link to compd thread,,,,
Ya I'd appreciate a link as I don't read there or what to go fishing for it, thanks
link to compd thread,,,,
It's been shown that a true 2.6 restrictor TUBE (maintained 2.6 diameter for 3 inches) flows far less than a clipped wheel, altered MWE groove charger that is currently 2.6 legal.... last year tests were done and max effort on charger was over 900 RWHP, with the restrictor tube and tuning adjustments, it was down to 650 RWHP. That I believe is a good comprise for stocks drivelines and limits how much HP dollars will buy you on a custom charger.
There was a discussion last year on CompD between myself and others and there were posted dyno results. The issue was turbo alteration businesses, and those that spent big money on "loophole chargers", lobbied for the "loophole" rules on chargers instead of a fair limiting restrictor.....(no money to be made in it).
Ya I'd appreciate a link as I don't read there or what to go fishing for it, thanks
No other changes were made to those trucks. Tuning changes alone would have gotten some of that back. That's why I was asking McRat if he would be willing to test just swapping out the restrictor AND tune for the change to see how much could be gained back That and the guy pushing them is also the one who sells them (again, I can read between the lines, and is the reason many would not trust the validity of the results, I was looking for a nuetral party....) I would do it myself, but I just have a stock LBZ charger, not really a good test for what we are trying to find, and don't have access to a "known dyno".
This was an early pull. I'd be willing to bet the bitching gets worse when the trucks currently under the knife show up for the first points hooks around the country.
I like to pull but i'm tired of all this sh!t. So am I and so are alot of others. I'm not foolish to believe a restrictor would eliminate the bitching (in fact initially it may even create some), but in the long run I think it would get rid of a LARGE portion of it. Most of the heated discussions over the past 2-3 years in diesel truck pulling have been about turbos....
Alright forgive me if this is a stupid question, but why not just have the workstock class and make it stock turbos only? People could still get big into it and mod stock turbos but nobody would be making much more the 600hp and there would still be a class for younger guys trying to get into the sport without the funding to dive all the way in.
If folk are seriously interested in seeing what can be done with 2.6" tube restrictor, I can perhaps get Casper to the dyno and test. Probably won't be right away, it will wait until my next dyno session. I'll get the engine at max effort, then put in the restrictor and re-tune. Dunno what charger it will be, but it would be a big one.
That would be a great idea to see if you come up with the same results we came up with. Every truck I test the tube on it keeps them around 705hp no matter the size of the turbo. The bigger the turbo the bigger it hurts the power. You are taking the map groove out of the equation because all the air is passing though this opening so you are creating a pretty good vacuum in front of the compressor wheel and it kills the chargers ability to work efficiently and creates tons of heat. The only thing I didn't try it on was a 66mm turbo to see how it acts. Let me know if you need the sizing of this restrictor tube for your testing.
No other changes were made to those trucks. Tuning changes alone would have gotten some of that back. That and the guy pushing them is also the one who sells them.
This was an early pull. I'd be willing to bet the bitching gets worse when the trucks currently under the knife show up for the first points hooks around the country.
I like to pull but i'm tired of all this sh!t.
You must be talking about BOB's IN circuit? Cause a couple CR dodges fairly well DOMINATED the BOB WS class down here in KY. There were a cpl dmaxes in the top 5 but very few wins if the two CR dodges showed up & didn't break. They're freakin stout!!!
Most places tho, the Dmax does in fact own the WS class. Especially when modified oem chargers (ie cheetahs) are allowed. That's not the case in BOB. they're stock unmodified, not just stock appearing.
Ok, so lets say this works out good, and it does everything its suppose too, limits the class to 700hp ish. Now we have a 550hp workstock class, a 700hp 2.6 class and a 1300hp 3.0 class. Then everybody starts jumping from 2.6 to workstock so they can beat up on that class. I thought this was a really good idea when 2.8 was around, seperated them two, but now that its gone, its making 2 other class close together again and a huge jump to 3.0. I guess thats just my honest opinion, i think the classes have good seperation now.