Went to the dyno, comments or suggestions

[Kouki]

Well after numerous little problems I had to chase down, I finally got my setup ready enough to make a trip to the dyno for some tuning. My setup is as follows:
S13 Redtop SR
Completely stock bottom end including stock headgasket.
Brian Crower 264s, springs and retainers.
50trim T3/T4, .48a/r exhaust
38mm Tial waste gate(13psi spring)
Treadstone top mount mani
Stock intake manifold
Z32 MAF
740cc DW injectors
Hardwired Walbro 255/nismo fpr
Basic 3"exh, front mount, Apex'i filter
Power FC with FC-Datalogit
Innovate LC-1

Took a little while to get it tuned right, was having problems getting enough fuel to it. For some reason, I set the injector correction at 50 for the 740s, but in the injector map you can't go over 1.5 correction, well I needed more fuel than that just to get it to run smoothly. So what I had to do was set the injector correction at 72, which got it running pretty smoothly. I don't know why it was like that, but took forever to get that figured out. Maybe I should have got nismo injectors instead of the DWs? So if anyone has had that problem let me know that I'm not the only one, it fuckin stumped me and the tuner at the dyno shop.

Anyways, once I got that sorted out, we did a couple of pulls just running off the wastegate at 12-13psi, up to about 6000rpm, just to start getting afrs right. Got them pretty close, then did a redline pull and finished off the afrs. After that it was time to start adding timing. We added timing about 1-2degrees at a time, logged knock, but that wasn't as important as watching the graph change. Basically with solid mounts the stock knock sensor picks up too many frequencies that aren't actually knock, but other vibrations. The only time that we had any audible pinging, the knock sensor value was actually pretty low, so basically knock means nothing, tune on the dyno and change timing until the curve doesn't like it, even if it shows knock, it doesn't necessairly mean it's detonation. But anyway, Got timing pretty good with low boost.

Time to turn up the boost, did a couple lower pulls up to about 6000 so I could dial in my boost controller, and got to a comfortable 18psi for our 92 pump gas. Did a full pull, suprisingly the afrs were pretty good, average of about 10.5, could have leaned it out a little more, but I wanted to stay halfway conservative. Timing was pretty good up to about 6000rpm, had to do a little playing up higher than that, but got it pretty good too. All in all it was definitely a learning experience, most in-depth tuning I've ever done. I did most of the tuning myself, the shop owner was a great guy, and had me do all the work, but was there right behind me to give me any input he had, very helpful.

Now I'm having a little idle problem. it hunts around for a while after I let off and sometimes it dies. It doesn't matter if I'm in boost or not, only way I can help it is by holding the throttle just a hair as it drops to idle and holding it there for a sec to keep it from dying. I think I'm going to recirc the bov and see if that helps with that, also maybe lean the idle out a little bit as when it's hunting around, it puffs out a lil black smoke until it settles down. Any insight on this would be appreciated too.

All of the tuning was done on a Mustang dyno, remember that dynojets usually read about 15% higher than mustangs do.

And here are my dyno graphs, first one is once we got afr and timing close on low boost of 12 psi on 92 pump gas. Made 229hp and 195tq on this run.

http://i4.photobucket.com/albums/y135/super_rad_1000/Dyno3-25-08001.jpg

And this is my last run, 18psi on 92 pump gas. Made 310hp and 238tq.

http://i4.photobucket.com/albums/y135/super_rad_1000/Dyno3-25-08.jpg

Let me know what you guys think, do these numbers sound good, bad, etc? The car feels pretty good, and pulls rock hard to redline. I'm pretty happy with it. I could probably squeeze out a little more hp with a less conservative tune too, but being the first time I did any tuning this indepth, I'd rather be a little conservative for now.

[johngriff]

10.5 is rich enough you are losing power. Good to see you tuned off of tractive effort.

As for your idle problems, I found this pretty common with the DW 740's, seemed to never get a good consistent lean idle with them. Did you try advancing the timing up to about 20 in the idle ranges? Did you get a chance to check for boost leaks using a smoke machine on the dyno?

Other wise your numbers look pretty good.

[Kouki]

Yeah, checked for boost leaks, and vac leaks, none were found.

What do you think about me having to set the injector correction at 72 instead of 50 to have enough fuel adjustment?

Also what do you think about the little dip in power and torque right around 6600rpm? I played with timing a little there but couldn't get it to flatten out, just dip further. Didn't want to play with fuel there because the afrs were pretty even all the way across. How much difference do you think it will make if I were to lean it out to about 11.0-11.5 in that run? But if I did that I'd have to pull some timing out too wouldn't I? And wouldn't that compromise the difference?

[McRussellPants]

ill seismograph dawg.

[SoguRacing]

310 hp and only 238 torque? shouldn't you have more torque? i took mine to the dyno, had 232hp and 228 torque. you should have better torque numbers. i'm pretty much stock. lmk just looking for a reply

[Kouki]

ill seismograph dawg.

Yeah, I asked him about that, but he said that he likes to use the raw data, instead of smoothing because it averages it out, and during the tuning makes some parts hard to read to fine tune them. I dunno, thats what he said when I asked about smoothing. I guess it's a personal preference thing.

[Kouki]

ill seismograph dawg.

Nice ninja edit skills lol :naughty:

[blu808]

lol on the seismograph.

Anyways. On some of the engines we build with huge ported heads, huge cams, ect we will drill a 1/8" hole in the throttle butterfly. We do this because the iacv cant flow enough air to keep a steady idle.

Could indeed be just the injectors, or tuning as John said.

It is admirable to tune for reliability but your afr, and tq is telling me that you are throwing away some power.

[Kouki]

lol on the seismograph.

Anyways. On some of the engines we build with huge ported heads, huge cams, ect we will drill a 1/8" hole in the throttle butterfly. We do this because the iacv cant flow enough air to keep a steady idle.

Could indeed be just the injectors, or tuning as John said.

It is admirable to tune for reliability but your afr, and tq is telling me that you are throwing away some power.

Well I wouldn't think I'd need to drill the butterfly, head is stock, cams aren't that big, just 264s, I'm going to see if I can lean out the idle to help this problem.

And I'll probably go back in a month or so and do a little more fine tuning, with leaning it out on top just to see how much more I can squeeze out of her. Today I was mostly focused on getting everything close, which I think I accomplished. How much more do you think I can get out of it? Probably more torque, but not alot more hp?

[blu808]

sounds good.

[aNskY]

hey man good to see you got your setup together.... since i sold you all of that stuff i decided to rebuild so now i gotta have it made all over again :duh: