what is the best positition for a wastegate..
i was thinking coming out of the center of the collecter, kinda like inline pro's

 

For those above who care, even at the 500+ whp level, you will not notice any differences between a equal length and non equal length manifold unless the runners are over 30 inches long. Period. Even on a dyno. Or at the track. Harmonics just have no effects in runners that are 12 inches long. Just more places to crack. Go with the easier, strongest design.

 

... thats not what ffgeoff says...

 

Ask people who don't make money off of it. 30 inch runners or no harmonics, thats life. Don't waste money on unnessecary crap.

 

that manifold is Geoff's first manifold when he left Maxrev I think...I think it'll work great

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Paul_Vang &raquo;</TD></TR><TR><TD CLASS="quote">that manifold is Geoff's first manifold when he left Maxrev I think...I think it'll work great</TD></TR></TABLE>

Thats what I was just going to ask...I remember when he posted pics of it after he made it. Looks nice to me

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ItsStockOfficer &raquo;</TD></TR><TR><TD CLASS="quote">For those above who care, even at the 500+ whp level, you will not notice any differences between a equal length and non equal length manifold unless the runners are over 30 inches long. Period. Even on a dyno. Or at the track. Harmonics just have no effects in runners that are 12 inches long. Just more places to crack. Go with the easier, strongest design. </TD></TR></TABLE>

what data do u have that supports ur theory?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by dmotoguy &raquo;</TD></TR><TR><TD CLASS="quote">i think the plan at the moment is to build about 20 manifolds that resemble the one i have pics of, but with a different wastegate placement. then in a few weeks or so try to do a equal length that keeps a/c</TD></TR></TABLE>

i will be in the market for a new manifold soon... i'd like to see what you come up with...

 

LOL, don't give me the burden of proof. You have the shop claiming:

"Equal length designs, increase spool time by approximately 800 rpm, huge midrange and peak power and torque gains. " Right....Maybe over a badly designed, log style, small diameter runner manifold....

I have seen plently of cars waste money on this. The gains from a good flowing manifold to a good flowing equal length manifold I have seen have been nil. Perhaps the manifolds that were switched too were not well designed but...I just think that harmonics don't have a whole lot of room to really take affect in 10 inches. The back pressure from the turbine is almost directly on the head regardless or individual runner length. You want to make some outrageous claims Id like to see YOUR proof that its a decent use of money, otherwise, every car Ive seen makes just as much power On a nice unequallength mani.

 

please do not jack this guys thread, this guy is trying to help and hook us up. take your concerns elsewhere.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ItsStockOfficer &raquo;</TD></TR><TR><TD CLASS="quote">You want to make some outrageous claims Id like to see YOUR proof that its a decent use of money, otherwise, every car Ive seen makes just as much power On a nice unequallength mani.</TD></TR></TABLE>

https://honda-tech.com/zerothread?id=307929

 

Id like to see pics of the manifold they switched from and to. I bet they are not of nearly Identical qaulity, or the new manifold has runners longer then 15 inches.

 

to say that exhaust pulses/harmonics dont contribute to turbine performance is wrong. here's some proof as stated by an engineer at Garret Engine Boosting Systems:

"As for primary lengths on turbo headers, it is advantageous to use equal-length primaries to time the arrival of the pulses at the turbine equally and to keep cylinder reversion balanced across all cylinders. This will improve boost response and the engine's VE."

i can find more if u want

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by ItsStockOfficer &raquo;</TD></TR><TR><TD CLASS="quote">Id like to see pics of the manifold they switched from and to. I bet they are not of nearly Identical qaulity, or the new manifold has runners longer then 15 inches.

</TD></TR></TABLE>

according to your first statement "you will not notice any differences between a equal length and non equal length manifold unless the runners are over 30 inches long. Period"

so which one is it 15 inches or 30?? the full-race manifold is 14inches and trust me it makes more power over the log style manifold.

 

I meant alot longer then 15 inches, I am stick with around 30 to get real harmonic power gains. 2 feet might do it. And Im certainly not comparing it to a log maniold. thats a whole different problem. They flow like complete crap. The first manifold pictures in the thread would flow very well, just not be equal length.

Sean

 

to say that exhaust pulses/harmonics dont contribute to turbine performance is wrong. here's some proof as stated by an engineer at Garret Engine Boosting Systems:
"As for primary lengths on turbo headers, it is advantageous to use equal-length primaries to time the arrival of the pulses at the turbine equally and to keep cylinder reversion balanced across all cylinders. This will improve boost response and the engine's VE."

i can find more if u want


******* duh. Everyone knows that, its not a question of whthr its true or not, its a question of when the gains become apparent and out weigh the additional cost of having them created. I Think in a shorty style manifold, as long as it flows well, it will be fine. I think harmonics can create trmendous gains in power when you have long runners...at least 2 feet, maybe 30 inches in length. But i kow what harmonics is and does.

 

if you made that manifold and did the WG on top, id buy it

 

i made that first manifold, and it did not flow nearly as well as one of our current manifolds. It iss not so much the harmonics that cause the power as it is the equal pulses into a properly designed merge collector.

I dont care to get into a pissing match, if you dont like well designed manifolds, i couldnt care less. Spreading misinformation because you have limited experience and are strongly misinformed is the part that irks me. Try to spend time researching, not spouting off BS. If these manifodls didnt make power, i wouldnt be making/selling them. Id be off getting a real job with my engineering degree.

BTW to the original poster, thanks for not being another copycat, ive got enough. Id love to see another company come out with a good quality manifold.

 

putting the gate on the top negates any effect of a collector, it essentially becomes a log manifold.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by FFgeoff &raquo;</TD></TR><TR><TD CLASS="quote">putting the gate on the top negates any effect of a collector, it essentially becomes a log manifold.</TD></TR></TABLE>

is there a way to mount it and keep AC that will not conflict in this way?

 

maybe

 

ya, i wasnt going to put it in the middle of the collecter, i am going to try to figure out a way to keep the same basic design with A/C.... it shouldnt be too hard to figure out, i'll just need to use a friends car as a tester...

 

... does anyone have any suggestions on the wastegate placement, would it cause creep or hurt flow to do it off of just one of the runners? or should i just have it do a bend right off of the front and have it mounted horizontally...

 

blah blah blah blah blah blah

 

make somethign decent for the H series guys and I bet it would sell pretty well. We have almost zero options for a good street design that allows you to retain all the normal stuff (a/c, PS).