My Predator Analysis ATTN: Ken........
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My Predator Analysis ATTN: Ken........
I installed the predator files into my early 99 PSD. Some big changes here as compared to the SCMT.
EGTs are higher. I first loaded in the 85HP file. Boost comes quickly, and so do EGTs, it was nothing to walk it up to 1200, and 25 PSI of boost. Power felt good, but somewhat choked off as the RPMs climbed, (Ken's theory that the AIS could be holding me back, when I posted my SCMT thoughts a few days back). when I got on it a few times I would hear a ROAR from the engine like it slipped into neutral for a sec, like it hit the rev limiter. This scared the crap out of me, thought something let loose. But it seems it may have been a shifting problem, like it was caught between gears. I tried it with "hard shifting" later and it seemed much better.
I then tried the 60HP. This felt awesome. shifted great. great torque and power. EGTs were lower, and would willingly chirp the tires, as did the 85HP.
Next was the 100 HP. This was somewhat disappointing. EGTs were actually lower than the 85HP one. Boost maxed out lower at 22 PSI. Again it felt like it was being choked. (Kens AIS theory). A full throttle blast clicked on a SES light for a few seconds, then it went out. I scanned it when I stopped, but no DTCs were set.
So far the 60HP and the 85 HP are my favorites,a nd I think the hard shift solved the 85HP slip?? Just that the 85 HP felt slightly choked off. Not sure what to think of the 100HP.
I am waiting on my Donaldson filter and I will re-test with an open element intake, and remove the AIS. Ken, it seems more like you may have nailed it that the AIS could be holding me back..........
your thoughts would be appreciated. Anything surprize you here? Any thoughts on the 100 HP setting, and the SES light flash? I was really surprized that the 100 HP took longer for EGTs to climb, and peaked lower than the 85HP one.
Thank you all for the input!
Eric
Early 99 PSD, AIS intake, stock straight exhaust with a Walker BTM
EGTs are higher. I first loaded in the 85HP file. Boost comes quickly, and so do EGTs, it was nothing to walk it up to 1200, and 25 PSI of boost. Power felt good, but somewhat choked off as the RPMs climbed, (Ken's theory that the AIS could be holding me back, when I posted my SCMT thoughts a few days back). when I got on it a few times I would hear a ROAR from the engine like it slipped into neutral for a sec, like it hit the rev limiter. This scared the crap out of me, thought something let loose. But it seems it may have been a shifting problem, like it was caught between gears. I tried it with "hard shifting" later and it seemed much better.
I then tried the 60HP. This felt awesome. shifted great. great torque and power. EGTs were lower, and would willingly chirp the tires, as did the 85HP.
Next was the 100 HP. This was somewhat disappointing. EGTs were actually lower than the 85HP one. Boost maxed out lower at 22 PSI. Again it felt like it was being choked. (Kens AIS theory). A full throttle blast clicked on a SES light for a few seconds, then it went out. I scanned it when I stopped, but no DTCs were set.
So far the 60HP and the 85 HP are my favorites,a nd I think the hard shift solved the 85HP slip?? Just that the 85 HP felt slightly choked off. Not sure what to think of the 100HP.
I am waiting on my Donaldson filter and I will re-test with an open element intake, and remove the AIS. Ken, it seems more like you may have nailed it that the AIS could be holding me back..........
your thoughts would be appreciated. Anything surprize you here? Any thoughts on the 100 HP setting, and the SES light flash? I was really surprized that the 100 HP took longer for EGTs to climb, and peaked lower than the 85HP one.
Thank you all for the input!
Eric
Early 99 PSD, AIS intake, stock straight exhaust with a Walker BTM
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After pondering...........I am wondering:
could it be that the lower EGTs in the 100HP, (higher EGTs in the 85HP file) file are because there is now more fuel?
Could it be that the 85HP file makes its power by adding more boost, and the 100HP file makes its power only by adding more fuel? 85HP=25 psi, 100HP=22 psi.
hmmm
Eric
could it be that the lower EGTs in the 100HP, (higher EGTs in the 85HP file) file are because there is now more fuel?
Could it be that the 85HP file makes its power by adding more boost, and the 100HP file makes its power only by adding more fuel? 85HP=25 psi, 100HP=22 psi.
hmmm
Eric
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From: Enjoying the real world.
Please give a guy some time to answer.... 
The simple answer is that your truck is getting more fuel than it's able burn, you may want to check to see if the cetane rating of the fuel is 45 or better. The 100HP isn't doing anything different than the 85HP, 60HP, etc. They all increase boost by increasing fueling and changing fuel timing (because with a turbo charger the thing that produces boost is exhaust velocity and that the only thing that causes that is fuel burning).
While its an oversimplified explanation, the higher horsepower tunes put in more fuel than the lower tunes and change the timing a little more. Depending on your altitude, cetane rating, fuel type, etc., your truck may not be able to burn all the fuel. Remember, when Diablo says 100HP they mean it so its up there in power. They dyno'd it at 98 RWHP --- Superchips, has been, uhmmmm.... optimistic with their ratings.
The simple answer is that your truck is getting more fuel than it's able burn, you may want to check to see if the cetane rating of the fuel is 45 or better. The 100HP isn't doing anything different than the 85HP, 60HP, etc. They all increase boost by increasing fueling and changing fuel timing (because with a turbo charger the thing that produces boost is exhaust velocity and that the only thing that causes that is fuel burning
).While its an oversimplified explanation, the higher horsepower tunes put in more fuel than the lower tunes and change the timing a little more. Depending on your altitude, cetane rating, fuel type, etc., your truck may not be able to burn all the fuel. Remember, when Diablo says 100HP they mean it so its up there in power. They dyno'd it at 98 RWHP --- Superchips, has been, uhmmmm.... optimistic with their ratings.
