what were the temps on your 2nd runs? It got cut off a bit.

I don't see how it couldn't make more power, pipes are pipes its not like a tune or something. MotoIQ even tested it and loved it:

http://www.motoiq.com/magazine_artic...s-exhaust.aspx

 

LOL! I did not dyno my car before and after. But I could for sure feel a difference after putting the Joe Z exhaust on.

 

Power gains or not so many people have Joe Z intake and exhaust and they all love it!

 

How glad I'm that I used to have Honda CTR with K20a engine, and modified it... After that, I understood, that those exhaust systems, air intake and so on (not mentioning turbos or chargers) are not giving you much or any real gains apart from "feeling in head" that it goes better..

Having IS-f, the only "mod" that I did, was changed rear turn signal bulbs to "silver" looking color, for not yellowing from inside...

I have friend, who keep modifying their E92 335 and M3, and when we try comparing, it is still the same thing about performance...

U can't beat any MB V12 in anyway, without having any turbo or charger installed...they are just too brutal.

Having exhaust system just to make sound different - that is correct reason!
Having suspension for different steering feel - that should be the reason!
Having air intake for different sound - that should be the reason!

These things don't do real change in real driving or drag racing, apart from nicer dyno numbers..

It is just IMO.

Don't take it personaly, but hoping something magical, with changing stuff that just really eliminates things that factory had to install for CO2, is just naive ..

 

^^^ The combo of intake, headers and exhaust on the IS-F does make a noticeable change on the street and the track. Your looking at a gain of at least 50 whp and members have hit high 11s at the track. It not all just for sound or a feeling in the head. Its a V8 not a little 4cyl engine. Just saying..

 

Im thinking that the problem is probably the JoeZ intake. Unless its properly wrapped, the JoeZ intake will heat up fairly rapidly and cause IAT to rise. Try using the stock intake during a rematch and see what happens. If that dosnt work, i would put the car back to stock and race him again. If the other isf pulls both times then modifications are not the problem.

 

I wouldnt worry about it, so many of us have seen 15-20 rwhp... i feel like something is not being done right. Was the same procedure done on the second dyno, did the car get heat soaked, how long was the driven before it got put on the dyno?

 

I have the injen intake and it gets so hot and i got all my gains.... are you doing the pedal dance on these dyno runs???

 

I have the injen intake and it gets so hot and i got all my gains.... are you doing the pedal dance on these dyno runs??? was your a/c on?... that would take 20 hp all day

 

vdc off > sport> M mode, dyno in 6th gear smoothing set to 5 that is how it should be done on both. There are just too many variables to tell from just glancing at dyno sheets.

 

You should cleanup your O2 sensors and MAF sensors with some Electrical Connectors Cleaner spray or a Intake Cleaner spray (both available at any auto store)

I had the exact same issue as you when I got my my JoeZ exhaust installed, it turn out to that my installer used WD40 to loose the O2 sensors, a little Electrical Cleaner and my power was back !

 

Dyno at 6th gear, vdc off, M... Car cooled down for more than 30 minutes prior to dyno... with fans infront of car during dyno. Lets wait for JoeZs input.

 

In for what Joe says

 

My comment was more about the race than the dyno run. I have had IAT problems due to the JoeZ intake in the past so i know what a difference the heat soak can make.

 

I don't think JoeZ owes any explanation to anybody. He did in the past out of his own good will.

There is overwhelming support for JoeZ products, especially the exhaust and the power gains associated with it (e.g., caymandive's very objective and detailed comparisons and dynos).

So let me get this straight, one person with no power gains that could be due to so many other possibilities than the JoeZ exhaust, and in a community with so many positive supporters of the JoeZ already, now make the JoeZ exhaust at fault?

One owner with baseless accusations now throws out years of positive JoeZ results? WT_?????? Are you kidding me? COM'ON MAN!!??

And whoever said that the JoeZ makes 50whps by itself is off the mark too. Please don’t add to all these KID’s, already unrealistic and premature hopes of beating Lambos, Ferraris, and GTRs with bolt-ons.

For the record, I do not own any JoeZ products. The only Mod that I have are Sikky headers. With my stock exhaust and these headers, I get right about the same power gains as veteran IS-F modders in here like Caymandive, Darbs, and others, minus the gains they got from there the JoeZ exhaust and intake.

So what does this tell me? It tells me that the OP needs to spend some more of his own $$$ and troubleshoot HIS OWN PROBLEM before blaming JoeZ in a public forum hoping JoeZ will troubleshoot HIS PROBLEM for him.