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View Full Version : New setup now check my log diff. with boost



exploder
June 23rd, 2009, 01:03 AM
Ok I changed cams from

232/238 595 lift and 115lsa to my new cam 239/255 623 lift 114lsa
I also changed to an edelbrock carb style intake with elbow from the L76
I also changed to 2" primary headers with 3" out the back from 1 3/4 2.5" out

I am enclosing 2 different logs files. The first will be with my old setup and the second with the new. In the logs if you look at map psi you can see that on the old log it looks like boost is not increasing linearly with rpm and seems to hold around 10-11 psi throughout the pull, but my gauge use to show 15. On my new setup and log it seems to show boost increasing slowly and peaking at peak rpm, but my gauge now only reads 11 and map pressure shows only around 11.

My old setup made 15psi and the new setup now only makes 11psi. I lost around 60whp and 50-60lbft. with all of the new stuff. I am trying to figure out if it is the cam that is bleeding the boost off or is it just not making as much do to the more efficent setup. I did however pick up a little over 30whp everywhere over 6000rpm, but I think that is partly a function of the intake.

I really just need some advice on what is going on and what needs to either be changed or checked to get my lost power back. I guess it also may be worth mentioning that the previous old log runs the dyno temp gauge showed 56 degrees and the latest logs the gauge showed 104 degrees. Thanks in advance.

exploder
June 23rd, 2009, 01:06 AM
http://i124.photobucket.com/albums/p14/qualitytireandperformance/DSC02422.jpg

We then painted the whole thing flat black including the valley cover...I then drilled and installed an extra -10 breather from the valley cover down to a JAZ breather can that we are mounting behind the front bumper.

http://i124.photobucket.com/albums/p14/qualitytireandperformance/DSC02429.jpg
http://i124.photobucket.com/albums/p14/qualitytireandperformance/DSC02433.jpg
http://i124.photobucket.com/albums/p14/qualitytireandperformance/DSC02430.jpg
http://i124.photobucket.com/albums/p14/qualitytireandperformance/DSC02435.jpg
http://i124.photobucket.com/albums/p14/qualitytireandperformance/DSC02436.jpg

exploder
June 23rd, 2009, 01:07 AM
http://i124.photobucket.com/albums/p14/qualitytireandperformance/DSC02399.jpg
http://i124.photobucket.com/albums/p14/qualitytireandperformance/DSC02397.jpg
http://i124.photobucket.com/albums/p14/qualitytireandperformance/DSC02396.jpg
http://i124.photobucket.com/albums/p14/qualitytireandperformance/DSC02395.jpg
http://i124.photobucket.com/albums/p14/qualitytireandperformance/DSC02394.jpg
http://i124.photobucket.com/albums/p14/qualitytireandperformance/DSC02390.jpg

joecar
June 23rd, 2009, 02:42 AM
Thanks for the pics...:cheers:

exploder
June 23rd, 2009, 02:55 AM
Thanks for the pics...:cheers:

So does that mean you didn't look at the logs???:help2:

joecar
June 23rd, 2009, 03:17 AM
I did look at the logs (I saved them to my desktop)... I want to look at them in more detail, but I have to trek off to work.

Cheers
Joe
:cheers:

joecar
June 24th, 2009, 02:14 AM
In Log_0069 I see that BEN is within 2% even if DYNCYLAIR wobbles;
I see boost stays at 9-11 psi thru-out the RPM range;
timing is 17°.

In Log_0177 I see that BEN deviates right where DYNCYLAIR wobbles... this may mean your VE table needs work in those cells;
I see boost ramps with RPM (goes from 2 psi to 11 psi), that doesn't seem right;
timing is 24°.

I like the old log better...

I'm no expert, my understanding is that too much overlap (wider duration and closer LSA) bleeds boost off (like you said)... the fact that boost ramps up with RPM supports this theory (since as RPM increases, the overlap time period becomes shorter reducing the amount of push thru ("over scavenge"...?)).

Doing "rough" calculations to compare overlap (are your cam spec's at 0.006"...?):
(232/2)-115+(238/2)-115 = 5°
(239/2)-114+(255/2)-114 = 19°
(did I do those right...?)
so your overlap has significantly increased.

My $0.02.

exploder
June 24th, 2009, 05:06 AM
specs are at .006 and this is the stupid cam that the comp cams tech guys speced for my setup. I have been in touch with a few shops and they seem to think the cam is hurting the power alot.