Mods, please stop the fighting. I am really interested in what Shiv has to say.

nj1266, dude, I understand your point, but for the love of God, let him post his results in peace. If you have a tuning question with his setup thats cool.

I don't know Shiv, never meet him. I have heard his name all over the internet as a respected tuner. I tune my own cars and like to think I know what I'm talking about. So I really enjoy having tuning discussions with some of the well known tuners. I'm not discounting your comments, just asking nicely that you start a new thread on the pro's/cons of a piggy back system.


my .02,
James

 

Unless there's a way to log timing on the X, what is Shiv supposed to post? The values off the piggyback are somewhat arbitrary, since you'd have to know the load/timing tables to make an educated guess as to what the car's true timing is, given the hijacked input signals.

l8r)

 

I also agree with this. The ecu flashing will be the way to go with the Evo X and GT-R. Mines already has the GT-R ecu hacked, and hopefully the Ecutek team are working on the Evo X. Looking at the results on the E90 boards and it looks like limp modes, bad idle, boost issues, changing tune on the dyno and installation issues with the piggybacks on offer. The reflash would be a better solution down the road, but for now at least Shiv is showing the potential in this new Evo platform. Keep up the good work Shiv and keep us updated with your progress in extracting power out of this new Evo!

 

Why would that be the case unless the car is knocking? He's already running the car really really lean for 91 oct. He also mentioned that the car still makes power even in the presence of knock.

In any case, an exhaust system seems worthless at this point. It'll probably cost hundreds of dollars..and a 13whp gain isn't enough to justify the cost.

 

Even if the car is knock free, 93oct. will allow running more aggressive timing and slightly leaner AFRs, which will make a lil more powa

 

where is the video? I need to hear this thing...

 

That 13 whp gain, boostez, is with a cat back. Everyone knows that the majority of the power made in an exhaust system is in the downpipe. Period, end of story. I still can't figure out why every company is making cat backs and not turbo backs for the car. The stock down pipe is 2 1/4 inches for christ's sake. Having a 3 in catback will help, but it's like having a coffee stirrer leading into a mcdonalds straw. Having that small diameter piping in the downpipe is choking the turbo, expecially with the hotside of this turbo being bigger than the 9. The flow capacity should be incredible with a 3 in downpipe. Open it up at the source! That's where the power is. Shiv is right; 350 whp on a dyno dynamics/mustang (400 whp on a dynojet) is just around the corner with the downpipe installed and a bit of ecu tweaking. Matter of fact, I think that's why the boost tapers so much by redlne. It's not like the sti's turbo running out of breath, it's being choked by the stock downpipe, and of course is undertuned from the factory probably for emissions purposes. Don't forget people that the new evo manages a 3 star environmental rating, the highest possible in Japan. Shiv, what do you think? Am I on to something with this or what?

 

I guess that "everyone" excludes some of the shops and fabricators that have been working on making parts for the car. So far the consensus seems to be that the stock DP is already very good.

l8r)

 

Well shiv said that the car should see some huge gains in the downpipe. Everyone has said that the stock downpipe is pretty good, but the diameter is still too small. Oh and shiv, I had a thought. Your comment about the stock cat having smaller inlets and outlets but larger internal diameter, and thus possibly higher flow than the 3 in high flow cat that was tested on the car might be a little flawed. To prove my point, there was an article in turbo magazine a long while back about people gutting their cats and increasing the internal diameter to make more power. This actually has a reverse effect on power output as there are two very important parts to an exhaust system making maximum power. The first is flow, but the second is VELOCITY. Gutting the inside of the cat, or having a larger diameter with smaller entry and exit points reduces velocity and creates backpressure, thus increasing pumping losses. So, I can almost guarantee that the stock cat, big as it may be on the inside, is robbing power, not boosting. Not meaning to correct you, as you've donw an excellent job on the car so far, but that's one thing that I'm positive about.

 

Oh, and ludikraut, all of these company's are going to make downpipes for the X, they are just starting with the cat backs first. Maybe this is common in exhaust development, I don't know. But don't make some smart *** comment like "ooh, well I guess by "everyone" that excludes the tuners who are working on the car." They have all said that a downpipe is in the works, my question was more of the rhetorical type; more or less wondering why they're designing the cat backs first and not the whole system all at once.

 

I suppose that if you were to stop making all-inclusive statements like "everyone", then I'll stop correcting them ... say what you mean and mean what you say ... know what I mean?

l8r)

 

ugh, this is ridiculous. Are you serious? If you read my post, then you would have seen the part that all of the tuning shops are going to be releasing a downpipe soon. So the tuners are included in the "everyone," my question is why they aren't developing the entire exhaust at one time. Do I really have to hold your hand through the explanation of this very simple point? Now back on topic please. Sorry Noize.

 

The ease of install for just a cat back system makes it easy to create and sell. A downpipe requires that the installer has a little more tech savvy then your average bolt on cat back setup. Thus, they are all sold in pieces, with the cat back portion usually being the easiest to develop because it has fewer things to sneak past then the downpipe usually does.

 

True, but I think that they would sell more right off the bat if they did the whole system all at once, rather than coming out with the downpipe later. I wont buy a cat back for a car, I think that catbacks are a waste of time. It's just not a complete system without the downpipe. Turbo back or nothing at all. Most people with high end cars like these are the same way. I'm not saying that they shouldn't offer the cat back by itself, but I AM saying that the downpipe should be available the first day the system is released for sale.

 

Good info!