thanks that helps alot

 

Does anyone else notice, that in the bottom graph at around 3k rpms there is an increase of 30 lb/ft of torque?!

Am I reading the bottom graph wrong or what. The top two graphs don't seem to show the same amount of torque gain at the same rpm range. It looks like the header gets 30lb/ft above stock at around 3k rpms (in the bottom graph). Stock then catches up at higher rpms. Thats pretty friggin good... If I'm reading this correctly. But Why do the top two seem to be alittle different? Smaller graph or something?

 

every dyno is different that's why it's important to do all your runs on the same dyno

 

the downpipe has the cat welded into it. it's all one single piece

 

the bottom graph was not setup to guage torque, it is only an accurate measurement of the hp

 

awww shucks

 

selfinfliction,

you mentioned how headers will so greatly help future mods. whats the consensus on this, will they really greatly increase the gains of other mods? Like that of a cold air intake? or stage upgrade? I'm still wrestling with the idea of buying this. I wish there were more concrete #'s on just how a header would increase the gains of future mods.

for instance if having a header would add an additional 10 hp to a future stage 2 upgrade, then I'd say that would be worth it, but if we are talking only 1 or 2hp then I'm not so sure. I do realize this is impossible to tell at this point though. What about everyones experience with other cars with headers, with other added mods?

 

i just got off the phone with jon and gave him a few ideas on some stuff. possibly getting a header to someone that has dyno'd with the psi-fi kit to show how much it will help out after some major mods have already been done. we'll see what can be arranged for that situation. but understand that is weeks away if it can happen

 

Maverick, think of it this way.

When you drop a pulley size, your adding more boost correct? Now, where is all that boost going to heading when it gets out of the engine? straight to the header. At first a stock exhaust manifold may be fine, but once you start dropping pulley sizes, more air has to flow in a tiny amount of space. As self infliction has pointed out, the collector is less than 2". almost the size of one of the primaries (the smaller tubes that the individual combustion chamber gases flow through). Now, without that exhaust restriction, air can move freely and not hinder performance.

Does that help or did I confuse you even more?

 

Oh I do understand that. But my question was by just how much it actually adds power to future mods. I know this is impossible to tell as of now, and if I buy, I want to do it in the group purchase because it will be cheapest. So I'm still unsure what to do.

If money was no option it would be a no brainer. But just wanna get the most possible return on the mods I do buy, thats all.

 

Exactly, so I don't think anyone's gonna be able to answer your question for certain.

That said, IMO, if you only have enough to buy one thing for your car, then I'd be hanging on for the GMPP stuff or even go buy the psi-fi kit. But I would buy this header way before I would even touch a K&N intake for $250. Also bear in mind that that the GMPP stuff is still probably 4-6 months before you can get it, so maybe you buy this in the mean time, and think about that one later....

 

You can get a cat here and build you own dp for alot less. Most are around $50.
http://www.performancepeddler.com/Ca...Name=Magnaflow

 

uhm... that makes no sense at all,

hp = (trq*rpm)/5225

if your not accuratly measuring torque your not accuratly measuring hp.

 

^ werd, dynos measure TORQUE, they CALCULATE HP. Oh, and i also think over 400 is alot for a single header...

 

He didn't say that the dyno did'nt MEASURE torque, but the fact is that the SCALE of torque was larger than the scake of HP.

 

Actually not all of them do. Only load type dynos (which are less common) actually measure torque. Most dynos (including Dynojets) are called inertia dynos ... they actually measure power, and calculate torque.

 

either way, if either one is off then they are both off

ok that makes sense, you were refering to the scale on the graph

 

and what is the difference between your 'power' and my 'torque'? its the same thing... Inertia dyno's measure how strong the car pulls the rollers, and thats torque...

 

No, that's what I'm saying. Inertia dynos measure power, not torque. They're not the same thing at all. They're RELATED, but not the same. The only thing an inertia measures is velocity & time (acceleration), it uses that & the known mass of the roller to determine power, and based on that CALCULATES torque. An inertia dyno makes no kind of torque measurement ... only load dynos do that.