Dyno Numbers

[BABY J]

Well - on the "his dyno" comment I can't see that Mike being trying to be coy about that one. I'm one of the N/A guys that have had $3000 B series heads on multiple flow benches and benches vary (http://www.importatlanta.com/forums/showpost.php?p=35813760&postcount=7). When I was selling that head I made sure I said "on DPRs flow bench it flowed x amount" b/c benches do vary.

On the 214whp CHART vs 200whp CHART I say that it's highly possible. We are already aggreeing that people have their software setup differently. Take that car that lays down 214@ MSPi - let's add an exhaust, and it then makes 222hp @ MSPi. If that car made 200whp @ BG before the exhaust, and strap it down again... it now makes 208whp @ BG. To me, I put the car on the strip and can tell you what the ET calculators say the car makes (roughly) after 10 good passes w/ a decent driver.

Are the CHARTS different? You fucking bet!! But the GAINS over the new baseline should be repeatable/measurable and should be close (for each respective dyno). When I look at my 168whp B18A graph next to my graph at The Dyno Guy, the "characteristics" for each line was the same... peaks and dips were in the SAME spots in the RPM range... altho the HP/TQ numbers were "off". (although I drove to Birmingham to the dyno from Nashville TN... parked the car, and was on the rollers 20 minutes later so my motor was hot and the graph shows 91 degrees at the time of the pulls)

I think that educating customers what a dyno ACTUALLY IS instead of what THEY think it is means more. And I think a lot of tuners don't take time for that.

I mean, I just BURIED a bolt-on JDM GSR swapped gutted and tuned EJ coupe last night in Nashville (if ur on tennspeed you can see the thread) from a 40 kick. PEAK HP is just that - PEAK. If you build high-strung motors that "peaks" a good number you better pray to God that under the curve you got something there or you will STILL get your ass handed to you as I showed last night and as I will be showing tonight after Burgers N Cream - LOL.

Of all the cars I've had tuned, my Mustang tuner was the only guy that focused on the power under the curve. He found 4 hp (peak) and I was like WTF??? 3 hours for that? He said "go drive the car". I got back to the lot and was grinning like a school boy. He said "fast?" I said this mother-fucker is faster than a faggot climbing a dick tree. The graphs didn't look like much (peak number), but under the curve it was a MUCH more responsive and fun car - I could tell that RIGHT away.

My .02.

And to keep it on topic - I appreciate the education on the stack location - I have seen youtube videos where shops hurting for space will have a single bay dyno, and have the stack in a completely separate room... so this is def interesting tidbits to pay attention to in the future.

[Formally...]

Of all the cars I've had tuned, my Mustang tuner was the only guy that focused on the power under the curve. He found 4 hp (peak) and I was like WTF??? 3 hours for that? He said "go drive the car". I got back to the lot and was grinning like a school boy. He said "fast?" I said this mother-fucker is faster than a faggot climbing a dick tree. The graphs didn't look like much (peak number), but under the curve it was a MUCH more responsive and fun car - I could tell that RIGHT away.

And to keep it on topic - I appreciate the education on the stack location - I have seen youtube videos where shops hurting for space will have a single bay dyno, and have the stack in a completely separate room... so this is def interesting tidbits to pay attention to in the future.

I have told customers that before also. Most people just want to see the peak numbers. Look at Mike's type r crx that we just put the cams in. I have seen people say damn all that money in cams and stuff to make 5 more whp. If you look at the power under the curve and actually drive the car it feels a lot better.

As for the stack being in different areas I somewhat understand that but I would like to do a test and see what kind of difference it makes. Like I said I normally only see a CF of 1.02 to 1.07.

[BABY J]

I have told customers that before also. Most people just want to see the peak numbers. Look at Mike's type r crx that we just put the cams in. I have seen people say damn all that money in cams and stuff to make 5 more whp. If you look at the power under the curve and actually drive the car it feels a lot better.

QFT.

Bc unless you road-race and your car lives at 95 - 100% throttle postion for an hour at at a time, how often are you at PEAK? Not long... and guess what turds.... when you DO get to peak in a drag race what happens next ... SHIFT!!! Wooops, now you are not at peak anymore... bummer dude. Now what do you have to rely on? The power under the curve.. you know... the part of the graph that you are not looking at while you were bragging about how much peak power you made? Yeah... THAT part. LOL. There is lots more into it than peak HP. Where do you make peak TQ - do you sustain it or does it fall off. How fast do you get there (gearing, vehicle weight). Can you drive? Etc.

I think this is a great topic. And I like what Charles said about the dyno not being a penis enlargement tool. I also like Identity_Crisis said about the dyno being a heartbreaker... both of those statements ring true. Awesome topic Brandon and kool that all the shops and guys w/ experience can chime in.