header / max boost ?

[JPS]

Well i got to ride my sled finally for the first time Saturday and Sunday in Ontario got to put on a bit over 400 miles in the 2 days with the TD header. My set up is Max 16 with stock muffler BOV, CAI, 2 bar all thunder products clutching and XS 825 belt. got to compare it to same sled without header. first off what i noticed the muffler is running hotter with the header, it was warm, 32 degrees all weekend but more heat from muffler on sled with header. it was told to me to be power increase bottom to top but i did not find that, less than 1/2 throttle seemed no different than stock manifold but once the motor got near 7,000 RPM's, there was a very noticeable harder pull to the motor. the sled with stock manifold was pulling 8800 to 8900 RPM and with the header and 2 more grams of weight on the tips of the Heavy Hitters the sled was going to 9250 so it was really making some power. with the stock manifold i was getting 16.4 boost and with the header 15.8? seems odd i lost some boost but was making more power. we were only able to go head to head for about 1/4 mile, its all conditions would allow between other sled traffic and a safe enough space to go any faster and the stock manifold and header sleds were close for almost 500 feet then the header started to walk away at 1/4 mile it was about 4-5 sled lenghts and the header sled was still pulling hard and wanted more space. I am not sure but the feeling i get from riding is the sled with the header may be running a bit rich and any tune running a header may have to be updated to dial it right in? I did not hear anything from TD but they did say testing that thought. So this is how my sled responded, i wish i gained some low end but it feels very much like the stock manifold up to half throttle, maybe i can play a little with clutching set up to get more response on low end but have no snow anywhere near me to ever be able to try anything or maybe TD will make some changes to tunes running a header to broaden the power curve? Is it worth $800??? i cant say, what do i know? all i can say is the header with Max16 is more powerful that stock manifold.

 

[ClutchMaster]

Well i got to ride my sled finally for the first time Saturday and Sunday in Ontario got to put on a bit over 400 miles in the 2 days with the TD header. My set up is Max 16 with stock muffler BOV, CAI, 2 bar all thunder products clutching and XS 825 belt. got to compare it to same sled without header. first off what i noticed the muffler is running hotter with the header, it was warm, 32 degrees all weekend but more heat from muffler on sled with header. it was told to me to be power increase bottom to top but i did not find that, less than 1/2 throttle seemed no different than stock manifold but once the motor got near 7,000 RPM's, there was a very noticeable harder pull to the motor. the sled with stock manifold was pulling 8800 to 8900 RPM and with the header and 2 more grams of weight on the tips of the Heavy Hitters the sled was going to 9250 so it was really making some power. with the stock manifold i was getting 16.4 boost and with the header 15.8? seems odd i lost some boost but was making more power. we were only able to go head to head for about 1/4 mile, its all conditions would allow between other sled traffic and a safe enough space to go any faster and the stock manifold and header sleds were close for almost 500 feet then the header started to walk away at 1/4 mile it was about 4-5 sled lenghts and the header sled was still pulling hard and wanted more space. I am not sure but the feeling i get from riding is the sled with the header may be running a bit rich and any tune running a header may have to be updated to dial it right in? I did not hear anything from TD but they did say testing that thought. So this is how my sled responded, i wish i gained some low end but it feels very much like the stock manifold up to half throttle, maybe i can play a little with clutching set up to get more response on low end but have no snow anywhere near me to ever be able to try anything or maybe TD will make some changes to tunes running a header to broaden the power curve? Is it worth $800??? i cant say, what do i know? all i can say is the header with Max16 is more powerful that stock manifold.

Glad it’s working out for you! Maybe a modified muffler would bring down your muffler temps?

 

[0degC]

Glad it’s working out for you! Maybe a modified muffler would bring down your muffler temps?

Noticed the same as JPS. Very mild last weekend riding and underhood temp significantly increased with header into a mod stock muffler. freer flowing muffler would be better. Just so much heat coming directly off header, need more venting.

