Buschur Racing dyno thread.....new developments.
, just because he has to know.
Originally Posted by davidbuschur
You know, sometimes I get my best ideas at night. This really sucks for me as I don't usually sleep well. As a side note I have taken up drinking some wine before I go to bed and this seems to help
So, last night I am laying in bed sleeping well. Dreaming of the dyno, really, this is how my messed up brain works. Then all of a sudden, since I am asleep and not being bothered by 10 people at once, I get this freaking thought. Why the hell did the car pick up 15 whp with an axle back and not gain anything from the cat and downpipe?! Then my mind, while talking to itself in this dream answers back, "The cat back pipe dumbass." At this point I wake up and walk to the kitchen to get a note pad. Write myself a note, "Get rid of the catback pipe with the two restrictive resonators in it dumbass."
I spend tons of time talking about how to build a correct exhaust for a car. Straight through, no resonators, no baffles, always go from a smaller tube to a larger, never the other way. Here I am picking up great gains with an axle back and non with something in front of it. The cat back pipe while not too bad (I thought) still has only 2.25" diameter and also has two resonators in it which is what keeps it quiet.
Monday morning I am going to drop the exhaust at the back of the offroad pipe for another dyno run on the AFC. I think the problem with no additional power being made is from the catback pipe.
Now I won't be able to sleep tonight, I have to know......
David Buschur
www.buschurracing.com
So, last night I am laying in bed sleeping well. Dreaming of the dyno, really, this is how my messed up brain works. Then all of a sudden, since I am asleep and not being bothered by 10 people at once, I get this freaking thought. Why the hell did the car pick up 15 whp with an axle back and not gain anything from the cat and downpipe?! Then my mind, while talking to itself in this dream answers back, "The cat back pipe dumbass." At this point I wake up and walk to the kitchen to get a note pad. Write myself a note, "Get rid of the catback pipe with the two restrictive resonators in it dumbass."
I spend tons of time talking about how to build a correct exhaust for a car. Straight through, no resonators, no baffles, always go from a smaller tube to a larger, never the other way. Here I am picking up great gains with an axle back and non with something in front of it. The cat back pipe while not too bad (I thought) still has only 2.25" diameter and also has two resonators in it which is what keeps it quiet.
Monday morning I am going to drop the exhaust at the back of the offroad pipe for another dyno run on the AFC. I think the problem with no additional power being made is from the catback pipe.
Now I won't be able to sleep tonight, I have to know......
David Buschur
www.buschurracing.com
Later,
Keith
Finally, Monday morning
We are going to dyno the car with the open downpipe first, see if it picks up. If it does then I am going to have to fab up a quick 2.5" catback pipe to see what happens. Then I am going to reverse the offroad pipe/downpipe back to stock and see what HP it takes away.
Should be a fun day.
David Buschur
www.buschurracing.com
We are going to dyno the car with the open downpipe first, see if it picks up. If it does then I am going to have to fab up a quick 2.5" catback pipe to see what happens. Then I am going to reverse the offroad pipe/downpipe back to stock and see what HP it takes away.
Should be a fun day.
David Buschur
www.buschurracing.com
Well, the results were amazing. The car at the top end went from 279 whp to 314 whp, thats a 35 whp gain. The restriction was in the catback pipe with the two resonators, just as I thought.
I am not going to bother building a 2.5" catback pipe. I feel as though the Stage 0 is priced right at $995. The axle back muffler is $260 and gained 15 whp. Building a complete 2.5" catback system isn't going to be much cheaper than our 3" catback which is $450. I think anyone that needs to upgrade from Stage 0 will be better off just running the 3" catback, even if it is in conjunction with the 2.5" downpipe/offroad pipe they got in Stage 0.
I am going to run the car again in a few minutes with the 3" catback bolted to the 2.5" downpipe/offroad pipe and then bolt the stock cat and then the stock downpipe back on the car. I will be able to tell how much the car looses by doing this and see what the gains would be.
Pretty cool stuff. This is what the dyno is good for.
David Buschur
www.buschurracing.com
I am not going to bother building a 2.5" catback pipe. I feel as though the Stage 0 is priced right at $995. The axle back muffler is $260 and gained 15 whp. Building a complete 2.5" catback system isn't going to be much cheaper than our 3" catback which is $450. I think anyone that needs to upgrade from Stage 0 will be better off just running the 3" catback, even if it is in conjunction with the 2.5" downpipe/offroad pipe they got in Stage 0.
I am going to run the car again in a few minutes with the 3" catback bolted to the 2.5" downpipe/offroad pipe and then bolt the stock cat and then the stock downpipe back on the car. I will be able to tell how much the car looses by doing this and see what the gains would be.
Pretty cool stuff. This is what the dyno is good for.
David Buschur
www.buschurracing.com
Can you run the car with the BR downpipe & just the stock cat, without the cat back pipes & mufflers. Really curious to see how much of that 35hp gain was the actual cat back pipe versus just the cat alone.
Maybe you can also run the BR downpipe, no cat and the stock cat back pipe with resonators and see if the numbers add up between the two scenarios above.
Thanks!
Maybe you can also run the BR downpipe, no cat and the stock cat back pipe with resonators and see if the numbers add up between the two scenarios above.
Thanks!
xtnct.
I ran the car with the 2.5" downpipe and no cat on that last test, so the restriction I am guessing was in the stock catback pipe.
The next test will be the 3" catback bolted to our 2.5" downpipe and offroad pipe. Then I am going to add the stock cat back in and see how much power we loose and then put the stock downpipe on and see how much we loose again.
I will then put a 3" downpipe/offroad pipe in and note the differences in spool up and power between a 2.5" combo and a 3" combo. This will put an end to all the "which is better discussions".
