FX450 dyno

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Alan

Alan

Joined
Jul 14, 2016
Messages
596
Location
Australia, Beechworth, Vic.
I had the 450 dynoed today.

57.0 HP

Wossner 11.8:1 piston kit, 8 thou off the base of the barrel to achieve approx 13.0:1 CR, 570 cam, Barrett end cap on the muffler, seat and radiator shrouds cut back to open up the airbox.

The first run was done with the standard FX ECU. It achieved 57.0 HP. The Vortex ECU also achieved 57.0 HP. The difference is the AFR's.
 

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Could someone with some knowledge give some input?

Looking at the AFR's, the sole blue line is with the std FX ECU. The rest is with the Vortex from my 570.

The FX ECU looks a tad lean but usable on the track where it will be working hard in the upper.

The Vortex looks very rich.

Would this thinking be right?

Thanks guys.
 
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I have studied the graphs a little more and what I have forgotten to do which could have achieved a little more was I forgot to fit the map switch for when the FX ECU was fitted, so it ran in the STD position.

It will be interesting to see how it performs with some increase in fuelling.
 
Whoa!

That's quite something. Impressive, and very useful info. Thank you.

Hey - With that compression ratio, what fuel do you run?
 
tourist said:
Whoa!

That's quite something. Impressive, and very useful info. Thank you.

Hey - With that compression ratio, what fuel do you run?
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Not bad for some cheap/easy mods.

98. It may run fine on 95, I'm not sure. 98 is expensive but I only run this on the track mostly.
 
Apparently timing isn't an issue with the 570 cam???
Very impressive numbers. Any torque numbers?

Congrats on the results.
 
RogerB39 said:
Apparently timing isn't an issue with the 570 cam???
Very impressive numbers. Any torque numbers?

Congrats on the results.
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No torque numbers provided Roger. I can tell you though, it's not lacking at all anywhere in the rev range. Last week I had it out bush with the off-road wheels fitted and it was beautiful. Was better than my 570 in the single track.

Timing as in dialling in or numbers? They don't have prevision for dialing in but the cam specs from my understanding is the inlet numbers are the same as the 450 but longer duration in the exhaust. One day when I get a chance I'll check the specs of this cam. It a used 530/570 cam. It's a simple/cheap means of a cam upgrade for the 450.
 
I had the 450 do a rerun on the dyno as I fitted a piggy back tuner the original FX ECU.

It picked up a tad over the Vortex but an oh so much nicer curve. These tuners do a good job.
 

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its my understanding that the 450 and 570 cams make different power curves have different lift and duration and what you gain with one you lose with the other.

Taffy
 
When I get a chance I'll check the profile of at least the 570 cam.

The specs of this bike in its current form was suggested by the builder of the 70 deg Bergs for the Australian Safaris.
 
I received info from Jens at Husaberg while researching for the 570 engine I tuned, difference between the cams is the 450 have shorter duration exhaust lobe else very very similar, Ive got the notes on another puta if you need the details.
 
TomTom said:
I received info from Jens at Husaberg while researching for the 570 engine I tuned, difference between the cams is the 450 have shorter duration exhaust lobe else very very similar, Ive got the notes on another puta if you need the details.
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Yes I have heard the same, plus a little lift.
 
It is from the horses mouth, first hand info. Its mariginal lift difference, like 3 tenths of a mm, I would think dialling the cams differently will give more than each cam will. I do a lot of cam timing on other marks of bikes.
He also said the bottom end will take anything, just dont push the valvetrain further.
Info from Jens the developer of the 70 degree engine and his tech companion.

Alan said:
Yes I have heard the same, plus a little lift.
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TomTom said:
It is from the horses mouth, first hand info. Its mariginal lift difference, like 3 tenths of a mm, I would think dialling the cams differently will give more than each cam will. I do a lot of cam timing on other marks of bikes.
He also said the bottom end will take anything, just dont push the valvetrain further.
Info from Jens the developer of the 70 degree engine and his tech companion.
Click to expand...

Re dialling in the cams - I used to play with cam specs, dialling in etc back in my Chevy days. Still got some bits sitting around here somewhere.

How do you dial these cams with a fixed gear? Lower gear by woodruff key I suppose?

Dialling can shift the timing but not increase it, which you'd be aware of. Dialling the 570 cam would be better again with a fully specked cam the ultimate of course.

What I was trying to achieve was some improvement on the cheap. It was a cheap bike with hours on it and for this bike I only have a small budget. No high comp piston, just a std comp piston with 8 thou off the cyl base. A used 570 cam for $80 etc. modified original muffler, cut back seat and shrouds and a piggy back tuner. Between you and me I didn't even dissasemble the head. Didn't have time for that. 57.3 HP turned out ok for a cheap hopup.

The other thing with this setup is it's spread. It has beautiful power/torque across a broad band. Really is a nice motor.

My past experience has shown that you can get a lot out of some shift in cam specs without the need to be too radical in increasing duration/lift which is what is hard on the valve train. Efficiency by numbers.

I'd be more interested in increasing the efficiency of the 570 by cam rather than my 450 as this needs more attention. Specs that would bring up the top end without sacrificing the bottom.
 
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Slotted screw holes is the common approach, or make a pattern of offset holes with known spread is the other, jungle jimmy approach is jumping a tooth :cool: You can use offset keys too yes.
I used to have a Honda CRF that I tuned and put a web camshaft in, and if you offset it a tooth it was spot on advertised :)
On the 570 head gas exchange is the bottleneck, had my heads ported and seats recut by Peter at FP tuning and it did an isolated 8hp, which is a lot from 565cc, but he knows exactly what to do on the other hand.

I put my 450 exc on the dyno just for fun, it has the same head as the husa 70 degree 450/570 and bone stock it spat out 50 sae on the rear wheel with a SM tyre on the DJ250 dyno I use, it was still dirty from riding and sparks flew from stones being chewed at the sprockets, good heads yes!
 
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Tom, would you mind elaborating on the the 'gas exchange' please? Are you saying the head/ports are ok for the 450 but restricted for the 570?
 
I'm not answering for Tom, but as it's the same throttle body, exhaust and head on 390, 450 and 570 it makes sense that the 570 would like to breathe a bit more than it can.

If you read maKe's thread he also concludes that the intake is what restricts the 570 engine.
 
The 390 came later so the head was either developed for the 450 or 570. Well actually they were a KTM head so most likely the 450. It doesn't necessarily mean the head will be too restrictive, but is sounding like it maybe when we start ask more of it.
 
he didn't say the head, he said the intake. get a CRF throttle body and see what happens

Taffy
 

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