I dynoed my car at HRH again, and I was very disappointed with the outcome on my #'s.........

These are all my numbers over the last 2 years:

Stock with Direct Flow lid:
309 HP/321 TQ

Lid, ASP Pulley, 160 stat, new plug wires:
314.6 HP/332 TQ

Above, plus TTS LT's with cats, MAFT, MAF ends, cutout:
323 HP/332 TQ

Above, plus Thunder Racing 220 cam:
334.9 HP/342.2 TQ

Granted my car is a '98, but those are pretty dam crappy for the $$ put into the car !!!!!! What the hell..... spend 3k and get a whopping 10 ft/lbs of TQ... what a deal !!!!!! I really thought the cam was going to wake the car up since it had LT's already.......

I am getting 3-4 degrees of KR around 4k, which may be the problem. I've had KR before on my AutoTap and never really actively put in a strong effort to find out what was causing it. I assume thats what's holding this car back alot.

This is my plan.......
Run some fuel injection cleaner and change the fuel filter and see if I get lucky..... highly doubt it, but its simple thing that should be done anyway.
Get some higher octane fuel and see if the KR is real or false knock..........
If its false..... remove the ASP pulley and check it again......
If its real.... then what ??????????

Any other ideas about what is holding my car back so much ????

More info...... my car is an M6. I put in new springs, ( 918's I believe.), pushrods and lifters when the cam was put in. We did run an Air/fuel during the dyno and played with the MAFT to get it to around 13:1 ( 4% rich). Changing the MAFT didnt seem to change the #'s very much.

As far as track times.... I've only been to the track twice (both before the cam install) and I'm not much of a driver. I have a real hard time getting good 60's and spin the tires just about every time. With street tires, the best I've done is 13.41 @104.98with most of my 60's being right around 2.0-2.11 etc..... Like I said.. I cant launch an M6 worth a damn, and especially on street tires. Those times are dam slow for Sacramento CA

Car is a '98 with stock heads and stock intake. The above #'s are with the cutout capped. No codes.

The above numbers are on a DynoJet... the first one was at a different place than all the others. The rest were all done at the same place , on the same machine, same operator, no big difference in weather conditions..

I've considered an LS6 intake and/or LS1Edit, but so far every mod has been worthless for $$ to HP gains. I'm afraid I'm just throwing good $$ at bad. <img border="0" title="" alt="[Sad]" src="gr_sad.gif" />

 

Some cars just suck..... like mine for example. Then there are cars that are being held back by something.... I always choose to believe the latter, or else I would have given up on my car a while ago.

With that being said, there is probably something holding your car back. The whole "fun" of hotrodding is finding out exactly what that is.

Real HP numbers are made with COMBINATIONS not single Mods. This is especially true for NA cars. It is very tricky when modding your car to pick the right modifications that are going to give you the kind of gains that you expect.

I'm not saying that this is the case, but it is very possible that your cam is mismatched with your heads... or your LS1 intake is restricting the cam.... or your Y pipe is choking the exhaust.... or you have a fowled CAT holding up the exhaust.... or you just need a damn TNT kit. Whatever it is, the whole frustration with modding your car is getting all the parts to work with eachother so that you will get the kind of dyno numbers that you see plastered across these boards every day.

I dynoed 356 HP with a FULLY modded stage II h/c through stock exhaust. To say the least, yeah, I was frustrated. I practically kicked the car on the dyno. There's more HP in there somewhere, I just have to find it. <img border="0" title="" alt="[Big Grin]" src="gr_grin.gif" />

Good Luck,
<img border="0" alt="[cheers]" title="" src="graemlins/gr_cheers.gif" />

 

Isn't 13:1 a little on the lean side on a dyno? Not enough to make a huge differenc, though. If I were you I would definitely get rid of the cats. I bet you pick up 10 rwhp just from that alone. Also, make sure your TTS headers aren't touching the car anywhere on the passenger side. My friend has them and they look like they are touching the car at the first bend of the primaries. Also, you may have a bad knock sensor. My '99 did and I also had 4 degrees of KR. There is a TSB??? on them on some model years.

Derrick