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From: La Vernia, Texas
I have to agree with Ken. I ran all of the Predator programs on a chasis dyno and came away with numbers that were within an acceptable margin. The margin could be due to air quality, air temp, intake temp and even cetane rating...etc
Not sure if it makes a diference but I am running an open element filter straight off of the turbo intake. My goal was to eliminate an bends and consequently turbulence in the intake track and I believe it paid off with some damn good numbers.
I also have the wastegate disabled and am using an adjustable pressure relief valve so that the MAP sensor only "sees" about 20 PSI. This mod enabled me to get about 25.5 PSI on the stock turbo with the 100 HP tune.
Not sure if it makes a diference but I am running an open element filter straight off of the turbo intake. My goal was to eliminate an bends and consequently turbulence in the intake track and I believe it paid off with some damn good numbers.
I also have the wastegate disabled and am using an adjustable pressure relief valve so that the MAP sensor only "sees" about 20 PSI. This mod enabled me to get about 25.5 PSI on the stock turbo with the 100 HP tune.
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I appreciate the time guys! I understand that this varies from day to day, truck to truck, and is dependant on a wide variety of factors.
However, am I correct in regards to having higher EGTs with the 85HP program? that the 100HP program is giving more fuel than the 85HP one, which also helps to bring EGTs down? and the opposite with the 85HP.
And actually after running the 100HP one for a day or so, it really goes great, and does have a ton of power, and I really like the hard shifts! Not too hard to be uncomfortable, but very authoritative.
Ken, do you have any experience seeing, or using the PowerValve? I was thinking of placing an order for one from you......
BTW, going to try the Tymar style intake now..........
Thanks Eric
However, am I correct in regards to having higher EGTs with the 85HP program? that the 100HP program is giving more fuel than the 85HP one, which also helps to bring EGTs down? and the opposite with the 85HP.
And actually after running the 100HP one for a day or so, it really goes great, and does have a ton of power, and I really like the hard shifts! Not too hard to be uncomfortable, but very authoritative.
Ken, do you have any experience seeing, or using the PowerValve? I was thinking of placing an order for one from you......
BTW, going to try the Tymar style intake now..........
Thanks Eric
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From: Enjoying the real world.
Diesels:
more fuel = more power
more air = cooler EGTs
Disabling the waste gate can certainly help --- its job is to limit boost (ie, limit power!). Also, open up the intake and exhaust --- you need all the air you can get for it to breath well, especially if you're high above see level. The excess smoke may be due to low cetane, inadequate breathing, etc.
Sorry to be so brief, but I've answered these type of questions before and I'm really short handed right now. We have an employee with a family emergency at the same time my wife (who also works for Motorhaven) took the kids to see their grandmother. The search function in the new forum software is fully operational as of last night!
"waste gate")likely that you're just not getting enough
more fuel = more power
more air = cooler EGTs
Disabling the waste gate can certainly help --- its job is to limit boost (ie, limit power!). Also, open up the intake and exhaust --- you need all the air you can get for it to breath well, especially if you're high above see level. The excess smoke may be due to low cetane, inadequate breathing, etc.
Sorry to be so brief, but I've answered these type of questions before and I'm really short handed right now. We have an employee with a family emergency at the same time my wife (who also works for Motorhaven) took the kids to see their grandmother. The search function in the new forum software is fully operational as of last night!
"waste gate")likely that you're just not getting enough
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Another experienced user enlightened me............something I new all along was not optimum, but I didnt realize how much........
My exhaust is definately substandard for the high programs of the Predator.
I still have the stock exhaust, and thought, (due to budget), that just a straight through muffler would do the trick, at least for now. And it did, to a certain point.............
For example, you could blind fold me, and choose between the 60HP and 100HP programs with the Predator right now, and I MAY not be able to distingush one from the other right now, if I were to drive it.
But its pretty simple, the higher programs are adding more fuel, and my exhaust is only flowing enough for so much fuel. So I am hoping that a new system will add a substantial gain to the Predator programs.
a 4in Magnaflow system SS
BTW, I switched back to my open element, and ditched the AIS, didnt really notice a huge difference.............
Eric
My exhaust is definately substandard for the high programs of the Predator.
I still have the stock exhaust, and thought, (due to budget), that just a straight through muffler would do the trick, at least for now. And it did, to a certain point.............
For example, you could blind fold me, and choose between the 60HP and 100HP programs with the Predator right now, and I MAY not be able to distingush one from the other right now, if I were to drive it.
But its pretty simple, the higher programs are adding more fuel, and my exhaust is only flowing enough for so much fuel. So I am hoping that a new system will add a substantial gain to the Predator programs.
a 4in Magnaflow system SS
BTW, I switched back to my open element, and ditched the AIS, didnt really notice a huge difference.............
Eric
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From: La Vernia, Texas
Yes.... a bigger exhaust will definately help but I realized close to a 100 HP gain with the stock system. A bigger exhaust's biggest benefit is lower EGT's and a pretty cool sound, the low EGT's will really come into play this summer and when I tow my car to Virginia so I will not be running the 100 HP tune then but will more than likely stick with the 60 HP tune.