An honest report and dyno on my new headers...
08-10-2017, 01:01 PM
#1
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An honest report and dyno on my new headers...
OK, let me try and keep this kinda to the point...
A few months back, I made right about 660 RWP and 680s RWT with nice cool temps at the dyno at Westech.
I then ported my Snout and went back last month in 100 degree weather, both HP and TQ were off just a bit, 645-650 RWHP, 675-680 RWT. We figured the car was just down a bit due to terrible air compared to the cooler weather. Yes, I know that the correction factor should account for most of it, but starting off with such bad air seems like it may be hard to make the same power...
OK, went back to the Dyno the other day, again, 100 in dyno room, similar air. Changes this time are lower 180 stat, Cordes HX and BBE ceramic coated long tube headers.
Basically made the same HP, 648-650 RWHP, but pick up between 15-20 RWT, the car was making 700 RWT.
One more thing to note, we dropped down to 11.8 from 12.3 #s of boost, no back pressure from cats and stock exhaust manifolds, and still made more TQ, same HP...
Are the headers, or at least these headers worth it??
Other then having to explain to the forum why I made no more HP, just TQ, yes, I'm SUPER happy with the car overall. I did make some extra TQ, and the car is running cooler, and even though it's not really that much faster, it sure sounds like it is!!!
A HUGE bonus is that while cruising in open or closed mode on the BBE Exhaust, it's VERY civil, NO drone, but NASTY at WOT!! I now run the Full BBE system, headers, x pipe and Exhaust, no cats.
Here's a short and sweet dyno/couple of pulls video I put together with a few more shots from Morgan, who was kind enough to strike a few poses in front of the car for me at Venice Beach!!
A few months back, I made right about 660 RWP and 680s RWT with nice cool temps at the dyno at Westech.
I then ported my Snout and went back last month in 100 degree weather, both HP and TQ were off just a bit, 645-650 RWHP, 675-680 RWT. We figured the car was just down a bit due to terrible air compared to the cooler weather. Yes, I know that the correction factor should account for most of it, but starting off with such bad air seems like it may be hard to make the same power...
OK, went back to the Dyno the other day, again, 100 in dyno room, similar air. Changes this time are lower 180 stat, Cordes HX and BBE ceramic coated long tube headers.
Basically made the same HP, 648-650 RWHP, but pick up between 15-20 RWT, the car was making 700 RWT.
One more thing to note, we dropped down to 11.8 from 12.3 #s of boost, no back pressure from cats and stock exhaust manifolds, and still made more TQ, same HP...
Are the headers, or at least these headers worth it??
Other then having to explain to the forum why I made no more HP, just TQ, yes, I'm SUPER happy with the car overall. I did make some extra TQ, and the car is running cooler, and even though it's not really that much faster, it sure sounds like it is!!!
A HUGE bonus is that while cruising in open or closed mode on the BBE Exhaust, it's VERY civil, NO drone, but NASTY at WOT!! I now run the Full BBE system, headers, x pipe and Exhaust, no cats.
Here's a short and sweet dyno/couple of pulls video I put together with a few more shots from Morgan, who was kind enough to strike a few poses in front of the car for me at Venice Beach!!
Last edited by jbsblownc5; 08-10-2017 at 02:12 PM.
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08-10-2017, 01:38 PM
#5
Team Owner
Nice!
What size header's did you use. My 2 inch AR Jethot coated headers added about 35 rwhp over the stock exhaust. Gotta love the tuned sound. I agree on the cooler under hood temps are surely cooler getting the stock exhaust off and the very hot stock cats out from under the hood.and the new coated pipes.
Lighter and cooler.
My exhaust sounds much cleaner than stock then whales a tuned sound when wide open.
I'm making around 650 rwhp but less rwtq. With minimal mods. I have the stock pulley doing about 12 pounds of boost.
What size header's did you use. My 2 inch AR Jethot coated headers added about 35 rwhp over the stock exhaust. Gotta love the tuned sound. I agree on the cooler under hood temps are surely cooler getting the stock exhaust off and the very hot stock cats out from under the hood.and the new coated pipes.
