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Post Info TOPIC: Shorty header pipe Fitted - Dyno before and after.


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Shorty header pipe Fitted - Dyno before and after.
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There has been a lot of talk about the benefits of the shorty header pipe on the TTR , but all the evidence anecdotal from magazines and rider impressions.

General consensus is a 2 hp gain with the shorty.   That's decent, about 10 % on a TTR. 

Recently Kiwi Jeff offered his opinion on his shorty header after he swapped header pipes back and forth, and I bit the bullet and ordered the TTR's Only pipe.   (Thanks Steve, came very well wrapped along with the other goodies)

Well its been fitted and run and tuned on the dyno.    Dyno runs were done with the standard header pipe and then the shorty.

I'm off to pick it up now.

Stay tuned, I will post up the dyno graph and give my riding impressions.

 

smile

 

 

 



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Ok, so on my bike, the TTR's Only shorty header pipe was good for an extra 1.5 hp on the dyno .

A quick spin in 3rd gear up the driveway and it feels like it now builds revs a lot faster, definitely noticeable and the bike feels faster.
Might have given up a little slightly off the bottom won't know until I take it on a decent trail ride.

21.5 HP to 23 HP. 7 percent increase with header pipe alone.



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TTR DYNO.jpg



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TTR250 header and plastics..jpeg



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Hi Kaos and others,

Well that pretty well stuffs my theory that the Shorty Front Pipe gave me the impression that there was more power at lower revs and confirms the mid-range theory.

Just a tip Steve, for the next batch of these that you get made, on mine it is very close to the frame, back near to where the joint is. Maybe your manufacturer could put in a little more bend or put a small dent it there. It doesn't hit the frame but it is very close.

I am also following Lyndon Poskitt on his Dakar journey, thanks to the link posted on this Forum a few days ago. I went back to the beginning and watched all the 10 minute "episodes."

I was wondering why his two mates weren't helping him with the bike at the end of a tough day of riding but now know that he is in the Class where he has to do everything himself. A great young guy with a top attitude.

I am abit "shaken and not stirred" at the moment as yesterday I got caught in a 5 car "Nose to Tail" on Auckland's Southern Motorway. I was in our Jeep Patriot and was in the middle of the mayhem and ended up sliding down the road on the left hand side. Once stopped I was out of there in a hurry because of a possible combination of fuel leak and sparks. Our poor Patriot will be a "Write Off" as several Air Bags deployed and that is a "car killer." We are fully Insured thankfully.

Cheers and lotsa beers

Jeff



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Jeff, thats not good news but the main thing is you are ok. Thats why we pay insurance I suppose.

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Yep... been saying that for 3 years now....
the motor revs quicker with the short header pipe...
mine dose also have a GYTR pipe aswell..



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20180120_204803.jpgGYTR pipe like this one?

 



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Excellent news Steve and thanks for going to the effort!

A nice easy way to get some extra ponies for your TTR plus I think the shorty pipes look great biggrinbiggrin

Brian

PS Sorry to hear of your incident Jeff. Good news that you are OK.



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no.. mine is the earlyer version that was made by scorpian for Yamaha..
they were realy loud...but i managed to fit a DB killer into it...



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This GYTR is actually pretty quiet at idle and small throttle openings, it shouldn't annoy anyone just putting around. But when you open it up it gets a loud bark and you can hear it going down the road or through the bush.

I don't if its the best muffler option out there but it seems ok and heaps lighter than the stock metal one.

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Annnnnnd I just bought a new mid pipe.

The dyno doesn't lie.



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Good news on the Dyno

Yours is in the post today Ben smile



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that looks really good . where can you buy them? we are trying to a little more out of the 03 ttr 250 my son is racing.



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The totallyttrs link above from Steve is where I got mine. The only known supplier too.

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Ben nabbed the last one, should be back in stock in a couple of weeks.smile



-- Edited by ttr steve on Wednesday 13th of June 2018 09:22:25 AM

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biggrinbiggrinbiggrinbiggrinbiggrinbiggrin



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thank you .



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lol its worth the wait. you guys have been such a big help. that extra 1.5 -2  hp that's a good increase  I am really having fun a the races . with the looks my son is getting on his 03 TTR250 when is getting his plaque .no 1st yet but we are getting closer.



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Ben.
Let us know your thoughts with the new shorty pipe.

