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07-18-2009, 04:37 PM | #1 | |
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This is a little comparison between my previous setup and my new setup.
OLD setup yield a best of [email protected] with a 1.75 60' Quote:
Max boost 22.7 psi NEW setup yield a 60' 1.842 1/8 7.845 MPH 91.15 1/4 12.142 MPH 115.47 The same mods as before but: JE forged pistons, compression went from 8:5 to 9:1 BC 272 CAMs Ported and polish heads 3-angle port job on the valves Rel. Humidity 81 Air Temp 76 @ 6098 RPM boost:14.32 Timing: 25 Max boost 22.7 psi The two road dynos overlaid: I used the same smoothing and same number of datapoints in both road dynos. Juan Medina
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Last edited by juanmedina; 07-18-2009 at 04:48 PM. |
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07-18-2009, 05:45 PM | #2 |
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great comparison. bookmarked for furthur information. seems like cams added about 10 whp and shifted the curve to the right?
i guess this is just a result of the vf39 already operating outside of its efficiency due to its small size. please give us your opinion on how cams have changed this set up. from the looks of it, our cars dont seem to respond as well to cams as the 4g63 has. |
07-19-2009, 10:14 AM | #3 | |
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07-19-2009, 11:48 AM | #4 |
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Wondering if part of that was from the porting as well...looks like you lost some area under the curve from about 4600 rpms on.
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07-20-2009, 09:55 AM | #5 |
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first thoughts are porting and who did them.
seconds thought is towards the dyno numbers...they are just come from data logging a single gear pull, correct? third is that you have the exact same peak boost. Aren't you in fact off the scale of the factory sensor? if so, we have no idea what you actually were running for peak on either setup. I can go on but with the given data and the large ballpark of speculation and loose variables; I'll stop there. |
07-20-2009, 10:17 AM | #6 | |
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Yes the data comes from a single 3rd gear pull, but I have tons of logs and they all look very similar. I don't know what is max boost reading of the factory sensor, but I know I have hit 23psi before. |
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07-20-2009, 10:19 AM | #7 |
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You can only tell but so much of a port by looking at it in a picture...seeing it in person/3-D gives a lot more detail. Even more important is using your finger or a flowbench/pitot tube.
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07-20-2009, 10:31 AM | #8 | |
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I remember someone that said, that is really hard to hurt anything even with a bad port job. Where are my gains at least from the cams? And pics of the heads for reference. |
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07-20-2009, 10:41 AM | #9 |
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Damn those are awesome numbers on a 39!! I'd be interested in seeing dynos on the parts separately.... You know, vf39 pump gas; vf39 pump gas + cams, and VF39 + cams + pump gas.
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07-20-2009, 01:08 PM | #10 |
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Stock MAP sensor will max right around there depending on your atmospheric pressure. IMO, you REALLY should have either a 3 bar sensor or MBC+gauge running above 20-22psi range.
Suppose some compensations kick in and your target boost is higher than the sensor limit. The BCS will just keep adding more and more WGDC and you end up overboosting. |
07-20-2009, 01:23 PM | #11 | ||
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07-20-2009, 02:04 PM | #12 | |
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Quote:
Also, I don't know who made that horribly incorrect quote! A port job can change a lot of things and make things worse. So with that being said and we know the cams make gains...where did all those gains go?...hence my question about the port job |
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07-20-2009, 02:17 PM | #13 | |
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07-20-2009, 02:45 PM | #14 | ||
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The problem is that there is not other car that I know of running a build head and a VF39 other than mine and Rene's. So there is no data, experience and knowledge of how a setup like mine will respond. Also, My car is E-tune so that may have something to do with my car not performing as it should! Or may be the turbo is just max out. Will 60 degree weather vs 80-90 degree weather have as much difference as my road dyno numbers show? |
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07-20-2009, 02:51 PM | #15 | |
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For reference, my 68 airboy was done in 78 degree, low humidity weather and holds 336 whp at redline. The other day in 90 degree weather with high humidity I only made 328 tapering to 305 |
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07-20-2009, 08:10 PM | #16 | |
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07-20-2009, 09:18 PM | #17 |
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Yes, the other day in horrible weather it was not quick at all. The drive to work, the car is a little beast. At lunch, the car is slow. I just got home and its 68 degrees right now, car feels stout as ever. It seems this turbo is very finiky with temperature and boost
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07-20-2009, 10:18 PM | #18 |
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Juan you NEED TO STOP logging Manifold Relative Pressure (corrected) IT MAXES at 22.7 at around 14.5psi atmopsheric presure.
Noticed how it is strange that 22.7 is the max you see? I have about 20 logs that show the same thing and a thread on romraider that says the same thing. you either need to log manifold relative pressure (direct) or log both atmospheric pressure and manifold absolute pressure (direct) Logging Manifold Relative pressure (CORRECTED) will clip at 22.7ish psi at 14.51psi atmospheric pressure. Therefore you might HAVE been running more boost and less now. Don't tell me you can't log it - you can - if you can't you need to update your romraider. -jerod |
07-20-2009, 10:34 PM | #19 |
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All this stuff can and will effect how the car runs. Jsarv is also correct. You could be running MUCH more than what your logs show. Just log manifold absolute pressure and subtract out whatever atmospheric is. That will tell you what you are running. Time to upgrade to a AEM or similar map sensor. There are 3.5 and 5 bar sensor out there. Your tuner will have to modify the tune for it though. Pretty simple stuff.
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07-20-2009, 11:02 PM | #20 | ||
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TY |
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07-20-2009, 11:02 PM | #21 |
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I have seen 20-30 whp swings in my airboy road dyno's, between 60 degree weather= when I make big power faster spool up, and 80-85 degree weather=less power almost even more turbo lag...
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07-20-2009, 11:18 PM | #22 | |
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He doesn't need to - he just needs to log the correct parameter. I can log up to 24.65psi @ 14.2psi atmospheric pressure... After that I just watch my boost gauge as a reference.. I haven't hit my 5v MAP CEL so the ECU and MAP sensor are still OK - Everyone will disagree but the stock map sensor IS a 5v sensor... |
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07-20-2009, 11:20 PM | #23 |
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Are you running the same tune as before the new pistons, headwork and cams?
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07-20-2009, 11:24 PM | #24 |
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07-20-2009, 11:32 PM | #25 |
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I would say judging by the graphs - minus temperature - you might have been running more boost...
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