Lighter and cooler.
My exhaust sounds much cleaner than stock then whales a tuned sound when wide open.
I'm making around 650 rwhp but less rwtq. With minimal mods. I have the stock pulley doing about 12 pounds of boost.
Last edited by 3 Z06ZR1; 08-10-2017 at 01:44 PM.
08-10-2017, 02:10 PM
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Nice!
What size header's did you use. My 2 inch AR Jethot coated headers added about 35 rwhp over the stock exhaust. Gotta love the tuned sound. I agree on the cooler under hood temps are surely cooler getting the stock exhaust off and the very hot stock cats out from under the hood.and the new coated pipes.
Lighter and cooler.
My exhaust sounds much cleaner than stock then whales a tuned sound when wide open.
I'm making around 650 rwhp but less rwtq. With minimal mods. I have the stock pulley doing about 12 pounds of boost.
What size header's did you use. My 2 inch AR Jethot coated headers added about 35 rwhp over the stock exhaust. Gotta love the tuned sound. I agree on the cooler under hood temps are surely cooler getting the stock exhaust off and the very hot stock cats out from under the hood.and the new coated pipes.
Lighter and cooler.
My exhaust sounds much cleaner than stock then whales a tuned sound when wide open.
I'm making around 650 rwhp but less rwtq. With minimal mods. I have the stock pulley doing about 12 pounds of boost.
08-10-2017, 06:54 PM
#10
Le Mans Master
Sounds great! Those pics are just down the street from me - too bad I wasn't walking by to help. LOL.
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08-10-2017, 07:34 PM
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08-10-2017, 08:20 PM
#13
Le Mans Master
Joel, thanks for your continued testing and honest posts of the progress, or lack thereof either way.
Judging by the fact your boost is lower, that shows you have less restriction, there is no way its making LESS power if it was in the SAME air quality.... (DA). Maybe not a huge gain but...something.
Down here, it seems most bolt on cars gain 20 rwhp with heads/ORX, you could easily lose that much power in a 2000' swing in DA.
Judging by the fact your boost is lower, that shows you have less restriction, there is no way its making LESS power if it was in the SAME air quality.... (DA). Maybe not a huge gain but...something.
Down here, it seems most bolt on cars gain 20 rwhp with heads/ORX, you could easily lose that much power in a 2000' swing in DA.
08-10-2017, 08:53 PM
#14
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That's a good one!!
You're very welcome, and yes, looking forward to cooler weather, but for now, having a ball with the car. I got stuck in stop and go traffic for 40 minute in 100 degree temps on the way home, the cars temps help up great with the AC rockin!
Joel, thanks for your continued testing and honest posts of the progress, or lack thereof either way.
Judging by the fact your boost is lower, that shows you have less restriction, there is no way its making LESS power if it was in the SAME air quality.... (DA). Maybe not a huge gain but...something.
Down here, it seems most bolt on cars gain 20 rwhp with heads/ORX, you could easily lose that much power in a 2000' swing in DA.
Judging by the fact your boost is lower, that shows you have less restriction, there is no way its making LESS power if it was in the SAME air quality.... (DA). Maybe not a huge gain but...something.
Down here, it seems most bolt on cars gain 20 rwhp with heads/ORX, you could easily lose that much power in a 2000' swing in DA.
08-13-2017, 06:30 PM
#15
Drifting
Joel,
Joe did my set up, ARH 1 7/8th, Upper/lower pulley, CPR HX/expansion tank, E85 and Meth and in 100 deg heat pulled 690+hp and 700+TQ. You are at sea level so that helps you as I was at 1800ft elevation. Joe did not give me my boost numbers but I agree the car is a blast to drive with those mods.
