Thread: SR20VE 4-2-1 "budget" header

I believe you have to give alittle and take a little.

So, if you picked up some nice mid range torque and HP then you should go the opposite way and maybe run them straight up or try to go for more over lap as it would extend out the power band more on the top.

I disagree (old news) with Andreas.

The header didn't go as expected.
The gains are from header + 3'' exhaust + tuning.
Also there are not such gains as 20lb and 16whp.
The best the diagram shows is 10whp and 11lb for limited range and not only from header.
It would be very informative if we had a comparison betwween old run and new without the tuning.

Everytime you change parts you have to retune. I am sure the header that was on there was tuned also. So when you put the new header on you have to retune.

So at 5750 the WHP says 140 and with new setup it says 156. So the diffrence is 16 WHP. So the 16 WHP is dead on.

Now as far as the torque goes I see that it is in actually 13 Lb Ft.

The conversion rate from Nw to Lb is ( Nm x 0.74 = lb ft )

At 5700 there is 190NM on new header and on old header 173.5 Nm.

I was looking at the chart as it was equal on both sides as it is very close.

Still a nice gain in the mid range,

I stand corrected about whp as I was looking wrong scale.

Sure still nice gain in the mid but for very limited range and also do not know how much is from the header alone.

@ Lonewolf,

The gain is not as bad as one may think. It's nice to have more top end power, but with the increased torque and hp in mid range you will sure have more fun with the car on the streets and on the track.

Sometimes we need to look at the 'area under the graph' rather than peak hp.

Peace

well said nizmo

Fixed that for yah.



As long as we're still using transmissions with static ratios. Peak HP is king with CVTs.

why without the tunning?, you are going to eventually tune the car with the header

there wasnt a huge amount of tuning required (more playing with the cam points).
How much of the gain in the midrange has come from the header, or the exhaust, or the cam change point, or the tune , who knows.

Like I said, I was expecting gains similar to what was seen vs the hotshot header, but I guess the Xforce header is a pretty good piece.

maybe the ASP header works a lot better at -5+5 cam gear settings than the current -2.5+2.5.

You can gain a lot from the correct cam change point. The window for switching the high cam on the N1 is between 5,300 to 6,000 rpm. Guess what, that is where you are seeing the most gain.

We have seen a 23 hp gain in the midrange just from changing the activation points on a car with N1 and ASP header. Original point was at 5,300 for the intake and exhaust, change it to 5,700 intake and 6,000 rpm exhaust. Just be aware the activation points is very important for mid range power. It doesn't do anything for the high end however.

I would say the ASP gave you a solid 7.4 ftlb/10 Nm gain below 5,000 rpm. There is no disputing this because the gain was made below the activation window. My guess is that the ASP gave you 8 hp in the midrange but not 15 hp like other have said.

If you are going to try +5-5, you will gain even more midrange but will lose out on the top end and the peak when come in sooner. It a compromise when playing with the cam gears.