WEEE muchos gracias, i'll be buyin' those some day.

 

any results yet vtecwrecker?

 

So , waht is the deal, two month waiting. Have you dynoed yet or what?

 

If you check the OT area vtecwrecker has been having some issues at home, so give the guy some time.

 

From my experience, a tubular manifold will give you a better top end power and most likely no gain or even a little loss on the mid range. When purchase an after market manifold, you should look into the material that was used and the thickness of the tube. We have tested the Maxford manifold on and off track without any problem. The manifold held up great and the top end gain was about 10whp as I recall.

Thanks,
Tom

 

but someone dynoed... and it was zero hp gain... or like hardly any.

 

werd im waiting to hear about this

 

Thats because it was tested against Buschur's ported/coated manifold. Dave commented that he was impressed with the results.

 

https://www.evolutionm.net/forums/sh...3&page=2&pp=15

???

 

Thanks for reading.

https://www.evolutionm.net/forums/sh...1&postcount=14

https://www.evolutionm.net/forums/sh...&postcount=490

 

i dunno if that was suppose to be sarcastic but you should not be so surprised at the gtspec results... it's basically a stock manifold made outta tubes, that's not necessarily a tubular header in the sense that most people are asking about. the gt spec is even pulse timed just like the stocker...

other types of tubular, particularly the megan ssautochrome plus infinity other headers don't do anything based on the thread that i posted... thank YOU for reading ;].

 

lol...'made out of tubes, but not necessarily a tubular header.' You honestly have to be kidding. Being pulse timed only means that its a better engineered header than the ones you posted. Your excuses are weak at best, come again.

 

i don't see why i have to come again... most people ask about the poorly designed headers that you're referring to as poorly designed... the information is for them.

and it is a stock header made of tubes... it's not equal length it's pulse timed... that doesn't necessarily mean it's better or best designed.

 

Equal length manifolds CAN also help time the pulses more evenly than a non-equal length manifold, HOWEVER, a properly designed non-equal length manifold CAN offer evenly time exhaust gas pulses as well.

You don't necessarily need an equal length manifold to achieve this.

One disadvantage to an equal length design, however, is that, often times, they require lengthening the runner to the extent that they have so much internal volume that spool time can often increase. This is a result of lower TIP (turbine inlet presure) because there is more space in the manifold to fill up before the exhaust gas reaches the turbo.

One good thing about the GT-Spec unit is that it is correctly pulse timed without having to use equal length runners, but it's tubular design offers improved flow without too much of an increase in internal volume.

Does this make equal length manifolds "bad" in comparison to non-equal length one or vice-versa? No. Just different.

 

this is correct ^. my point originally is that no one should be surprised at the gtspec's performance especially compared to that of the stock ported manifold. why? because what are the real benefits to having a tube made header? it's already smooth inside... and you can more easily manipulate the shape. the second is made nul due to the fact that they're taking the design straight from the stock manifold. the first is made nul if it is compared to a stock manifold that is already smoothed on the inside and port matched.

there are other subtle differences however. one is that the stock manifold when port matched will reduce the id of runner from the port to the rest of the header. this creates more exhaust gas velocity. mitsubishi made the manifold to produce a fast spooling turbo, not a maximum power turbo. in comparison to a tube made header... there is no reduction in internal id because the thing wasn't made too small and then smoothed out where the ports are, it was made the "right size" which effectively makes the exhaust gas velocity a bit slower compared to a stock manifold.

is the stock manifold in ported and polished fashion a maximum flow limitation on the stock turbo? prolly not... does a tubed header show some loss in the mid range... according to buschur... yes. does the tube header weigh less... probably. are we talkin' about big turbo headers? no.

so with these things in mind a good decision can be made about a purchase.