Stillen Headers + Berk HFCs self-install report

Josh@STILLEN · 04-10-2009, 06:31 PM

I posted this in the other forum, but I'll repeat here.. with hopes this helps others find the right adjustments.

Quote:

Hey guys.. the exhaust can take some adjustment, as we have discussed. The best method (not saying anyone hasn't done this.. but I conferred with my service manager) is to loosen everything, and jacking at the y-pipe (hard!) get the clearance necessary to clear the crossmember.

This will take loosening the bolts at the catalytic converter brace which hooks to the transmission. This is a slotted brace, and can give you the 1/4" needed to clear everything.

You should not have to heat anything up to make clearance..

I have a 350Z on the rack, I shot a quick picture to show the location of the brace and the bolts I speak of:

wstar · 04-11-2009, 02:59 PM

Well I think the raspiness I was worried about is mainly only audible from inside the car. I finally got to hear it from the outside when I got it Dyno'd today, and it sounds great from outside. The place I was planning to go (that had a Dyno Dynamics) had some scheduling issues, but I might go back there Monday. So for now, I went to Carboys here in Houston where they had a DynoJet available. They did 3 runs, they looked pretty consistent. Max HP was 305.3, Max Torque was 241.2. These numbers sound a little low to me for full intake/exhaust compared to what else we've been seeing (given that its a DynoJet), but on the other hand (a) This is a 7AT, the rest have all been 6MT so far, (b) It was extremely humid in Houston today, and (c) Every dyno and every car is different

Anyways, I realized after I got home that I've got no way to make the graphs. He gave me the raw DGP file for the runs that has all the data (including A:F ratio), and you're supposed to download some free software from DynoJet to view it and make your custom graphs. However, I'm all Mac here, and their software is Windows-only. Anyone else wanna take my file and make graphs for me?

Video is uploading to youtube now too, I'll make a separate thread for the vid and the graphs (if someone can make them).

They also gave me a printout of the best run, I guess I could find somewhere to scan that in. The printout has lots of "gaps" in it, I'm not sure if it's just this run or if they're all like that. The tech said it was his sensors or whatever that were at fault for the gaps in the lines. Anyways, for a text analysis of what I can see on that, the torque curve is pretty broad and flat from about 4.5k to 6.5k, the horsepower is basically on a 45 degree slope that hits peak a little under 7k and stays there to where he cut off at (7.5k). Crossover point is about 6.6k.

Edit: bleh that DGP file he gave is like 95 bytes long, clearly I don't have the data, gonna go back by there later and get the real thing.

ChrisSlicks · 04-11-2009, 09:16 PM

Quote:

Originally Posted by wstar

Crossover point is about 6.6k.

Crossover is always at 5252 rpm because HP is calculated from torque according to this formula:
HP = (Torque x RPM) / 5252

You might have different scales for torque and HP which would visually throw that off on the printout.

wstar · 04-12-2009, 12:21 AM

Quote:

Originally Posted by ChrisSlicks

Crossover is always at 5252 rpm because HP is calculated from torque according to this formula:
HP = (Torque x RPM) / 5252

You might have different scales for torque and HP which would visually throw that off on the printout.

Heh, good point. Why on earth they put two different scales down the sides of the paper for values that are so close to each other is beyond me

04-11-2009, 02:59 PM	#2 (permalink)
wstar A True Z Fanatic Join Date: Mar 2009 Location: Houston, TX Posts: 4,024 Drives: too slow Rep Power: 3596	Well I think the raspiness I was worried about is mainly only audible from inside the car. I finally got to hear it from the outside when I got it Dyno'd today, and it sounds great from outside. The place I was planning to go (that had a Dyno Dynamics) had some scheduling issues, but I might go back there Monday. So for now, I went to Carboys here in Houston where they had a DynoJet available. They did 3 runs, they looked pretty consistent. Max HP was 305.3, Max Torque was 241.2. These numbers sound a little low to me for full intake/exhaust compared to what else we've been seeing (given that its a DynoJet), but on the other hand (a) This is a 7AT, the rest have all been 6MT so far, (b) It was extremely humid in Houston today, and (c) Every dyno and every car is different Anyways, I realized after I got home that I've got no way to make the graphs. He gave me the raw DGP file for the runs that has all the data (including A:F ratio), and you're supposed to download some free software from DynoJet to view it and make your custom graphs. However, I'm all Mac here, and their software is Windows-only. Anyone else wanna take my file and make graphs for me? Video is uploading to youtube now too, I'll make a separate thread for the vid and the graphs (if someone can make them). They also gave me a printout of the best run, I guess I could find somewhere to scan that in. The printout has lots of "gaps" in it, I'm not sure if it's just this run or if they're all like that. The tech said it was his sensors or whatever that were at fault for the gaps in the lines. Anyways, for a text analysis of what I can see on that, the torque curve is pretty broad and flat from about 4.5k to 6.5k, the horsepower is basically on a 45 degree slope that hits peak a little under 7k and stays there to where he cut off at (7.5k). Crossover point is about 6.6k. Edit: bleh that DGP file he gave is like 95 bytes long, clearly I don't have the data, gonna go back by there later and get the real thing. __________________ 7AT Track Car! Journal thread / Car setup details Last edited by wstar; 04-11-2009 at 03:09 PM.

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