Upping The Boost What Else Is Needed

[cuspub]

Geea.

Only on the Cobra Stage 3 kit do we touch the wastegate.

To ensure better control and flow, we modify the wastegate 'pocket' and add a different actuator. That's about it.

By combining this modification with the Stage 2, adding an upgraded cat, high flow fuel pump, more boost but of course (around 1.1 bar max) and upgrading the engine internally (blueprinting, rods), you can have as much as Bcl (between 350 and 370 rwkW - depending on the dyno).

Greg Brindley.

Nizpro.

[aps]

Geea, Dont be conned into thinking that high exhaust back pressure is acceptable, it certainly is not :( . The fact that the stock Ford cat is failing at higher than stock power levels is due to the massive exhaust restriction and the excessive exhaust gas temperature which results.

As the cat converter is failing due to excessive temperature and back pressure at very low kilometers imagine how the pistons, exhaust valves, cylinder head, exhaust manifold, tubine wheel and housing are all going to be impacted upon, ( not too far down the track) which all see the extreme heat load due to the massively restrictive exhaust system.

Power is one issue though engine/component life is another issue which needs to be considered at the same time. To know that this elavated exhaust gas temperature and the extremely high exhaust back pressure exists and also knowing the consequent results, then failing to address the issue borders on negligence in my view. This is one of the main reasons that a huge low restriction exhaust system is part of the APS phase II system.

On the fuel pump issue raised we are well aware that when the stock Ford fuel pump is new and in perfect order it will support quite high power levels.

The real problem is that the stock fuel pump degrades in performance ( loses fuel pressure and fuel flow) over the first 1 to 2 years, when this occurs the engine will run lean air/fuel mixtures which will result in engine damage.

Fact is you can run a quick 1/4 mile time with the stock exhaust system, though it is the resultant engine damage which will occur over time that concerns APS, nothing more or nothing less.

Bottom line....high exhaust back pressure is detrimental to engine life!!

Peter

APS

[Guest]

Whats the story in 3 years with ford ,should I get a new fuel pump under warranty.

vik

[bcl]

Geea,

I choose a hi-flow exhaust before I did my Nizpro upgrade. It has a high flow cat, powder coating in front section, mandrel bent dual 2.5" exhaust, rebuilt rear-muffler, and retains the stock tip, so your car looks standard (unlike other exhausts that are easily picked). It is not expensive, around $1200+GST for forum members from my exhaust contact. So you don't have to pay a fortune for a good exhaust.

As for a fuel pump, I have a 550HP Walbro pump that is a simple in tank replacement. These are priced at around $365. fyi I attach a picture of where the fuel pump goes (the back seat is removed).

I hope this helps.

Brian

[geea]

Geea,

I choose a hi-flow exhaust before I did my Nizpro upgrade. It has a high flow cat, powder coating in front section, mandrel bent dual 2.5" exhaust, rebuilt rear-muffler, and retains the stock tip, so your car looks standard (unlike other exhausts that are easily picked). It is not expensive, around $1200+GST for forum members from my exhaust contact. So you don't have to pay a fortune for a good exhaust.

As for a fuel pump, I have a 550HP Walbro pump that is a simple in tank replacement. These are priced at around $365. fyi I attach a picture of where the fuel pump goes (the back seat is removed).

I hope this helps.

Brian

Wow, great info Brian.

Did you install the fuel pump yourself or was it installed with the Nizpro kit?

With the exhaust what would it cost to get it shipped to Melbourne and does it bolt straight in? Also are you able to buy seperate parts like say the cat and if sio will it replace the factory cat without any mods to the rest of the system?

Thanks Geea.

[aps]

Hey Geea, there is a lot to consider when looking at exhaust systems, you wont buy much in the way of a quality exhaust system for $1300 approx. :(

First of all the system should be constructed in 304 stainless steel, other wise the exhaust wont last long due to the high temperature generated at increased power levels on the xr6t engine. If the system is made in mile steel or aluminised steel the system will fail due to the continual expansion and contraction of the material. This is the reason why ford utilise a grade of stainless steel in the stock Ford xr6t exhaust system, all be it a lower grade than 304 S/S.

