Mines Front Pipe - Questions

[StretchGSK]

Hi

I have installed a used Mines front pipe that i got a really good deal on.

I was mainly looking for a little exhaust note tuning for that Mines sound.

I was surprised what a difference the equal length front pipe made to the exhaust note :-)

It is an older version with 60mm at the turbo's into 70mm.

As this is the same sizes as the OEM front pipe I don't expect much performance gain.

However boost response feels improved.

Is it possible or is it just the smoother sound tricking me?

Will admit I was enjoying the sound to much to take note of actual RPM vs boost

There is no flex joint in the pipe, are there any issues with not having one?

Lastly if the pipe diameter is the same would I need a dyno run to be sure AFR is still ok?

In fact can anyone point me at some good resource for understanding what sort of changes require a re-tune?

Thanks

Stretch

[KiwiRS4T]

Unless you have an aftermarket ecu you can't "re-tune" it anyway. For an expert look at your car take it round to Geoff at Shred Motorsport:

Shred Industries Performance, 67 Pharazyn St Lower Hutt 5010, Melling, Lower Hutt City

they have plenty of Skyline experience.

[StretchGSK]

Unless you have an aftermarket ecu you can't "re-tune" it anyway. For an expert look at your car take it round to Geoff at Shred Motorsport:

Shred Industries Performance, 67 Pharazyn St Lower Hutt 5010, Melling, Lower Hutt City

they have plenty of Skyline experience.

Thanks for the reply, I do have an F-Con so a re-tune is possible.

I am just not sure what sort of physical changes it can cope with on its own?

Andre at Speedtech looks after my baby but I must pop in to Shred some time

[R31Nismoid]

no flex is always a problem as its not absorbing movement of the motor and exhaust. this can lead to cracked manifolds over time due to weight/heat.

as for tuning, as above, no point even if you had a ECU to be honest. not enough of a change to warrant the expense really.

[Moodles2]

Stock frontpipie is 2x 50mm in and 1x 60mm out

[StretchGSK]

Stock frontpipie is 2x 50mm in and 1x 60mm out

Not on a R34 GTR it's not...

[StretchGSK]

Quick update after a visit to my tuner.

First the boost response was not improved as the dyno plot shows the boost peaking at the same RPM....amazing what sound and your mind can make you think.

I guess this was to be expected considering the pipes were the same diameter.

The AFR had leaned out in the top part of the rev range.

Front pipes and cat back exhausts combined to make the AFR a full point leaner and he could hear some detonation.

So I think the $$ to getting the tune checked was well spent

On the plus side after a tweak to the tune there was in increase of 21 KW which I was not expecting at all add that to how she sounds now and I am very happy!

Thanks for the input from those that replied.

Stretch

[Harey]

Quick update after a visit to my tuner.

First the boost response was not improved as the dyno plot shows the boost peaking at the same RPM....amazing what sound and your mind can make you think.

I guess this was to be expected considering the pipes were the same diameter.

The AFR had leaned out in the top part of the rev range.

Front pipes and cat back exhausts combined to make the AFR a full point leaner and he could hear some detonation.

So I think the $$ to getting the tune checked was well spent

On the plus side after a tweak to the tune there was in increase of 21 KW which I was not expecting at all add that to how she sounds now and I am very happy!

Thanks for the input from those that replied.

Stretch

Did it improve the response as well? Post up the dynos if you have them

[StretchGSK]

The boost curve is pretty much identical except the boost does not drop off as much