Swapped to RC8 Intake trumpets

[Peanuts]

In UK they are only £1.80 each less 15%, so same price as a litre of fuel :)

where do you guys get $10 each from, according to KTMTalk shop online.....

Part Number:	61241040000
Description:	INTAKE TRUMPET 08
Retail:	$5.40
Your Price:	$4.59 (15% discount)

[kevxtx]

You do need to file down the locking in lug where it locks into the throttle body for easier fittment, they do make a nice difference. The Dual velocity stack with RC8 stacks will be for sale soon off the SD forum.

RC8 Stacks.



Photo of the RC8 stack left, standard stack right.



You can have the best of both worlds with a longer inner stack + RC8 stack.

[bikyto]

Which DNA box is that?

And where to you find these inner stacks?

This is endless. Eheh do they have inner inner stacks too

Looks nice though. How is it working for you?

[kevxtx]

MK3 air box & I made the DVS myself, you need the high roof to run the Dual velocity stacks, the standard MH air box roof is to low, but there is a mod for that coming so the MH will work with the DVS. I will be do further Dyno testing with the RC8 + DVS on Thursday to see if they are any proven gains using the DVS.

[bikyto]

Originally Posted by kevxtx

MK3 air box & I made the DVS myself, you need the high roof to run the Dual velocity stacks, the standard MH air box roof is to low, but there is a mod for that coming so it will work with the DVStacks.

who makes that mod?
Thank you

[kevxtx]

Mrz32 on the SD forum will be selling them, I have been helping him out with Dyno testing & building my own on the side trying different versions to see what works best, they will be for sale very soon through Mrz32. I will post the RC8 stack + DVS results if anyone is interested after Thursdays Dyno tests, I will be doing some power runs, standard stack + DVS / RC8 stack / RC8 stack + DVS, I will then build a custom single cylinder map with the best performing combination of stacks to see the final gains.

The last Dyno results from my SMR (below) after building a single cylinder map using a PCV in GREEN & then fitted the inner DVS in RED 5 min later. As you can see by only fitting the inner stacks I gained nearly 5 HP + exta torque everywhere, if I built a custom map with the DVS it would show more gains the A/F ratio ran richer with the DVS fitted.



This is the DVS fitted to the standard stack V RC8 stack, I later cut the fins shorter to match the RC8 stack.

[bikyto]

That's pretty impressive... That's for the info!

[kevxtx]

They will be out for sale soon so keep an eye out on the SD forum in a few weeks time.

Hopefully the RC8 + DVS stacks will show improved results over the standard stack version.

Fitting the RC8 stacks by themself does feel stronger above 6000 as mentioned in this thread, a well worth mod for the cost if you rev your bike over 6000rpm a lot..

[bikyto]

Yes it's more appropriate for SD/RC8
But the torque output is interesting.

[Kenbike]

It will be interesting to checkout the DVS and the air box height mod. The horse power out put of the LC8 is so much lower than the other 1000 cc bikes such as the RSRV, or SV1000 it just begs to get up in the 115 to 120 hp range.
I still might pull the heads next winter and get a good port job to free up the flow.

[kevxtx]

The Dyno results.

http://www.ktmsmt.com/viewtopic.php?...p=13218#p13218

[cjracer]

Originally Posted by Kenbike

I put a 150 miles on the bike today with the new RC8 trumpets and it was the best my bike every ran!
It does not pull a lot harder than the stock trumpets but it is so much smoother. I could let it down to 2200 rpm in 6th and it just purred along. May be it was running slightly rich and the RC8 trumpets flow more air so it leaned it out slightly.
So it was the best $20 I every spent on my bike

That's cool. I wonder how something like this for the 950s would work.

I have many sets on the way to start experimenting. Anyone looking for more, let me know.

[Kenbike]

I sure they will have an effect. I notice on the link to the SMR testing they found the RC8 stack did lean the bike and that is what I suspected on mine. So it you are running slightly rich it may show a positive gain and lean it slightly. It would be fun to try with a dyno and experiment.
I can remember a guy down the street in the 70's that race a Ford Farlane and he had a big block with 8 chrome velocity stacks sticking thru the hood, very cool look.

[mousitsas]

Let me be the devil's advocate, all in a good spirit!

What type of dyno has shown these results? Inertial or with a brake?
Also, when it comes to measuring torque on a dyno, I trust a lot more measurements taken on top gear with a large force on the brake and the throttle opened very slowly, ie pseudo-statically, than lets say WOT on low gear.

It is a whole different matter to measure acceleration then derive torque from acceleration characteristics, than measuring torque at almost static revs. I give an example. I used to ride a modded R1150GS, properly chipped etc etc. I had two pairs of stacks, a set of long and narrow and a set of short and wide. Acceleration on the road on the lower gears was better with the short ones, but on the high gears there was no contest. Same when driving uphill with luggage and passenger. The more the load was, the better the (low power) long stacks were performing when it came to acceleration.

[kevxtx]

Dyno testing done on a Dynojet 250i with load control. Sorry forgot to answer which gear, runs done in 5th gear.

Long & short stacks have been well documented over the years what they give & take away on different motors, from my past experiences every motor I have played with the stack heights have behaved differently to stack height changes, but there is hardly any documentation or testing been done on long & short stacks combined on these 990 motors.