The same applies to the cat converter, if not produced from the best materials the cat will fail and fall apart prematurely due to the high heat loads, when it comes to purchasing a well spec'd cat converter it is certainly a case of buyer beware, all cats are not created equal.

Then of course there is the mandatory EPA noise limit to consider (90 db at 3900 rpm) and the emission legality issue, does the system meet the ADR 79/00 emission standard.

If you are pulled up by the law in Victoria or NSW, that is police, RTA, or EPA and you cant prove the above (and the ownus of proof is the responsability of the owner) you will be fined and forced to remove the exhaust system from the car. :banghead:

Food for thought, dont rush in ....consider all of the facts before you spend hard earned money.

Peter

APS

[Guest bossman]

Hi Peter,

I love the APS II kit, it's like nothing I have ever driven and even my mate who is a one eyed turbo gemini freak loves it and is jealous.

I am talking to the Minister for Finance about stepping up to the APS III, would you recommend valve spings and auto upgrades before or at the same time?

If so, what advice/packages do APS have on this?

Thanks again for your time and see you at C&V on the 27th March.

[geea]

Geea,

I choose a hi-flow exhaust before I did my Nizpro upgrade. It has a high flow cat, powder coating in front section, mandrel bent dual 2.5" exhaust, rebuilt rear-muffler, and retains the stock tip, so your car looks standard (unlike other exhausts that are easily picked). It is not expensive, around $1200+GST for forum members from my exhaust contact. So you don't have to pay a fortune for a good exhaust.

As for a fuel pump, I have a 550HP Walbro pump that is a simple in tank replacement. These are priced at around $365. fyi I attach a picture of where the fuel pump goes (the back seat is removed).

I hope this helps.

Brian

Hi Brian, after reading Peters last post I'm wondering what your system is made of and how the cat and the rest of the system is holding up? How long has it been on the car and what sort of back pressure does it have.

Peter, while on the subject, what sort of back pressure does the APS have. Does the XR6 Turbo need some back pressure or when getting to high power levels can it run with no back pressure?

Thanks guys,

Geea.

[aps]

Hi Peter,

I love the APS II kit, it's like nothing I have ever driven and even my mate who is a one eyed turbo gemini freak loves it and is jealous. 

I am talking to the Minister for Finance about stepping up to the APS III, would you recommend valve spings and auto upgrades before or at the same time?

If so, what advice/packages do APS have on this?

Thanks again for your time and see you at C&V on the 27th March.

Bossman, great to hear that you are happy with the APS phase II system, the power and torque is certainly additive, I drove a phase II ute on Friday and the rush you experience when you change from 3rd gear back to 2nd gear at full throttle is awesome :lol: .

The phase III upgrade will require stronger valve springs ( in fact we recommend the springs to be installed at phase II power level) and the auto will definitely need upgrading to cope with the phase III torque level.

We have a number of phase III cars running, testing one of the auto upgades we have now and we are continuing to develop an upgrade to cope with even higher torque levels. We may run a day in the future to cover the auto upgrade and other technical issues when we have final information and technical spec's settled.

Again thanks for the feed back on your phase II equipped xr6t, its always very pleasing to hear from a satisfied customer. By the way who did the install of the APS phase II system?

Peter

APS

Edited 09/03/04 01:23 AM by aps

[aps]

Geea, the APS full turbo back 304 S/S exhaust system has only half a psi presure drop at 280KW at the treads in shoot six mode. In addition the noise reading at the EPA specified RPM test speed is 87 dB, and the NVH at cruise speeds between 60 to 140 kph is very low, you could easily drive the car from Sydney to perth and get out of the car in good shape.

There is nothing worse than an exhaust system that has boom and drone at cruise speeds. With turbo engines the best possible back pressure is zero at max power, as back pressure in the exhaust really hurts power and turbo charger response time, and does create high thermal loads on internal engine components.

The higher thermal loads caused by elevated exhaust back pressure is very hard on the valves, pistons, and cylinder head and can dramatically shorten the life of the parts. High exhaust back pressure should be avoided like the plague.......it is a killer of turbo engines. :(

Peter

APS

Edited 09/03/04 01:22 AM by aps