Just clearing things up here, what i meant was both APS and Buschur manifolds look really well made that you'd almost think it's made by Mitsubishi. So i wasn't actually suspecting genuiness of your products.

 

Here's something different. Goto my thread Check Out My Custom Header and Turbo to see atachment.

 

cast manis are bullet proof... the real, race after race bolt up and forget it kind of bulletproof. that is why the top dragsters use cast manis.

is shearer gonna be makin' this mani in a cleaner form, cuz damn it looks ugly i'm sure if you guys sourced the right pieces and did less rushed welding that thing could be smooth as glass.

i'd say a longer runner in a turbo car is gonna get you more torque because torque is made by exaust gas velocity. the turbo is capping that but if the mani coming straight off the motor can delay the exhaust pulse from hitting the turbo, more torque will be produced. and for a similar reason: in turbo charged cars the exhaust pulse is pressurized, so it is less important for millimeter accurate equal length scavenging, it's more important to let the exhaust pulse expand fully before it hits the turbo less it hit the turbine in an awkward way while expanding and create unwanted backpressure.

the faster a gas moves is not based on the mani design but how pressureized the exhaust pulse is maybe your rpms.... also... the faster your pulses are moving the more pulses will be traveling and now that i think of it... how would your pulses travel any faster than they already travel... any faster and they'd create more vacuum slowing them down or expedite the next pulse's travel which brings me to the next point.... faster pulses = more pulses = more heat. which is the same reason why when you rev high that mani gets red.

i don't see why people don't talk about the aps mani more, prolly cuz it's not able to fit t3 turbos, or that it only fits their own turbos, or... no one has one. but in any case, i think they got the best idea goin' on. cast with long runners... bullet proof with the benefits, that sounds good to me. and if my friends have told me correctly, there is something like that made of inconnel coming out soon.

i think it would be more important to see the whole dyno graph on this one. the torque gained could be more significant than a peak number can illustrate. faster boost up doesn't mean faster power put to the ground, making more torque is more important for the real world racing. though it is absolutely true that spool up is faster with shorter runners, simple fact that the gases get there sooner. that's why it has to be a perfect balance between maximizing torque and maximizing spool, it's always harder when you have these two variables that contradict each other and you have to find where the curves intersect in order to produce the best of the best.

and the tt in audi tt stands for the toursman/tourist trophy... not twin turbo.

 

No and yes. In a turbo car such as the EVO with a pulse tuned exhaust manifold, a short runner is desired. The longer the runner, the more exhaust pulse energy is lost en route to the turbo.

 

Not to sound like a *****, but what is your car running in the 1/4 mile. You come in here with 3 posts and downtalk the god of DSM. So please show us your time slips. BTW Dave's car is in the 8's .

 

7s

 

Here is a manifold I built yesterday, took me about 4 hours to finish. Short runner the way I like a header. This is for Dan's car, our red 2003 EVO. Mounts our GT35R turbo or any of the BR line of turbos for the EVO, in the same spot as our cast manifold with our adapter.

The external wastegate for this set up mounts off the side of the turbine housing.

Point of this picture is to show the comparison of two similar turbos, this one being raw and uncoated and the next one is Jet Hot coated as some other comanies headers are.



This is a picture of a header I built for an EVO a few weeks ago. This one took about 6 hours to do. Did not come out as nice as the one above. The coating is what I am trying to show here. Also mounts the GT35R to the EVO.

As a side note these are made of .115 thick 304 SS, very thick just like some of the others out there. The top picture came our so good we are actually thinking about offering these headers to some of the more hardcore racers we are supporting.

Thanks for looking,

David Buschur
www.buschurracing.com

 

I like the "naked" look better

 

The master has spoken!

I think I will try and convince Dave to make me one of those!

 

David you wernt liying at all about these being beautiful....!! I cant wait to strap one of these with your 20g.......10's here I come.

 

The 20g can really get you in to 10's ?

 

He did..and with the right set up anything today is poss. Just look at curt brown ran a 11.2 on the stock turbo.....so ask your self how would you like to run in the 10's with a 20g and have close to stock spool up unlike the 35r..........just an exampel I ran one of my friends that pretty much has everything as myself except the ported head and stand alone and 264i/272e I also have alcohol 23psi pump 93oct, his is stock block and head tunning using the afc-2 and 272i/272e running a gt35r RNR's kit (we both have buschur stages 1-4)........it took him until 110 to pass myself on pump gas and I my car weighs about 450lbs more. So its not about the turbo its all about tunning and the proper mods to work with your set up. So if you do like myself did 10's are very do-able. Good luck

 

Hey dave how would the Mny flow Vs. you caste one? I want your 20G but I want a Manifold to flow it properly, you know?

 

exhaust pulse energy is also the same type of thing that can cause back pressure when it hits the turbine, the resistance entering the turbine will just cause the gases that are already trying to expand to expand backwards reverting back towards the engine. that's why i say the short runner increase boost header would come at the cost of maximizing torque which is why you need a perfect balance of both. equal length is just an optimization in general for scavenging, wahtever works on na will work on turbo too, effects less yada yada but we're talkin' on paper here, which means to attain full optimization it'd be beneficial to have equal length.

 

No, once the pulse expands inside the turbine housing, it does not crawl back into the small primary tube. The shorter the runner, the higher the pulse energy, the faster the wheel spins, the quicker the spool, the earlier the torque hits.