I will then be doing testing on the 3" highflow cat and last the differences between HP on the Magnaflow muffler and the BR muffler.
We tested once before with the BR muffler and a staight pipe and there was no difference. Actually I think the HP fell with the straight pipe on by a HP or two.
David Buschur
www.buschurracing.com
I ran the car with the 2.5" downpipe and no cat on that last test, so the restriction I am guessing was in the stock catback pipe.
The next test will be the 3" catback bolted to our 2.5" downpipe and offroad pipe. Then I am going to add the stock cat back in and see how much power we loose and then put the stock downpipe on and see how much we loose again.
I will then put a 3" downpipe/offroad pipe in and note the differences in spool up and power between a 2.5" combo and a 3" combo. This will put an end to all the "which is better discussions".
I will then be doing testing on the 3" highflow cat and last the differences between HP on the Magnaflow muffler and the BR muffler.
We tested once before with the BR muffler and a staight pipe and there was no difference. Actually I think the HP fell with the straight pipe on by a HP or two.
David Buschur
www.buschurracing.com
Moving right along here, real time data
Put a 3" catback on the car. It is super *** cold in the dyno bay and the car is hitting fuel cut on the way up at about 4,000 rpm. So when I finally post the dyno sheets for all this there is going to be a dip in them....data is still good, just explaining what is going on.
With the 3" catback bolted to the 2.5" downpipe and 2.5" offroad pipe the midrange is better in quite a few spots by 10 whp or so than with a completely open exhaust right off the offroad pipe. The peak HP happens sooner with the catback exhaust on the car and came in at 313 whp, compared to 314.4 whp with the open exhaust.
We are bolting the stock cat back in place right now and will have more results shortly.
This testing seems so elementary compared to all the high tech things we could be doing. It is just so we can offer hard data and possibly improve the packages we are offering compared to what we collected for data with the old prototype pieces thrown on the car 2 years ago.
I would like to see where we can take this Stage 0 in emmission legal form.
David Buschur
www.buschurracing.com
Put a 3" catback on the car. It is super *** cold in the dyno bay and the car is hitting fuel cut on the way up at about 4,000 rpm. So when I finally post the dyno sheets for all this there is going to be a dip in them....data is still good, just explaining what is going on.
With the 3" catback bolted to the 2.5" downpipe and 2.5" offroad pipe the midrange is better in quite a few spots by 10 whp or so than with a completely open exhaust right off the offroad pipe. The peak HP happens sooner with the catback exhaust on the car and came in at 313 whp, compared to 314.4 whp with the open exhaust.
We are bolting the stock cat back in place right now and will have more results shortly.
This testing seems so elementary compared to all the high tech things we could be doing. It is just so we can offer hard data and possibly improve the packages we are offering compared to what we collected for data with the old prototype pieces thrown on the car 2 years ago.
I would like to see where we can take this Stage 0 in emmission legal form.
David Buschur
www.buschurracing.com
Another test done.
Now the car has the stock cat on it, 2.5" downpipe and a 3" catback with the remainder of Stage 0 on it. The car made 293 whp like this. So the cat was a restriction and much more of one than I thought it would be.
Funny that removing it with the restrictive factory catback pipe made little difference, actually it's not funny as I am constantly preaching to people that you HAVE TO DO MODIFICATIONS IN THE CORRECT ORDER! This is the great proof needed for what I babble about.
Back to the test. Run right before this one had a 2.5" downpipe, 2.5" offroad pipe and our 3" cat back. Car made 313 whp. Put the factory cat back in place and the horsepower dropped to 292, a 21 whp difference.
For comparison. 2.5" downpipe, stock cat, stock catback pipe with the 2.5" axle back muffler the car made 289.3.
Looking at it this way you can see why you always start in the rear of the car and work towards the engine when doing exhaust one piece at a time.
We are bolting on the stock downpipe now with the stock cat and we'll see if the power is effected.
After that we bolt the full 3" downpipe, offroad pipe and catback on the car. This will give us a full turbo back whp gain number and we can do some comparisons between spool up, torque and HP using the 2.5" downpipe vs. the 3".
I love this stuff.
David Buschur
www.buschurracing.com
Now the car has the stock cat on it, 2.5" downpipe and a 3" catback with the remainder of Stage 0 on it. The car made 293 whp like this. So the cat was a restriction and much more of one than I thought it would be.
Funny that removing it with the restrictive factory catback pipe made little difference, actually it's not funny as I am constantly preaching to people that you HAVE TO DO MODIFICATIONS IN THE CORRECT ORDER! This is the great proof needed for what I babble about.
Back to the test. Run right before this one had a 2.5" downpipe, 2.5" offroad pipe and our 3" cat back. Car made 313 whp. Put the factory cat back in place and the horsepower dropped to 292, a 21 whp difference.
For comparison. 2.5" downpipe, stock cat, stock catback pipe with the 2.5" axle back muffler the car made 289.3.
Looking at it this way you can see why you always start in the rear of the car and work towards the engine when doing exhaust one piece at a time.
We are bolting on the stock downpipe now with the stock cat and we'll see if the power is effected.
After that we bolt the full 3" downpipe, offroad pipe and catback on the car. This will give us a full turbo back whp gain number and we can do some comparisons between spool up, torque and HP using the 2.5" downpipe vs. the 3".
I love this stuff.
David Buschur
www.buschurracing.com
Never getting an AWD dyno. As a matter of fact had this one been easier to pull out of the ground I would have sold it a couple months ago.
David Buschur
www.buschurracing.com
David Buschur
www.buschurracing.com
What doesn't make much sense? The dyno sale or some of the information posted?
David Buschur
www.buschurracing.com
David Buschur
www.buschurracing.com