 

[Turboflash]

9,250? Is that where that tune's peak HP is? (My Stage 4 PEFI tune (PM) peaks at 8900. If I were to run 9250 I'd be down about 6 HP already).
I added some additional venting both to front side and rear of panels. I'm always amazed at how much heat is coming out of the rear vents. I can feel it cooking my legs. LOL

 

[0degC]

9,250? Is that where that tune's peak HP is? (My Stage 4 PEFI tune (PM) peaks at 8900. If I were to run 9250 I'd be down about 6 HP already).
I added some additional venting both to front side and rear of panels. I'm always amazed at how much heat is coming out of the rear vents. I can feel it cooking my legs. LOL

What did you put for extra venting on exhaust side front/back? Do you feel it helped? Have any pictures. Just looking for idea's. thanks

 

[Turboflash]

I just feel like it can't hurt, right? Again, you should feel how hot the heat is coming out of the rear vents. First of all, I heat-insulated everything I could (on exhaust side) to keep exhaust heat out (of engine and even oil lines) to begin with. You can get this adhesive-backed product from most auto parts stores. Will stand up to 2000 degF. Note I put it on magneto cover, oil lines, oil tank, etc. Again, want to keep muffler heat out of anything I can. Then I added side-panel vent in front and rear.

 

[JPS]

9,250? Is that where that tune's peak HP is? (My Stage 4 PEFI tune (PM) peaks at 8900. If I were to run 9250 I'd be down about 6 HP already).
I added some additional venting both to front side and rear of panels. I'm always amazed at how much heat is coming out of the rear vents. I can feel it cooking my legs. LOL

No, 9250 is a bit too much, i was only stating that adding the header was making power. my sled was dialed in very good clutching before i installed the header with RPM between 8800 and 8900. after installing the header and adding 2 grams of weight to my Heavy Hitters i was still going to 9250. the 2 grams i added was not enough to keep the RPM at 8800 - 8900.

 

[ClutchMaster]

That’s awesome nice work! Looking forward to seeing the final product!

Welded and wrapped, just needs a heat shield and I’m done!

 

[snowcaine]

View attachment 152888 View attachment 152889

Welded and wrapped, just needs a heat shield and I’m done!

Nicely done that is awesome!

 

[@123]

yes I have , I had to adjust my fuel pressure from stock 43psi to 48psi to lower my a/f to be safe , yes the header flows more air , this all works great , very easy , the issue is the boost now , apparently you won't see over 17-18 psi boost , being that said max19 or max 20 is useless un less u lock your waste gate , ill be back on the snow this weekend and try it to see , let us no what u see at max 20 once u get a chance ?

have a question about waste gage locker how you adjust it to have like 1 lbs more with max 20 and headers? is there a measurement? thks

 

[0degC]

have a question about waste gage locker how you adjust it to have like 1 lbs more with max 20 and headers? is there a measurement? thks

It’s likely not the best idea screwing with locker (and 20lbs boost) without some C16. That being said you could start at 80-100 tho, measure between locker bolt and waistegate arm. Do some short pulls and monitor boost. Not an exact science all sleds a bit different.

 

[Turboflash]

C16 or C12 a must IMO.

 

[ClutchMaster]

It’s likely not the best idea screwing with locker (and 20lbs boost) without some C16. That being said you could start at 80-100 tho, measure between locker bolt and waistegate arm. Do some short pulls and monitor boost. Not an exact science all sleds a bit different.

You really don’t need C16 for 20 psi, that’s not much Boostin at all. Straight C16 can handle 50 psi. Just get some 110 or 112 octane fuel and mix it 50/50 with pump, then you could pretty much lock that wastegate closed.

 

[@123]

It’s likely not the best idea screwing with locker (and 20lbs boost) without some C16. That being said you could start at 80-100 tho, measure between locker bolt and waistegate arm. Do some short pulls and monitor boost. Not an exact science all sleds a bit different.

so you mean like 1/8” of an inch from the pivot should be safe for start?

 

[0degC]

You really don’t need C16 for 20 psi, that’s not much Boostin at all. Straight C16 can handle 50 psi. Just get some 110 or 112 octane fuel and mix it 50/50 with pump, then you could pretty much lock that wastegate closed.

Your not wrong at 20psi, actually 94oct is good. Point is some c16 and overkill on the octane is good for someone experimenting with a waistgate lock.. he is not going to be sure at 20psi.