I having 383LQ4SS post my dynos on line for me.. Make sure you look at the dates..

<img src="http://www.torquehorsepower.com/car/T1.jpg" alt=" - " />

This dyno was done with a vacuum leak and rocker arms hitting and 29 degrees of timing. We used the maft to get the a/f close. We found out I had a vacuum leak post the dyno using a tech2 and that was the reason why we could not get the a/f right post 4 dynos. Also we noticed the sudden falloff past 6600rpm. Which was not there b4..
<img src="http://www.torquehorsepower.com/car/226.jpg" alt=" - " />

This is with the 226 XE-R post new shortblock and heads being repaired. There was a lot of oil in my exhaust and we think plenty in the muffler.. Crazy smoke when we fired her up.. Anyway.. Look at the mad loss of tq and horsepower below 4k rpm.. Something is wrong for sure. Chris Pippy think it is exhaust related. Also my timing was 26 degrees on this dyno.. Could this just be tuning and exhaust for the loss in power? Your opinions are welcomed..

<small>[ August 02, 2002, 02:06 AM: Message edited by: VINCE ]</small>

 

Well, Vince, I sure don't know myself but I will probably have a thread like this going soon so I hope it works for ya.

 

Vince, maybe my eyes are deceiving me or I'm not looking at something correctly... Those two graphs look pretty much identical, but just scaled differently... The TQ numbers look the same on both graphs @ 2500, 3000, 3500, etc...

I don't look at dyno graphs often though, so maybe I'm missing something obvious. <img border="0" title="" alt="[Embarrassed]" src="gr_emb.gif" />

 

Vince,

My graph looks more compressed and making it look like more of a drop in the middle. Best thing to do is see if you can get a numbers printout in 100 RPM increments for the Tune Tech runs so I can compare them to what we have here. It is much more accurate than looking at these two graphs. We will also see what comes out of Weds with the cutout runs and the new PCM.

Mike

 

scaling looks to be wiggy to me too. I still think tuning and a new muffler/cutout will get you a ton.
Cheers,
Chris

 

Can you give us a full mod list Vince?

It looks like your setup is exhaust restricted and more than likely in less than optimal tune. Get that timing up, lean her out a bit and open up the exhaust and I bet you will find 20 rwhp.

 

I am up.. Well the pictures are off secondary to my buddies ftp did not put the lines in and took out the color.. The scale is off as well. I used a ruler to see what the difference was. On the T1 dyno I was at 195rwhp/340rwtq at 3000rpm. On the 226 XE-R dyno I am at 180rwhp/318rwtq at 3000rpm. At 3500rpm with the T1 I was at 240rwhp/370rwtq. At 3500rpm with the 226 XE-R I was at 225rwhp/335rwtq. By 4000rpm with the T1 I was at 295rwhp/385rwtq. By 4000rpm with the 226 XE-R I was at 285rwhp/375rwtq. By 4500rpm with the T1 I was at 335rwhp/392rwtq. 4500rpm with the 226 XE-R I was at 330rwhp/385rwtq. Peak tq hit at 4800rpm on both and by 5k both cams were dead even. Mike Norris I will email you a file of my dyno runs from Tunetech. Maybe you can look at the #'s from that.. I personally thought with the faster ramp cams you are not suppose to lose that much under the curve.. Anymore suggestions..

 

My mod list is basically what I have in my sig with the addition of pulleys, SLP Dual Dual Exhaust, Centerforce flywheel, stock aluminum driveshaft, unopened cutouts, and soon to be corrected Ed Wright tune b4 I get ls1edit done. Am I missing something?

 

I think you will have issues adjusting Eds tuning. He locks it now I believe so you cant use LS1 edit on it. I would get a stock reflash and then start with LS1 edit fresh.
Chris

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by VINCE:
<strong>Maybe you can look at the #'s from that.. I personally thought with the faster ramp cams you are not suppose to lose that much under the curve.. Anymore suggestions..</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Faster ramps will get you some more power under the curve, but at lower rpms the larger intake and exhaust duration is not optimal for cylinder filling (specifically you have more overlap than with the smaller 221 duration of the T1).

 

I am getting another pcm for ls1edit. I will have Valvegod send it to Thunder for me. Chris you have mail. I've seen people change cams and not lose as much as I did under the curve.. I think the under curve is more tuning, but my peak should not be peaking that early.. I should have rec'd atleast 25rwhp from these heads minus cutouts. So far I see only 12rwhp..

 

You are forgetting your crappy exhaust. I would say you are right on the edge of that exhausts efficiency so you wont see much more without the cutouts/different muffler config.
Also I'd say tuning will your whole curve not just areas under the peaks <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
Chris

<small>[ August 02, 2002, 01:43 PM: Message edited by: Chris ARE 360 ]</small>

 

</font><blockquote><font size="1" face="Verdana, Helvetica, sans-serif">quote:</font><hr /><font size="2" face="Verdana, Helvetica, sans-serif">Originally posted by Chris ARE 360:
<strong>You are forgetting your crappy exhaust. I would say you are right on the edge of that exhausts efficiency so you wont see much more without the cutouts/different muffler config.
Also I'd say tuning will your whole curve not just areas under the peaks <img border="0" title="" alt="[Smile]" src="gr_stretch.gif" />
Chris</strong></font><hr /></blockquote><font size="2" face="Verdana, Helvetica, sans-serif">Ive seen the Dual/Dual flow very decently and not lose more than a handful of horsepower compared to a cutout at heads cam level. His muffler may be damaged from the oil mishap though, and that could cause a power loss I bet. Either way, Chris is right in that you have some more power to be had by improving the exhaust system Vince!

 

1. Dyno adj the timing to get "whats right for your car".
2. Open up the exhaust, a resricted exhaust will net restrictive numbers.
3. Fix the blow by first and worry about the other stuff later. Fix whats broke and THEN we can worry about the "if's, but's and what about's".

Good luck.

 

Blow By? That was with the last engine Raughammer.. Right now I have no engine problems that I know of.. My engine feels strong. I am going to work on the surroundings first.. I want to make sure she is ready for ls1edit by the 23rd.. I do not want any obstacles..

 

My bad... I guess I should have read more thoroughly. sorry.

Open the exhaust up... get a killer tune on the PCM, go kick ***... in that order.

Good luck!

Campbell

 

I speed read myself.. No biggie John... I hope my dual cutouts in my y-pipe works well with my combo..