I think I may have a fault with my left hand side turbo, (as I sit in the car) I think it is not boosting for some strange reason.

I suspect that I may have disturbed/damaged something when I grounded the car accidently, catching the left hand side down pipe.

Is it possible to easily isolate each turbo at a time so as to see the function of each one individually?

It's definitely not responding as she used to.

 

Thanks in advance..

What is this? I have divorced elbows/downpipes and they where a direct replacement for my stock cast iron ones. 45degree angle. So I have divorced downpipes with the stock cat pipes. Which shouldn't mate up according to your sketch Stephen and those n/a downpipes there's a picture of wouldn't fit a turbo unless you cut them to reweld a flange at the correct angle.

Now there's a weird one! Yeah my elbows were 90'. When I got my decat/testpipes I was sat there looking at it and I would if needed an adapter of 45' (there's also a side angle too) they simply wouldn't fit. Maybe there's some variation between between markets, is yours a Euro spec spiff?

 

I think he has the lower picture Richie provided mated to the stock elbows. The upper picture is what I have as a complete assembly, you can't intermix those because of the 45' flange. This is why we need some pictures to establish exactly what's fitted.

Edited September 14, 20169 yr by Stephen

The lower pic is the same design as the standard exhaust section that bolted to the original elbows. You can see the 90* elbow/ bend on my OEM pic below.

 

Here's my elbows. Eurospec lhd.

 

But that shouldn't matter, I haven't seen any downpipes stating they only fit lhd or rhd, Japanese, euro or us. What matters is do you have a 4 or 5 bolt turbo, that's what everyone asks when you ask for advice on aftermarket downpipes

Here's my elbows. Eurospec lhd.

 

 

They are completely different to Jap spec. There's a new one on me. So it would appear it's only an issue for Jspec cars.

Don't euro and UK spec cars have a precat passenger side so the turbo elbow would be different? or am i thinking of something else.

Edited September 14, 20169 yr by Alic

Don't euro and UK spec cars have a precat passenger side so the turbo elbow would be different? or am i thinking of something else.

They have precats on both sides, embedded in the downpipes

I think he has the lower picture Richie provided mated to the stock elbows. The upper picture is what I have as a complete assembly, you can't intermix those because of the 45' flange. This is why we need some pictures to establish exactly what's fitted.

 

Agreed Steven, I am 99% certain that mine are as you say, the second picture.

Thanks for posting Richie. :thumbup1:

Hopefully these pictures may shed some light.

Yeah 90 degree onto the manifolds. Same as i have on my jap

Edited September 14, 20169 yr by Alic

Is it a UK or JDM car bud?

Richie,

 

There does seem to be a slight difference between the second picture of the test pipe you posted and mine.

My one doesn't have a bulged section at the joint to the rear section.

Please see photo 1.

At least we can confirm that they have the 90' flange though.

Is it a UK or JDM car bud?

 

Hi Steven,

 

UK model, 1992 lwb

Hrm, I would expect euro and UK to be the same, ie as spiff posted. Kinda hard to tell from the pics. Does the flange run parallel to the floor?

Hrm, I would expect euro and UK to be the same, ie as spiff posted. Kinda hard to tell from the pics. Does the flange run parallel to the floor?

 

From what I can see, they do appear to be parallel to the ground.

Richie,

 

There does seem to be a slight difference between the second picture of the test pipe you posted and mine.

My one doesn't have a bulged section at the joint to the rear section.

Please see photo 1.

At least we can confirm that they have the 90' flange though.

 

Yeah Dave, they're pretty much the same style with the exception of the bulged section / resonator. They still bolt up the same so you'll need to sell your ones and get the correct test pipes to match the divorced downpipes, hope this helps.

Yeah Dave, they're pretty much the same style with the exception of the bulged section / resonator. They still bolt up the same so you'll need to sell your ones and get the correct test pipes to match the divorced downpipes, hope this helps.

 

Richie, thanks for your continued help, I think I am beginning to understand things now.

Bloody minefield.

 

Would a resonator give me a better sound?

Richie, thanks for your continued help, I think I am beginning to understand things now.

Bloody minefield.

 

Would a resonator give me a better sound?

 

I'm not sure if they give a better sound as people all have differing tastes/ideas on what they see as a nice exhaust note. I'm personally getting a true straight through system from the turbos back, but again that's all that was available to me, should we get resonators?? Does it help prolong the life of the turbos?? Does it create back pressure or does it create turbulence with the exhaust gases? I don't know the answer to any of this, I'm sure some of our more qualified guys will be along to answer these questions. There's probably hundreds of these debates online which can be confusing as each one will be either pro or con and they'll have their arguments for each. I think it's up to the individual to decide themselves. So, after all that, I can't really give you an answer:innocent: All I can do is show you the difference between the NA decat and divorced downpipes with testpipes, so that you don't make the same mistake I did by thinking they're all interchangeable and will mate up to each other.:yes:

Edited September 15, 20169 yr by Richie K

The resonator is designed to eliminate certain sound frequencies and generally does not affect the flow very much as it si a straight through design. Usually a resonator is just a cylinder around the pipe with a few holes in the pipe to absorb the certain frequencies of the sound. As there is no obstruction, no backpressure is created. I have resonators on my decats and if I’m honest, I didn’t notice a difference in sound or volume between the cats and the resonators, but it has seemed to make the boost more responsive. Resonators can be designed (in conjunction with the exhaust) to ‘tune’ the sound to your liking. Gray’s found his straight pipe too loud so added some resonators on it to quieten it slightly.

 

Its all preference and not everyone wants straight pipes but still want the increased flow so resonators (& silencers) can be the answer.

They have precats on both sides, embedded in the downpipes

 

Eurospec have two precats. UK spec have only one on the passenger side.

Eurospec have two precats. UK spec have only one on the passenger side.

 

Thanks for clarifying that Andrew, I had heard that this might be the case, but was unsure.

Coincidently, this was the side I grounded accidently on a high kerb, could this have been damaged/disturbed?

 

Out of curiosity, would this explain the difference between not only the O2 readings but also the exhaust note at idle?

What? That can't be good? You're having one bank with more backpressure then the other then, putting extra load on one side of engine?

You could fit a Jspec turbo elbow in that side to test, be a cheap option for a bit?

What? That can't be good? You're having one bank with more backpressure then the other then, putting extra load on one side of engine?

 

Puzzled me also.