I will share my thoughts next week. I will be out this Monday on the TTR I've been mainly riding the WR so I will give it my first full day test with the shorty out in the Victorian bush. My son has been riding it and reckons its goes well. Will be riding with fast blokes on KTM300's so should be interesting.
Sappershouse
The pipe is definitely an upgrade if u r serious about the TTR.
I love surprising the new bike riders too




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Was the dyno run the shorty with a standard muffler, or was it a shorty with the GYT muffler?

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Both runs were with the GYTR muffler so all the gain seen is from the shorter header pipe v the standard header.

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Kaos wrote:

Ben.
Let us know your thoughts with the new shorty pipe.

I will share my thoughts next week. I will be out this Monday on the TTR I've been mainly riding the WR so I will give it my first full day test with the shorty out in the Victorian bush. My son has been riding it and reckons its goes well. Will be riding with fast blokes on KTM300's so should be interesting.
Sappershouse
The pipe is definitely an upgrade if u r serious about the TTR.
I love surprising the new bike riders too



 Will do. All going well my ever so humble OE won't be quite as humble. 



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The 2hp probably comes from the combination of shorty and GYT pipe.

I wonder what the shorty would do with an OEM pipe.



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GraemeSydney wrote:

The 2hp probably comes from the combination of shorty and GYT pipe.

I wonder what the shorty would do with an OEM pipe.


No, the gain pictured on the dyno run pictured is just from the header pipe, the short header pipe compared to the standard header pipe.    Both runs used the same  the same muffler, in this case the GYTR muffler.

 

I would imagine a decent muffler would add another couple of HP over the standard muffler, independent of the header.    

 

 



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Not meaning to be argumentative but that is an assumption unless confirmed by the numbers of a dyno. 'Performance' pipes can, and often do, change the feel of power and move it in the power curve without adding HP.

From what you are imagining you could get 2hp from the shorty and 2hp from a performance muffler for a total of 4hp. I think that is an unsafe assumption. Mind you, I think the right combination might work together to give 4hp but coming from two different developers that would be a fluke rather than good engineering, and not every combination of performance pipe and shorty would not give the same result.

So it still leaves me wondering what the shorty would do with an OEM pipe.

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GraemeSydney wrote:

Not meaning to be argumentative but that is an assumption unless confirmed by the numbers of a dyno. 'Performance' pipes can, and often do, change the feel of power and move it in the power curve without adding HP.

From what you are imagining you could get 2hp from the shorty and 2hp from a performance muffler for a total of 4hp. I think that is an unsafe assumption. Mind you, I think the right combination might work together to give 4hp but coming from two different developers that would be a fluke rather than good engineering, and not every combination of performance pipe and shorty would not give the same result.

So it still leaves me wondering what the shorty would do with an OEM pipe.


 

Graeme,

I have to disagree with you.   A decent after market muffler shouldn't just move power around it should give a power gain, and in my experience more gain than the shorter header pipe.

I have never bought a performance pipe without getting an increase in power. (and I have bought a few)  I'd want my money back if I didn't get more power.

On my last bike, a 2007 wr250F which I only sold last year, I ran five different mufflers at different times: stock, YZ250F, DEP and Pro Circuit and Arrow.  All gave increases in power over the stock pipe to varying degrees, YZF the least Pro Circuit the most.  That bike was dynoed with the pro Circuit exhaust, I think it picked up 3 or 4HP.   I never got a print out on that one.   But that pipe was annoyingly loud I gave it to my son and ended up running an Arrow muffler which was quieter.   My other son scored the DEP.   The YZF is still in the shed with the stocker.   All the gains were noticeable whilst riding.   Just like on the TTR, the power increase with a decent muffler is noticeable.   I have had similar experiences with DRZ400s built for racing.

My 2015 WR runs an Akropovic muffler and the power difference from stock is amazing.   My sons 2016 WR250F, exact same engine, has the stock muffler is an absoluter slug in comparison.   I just big bored the 2015, that's even stronger now ;)  

Yes I have ridden the TTR derestricted with the stock muffler and it was ok.   The GYTR muffler it actually goes better.  My butt dyno said it had more HP.   Certainly wheelied and accelerated better.   And its better again with a short header.  

I don't know how the short header would work with the standard pipe I haven't tried it. Someone may have, hopefully they will chime in.

 

http://ttr250.activeboard.com/t64192586/october-1999-motocross-action-magazine-on-ebay/

This is a good read, Motocross Action built a TTR250 for racing in 1999 , extra 3 HP on a muffler alone, then an extra 2HP with the shorter header, total increase from 17HP stock to 22HP.   That's 5 HP with the exhaust mods.

That's pretty consistent with my experience building mine.  23.5 HP, 263cc, ported head increased compression.

