help: au xr8 170rwkw/low for the work done

gaz084 · 04-02-2010, 12:25 PM

Thats odd.......how do u know its 170rwkw was it tuned?

RG · 04-02-2010, 12:30 PM

It seems low but there are a number of reasons that could cause that, not the east of which is the dyno and the operator.

A test drive would be the only way to see if it has as much as it should.

sd1800 · 04-02-2010, 12:34 PM

It does seem abit low. I would expect 200rwkw in manual maybe 190rwkw in auto.

If it still has the AU1 XR8 19lb injectors it might be a conservative tune? Also the single 2.5" for a stocker is good but might be restricting the top end on a worked motor?

sd1800 · 04-02-2010, 01:16 PM

For an auto it wouldn't be far off 90k at the rev limiter.

As i said the 2.5" single exhaust would be good for low down torque but probably shaves a few hp off the top end. As you would know Dyno's can vary alot too.

Stattic · 04-02-2010, 02:52 PM

I reckon a single 2.5 is strangling it
remember high stalls make less power on the dyno generally

CFOUR · 04-02-2010, 10:06 PM

Sounds about right for an auto. Should gain 35ish kw with a manual conversion

CFOUR · 04-02-2010, 10:09 PM

Also- for the most part a larger cam will mainly add torque, kw gains will be minimal.

Ride · 04-02-2010, 10:23 PM

The stock cam isn't that far off what you'd find in a Series 2 200kw motor so I wouldn't be suprised, but for sure the exhaust is what's holding you back, even with the larger pipes the pacemakers have. I've got a single 2.5" system attached to a stroker and I'd be estimating I'm losing 20-30rwkw because of it, it isn't by choice but because of my financial situation.

Ride · 04-02-2010, 10:26 PM

Quote:

Originally Posted by CFOUR

Sounds about right for an auto. Should gain 35ish kw with a manual conversion

Not a chance. 20kw if you're lucky and are pumping over 230rwkw. Take a look at some of the dyno results between the T3 guys, while there is a difference you'd be hard pressed for a difference of 20kw between the lowest auto and highest manual provided the same exhaust.

CFOUR · 05-02-2010, 01:04 AM

You'll find that drivetrain loss is exaggerated with mods.

Also you're expected gains from a free flowing exhaust are optamistic at best.

illusivedreams · 05-02-2010, 02:02 AM

Quote:

Originally Posted by CFOUR

Sounds about right for an auto. Should gain 35ish kw with a manual conversion

Opimistic I would say,

Please note my opinion is not worth ******** when it comes to dynos.

CFOUR · 05-02-2010, 02:26 AM

Reguardless of dyno's the au xr8 automatic gearbox is garbage the t5 is a much better option. The t3 manual gearbox is not a t5 btw.

Dacko · 05-02-2010, 06:28 PM

I've just hit 170kwrw from a au2 fairmont ghia 175kw standard but with the following mods,ipv extractors into a 2 1/2 single right through,yella terra cold air box,and a custom dyno tune.

Dacko · 05-02-2010, 06:29 PM

Sorry and its a auto

SLO AU XR8 · 05-02-2010, 07:17 PM

For a start, the T/B is way too big. HP-F have been known to have less the acceptable tunes by some members here too.

Ride · 06-02-2010, 03:00 AM

Quote:

Originally Posted by Dacko

I've just hit 170kwrw from a au2 fairmont ghia 175kw standard but with the following mods,ipv extractors into a 2 1/2 single right through,yella terra cold air box,and a custom dyno tune.

Sounds about right, I pulled 147rwkw on an absolute stock 175kw motor. The intake and tune would have made the difference but a more free flowing exhaust would have given you a larger increase again esp. if the tune was done after the mods.

CFOUR: Well aware the T3's use a TR3650 manual box, if anything the drivetrain loss would be less than the T5 and increase the gap between the auto and manual. If the auto gearboxes are 'garbage' then why did Ford have to have the T5Z in the 220kw XR8 and then the TR3650? The T5 couldn't handle decent power whereas the BTR (although slightly different revisions) have been used with T3's making good power and the majority of the BA range.

xr8ute · 06-02-2010, 12:39 PM

The cam is small, and the intake is big, and the throttle body is really big....that combo is a real mismatch.

Its also hard to know just how well the GT40Ps have been ported unless you have a flow sheet for them?

Can you confirm which Trickflow intake it is? I would imagine its either a track heat (12.2" runners) or Street Heat/Street Burner (15" runners). Both only have a 75mm opening for the throttle body so i guess that was machined out for the 80mm throttle body.

IMO the street version with the longer runners would suit your combo better, but even better still would be the std Explorer intake and std 65mm throttle body.

Unless those heads have been incredibly well ported, then you are going to need a much larger cam to make 200rwkw.

Windsor220 · 06-02-2010, 03:06 PM

Quote:

Originally Posted by CFOUR

Reguardless of dyno's the au xr8 automatic gearbox is garbage the t5 is a much better option. The t3 manual gearbox is not a t5 btw.

True the autos are slower and absorb a bit more power but after a couple of mods to a standard 220 XR8 and your already over the T5s torque limits. Not a very strong box.

Stattic · 06-02-2010, 06:17 PM

Why spend so much money and buy a crap exhaust lol

Stattic · 06-02-2010, 06:32 PM

Why spend so much money and buy a crap exhaust lol

stavros68 · 06-02-2010, 06:53 PM

Change the injectors to 24lb

b2tf · 06-02-2010, 06:56 PM

Sounds about right for the mods you have listed. My old AU3 had a twin system, Alloy heads, 621371 cam, 70mm TB and intake and a few other things (it was based on a 200 motor) and only ever made 180rwkw - on the street it was a different story though.

b2tf · 07-02-2010, 01:58 PM

Quote:

Originally Posted by Blake_7

jeez i thought with twin 2.5'' inch exhaust,24lb injectors and a retune it would make 190-200rwkw but who knows

Most people on here have 'inflated' views of what kws cars should be putting out but they are only a number. I was so disappointed with mine when I saw it pulling those numbers - thought I'd wasted my money on stuff that didn't work well together and was bitterly disappointed - until I took it for a drive. Don't worry about the numbers - drive it before you pass judgement.

Stattic · 07-02-2010, 05:35 PM

bigger cam, bigger exhaust, retune?

RG · 07-02-2010, 05:53 PM

Quote:

Originally Posted by Blake_7

well all i took it for a drive and the mrs too seeing as though its her new daily, felt quick for what it was, hard to compare to my 290rwkw fg turbo but yeh it felt good so we put a deposit on it.

what to do first change injectors and do a twin 2.5inch exhaust and get it retuned or do 3.9 diff gears......

I'd make sure all ignition components are in order and then go squirters, exhaust and a tune.

xr8ute · 08-02-2010, 08:54 AM

Quote:

Originally Posted by Blake_7

ok so i spoke to the guy again the car is running a single 2.5'' inch exhaust and 19lb injectors with a soft tune

The soft tune is necessary becuase of the 19lb injectors. They would be maxed out.

Russ makes a good suggestion; check the condition of the ignition system consumables, change exhaust, change injectors for 24lb/hr and then retune.

Your tuner should be able to load a tune onto the box for you, in advance of changing the injectors, to flash as soon as they are fitted (you shouldnt drive the car with 24's if its still tuned for 19's).