Thread: Tuned my car.

Nice numbers, but 3" is overkill for this setup. You did lost midrange. Its interesting how peak power is very soon and power didnt hold well and falling. I had on mine 10:1 DE just S4, HS CAI and Calum and it was peaking at 7200rpm and hold very nice.

I would have expected bigger number for these mods!

He didn't loose mid-range from the 3" exhaust, it was lost in the ASP header. But it doesn't really matter, you spend most of the time in motor sport in the high RPM band.

I don't know what kind of engine management the OP was using, but he could hold more top end power if he had more timing up top.



I agree. This set-up should be capable for HP in the 180's.

I was thinking 175-180 as well. Thanks for sharing your before and after results.

those are really nice numbers for being on a dyno dynamics dyno, normally they read lower than a mustang or dyno jet, so to pull those numbers thats pretty good

Why do you think its because of header? I would be much nicer to gain everywhere than only top end. 3" is still overkill for this engine and cams. In motorsport, in some corners you going from 4000rpm sometimes, so its matter. For drag, yeah you are all the time in hi rpm..



This is mine. Calum, S4, HS CAI. Its crank numbers.

Could you translate those numbers for us.

Yeah it would be nice to gain power everywhere! But good luck trying to get that on an N/A car. I say the header alters the powerband, because it does. When designing headers, its always a balance of power delivery. Charles's header does a really good job of increasing the amount of usable power. You may come out of a corner at 4000RPM, but if you look at the dyno, there is still more area under the curve with the new headers. So its a win, for any thing.

The exhaust doesn't play as a large of a role on an N/A car. But 3" isn't overkill. No such thing. Bigger is better.

I am using a Calum RT ecu. I just forgot to add it in(just edited first post). I dont know how you guys can remember everything on your car. But yeah with the headers the 3in exhaust helped the low end alot. It felt way better then a 2.5 exhaust. Next would probably be some c2 cams but I'll have to check out if im off a tooth down on the crank. Car did shut off after the break in reving at first, so idk.

c'mon guys. these are only S4's, not 5's, c's or m's. i'd like a link to some mid 170's or more with what this guy has. i think you've done very good to get as far as you have. though, as stated earlier, it DOES seem to be peaking rather early. investigate!
have you tried the cai extension for your intake? you should gain "area under the curve" with it on thanks to the famous "cai hump" from~4200-4800 rpm