Ok, in all fairness, we'd be comparing apples for apples here. However, this comparison is compairing before and after of a ported eaton by Wes. The only other mod that was done was the JDM Phenolic spacer. Here's what's on the truck for Power Adder Mods:

JDM tuned chip, filter, 4lb lower, electric fan, cobra water pump, accufab throttle body, NGK TR6 plugs.

Here was my pull


Ok, had my blower ported by Wes, and while installed, I added the Phenolic Spacer kit from JDM. Of course this has been labled by some as a "useless mod", though i've seen it pick up a few numbers on the dyno on some trucks, nothing on others. This pull was made today with the same mods as above on the same tune, just adding the ported blower and spacer kit. The pull was mainly to check the a/f on it, which a "tail pipe sniffer" was used, although they are not the most accurate. Both pulls were made in very similar temps and weather conditions, both on dynojet dynos. Here's the new pull:


As you can see, the a/f is a bit lean, but my more leveled off. The power and torque curves seem to come on a bit quicker and hold a tad longer. All in all I picked up 20 hp to the rear wheels, and lost 11 ftlbs. A/F is at 12 right through the pull, a little lean for my taste. I'm gonna send the chip down to be richened up a little. All in all the blower obviously made a difference. Now that I have the right info, the hp increase was nice, but the loss on the torque peak number is definetly worth the broadness of the curve. You guys can draw your own conlusions on what you think. We'll see what the difference at the track is in a couple weeks when I head out after my chip is reburned.

This is as close to a perfect before and after as I can give you guys, only thing aside from the blower that changed was the spacer. I dont' have the barometer readings and temp readings but they were very close. I made two pulls after checking the a/f just to back it up. The numbers dropped minutely as you can see because the truck was hot.

 

thanks for the inputt. very interesting not as much gain as I would of thought.. good no.s though!!!


Dale

 

Don's Bolt maning the controls of the Tallimeca Mobile. Don came down to hang out. The dyno place was a little short on help so I asked Don to run the truck because i have never made a pull myself with it. Turns out after Don jumped in........neither had he. You think with all the hours he's logged at JDM he might have learned something

Thanks to Don for hanging out and giving me a hand with the truck

 

That Don will do anything to get his picture taken

Nice gain though, I believe you really have to spin the crap out of a ported eaton to see any large gains. I do and did.........hehe

 

That is exactly what JJ said at Cecil, hmm............
maybe it's time for a new lower pulley for Ronbo

Good info tallimeca, CONGRATS on the results
I would have loved to see the pulls made on the same dyno,
but either way this torque thing is very interesting indeed, it's outright weird how ONLY SOME L's do lose torque with a ported Eaton, yet other gain plenty of torque ??? WTF
First we saw it on the Apten, and now on the Wasp ?

Me I got the "Big Mother of Holes" ORIG WASP WOO HOO
I think mine would show diff results, but then again until I run as good as I use to, "ET wise", I aint making any judgements other than saying the seat of the pants, extra boost, extra whine, and Hi RPM pulling power is out right unmistakable.
I will say last years 12.0 at Cecil was 112.6 and this yrs 12.0 at Cecil was 113.5, so I did pick up power there is no doubt,
BUT I WANT MY 11.81 AND BETTER BACK

 

Thanks for this post / reality check.

It'll be next month til I can get on a dyno. One thing is for sure! My speeds at the track are up 3mph on avg. (Apten ported eaton)

Rich

 

It's very strange with the ported blowers like some have said. Some gain, Some lose, Some can tell very little difference. I had Apten port mine and experienced some nice gains HP/TQ wise. I can def. feel the difference and truly love the mod. I haven't went to the track yet but hopefully soon.

 

Do you think that part of the difference could be in tha A/F ratio? I notice on the first chart it was in the 10's and now around 12.

 

What kind of gas were you running? race or pump? octane rating?

 

I have very similar mods and I'm going to a dyno tuning session at JDM in a few weeks so we'll see what we get.

Question is..what kind of a program is on that chip? And yeah..what kind of gas were you running?

Thanks!!

 

Those results would disappoint me, giving away 20 ft-lb tq to gain 10 hp. Not a good trade on a heavy truck.

Glad I went with Apten, for my porting.

 

I think you hit the nail on the head. I have just a 4lb pulley. Eluzion dynod his on the same dyno, and we both dynod the same day down to JDM's. He had originally dynod with a 4lb lower and 2lb upper (or whatever it is). He added a 6lb lower with the port job and pickup up about 12 hp and 25ftlbs.

If anything, the numbers should be significantly higher by leaning out the mix that much. I'm going to have it richened up a little bit. Now, these pulls were done on my street side, so i'd be pulling more power on my strip side. I have a somewhat conservative tune, well, untill it leaned out.

Pulls were made on apprx a 50/50 mix of 93 and 104.

The program was custom duned on JDM's Dyno last year. Look at the original pull on the first dyno chart. That was your standard "mail order" tune. Then look at the second pull. 30hp and 70 ft lbs difference, still at a conservative a/f for the most part.

I'm not disappointed, but i'm not thrilled. I didn't honestly expect too much because the results have varied so much on these trucks with these ported blowers. If you look at the dyno charts the hp and torque curves do have a broader span on the pull. The gains seem to be in the higher rpm (4500 and up range), so my thought is by putting a larger lower on, or maybe a smaller blower pulley, maybe the gains will be picked up lower in the pull, which might bring the torque back up. Once my chip is reburnt, i can check my boost guage and see what the difference is. I didn't take notice at the dyno. To be honest, i'm expecting to see a loss in boost and that may explain the low torque numbers.

Sorry to burst your bubble , but the same thing happens with the Apten. It depends on what other mods you have. Quite a few guys have lost torque with the port, in fact i got in an argument with a guy just last week about it, thinking it was rediculous, turns out it's not that uncommon.

So all in all in all, the port is definetly doing something, i mean it leaned the **** out of my tune, but my curves seem to be much more fluent. I think the true secret to these ports is spinning the blower faster. All I can say is it is what it is. Hope this was of some help to some guys.

 

I look good in Red

 

I may add that my a/f was check at JDM's, they take out one of the o2 sensors and put the sensor right in the exhaust i believe, the a/f at this dyno was done by one of those sniffers stuck in the tail pipe. Not to throw this off topic but how relieable are those and what may be the difference.

 

Correct me if I'm wrong but the JDM sheet says STD correction and the latest test shows SAE correction. I don't know how you could compare the two.
Dale