Makenzie71

You were misinformed.

It's collected to merge pressures. No engine on earth fires multiple pistons at one time unless setup as a big-bang motor. You won't ever see equal pressures coming from the individual runners.

Can I have some of what you're smoking?

It doesn't matter what form of induction.

Pacesetters biggest bad rep is material deterioration, something often compounded by header wrap (which collects condensation). Constantly burning the exhaust will retard the deterioration, but he's not getting the kind of power he "could" be, and it simply wont last as long as a product made with better materials.

JIMMY54

iTrader: (2)

The shop designing my turbo manifold, told me that equal lenghts would reduce my spool time, the front rotor needs to be longer then the rear to create a sincronized blast of exhaust to have an effecient turbo.

That is why mazda doesn't have the turbo flange centered on the turbo manifold. Also the turbo is further evened out by having the different sized ports in the turbo as seen in this poor pic I found on the net.



further example of unequalness....


If equal lenth was indeed better then the manifolds would have the turbo centered.... it's not a space issue because you have lost of room to move that turbo back and forth.
The front rotor need to be longer than the rear rotor.

Here is an example of a high end Spoon header (piston motor, easier to see difference)

Unequal lenghts to correct the exhaust flow.....

I'm not saying racing beat is bad, I couldn't care less,

My pacesetter has no rust, it's been though 2 canadian winters, and it's 5 years old.

I remember the bad rep of pacesetter back in the day but when I bought mine it had a thicker flange than previous headers and better welds. Maybe you are thinking of back in the day....

Anyhow does anybody on here have a pic of a messed up pacesetter? Guys that own them post your negative points about the product.

I go back to my original advice, get whatever you can get a good deal on.

Exhaust wrap shortens the life of steel, but carl said his was holding up fine....

smnc

You guys forgot Mindtrain headers...

But I already had this discussion in the general support forum:
https://www.rx7club.com/general-rotary-tech-support-11/headers-466956/

smnc

Hey Jimmy,
I've never used a Pacesetter, so I'm not going to speak out against them.

I know they don't have the best rep, but I'm glad yours is working out for you.
But keep in mind, RacingBeat has been in business since the RX-7 was a NEW car. They have 20+ years of experience. I'm not saying thet makes automatically better, but it is somthing to consider.

I, myself, am planning on an SDJ headder for my custom exhaust.
Everything I've read and heard says they're the best. Best looking, most power, best durability.

Stevan

iTrader: (17)

ISC also has a stainless header, http://www.iscracing.net/exhaust.htm

I don't recall ever seeing a Mindtrain, you have to request info to see it at Kickyride.
Anyone have a pic of one?

smnc

There were Mindtrain pics posted here years ago, but the forum blows away old pics...



That ISC one doesn't look like anything too special, and it's expensive.

In fact it looks a lot like the RB Roadrace, but $144 more
http://www.racingbeat.com/resultset....rtNumber=16126



For that kinda $$$ I'd save up a bit more and buy the SDJ...

Stevan

iTrader: (17)

Yeah, it looks like a dual outlet header.

It is stainless steel like the $SDJ, RB is not.

It doesn't "appear" to angle sharply back on exit of the engine like the RB does,
thats something the ISC, and Pacesetter have incommon with the SDJ, though not as radical as the SDJ.

smnc

I missed that it's stainless (duh! I must be blind), which is a lot better than the mild steel of the RB.
And it does seem to have a better exit design. However the RB has equal length runners, while the ISC does not apear to do so.



I beg to differ that the SDJ exits too sharply tho...

Stevan

iTrader: (17)

I didn't say/mean the SDJ exits sharply, just the opposite.

It's kind of hard to tell if the ISC is equal length from the little pic, looks like you may be right. But the rear pipe crosses over the front one, giving it some length. Hard to tell without more info and better pictures.

Jimmy may have a point with the both pulses hitting the turbo at the same time, but I think N/A you would want the opposite.

JIMMY54

iTrader: (2)

Yeah that's what I am unclear about, is the effects on an N/A.

perfect_circle

because there is an empty space behind one pulse, it is filled by the other pulse, and they pull eachother put, making equal length better for N/A

smnc

Yeah, exhaust scavenging.
That's what I've always been told.

For a turbo, I can see unequal length kinda making sense, but not n/a...