 

Last month Leigh put a TK muffler on his bike and describes the power difference in this thread.

http://ttr250.activeboard.com/t64598571/new-exhaust-for-my-bike-need-some-recommendationshelp/

Cheers

Steve



-- Edited by Kaos on Friday 15th of June 2018 07:27:30 AM

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Okay received the shorty pipe today and fitted it up which was a pretty easy job.

I took the bike for a spin and was happy to discover that the bike pulled noticeably harder in the low to mid rev rang ie. the important bit. The TTR is now one very punchy 2 fiddy. Very happy with the performance gains and there is no denying that the pipe looks rather good too. Would highly recommend the upgrade to any TTR owner.


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Glad you got it so quick and are very happy with it.

Many thanks for the feedback smile

Steve



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Likewise I also endorse the shorty. Went out Monday for a full days ride in the hills. Was with 2 guys on KTM300's and kept up easy. Bike is strong. Pulls hard.
Did get stuck on one hill that was greasy. Might have overdone the clutch action a bit. It started shipping and hasn't come back.
So the 12 yo clutch is getting some love for next time.

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Funny you mention the clutch. I fitted a new clutch cable at the same time I installed the shorty pipe. I didn't realise just how bad the old one was until the new one was in. The clutch is now quite a bit lighter and it snicks into gear a lot better. I don't think the clutch could fully extend/release properly with the old cable. I kinda feel bad for using it as it was for so long.



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toss a rekluse exp from a wr/yzf250 in it...


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Like this one. Out of my old WR250F.  With the LHRB 20180620_195251.jpg



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confuseI can't decide between putting in the TTR or new WR.



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6071...yes thats it..... fit straight in....

Is that the left hand rear brake ?

set it up with the motor/oil hot...


..



-- Edited by petenz on Wednesday 20th of June 2018 11:26:28 AM



-- Edited by petenz on Wednesday 20th of June 2018 11:28:21 AM

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Yes Pete LHRB. How is yours going. Did you use all light springs or a combo in yours?. I had a mix of springs in my WR for engagement just off idle.

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Back on topic, here is how the shorty pipe looks on an OE TTR 250.

IMG_5276.JPGIMG_5278.JPG

 



-- Edited by Benjah on Thursday 21st of June 2018 12:48:24 AM

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Kaos wrote:

Yes Pete LHRB. How is yours going. Did you use all light springs or a combo in yours?. I had a mix of springs in my WR for engagement just off idle.


 yes have the light springs.. "red i think" and heavy clutch springs...

always wanted to try the heavy weights in it....

I made a adjustable clutch arm stop instead of useing the clutch cable

to set it...the cable was not consistant...now I can have free play in the clutch cable...

i have it set so finely that the  auto dosn't work on a cold motor to much oil drag... have to use it as a manual

till the motor/oil is hot...

Theres a picture of the stop in my TTR rekluse thread....

I have never had to open it up since i put the Rekluse in... 3 years now...

I ride a lot of forestry single tracks... its magic in the tight stuff....

 

 

.



-- Edited by petenz on Thursday 21st of June 2018 06:55:34 AM

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Thanks for posting the results Kaos ... been toying with the header pipe idea. confuse
Can anyone comment on whether re-jetting is needed for the shorty header pipe?

First I might just install an aftermarket end can, which off course will mean a re-jet, but assuming the shorty header pipe conversion would not need any further re-jetting? 

And for re-jetting, is the common consensus still as follows ...

Pilot Jet:
The stock pilot jet size is a 50; replace it with a 52.5 pilot jet.
NOTE: Use a Mikuni pilot jet with part number VM28/486. 

Main Jet:
The stock main jet is 137, replace it with a 140 small round main jet.
NOTE: You must run a small round main jet as the hex main jets hit the bottom of the bowl. The part number is Mikuni No. N102/221. 

Should really start a thread on my bike, to keep track of changes and tyres used (mileage etc.).   



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Nice tip on the VM28486 52.5 pilot jet.

I've been looking for a larger pilot jet to replace my size 50. I've just ordered one of these through an outfit called Rocky Mountain ATV, cost me around NZ $10 including delivery so not bad. 



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Well I got out for another ride today, in the hills near Avoca Victoria. 5 hours of single track an hills, only managed 54 km, it was all tight going. Awesome day, TTR went REALLY well, no problems chasing KTM300's through the bush.
I'm very happy with the performance now, its quick through the bush and accelerates and revs up quite quickly.

IMO the shorty is a winner. :) ;)

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