Thought I'd post this again as I've seen a lot of recent Evo 9 dyno charts and a lot of recent "whats the best downpipe" threads. I've had great success running my Blitz 2.75" and I LOVE the torque.


The car was tuned in February by Shiv and has been running flawless since. I've only added a test pipe since my tune and am looking for a re-tune whenever Shiv comes to the NW.


- 93/94 octane gas from Cenex
- 1.5bar boost tapering to 1.4bar at redline via EcuTek
- 2.75" Blitz downpipe, Helix 3" high flow cat, Skunk2 3" Catback
- everything else STOCK (yea, no friggin fuel pump)


Results are +69ft/lbs and +63whp!!! Car is friggin fast... feels a good deal faster than my old 2003 Evo that had cams and all supporting mods.

The lower pink line is the baseline with the exhaust already installed on the car. The second blue line is after the tune (duh).

 

OH NOES, ANYTHING SMALLER THAN 3 INCHES IN YOUR EXHAUST WILL CAUSE THE EARTH TO ROTATE IN THE OPPOSITE DIRECTION!!!!!!!!!

Sick results!!

Scorke

 

I don't understand. What do the results have to do with the exhaust you're using? This is all the result of tuning plus a significant raise in boost. To show power gains from the exhaust, you'd need to show your baseline before the exhaust and then after. You'd definitely make more power with a test pipe and possibly more with a 3" DP (not likely, though).

Again, I don't see any correlation between the downpipe and the torque gains. You can get those same gains with any downpipe.

 

He's not saying there exceptional, just good considering the choice/stigma.

Scorke

 

Are you guessing, or did he tell you that privately? He sure didn't make that point in his post anywhere. Maybe you're reading into it what you want to see?

The power gains are great, but there's no evidence it has anything to do with the exhaust. If he put on a different exhaust with test pipe and 3" DP, it may make more power. We don't know, because there's no comparison. Giving out right power numbers doesn't tell us anything other than the exhaust isn't keeping him from making power (no exhaust does).

 

How are you holding so much boost at redline? Did Shiv install a different pill or use a external bleeder? Great results.....

 

Nice gains!

 

He's just saying it holds that...he doesn't actually have a MAP sensor log showing only a 1psi drop at 7k. People make this claim all the time based off trying to read their boost gauge while going full speed on the street usually. The stock turbo simply can't hold boost like that unless forced, and using the stock boost control solenoid certainly doesn't do it. You also see the negative effect of messing with restrictor pills in the attempt to not use an MBC when the torque curve get choppy then spikes suddenly at 4500rpm or whatever. That is the boost being erratic and jumping up 1000rpm after the initial boost ramp-up. This doesn't happen with MBCs usually, but it happens all the time on Evos relying on the ECU to control boost with modified restrictor pills.

 

Warr is probably right about the boost, it's hard to look at it when your going that fast but it looks damn close to 1.5bar at redline. And I don't have a MAP log to show anyone. I did just buy EvoScan though, I should see if it logs mani pressure or anything.

And I didn't mean to make the post about which exhaust to choose, etc. I just wanted to show what gains I got with what parts, thats all *edit* - and how easy it is to make GOOD power on these cars with only exhaust and tune. And I don't know Skorke or talk to him privately so I don't really understand that. It does show decent power can be made on a 2.75" downpipe. You can see it getting a little flat up top though and the torque drops pretty fast, but since I've swapped my Helix out for a test pipe, I can tell the top end is better.

If you want to read anything into my post, I think the reason for my total power output was the tune(r).

 

Can't the 9's automajically lower their boost when they see excessive knock though? I wouldn't think you could still retain that feature with an aftermarket manual or electronic boost controller...?

 

You don't need to, because the ECU retards timing when it detects knock. It doesn't need to lower the boost.

 

nice numbers man