layjzay

Does any one have dyno #'s with headers only. I have only seen a 3 hp gain after adding headers to a z, and retuning, that had a tune already. I know LG states that the are getting 40hp but after seeing the dyno results from this Z I have a hard time believing that other mods were not done also to achieve those numbers.

trapp

Don't believe them......I was considering getting headers and tuner told me off the record that he has tuned 20 Z06's in the passed year. 8 added headers...he was only able to get a few (2-3hp at the most). some showed no hp increases. He recommended not to get any type of headers due to no real increase in performance and that the stock header were very good. Brand type made no difference. This came from someone who could have easily sold me a pair. Honest tuner...

0Myhardtop

Oh snap...not again

layjzay

Ok, what about air intakes? Does K&N get what they claim? (27.2) I have tested Halltech. Got no gains with the street filter and got 11 more hp with no filter.

0Myhardtop

Oh snap...not again part II

UBNZO6D

Had 461HP & 428TQ baseline...See sig...

Greg

A427MAN

K&N Intake, LG Headers, and tune = ~500 rwhp!

355Spider

I only picked up 6 with headers and a tune but it felt like alot more. Revved freer. The Halltech filter did 14. By far the best investment.

Mako7

Headers add at least 20rwhp and rwtrq, and over a broad range. When you add the tune, you get even more. This is a silly thread.

Do race cars have headers just to "look cool" or for 5hp?

SharkbyteLT4

I think the gains are really over the broad spectrum.... you will surely see a big different in the midrange with the headers

layjzay

MId range (3000 rpm) 8 lbs of torque not noticeable when driving. Nothing like when you add headers to a regular C6. That was almost like adding NO

jbp8653

Very true. But I think the whole problem here is that on the LS7, the factory manifolds are just really good. Ever look at the manifolds on a LS2? It's almost comical but you will hear alot of people say they are "pretty good". I had longtubes on my 05 Z51 coupe and I thought they added quite a bit. On my Z however I witnessed 5 more horsepower over my car with the same mods, same tuner, same dyno, just other car had headers and Corsa Sports. Thats hardly a great deal.
But if you like them, it doesn't matter. I like them too, I just won't splurge the dough to get them for that kind of return.

layjzay

Very little return and alot of exhaust noise from header.

RoHo

So he still doesn't have a true answer.

There have been more than one posts showing a good CAI and a tune can produce 500 or near 500 HP, depending on who's doing the tuning and the dyno, now if this is your base numbers how much more will header improve over these base numbers is what I think he's looking for. I'm sure he's trying to evaluate his best bang for his buck, how many more HP can you expect from a set of $1,600 dollar headers.

I'm curious myself, still on the fence about headers.

kelp

I posted my 1 7/8" LG pro vs base dynos overlapped somewhere in one of the posts. Any way, here's the answer you're looking for:

You'll get a shift to the left in your powerband equating to about 10 maybe 15 HP. It tapers off to zero difference at peak, sometimes it's less at the peak, and less over the peak. Well, fact is you accelerate up the torque curve.

Are you disappointed? Don't want to get headers now?

I've done a bunch of mods, and numbers don't seem to indicate the guts, feeling, and even smoothness.

Lastly, every manufacturer always says they're the best. Since I have LG's I think they are the best.
But it doesn't matter. Just get them, or you're just talking. Don't split hairs. There's been way too much of that.

Mako7

All I can say is that you had some kind of weird problem. 5 hp gain for headers is crazy and no one would add that mod. There is a substantial difference between my car stock and now with headers, cats, tune and K & N. I will have a dyno soon (they are backed up 2 weeks and I am at the Long Beach GP this weekend).

trumper Z06

Jason from Katech could provide this info.

It seems that most tuners are saying you will get ~ 495 hp. give or take/on a dynojet with: headers, CAI, and a tune.

It's hard to get a breakdown on how much horsepower each component adds, as a stand alone.

I would like to see the individual numbers ... not the total cumative value.

Short-Throw

As Jason has said many times....

IT DEPENDS ON WHOSE DYNO !!!!

And no, I don't mean the fact that different brand dynos read out differently, I mean it's very easy to manipulate the input data.

I was talking causally with my shop about my project car's expected HP on their dyno asking them what they thought it would be.

They asked me, "What do you want it to be? We can make it read anything."

We all know there are many products out there that claim more HP and have actually decreased it.

DYNOs are tuning tools.

Sorry to say it, but the Marketing people use them as measuring sticks and we buy into it big time, yes, we are suckers...The true race shops don't care what the readout is because it's irrelevant and the peak rating doesn't tell the entire story anyway.

Okay, addressing the original post which often many times gets swept under the rug here.......


If you guys really want live proof, here's what we can set up.

As you all know, my engine is set to be dynoed at Katech very shortly.
I am putting on KOOKs headers.

We start a fund to cover shipping costs of the headers to Katech and the Katech dyno time. If enough people committed it would probably cost everybody under $5.

We can control the run and measure with and without the KOOKS keeping everything else constant.

If we can pull this off, any extra dollars over and above the costs goes to a charity of the Forum's choice.

Okay....time to put up or shut up!






Mike

Painrace

I'm in Mike. Just tell me where to send the $$. Even if the HP is very close it is throttle response and torque that matters in road racing.

Jim

Short-Throw

Jim,

Let's see if this spurs any interest. We have people willing to spend thousands on Mods based on what they hear. This could be the best few bucks anyone ever spent.

Jason,

Would this be an unfair test based on my engine build?

If so I would gladly pitch in my share for a controlled test on another engine even though it's meaningless to me, I'd love to hear all the wild banter stop.





Mike