well I finally got my gm 3 bar map sensor installed and I decided to tune for the race this weekend and for daly driver at the same time.

15psi = 395.7 whp and 278.6 wtq
10psi = 344.2 whp and 218.1 wtq

 

is your B18c1 built? whats your setup?

 

cant really tell, but it looks lean to me.

 

gsr engine, t3/t4 turbo, front mount ic, mprd manifold, eagle rods, skunk2 im, itr valve springs, blitz blow off valve, tial 38mm wastegate. 98ctr

Its not lean. The O2 sensor on the dyno was reading leaner then what the car was acctually running. Im running in the low 12:1 air/fuel ratio.

 

t3/t4 turbo? yeah that narrows it down
specs?

 

wow. damn those are some high numbers.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mase &raquo;</TD></TR><TR><TD CLASS="quote">cant really tell, but it looks lean to me. </TD></TR></TABLE>

Looks to be upper 13's. Eh, could be safer though.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98ctr &raquo;</TD></TR><TR><TD CLASS="quote">gsr engine, t3/t4 turbo, front mount ic, mprd manifold, eagle rods, skunk2 im, itr valve springs, blitz blow off valve, tial 38mm wastegate. 98ctr

Its not lean. The O2 sensor on the dyno was reading leaner then what the car was acctually running. Im running in the low 12:1 air/fuel ratio.</TD></TR></TABLE>


what was that compared to?another wideband?

 

Nice numbers. Is that on pump gas?

 

so your only internal engine mod is the rods?

 

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

Looks to be upper 13's. Eh, could be safer though. </TD></TR></TABLE>

are you reading the same dyno? sheet shows 12.8 ish....but i believe he already answered teh question

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mpir3 &raquo;</TD></TR><TR><TD CLASS="quote">

are you reading the same dyno? sheet shows 12.8 ish....but i believe he already answered teh question </TD></TR></TABLE>

LOL! Damn lines are so close! I need to zoom!

 

Damn those are some sick numbers

 

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

LOL! Damn lines are so close! I need to zoom! </TD></TR></TABLE>

its ok i have eyes like a hawk

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Mpir3 &raquo;</TD></TR><TR><TD CLASS="quote">

its ok i have eyes like a hawk </TD></TR></TABLE>

...while I have to update my glasses about every year.

 

The only internal mods you have are the rods? What are the specs on the turbo? Can anyone explain to me what we want the a/f to be? I am still unsure about it.

 

Air fuel should be in the 12:1 to 12.5:1 air/fuel ratio. Im also using an AEM UEGO wideband in the downpipe so thats what I was comparing the dyno to. The only internals I have upgraded is rods and pistons. 98ctr

Pump gas all the way.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Makdaddynuge &raquo;</TD></TR><TR><TD CLASS="quote">Can anyone explain to me what we want the a/f to be? I am still unsure about it.</TD></TR></TABLE>

12:1-12.5 is a safe A/F ratio. The higher the number, the leaner it is. The lower the number, the richer it is. Stoich is about 14.5:1 (if I remember correctly? ) But we want to keep it safe, so mid 12's is a good range to shoot for if you're boosted. N/A motors would probably like it a little leaner, mid to upper 13's.

 

A/F numbers will vary depending on where in the exhaust stream they are measured. Leaner near the end and richer the closer you are to the head. Hence why his wideband read 12.0 at the DP and the measurement at the exhaust exit(where the sniffer is located) was reading 12.8.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98ctr &raquo;</TD></TR><TR><TD CLASS="quote">Air fuel should be in the 12:1 to 12.5:1 air/fuel ratio. Im also using an AEM UEGO wideband in the downpipe so thats what I was comparing the dyno to. The only internals I have upgraded is rods and pistons. 98ctr

Pump gas all the way. </TD></TR></TABLE>


are you sure the uego wideband is calibrated correctly? the way the dyno wideband reacted, it looks like its reading normal, Id richen it up a bit if i were u....at that power level, i wouldnt go over 12:1. anything over that, the risks far exceed the benefits.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by 98ctr &raquo;</TD></TR><TR><TD CLASS="quote">well I finally got my gm 3 bar map sensor installed and I decided to tune for the race this weekend and for daly driver at the same time.

15psi = 395.7 whp and 278.6 wtq
10psi = 344.2 whp and 218.1 wtq


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

Its kinda odd that you'd gain 60ft/lbs of torque w/ 5psi but only 51hp.. And your torque peaks/rolls 1k rpm's later w/ just 5 more psi. Usually you would build 5psi in just a few hundred rpm's. Just kinda odd. Not saying it can't happen, but its not typical. might be hinting at something in the tune.

Id trust the dyno wideband personally.




Modified by DIRep972 at 1:46 PM 9/29/2004

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Muckman &raquo;</TD></TR><TR><TD CLASS="quote">t3/t4 turbo? yeah that narrows it down
specs?</TD></TR></TABLE>

That's what I'm screamin.

Were either of these runs on pump gas?

 

BUMP

 

nice numbers

 

nice #'s!