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3" Downpipe has arrived - warning Shiny!!


ORIGINAL: marcoturbo

very tempting...

Can the dual tailgate of the rear section be changed to an oval factory look tailgate ?
Click to expand...

You can specify whatever shape/size/configuration you want.
 
Looks almost too nice to put under a car.

You didn't have and lambda or wideband ports included though?
 

ORIGINAL: John Sims

Looks almost too nice to put under a car.

You didn't have and lambda or wideband ports included though?
Click to expand...

Hi John,

Long time no see!

Yes, there is one the back face of the front section towards the top - you can just see the corner of it on the first photo.

I've also just added another towards the end of the bent section. I'll add a photo later.
 

ORIGINAL: GPF


ORIGINAL: John Sims

Looks almost too nice to put under a car.

You didn't have and lambda or wideband ports included though?
Click to expand...

Hi John,

Long time no see!

Yes, there is one the back face of the front section towards the top - you can just see the corner of it on the first photo.

I've also just added another towards the end of the bent section. I'll add a photo later.
Click to expand...

Bungs for WBo2 sensor. Top one is almost in same place I put it on old exhaust. Bottom one should give same results but is easier to get at!

DSC_7461.jpg


DSC_7460.jpg
 

ORIGINAL: Diver944

Nice pics, have you got it all bolted on yet?
Click to expand...

Just waiting for a few last bits and bobs - heat wrap and more gaskets for the crossover.

Should be all going back together next weekend with a bit of luck.
 
Questions!
Anybody care to give a brief explanation about how the bigger downpipe affects performance and how in theory?(more top end?,less or more torque?)
Does a bigger downpipe in anyway put the engine under less stress at higher boost pressures????(If i am way off here apologies i can drive ok but my mechanical understanding is iffy)
Thanks in advance[:)]
 

ORIGINAL: MarkK

Questions!
Anybody care to give a brief explanation about how the bigger downpipe affects performance and how in theory?(more top end?,less or more torque?)
Does a bigger downpipe in anyway put the engine under less stress at higher boost pressures????(If i am way off here apologies i can drive ok but my mechanical understanding is iffy)
Thanks in advance[:)]
Click to expand...


Hi

Having the bigger pipe help with the spool up of the turbo, i.e as it comes out the turbo it doesn't have any restriction so allows the turbo to keep spinning and the bigger pipe helps clear the gas away from the turbo . As the pipe goes under the car the gas cools so to keep the gas speed up we reduce the diameter of the pipe without affecting performance. If you don't have the power to warrent a full 3" exhaust this is a good combination as it will give good low to mid power where you are 99% of the time on the road . If you are after the power mid to top then a full 3" is for you .



(quote )ORIGINAL: marcoturbo

very tempting...

Can the dual tailgate of the rear section be changed to an oval factory look tailgate ?


If anyone is interested we could play with the price on a Group Buy [;)]


Ian
 
I would be interested in a 3" downpipe and a 3" rear section to go with my existing stainless backbox. I'm probably going to be running the smaller K26/6 turbocharger, would this still benefit from a larger exhaust system? The car will probably make <300HP when rebuilt. Are there any issues going from the ~2" outlet of the turbocharger immediately to a 3" pipe? Thats quite a jump in diameter, would it be better to have a taper?
 

ORIGINAL: MarkK

Questions!
Anybody care to give a brief explanation about how the bigger downpipe affects performance and how in theory?(more top end?,less or more torque?)
Does a bigger downpipe in anyway put the engine under less stress at higher boost pressures????(If i am way off here apologies i can drive ok but my mechanical understanding is iffy)
Thanks in advance[:)]
Click to expand...

Hi Mark,

I believe that it will also reduce back pressure at higher revs with higher boost.....Ian?

Mark, if you want to pop round this week for a look just drop me a pm.
 

ORIGINAL: barks944

I would be interested in a 3" downpipe and a 3" rear section to go with my existing stainless backbox. I'm probably going to be running the smaller K26/6 turbocharger, would this still benefit from a larger exhaust system? The car will probably make <300HP when rebuilt. Are there any issues going from the ~2" outlet of the turbocharger immediately to a 3" pipe? Thats quite a jump in diameter, would it be better to have a taper?  
Click to expand...


Hi

For 300BHP would stick with the 3" down pipe and 2.5" system , unless you want all the power at the top of the rev range .We would really only recommend the full 3" when going over 400 + BHP .Going from small to big over a very short area is ok going from big to small needs to be ideally a 7 degree shallow taper hence the reason we taper down over a long distance on the down pipe .

Ian
 

ORIGINAL: GPF


ORIGINAL: MarkK

Questions!
Anybody care to give a brief explanation about how the bigger downpipe affects performance and how in theory?(more top end?,less or more torque?)
Does a bigger downpipe in anyway put the engine under less stress at higher boost pressures????(If i am way off here apologies i can drive ok but my mechanical understanding is iffy)
Thanks in advance[:)]
Click to expand...

Hi Mark,

I believe that it will also reduce back pressure at higher revs with higher boost.....Ian?

Mark, if you want to pop round this week for a look just drop me a pm.
Click to expand...

Hi

Graham is correct in saying that the 3" down pipe will reduce the back pressure through out the rev range so getting rid of the gas quick puts the engine under less stress and also gets rid of heat build up in the manifold .

Hope that helps

Ian
 
Would be interested in a complete 3" set up depending on price.
Would be with center and rear muffler and a factory-like tail pipe. The twin-reactor looks a bit too much.
 
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