Dyno result XU10J4RS

[rny 0]

Hi,

I need your expertis.

I run my car in dyno yesterday but I’m unsure if the result is ok or if it is something wrong?

It’s a new build standard XU10J4RS with throttle Bodies and Cat CAM 4903154.

And I got this result in the file.

The result is on the wheels.

 

[Tseize 0]

For me it does not seem to be a brilliant result regarding the peak power, however the plateau from 5600 rpm could be some kind of achievement.  

My opinion is based on the dyno results of my ex Mi16 ACAV with ported head (96.2 kW @ wheels; 90.2 kW in original state).

Did you measure it before the tuning?

[welshpug 1,682]

those camshafts are quite mild, is it standard pistons and ecu?

[petert 616]

It's definitely a bit low for throttle bodies. I get 106-110kW at the wheels on a standard inlet manifiold with similar cams. I'd be expecting at least 115kW (154hp) at the wheels. How much time did they spend mapping it? What ecu? Did they map the ignition as well? And why does it go flat from 5600? Is it leaning out? Do you have an AFR vrs RPM graph?

Edited June 5 by petert

[welshpug 1,682]

definitely something amiss with the curve as peter said, they shouldnt go flat like that,     have the cams been dialled in?

 

here's my ZX with stock gti6 other than Newman PH2 cams, which are a little more lift and duration than the catcams used above, stock ecu no map, stock cat and exhaust.

 

155 bhp wheel, 176 bhp flywheel,   125 lbft wheel, 141 lbft flywheel.

 

img015 by WELSHPUG, on Flickr

[rny 0]

It is standard Pistons and nothing made to the head. Only  Cat Cams, throttle bodies , lightened flywheel and a MaxEcu.

 

I don’t think they put alot of time testing in the tuning but I know they tried with the ignition with no better result.

 

Maybe I need to check the ilignment of the cams?

 

 

[welshpug 1,682]

that would be the first step yes, 

[Tseize 0]

On 6/5/2025 at 10:41 PM, welshpug said:

definitely something amiss with the curve as peter said, they shouldnt go flat like that,     have the cams been dialled in?

 

here's my ZX with stock gti6 other than Newman PH2 cams, which are a little more lift and duration than the catcams used above, stock ecu no map, stock cat and exhaust.

 

155 bhp wheel, 176 bhp flywheel,   125 lbft wheel, 141 lbft flywheel.

 

img015 by WELSHPUG, on Flickr

Just for the curiosity: how much power did your original setup have?

[welshpug 1,682]

presumably 167 bhp, given that's what they make standard!

 

 

well specifically the car left the factory with the 155 bhp RFY, but that span a rod bearing...

 

 

that car went on to make 200 bhp at the flywheel on throttle bodies with no other changes bar the ecu.

[Tseize 0]

55 minutes ago, welshpug said:

presumably 167 bhp, given that's what they make standard!

 

 

well specifically the car left the factory with the 155 bhp RFY, but that span a rod bearing...

 

 

that car went on to make 200 bhp at the flywheel on throttle bodies with no other changes bar the ecu.

Did you miss the positive effect of ACAV on the mid-range torque after the swap?

[welshpug 1,682]

no, the gti6 made more torque and for longer.

[Spesh 33 1 Cars]

Image (4) by Mark Needs, on Flickr

 

 

That was mine on a bone stock and tired engine with Jenvey 48's and speeduino ECU.

[Tseize 0]

On 6/10/2025 at 2:13 PM, welshpug said:

no, the gti6 made more torque and for longer.

Besides other ideas I am thinking of a XU10J4RS conversion (= intake + exhaust manifold from RS to an RFT) therefore I searched for dyno result of an original XU10J4RS. I found only one. That engine did not seem to be too powerful (~145 BHP at flywheel?), so I am confused:

  

[petert 616]

That’s kW at the wheels. That’s the way we do it in Aus. No fudgy conversion factors to estimate flywheel hp. A decent std GTi6 would typically pull 92kW. 

Edited June 13 by petert

[Tseize 0]

1 hour ago, petert said:

That’s kW at the wheels. That’s the way we do it in Aus. No fudgy conversion factors to estimate flywheel hp. A decent std GTi6 would typically pull 92kW. 

Yes, I know that it is at the wheels. But it is not a good value IMHO. My old ACAV could achieve 90.2-90.6 kW @ the wheels (on 2 different dynos).

[petert 616]

Here you go.

[welshpug 1,682]

quick google and mine made 115 kw at the wheels with the gti6 and Newman PH2 cams, I think my 2.0 405 mi16 made 100kw at the wheels.

 

torque was 195 vs 182 Nm.

[Tseize 0]

I searched for it  Your Mi16 made 83.5 kW (113.6 HP) ATW.

  

 

 

Mine performed better, I mean it produced practically the same ATW figures (at least regarding the peak power and torque) as a standard GTI6, and that's why I am confused a bit with the benefit of such a conversion (only intake- and exhaust manifold + GTI6 injectors (+ remap would be necessary for sure)) 

My RFT engine finally achieved 96.2 kW ATW after a simple headwork but without big valves or remap.

[petert 616]

12 hours ago, Tseize said:

Besides other ideas I am thinking of a XU10J4RS conversion (= intake + exhaust manifold from RS to an RFT)

 

I wouldn't bother trying to fit an RS exhaust manifold to an RFT/RFY/D6C/DFW head. The port spacing is very different and requires a substantially thick adaptor to keep the port flow acceptable. There is an example I made on this page:
http://www.taylor-eng.com/conversion/conversion_parts.htm

 

You'll get a far better result with a quality aftermarket 4-2-1 long tube manifold.

Edited June 14 by petert

[welshpug 1,682]

this thread isnt a discussion about converting an S16/Mi16 to gti6 manifolds, nobody  mentioned that but you @Tseize

 

its about a gti6.

[Tseize 0]

I am sorry. I stop to hijack this thread.