 turbo and custom made 56mm compressor . Not sure what the hot side housing is off to be honest . 
but yeah a lot bigger than a 1756 in every way apart from the size of the compressor wheel and much more capable .

38 minutes ago, sepulchrave said:

 

It's very simple,1856 means an 18mm exducer with a 56mm inducer, standard is a 17mm exducer with a 49mm inducer. This isn't rocket science, all that pub talk nonsense is no substitute for experience and housing size is utterly meaningless.

It takes more exhaust gas energy to turn a bigger wheel, turbo sizing isn't magic, an engine is simply a pump, a bigger pump can drive a bigger turbo.

And what a great analogy about sizing turbos 🤣🤣 if only it was that simple . Volumetric flow rate of your engine is the dictating value when speccing a turbo for a car . If your housing is too small you will never flow enough to make desired pressure at high rpm’s