im looking at the dyno graph again and ummm it doesnt make much sense

it looks like stock hp is well over 250 (the blue line) and the run with the exhaust (the red line) is barely higher. i don't see a 21hp gain on there...

 

The top 2 lines that are mostly flat are the torque curves.

The bottom 2 lines that are gradually increasing is HP.

The higher of the 2 lines for each measure of power is the 2nd run (after the exhaust).

 

The bottom line for me is the result in track time. You can have 500whp with dyno to prove it but if it doesn't result in quicker 0-60, 1/4 mile, and or lap times, its all a waste.

With that said, the 2nd best is the dyno. I have to thank companies that provide some data to back up their products, including invidia.

I have the GHL exhaust on the way and i was comparing the dyno charts. Seems like GradZ pointed out what i realized as well.

Seems like most of the power kicks in above 5500 rpm. Where the ghl emphasizes the power increase really nice in the lower rpms and gives another pop above 5000 rpm.

Like i said, its all an excercise in speculation until its can translate to a faster car on the asphalt. I will get time slips with the GHL, NOS, and GHL+NOS.

Can't wait for owners to install more aftermarket exhausts.

Invidia


GHL

 

Duuuuude..... No offence. I am not against modding or Asians.
I like mods (my exhaust is on order, my stereo is upgraded, I am aching for Rims and would kill for a new front fascia and rear bumper) but there is no word in our vocabulary for a poorly modded car. The car showcased in this post is subtle but the exhaust is almost over the top (for me).

Get used to the term rice because I am not the only one who uses it. We need a term for this especially when one abuses such a nice car as the Z.

Such abuse includes but is not limited to

1. excessivley enlarged exhaust outlet.

2. Excessive application of rice, I mean race decals for cars not affiliated with racing in any way.

3. Application of company decals whose products the car is not equipped with.

4. Fart in a can sound silencer removal (unless you have a track car

5. Ostentatious shift **** which does not match interior.

6. Addition of any part or trim under $39.95 to make your car look more "sporty"

7. Overly bright paint jobs that would make the blind squint

8. Painting anything inside the cockpit

9. Adding an aftermarket RPM gauge to car that will never have a snails chance in the sahara of breaking a 15 sec 1/4 mile

10. Addition of "fighter jet rear wings" that have a better chance of ripping off the rear deck or trunk lid than helping aero dynamically

I know this is off topic but I just had to clarify. If someone has a term more appropriate than Rice to indicate these criteria, let me know!

 

Please don't derail this topic with something ("rice") that has more than likely been discussed in every car forum on the internet. If you like, start a new topic -- don't ruin this one.

I think I speak for many people when I say that I am very interested in any information regarding an exhaust sytem that turns 20-25 extra horsepower and costs $800.00!!!

 

im going to have to say....NICELY PUT syf0n!
importlife.com...another words is itd be better to have low end power for 1/4 and high end for top speed....another words GHL or Invidia.... The GHL looks nice ill give it that....i dotn exactly love the Invidia stylin but hey with +20 hp somewhere i can get used to it....btw...which system would be ideal for autocross?

another question for all....when invidia says catback....does that include the Y pipe?

 

Invidia

baseline HP 235
TQ 232

Exhaust HP 250
TQ 234

GHL

Baseline HP 223
TQ 211

Exhaust HP 231
TQ 220


Anyone else notice this by comparing the two charts, or am i reading something wrong. Opinions please


Later
Aceman

 

aceman, both cars were probably dyno with different machines and the conditions were probably different. That's why the difference in numbers.

also, I don't believe in the little spike in Invidia' dyno chart. WTF is with the spike at the end? based on just one dyno comparison, it's not accurate. So the peak gain is right at redline? sounds kind of bs to me..

anyway, I think we need to see another dyno on the Invidia before we jump to conclusion...

 

Where do you see the "rev limiter" kicking in the GHL exhaust dyno chart???

You can see that the top RPM band is a mess and that the power got killed at 6300rpm.

That pigtail at the top end of the Invidia system chart is enough info for me to not buy the system. Add to that, that I don't see the 20+ hp gains in the chart.

 

It appears that 256.2 HP number they claim is that red spike towards the very end. Kinda cheezy if you ask me...

 

I don't get it either Heat.

Although I do like the Injen exhaust, I can say the tips on this exhaust are better looking.

Here's a real example of rice, OK!

 

But thtat is a pretty big difference.....

 

Also, looks like the GHL dyno was run with an automatic- If so the auto would have naturally been a little less HP.

 

If the "measured gain" was measured at the red noise spike then the claim is worse than BS. That is obviously a noise spike of some sort and not "real" hp. Even if it was real (which it isn't) what good is a 21HP boost over a 10RPM range above 6 grand?

I agree with the other poster who said we need more data before we know anything.


Just my $.02

 

Where do you get 6300rpm from? Its 6600 look at the dyno again.

The 21hp gain is at the top end, you can clearly see it in red, versus the blue stock run. Its called peak hp. its not across the band.

The dyno does show the gain, its clear the red line is above the blue line. if you look at the hp and torque guage on the sides, you can make out the differences.

 

Why is there no crossing of the HP and the TQ around 5k to 5.5k on the Invidia exhaust? The GHL curve crosses. They just seem like two different charts. Opinions??


Later
Aceman

 

The crossing is irrelevant. Look at the HP values and TQ values. On the Invidia one is scaled to 250, the other 300. If they were scaled both to 300 they would cross. Pay attention to what values you are actually looking at.

 

Crossing IS relevant. On every dyno plot the hp and torque curves cross at 5252 rpm. What's the deal with that? Maybe they took the HP and torque curves from different dyno runs?

 

This is what they email me yesterday;

"We are working on getting more pictures of the
full system, the systems will not be here for about 4
more weeks. We are taking orders now on the first
shipment, as we only have 5 left on the first batch
coming over. The dyno shootout was done Turbo
magazine, and I was informed that the #s on the
notations represent: Stock Car,+ Temperature Normal
operating temp,+ the Exhaust system. Let me know if we
can be of any further help, I will get the pics up as
soon as I can."

Thanks,
Mark

Do your own judgment!

 

I just got my Turbo issue yesterday and the Invidia was tested, but for a Supra, not the 350Z.