Hit the dyno again.... - Miata Turbo Forum - Boost cars, acquire cats.

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Old 11-18-2008, 04:07 PM   #1
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Default Hit the dyno again....

Had an opportunity to hit the dyno again. Thought I would see what a bit more boost would get me. This is the same setup as before, but think I have a problem. The last time I hit 277 rwhp ( https://www.miataturbo.net/forum/t25700/ ). This time I ran 3# more boost on the same setup and the same number. First pull was 260, but it was extremely rich, we ended up with 277 after I leaned it out quite a bit. Seems to feel a bunch stronger, but the numbers don't lie. Any ideas about why this would be? Here's the video, enjoy.


Last edited by JayL; 11-18-2008 at 07:21 PM.
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Old 11-18-2008, 04:08 PM   #2
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Same dyno and whatnot, same correction factor as before, if any?
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Old 11-18-2008, 04:18 PM   #3
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peak numbers dont mean much... what's the curve look like?
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Old 11-18-2008, 04:28 PM   #4
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was the IN @ RR set at [email protected] for both?

I believe it's the rolling resistance (RR) of 25% of energy consumption for a vehicle moving at 100kph/62mph.
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Old 11-18-2008, 07:17 PM   #5
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Here's a copy of the dyno chart. The [email protected] says [email protected] on this chart and on my older one it was [email protected] What does this mean and what should it have been at?
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Hit the dyno again....-november-dyno-day.jpg  
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Old 11-18-2008, 07:38 PM   #6
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You're running 13.6:1 in boost?
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Old 11-18-2008, 07:43 PM   #7
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Originally Posted by patsmx5 View Post
You're running 13.6:1 in boost?
Nope, that's how much boost I was seeing. On that run, the A/F was extremely rich and off the chart. I leaned it out after every run, but we halted everything when it wasn't making the power it should have.
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Old 11-18-2008, 07:59 PM   #8
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Ah, that makes more sense. Yeah, I dunno why your car isn't making more power, if indeed it is not. I got that same BOV for my 99'. Car is super clean. If I were rich, that's how my NB would look. Maybe college will pay off one day. As I'm sure you know, intake manifolds are all the rage these days. I'm awaiting the dyno plots, but a member here recently dyno'd his 99' w/ a stock intake manifold, then swapped it for a 99' manifold w/ gutted out vics chamber. And he made more power. I'll be doing this soon. You 01+ guys could do the same.
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Old 11-18-2008, 08:29 PM   #9
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Pat, do you have a link to that intake info.
That is interesting to me, now that I have to pull my car apart..

Jay, was there a huge difference in temp outside or humidity or something strange like that?
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Old 11-18-2008, 09:06 PM   #10
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Quote:
Originally Posted by TURNS101 View Post
Pat, do you have a link to that intake info.
That is interesting to me, now that I have to pull my car apart..
The before and after numbers are:
264hp/262ftlbs
275hp/263ftlbs


Build Details
Motor yr/displacement: 95 1.8l
Head: stock 99
Intake manifold: stock 99
Exhaust manifold: AbsurdFlow Tubular
Exhaust size/style: Bellmouth 3" AbsurdFlow
FMIC core: 18x12x3
Turbo: GT2560R
Boost: 15psi

Still waiting for the dyno files but it was obvious that the stock intake is a restriction at those flow levels, NA 1.8 and NB 1.8. With the stock 99 intake mani the car hit a wall powerwise by 6k. With the gutted mani it kept climbing to redline.

Below are the 2 intakes in question. We swapped it at the dyno and ran the car again after retuning on the street.
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Hit the dyno again....-dynoday_11-15-08-52.jpg   Hit the dyno again....-dynoday_11-15-08-53.jpg  
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Old 11-18-2008, 09:17 PM   #11
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Wow, that is awesome..
Now I am tempted.
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Old 11-19-2008, 09:05 AM   #12
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Wow those pictures are pretty crazy haha. I was hoping you'd take them.

I don't even wanna know how long that took Paul to hack apart.

I worked on it for an hour and all I did was weld some holes closed and remove the last bit of internal EGR passage that Paul couldn't reach with his die grinder.
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Old 11-20-2008, 09:32 AM   #13
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Paul exactly how did you gut that manifold. I've been looking for manifold options for some time and the old R4 seems to be the only thing available. Thats a very interesting idea you have there.
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Old 11-20-2008, 09:38 AM   #14
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Quote:
Originally Posted by JayMX5 View Post
Here's a copy of the dyno chart. The [email protected] says [email protected] on this chart and on my older one it was [email protected] What does this mean and what should it have been at?

That's for sure the issue; different loads and rates of acceleration will produce different numbers. I would try to contact Dyno Dynamics and ask them, but it seems the rolling resistance value on each was different, therefore the final output was altered...my uneducated guess would estimate the final numbers should have been closer to 310HP.
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Old 11-20-2008, 10:10 AM   #15
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what were the affects on low-end torque and spool-up with the gutted plenum? I'm considering the same with mine becuase I don't really want to **** with VICS.
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Old 11-20-2008, 10:31 AM   #16
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Quote:
Originally Posted by hustler View Post
what were the affects on low-end torque and spool-up with the gutted plenum? I'm considering the same with mine becuase I don't really want to **** with VICS.
Still waiting for the fatass from ACA to send us the files. Paul is calling again today. Once we get that I guess ill start a new thread as to not hijack this one anymore. But in summary, my car feels awesome.
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Old 11-20-2008, 11:18 AM   #17
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Quote:
Originally Posted by hustler View Post
what were the affects on low-end torque and spool-up with the gutted plenum? I'm considering the same with mine becuase I don't really want to **** with VICS.
how hard is it to trigger a switch at 5200 rpm?

i mean... how hard is it to build a turbo car first?
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Old 11-20-2008, 12:12 PM   #18
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Quote:
Originally Posted by y8s View Post
how hard is it to trigger a switch at 5200 rpm?

i mean... how hard is it to build a turbo car first?
I thought I had to build some gay ******* circuit ****? If its just hooking up the shift-light, then I'll keep it. My **** would be together if I weren't the glue which held the virtue of the nation together.
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Old 11-20-2008, 05:11 PM   #19
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Quote:
Originally Posted by stubbs View Post
Paul exactly how did you gut that manifold. I've been looking for manifold options for some time and the old R4 seems to be the only thing available. Thats a very interesting idea you have there.

cut off wheel. die grinder, and many hours. also had to have some holes filled after removing the shaft for the vics butterfiles and egr.
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Old 11-20-2008, 06:46 PM   #20
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wow op, your car is CLEAN!!! very nice, and with the dyno altered, its useless to compare one run to another. strong car nevertheless

and that mani, oh my , that looks NICEE
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