I dyno'd my car on 3/28/02. I got 213.7hp and 254.3 tq.

I dyno'd again last night. I got 200.6hp and 225.5 tq.

Now here's the story. The only difference since 3/02 was the install of a warpspeed Y and Don's VB mod. Nothing else. Same plugs, same intake, same everything. I purposely didn't add anything else because I wanted to see the difference the Y alone made. Here's what I've done so far: I replaced the rear O2 sensor about a month or two ago; I replaced the KS at that time too; I changed my plugs to Denso Iridiums around the same time; I checked the codes last night after I got home and got 0505; I did NOT reset the ecu last week when I installed the Y, I reset it last night to see if it would make a difference; I have a FP gauge and noticed excellent pressure during the run; I have noticed a slight increase in temp from my EGT gauge since the Y but not anything crazy (I think); I took out the plugs last night and everyone of them look almost identical, no fouling, no blown tips, no sign of detonation; I did notice that the #4 cylinder extension (the part that replaces "spark wires" in our ignition)boot was torn and the extension separated into two pieces.

Can someone tell me if this will cause me to loose that much HP? My car starts, runs, and idles just fine. I don't feel a miss, I don't feel hesitation. The coil pack is held down by two bolts which leads me to believe that it's still making contact even though it's split like that. The only thing I can summize is that A: it's either arching at the top-end and thereby losing power or B: it's making sufficient contact and not the problem. I'm going to replace it anyway, but I was thinking outloud. I'm extremely frustrated and some of my maxima guys are stumped too.

Can anyone think of anything else I could check? Any suggestions are welcomed at this point. Thank you in advance for helping.

 

Replace the coil pack since you know it's messed up. Then go from there for the less obvious stuff.

 

Yea, I know. But do you think I would lose that much HP just from that?

 

Yes.

 

I would of never thought that much since the car is running fine. I wouldn't know there is anything wrong if it weren't for the dyno run. The car idles and runs fine.

 

I agree 13hp is a lot to lose from just the coil pack. Hey Jamie next time you guys go to the dyno be sure and let me know...I'm soooo ready

 

Son, we posted it all over the SE forum. Where ya been?...Absolutely, but I gotta find out what the problem with my car is before I go back.

 

Did you ever find out what the problem was ??

-matt

 

maybe your cat is dying? Do you have an R/T or a stock unit?

 

Was it the coil pack ??

-matt

 

clogged nitrous filter?

 

got a tank of bad nitrous?

 

I will answer for him, I think it was the coil pack for sure, cause he got a new one and then ran a 13.7 on just a 70 shot in an auto, when before he was running low 14's.