I just went to get a simple baseline pull on the dyno today before I install all my turbo stuff. I ended up with 68whp @ 5400rpm and 68ft.lbs. torque.

It looks ok (for a d16) until ~5500rpm when the power just falls to the ground. I have the datalog of the pull and was trying to find out what is wrong if I could, just for the sake of learning.

The setup is, d16y8 block w/ z6 head, wiseco/eagle bottom end, around ~8.7:1 compression, y7 stock exhaust, otherwise stock engine. s300 with untouched stock p28 calibration other then revlimit/idle adjustments.

Here is the infos:
http://jackmoves.com/~justin/datalog-stock-7k.s3d



Any ideas? I can upload my calibration too if needed, but it is just the p28 one that comes with Hondata s300.

Justin

 

What map sensor are you using ?
Your log is showing 12 psi at 5200 rpms etc...

Are you using a wideband ?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mtber &raquo;</TD></TR><TR><TD CLASS="quote">What map sensor are you using ?
Your log is showing 12 psi at 5200 rpms etc...

Are you using a wideband ?</TD></TR></TABLE>

Stock map sensor, engine is still in stock n/a form. I have a hondata 4bar for boost (which I bought from you guys actually, along w/ my 1000cc RC's )

12psi where? I am at altitude too (5280ft) so 12.6psi or so is atmospheric.

I did not pay for wideband on this pull since there will be no tuning on this setup. It was just to get a before turbo baseline #. I knew the power would be weak, but I at least expected the car to pull through to 7200rpm redline as opposed to 5500rpm and pooper out.

Justin

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by justinCO &raquo;</TD></TR><TR><TD CLASS="quote">

Stock map sensor, engine is still in stock n/a form. I have a hondata 4bar for boost (which I bought from you guys actually, along w/ my 1000cc RC's )

12psi where? I am at altitude too (5280ft) so 12.6psi or so is atmospheric.

I did not pay for wideband on this pull since there will be no tuning on this setup. It was just to get a before turbo baseline #. But I at least expected the car to pull through to 7200rpm redline as opposed to 5500rpm and pooper out.

Justin</TD></TR></TABLE>

1. Calibrate the map sensor to your altitude.
2. Use a wideband to monitor your air fuel ratios.

 

High altitudes will not show false pressure readings. The higher the altitude the lower the barometric pressure. Your map sensor should be showing a little vacuum @ WOT because of the high altitude. Even though technically there is not any vacuum in the manifold because there barometric pressure is too low to get the 0"vacuum reading you would get @ sea level. If your datalog shows 12 PSI and you have a stock map sensor then you probably have the wrong sensor selected in you S300. Are you sure it is set for a stock map sensor and not a gm 3bar?

As for the power drop off... what is the AFR during the dyno pull? Are you sure it isn't going pig rich because the ecu thinks its @ 12 pounds of boost?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by mtber &raquo;</TD></TR><TR><TD CLASS="quote">

1. Calibrate the map sensor to your altitude.
2. Use a wideband to monitor your air fuel ratios.</TD></TR></TABLE>

Do you have to do something other then selecting the correct MAP sensor in Smanager? I'll take another look.

Yes, wideband will be used of course when it goes in for the "real" tuning once turbo stuff is all installed. I will not be tuning the car btw, my local tuner will be...even though I (street) tuned my old car on old hondata stage4 system.

Thx,
Justin

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Tomdata &raquo;</TD></TR><TR><TD CLASS="quote">High altitudes will not show false pressure readings. The higher the altitude the lower the barometric pressure. Your map sensor should be showing a little vacuum @ WOT because of the high altitude. Even though technically there is not any vacuum in the manifold because there barometric pressure is too low to get the 0"vacuum reading you would get @ sea level. If your datalog shows 12 PSI and you have a stock map sensor then you probably have the wrong sensor selected in you S300. Are you sure it is set for a stock map sensor and not a gm 3bar?

As for the power drop off... what is the AFR during the dyno pull? Are you sure it isn't going pig rich because the ecu thinks its @ 12 pounds of boost?</TD></TR></TABLE>

Yea, that's why I asked where the 12psi was. 'Cause I see a little vacuum at WOT myself. I don't see positive manifold pressure anywhere in my log?

Yes, I have the "Stock MAP Sensor" radio button selected in Smanager.

No AFR's for this one It very well might be going rich beyond 5500rpm, I had thought about that too.

Thanks for infos.

Justin

 

Post your calibration. Your datalogging is reading 12psi positive manifold pressure

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SOHC_MShue &raquo;</TD></TR><TR><TD CLASS="quote">Post your calibration. Your datalogging is reading 12psi positive manifold pressure </TD></TR></TABLE>

http://jackmoves.com/~justin/p28-breakin-map.skl

So, what am I reading wrong? I didn't see 12psi anywhere, so I must be reading something incorrectly or not have a value showing on my graph?

Thanks for looking.

Justin

 

ahh your settings must have been set for absolute pressure. I guess on hondata the graph seems to still read in whatever unit settings it was originally logged in. I figured if i changed it in the program it would reflect that in the units.

 

Yea, you'd see about 12psi absolute at this altitude WOT.

 

So I downloaded the datalog and was wondering why do I see a AF ratio that doesnt get above 12. If he didnt have a wideband should I be able to see any readings. I also noticed his iat stayed the exact same over a 30 second period.

 

Here is an interesting thing I found out yesterday. The bolt that seals the inspection hole in the head next to where vtec solenoid is, was found just sitting in the head when I took off the vc

Think this had anything to do with the problem? Maybe vtec was not working?



Justin