This was my latest dyno...01/03/04

174.6whp - 189.2wtq - 1999 SE-L Manual

1999 SE-L Manual
PopCharger
Midpipe
Testpipe
Stock 16 SE-L rims

Dyno was on a 248c Dynojet...a/f ratio is at bottom of graph.

 

Wow. And you ran a 14.9x with that power? I dyno'd at 175.x hp and 185.x ftlb torque. Nice!

BTW. Your a/f ratio. You ran really rich from 4k on. How old is your 02 sensor? You could pick up 5-8 hp just from a new 02 if you old one is as bad as that chart indicates.

 

I'll have to look into the o2 sensors. I haven't changed them since I got the car...except for the rear sensor. What you say makes sense though.

What kind of times are you seeing with your hp/tq #s?

 

which of the two O2's are better to change? or are they both neccessary to make a difference? i've got 95k... and my numbers have been low the 2 times i've dynoed. 171hp and 167tq with ypipe, intake, catback... but my 1/4 mile #'s are close to normal. so confused.

 

Wow...are you auto?

There are 2 important o2 sensors...both connected to each outlet for the y-pipe. Both of these will affect performance, iirc.

But you may only have one out. Are you getting a cel or anything?

 

no CEL.... and i'm a 5spd. i'm almost thinking that the dyno numbers are wrong... the only dyno readings i have are from a dynopack... a mobile system. i just don't get how i can put that amount of power and still be running 14.7 @ 94.5mph with a ypipe, intake, and test pipe. not great times... but i've got a loaded SE and i weigh 230lbs.

 

Definitely should be the dyno...Try going to a different shop. I've only been on Dynojet dynos and the #s are pretty consistent. Your numbers are about -20hp/-20tq compared to other charts I've seen with the same mods and 5spd.

 

Shouldn't matter though at WOT right. ECU just uses maps at WOT IIRC.

 

Hmm you might be correct. But look at the a/f ratio. Something like 3-5:1? That's rich as hell.

 

I think it reads from 10-17 or something like that. Looks like it dips to around just above 11:1? Kinda hard to read... I really have no idea what the AFR should be, but that does seem a bit on the rich side. On the other hand those numbers seem pretty high for a 4th gen without a y-pipe.

 

^^ A lot of fellow DNE friends think I have a factory freak on my hands. My last dyno was 163whp and I only had a K&N drop-in at that time.

Oh well, I'm getting another dyno at the same place in February so I'll see if there is any variance. (I'm also adding some mods before then so we'll see)