Joe did my set up, ARH 1 7/8th, Upper/lower pulley, CPR HX/expansion tank, E85 and Meth and in 100 deg heat pulled 690+hp and 700+TQ. You are at sea level so that helps you as I was at 1800ft elevation. Joe did not give me my boost numbers but I agree the car is a blast to drive with those mods.
08-14-2017, 12:49 AM
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Joel,
Joe did my set up, ARH 1 7/8th, Upper/lower pulley, CPR HX/expansion tank, E85 and Meth and in 100 deg heat pulled 690+hp and 700+TQ. You are at sea level so that helps you as I was at 1800ft elevation. Joe did not give me my boost numbers but I agree the car is a blast to drive with those mods.
Joe did my set up, ARH 1 7/8th, Upper/lower pulley, CPR HX/expansion tank, E85 and Meth and in 100 deg heat pulled 690+hp and 700+TQ. You are at sea level so that helps you as I was at 1800ft elevation. Joe did not give me my boost numbers but I agree the car is a blast to drive with those mods.
I have the 15% lower, stock upper size for now, but it is Joe's pulley he made for me, so I have the colar on that will take the 2.31 as well...
looks Westech's elevation is around 1250, the place I do my dyno.
Curious what boost you made, and how the car handles both upper and lower. I was really only looking to run both when I did straight line events, not for hard canyon runs or road racing.
08-14-2017, 11:35 AM
#17
Drifting
Joe or NicD may be able to chime in on the boost numbers they see in general with that set up but I don't remember them giving me details. I think Joe put a 9% lower since I already had the 2.31 upper pulley in place.
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08-14-2017, 11:57 AM
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"In honor of jpee"
Don't get me wrong, Joel, I'm not knocking the numbers, the headers or the methodology. What you seem to be saying is that, with the mods you have now (and the ones you most-recently put on the car), the headers make almost no difference on the dyno but for torque. Which seems to mean, the entire exhaust is maximized (or minimized) to its best point. I don't disagree with that at all.
And I seriously doubt you have the inclination, time or money to go try a different set of headers (those are Billy Boat, right? BBE seems like shorthand for "Billy Boat Exhaust") just to prove that different headers will not make a difference in rwhp, or better than the latest rwt. Your numbers stand as they are reported and it's a good piece of information. Thanks.
And I seriously doubt you have the inclination, time or money to go try a different set of headers (those are Billy Boat, right? BBE seems like shorthand for "Billy Boat Exhaust") just to prove that different headers will not make a difference in rwhp, or better than the latest rwt. Your numbers stand as they are reported and it's a good piece of information. Thanks.
Last edited by AORoads; 08-14-2017 at 12:19 PM.
08-14-2017, 12:06 PM
#19
Race Director
Thanks for posting. Good info.
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08-14-2017, 06:11 PM
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Don't get me wrong, Joel, I'm not knocking the numbers, the headers or the methodology. What you seem to be saying is that, with the mods you have now (and the ones you most-recently put on the car), the headers make almost no difference on the dyno but for torque. Which seems to mean, the entire exhaust is maximized (or minimized) to its best point. I don't disagree with that at all.
I would agree with the above, and now having driven it a bit more, SOTP says it feels faster, and REALLY sounds better!! I'm also making the same HP, 15-20 more TQ, at a half pound less boost...
And I seriously doubt you have the inclination, time or money to go try a different set of headers (those are Billy Boat, right? BBE seems like shorthand for "Billy Boat Exhaust") just to prove that different headers will not make a difference in rwhp, or better than the latest rwt. Your numbers stand as they are reported and it's a good piece of information. Thanks.
I would agree with the above, and now having driven it a bit more, SOTP says it feels faster, and REALLY sounds better!! I'm also making the same HP, 15-20 more TQ, at a half pound less boost...
And I seriously doubt you have the inclination, time or money to go try a different set of headers (those are Billy Boat, right? BBE seems like shorthand for "Billy Boat Exhaust") just to prove that different headers will not make a difference in rwhp, or better than the latest rwt. Your numbers stand as they are reported and it's a good piece of information. Thanks.
You're VERY welcome!
