|
Originally Posted by patsmx5
(Post 1295711)
You and others said before, there was something wrong with my setup. I've found a few things since then and made it a lot better with yours and others advice. You and I both know that a header and cams would both drop the boost, and up the power. You personally know how much that helps because you've done it.
I 100% plan to build a new header this winter. I've talked to Kelford and they won't make a VVT cam for me, only a 99-00 cam for the intake. They also said they were out of blanks until sometime in early 2016. I need to keep looking I suppose and find someone who will make cams that will work on my VVT head. I can't say if it would make more power at 24 PSI vs 28, but I know that with the two pulleys I have, one gives me 22 PSI @ 8,200, one gives me 28 PSI @ 7,000. Car traps lower ET and higher MPH with the 28 PSI pulley. I also agree that a pro tuner could tune the car and make more power. Probably a lot more to be honest. You built your car to race competitively and win on a national level. You need the best tuner, the best engine builder, the best wheels and tires, the best everything to win on that level. I'm building a car to learn how to build a fast and reliable car myself. I'd rather pay more and go to some classes and learn how to tune it vs pay someone to do it every time I need it tuned. I'm perfectly ok with my car being slower than the fastest race cars, it's to be expected. I want mine to be daily driver reliable and that means it can't be 100% race car too. Aidian, I'm going to do the air pressure in the bumper test, and then try to install another pipe that's routed somewhere away from the front tire and test it with no air filter as you say. Just to get a baseline no-filter test as you say. Still I'm worried but hopefully I can get the pipe somewhere away from the tire enough to test it safely. I too would like to see the difference that makes. I seriously think you could buy those cams and a good header and pick up close to 75hp without changing anything else but the tune. |
2 Attachment(s)
And as I've told you with your header. Anything less than 1 7/8" primaries is too small and get the length of your primaries as close to 16" as you can get them into a 4:1 full merge collector.
https://www.miataturbo.net/attachmen...ine=1451529234 https://www.miataturbo.net/attachmen...ine=1451529234 That will give you some ideas.....and no. I won't post full pictures of the collector :) |
Whatevvs... RB header will still remain as king vs your w/e header :likecat:
ya know, unless you wanna show us :hatecat: |
Originally Posted by patsmx5
(Post 1295628)
Then minus 100-130whp for the SC drag and that would be 350-380whp. Sounds about right to me.
But what does that have to do with my air filter testing? I do appreciate the people here that posted good info regarding things to test or how to calculate what air filters work. But all the back and fourth that has nothing to do with this is pretty useless. You are a way smarter guy than this, just stop and consider how much power at the wheels you could possibly make with your fuel system if you were turbo, then realise its less than Vlads subaru example. Dann |
2 Attachment(s)
Originally Posted by aidandj
(Post 1295692)
Also, every single test is moot until you somehow get a baseline without a filter. The pipe opening alone could be causing 20kpa of vacuum.
So I did. And you are right! But I did not measure the pressure in the bumper cover yet, will do that later today. No air filter: https://www.miataturbo.net/attachmen...ine=1451576165 https://www.miataturbo.net/attachmen...ine=1451576165 Worth noting, despite the air pressure in the intake pipe staying "the same" it seems there is more air going in the motor. AFRs went to 12.9, duty cycle to 103.7% :party: Now what? That's a solid 15% loss in airflow at redline. And it spun 2nd a bit around 5,800 (can see it in log). That was a first! EDIT: 11.9, not 12.9, can see numbers in log. |
1 Attachment(s)
|
Why is your duty cycle going up and your AFRs going lean?? ID1000s can make 850hp on a supercharged engine according to RC's calculator, and probably not at a 13:1 afr.
|
Originally Posted by patsmx5
(Post 1295874)
And you are right!
Curly: pat's on e85 so less than that. But still. |
1 Attachment(s)
This was kinda what I was referring to when your chasing 1-2 percentage of potential HP. It lines up with what I've found when comparing filters on a flow bench.
Your Spectre filter beats no filter which is impossible. Testing all filters back to back might give better data for comparison. https://www.miataturbo.net/attachmen...ine=1451580999 EDIT: added a graph for the visual learners https://cimg0.ibsrv.net/gimg/www.mia...896d6ef309.jpg |
Spectre had belmouth intake under the filter. Could that be the difference?
True optimal setup is a velocity stack in the end of an open pipe. |
Originally Posted by aidandj
(Post 1295909)
Spectre had belmouth intake under the filter. Could that be the difference?
True optimal setup is a velocity stack in the end of an open pipe. |
Originally Posted by cyotani
(Post 1295907)
This was kinda what I was referring to when your chasing 1-2 percentage of potential HP. It lines up with what I've found when comparing filters on a flow bench.
Your Spectre filter beats no filter which is impossible. Testing all filters back to back might give better data for comparison. https://www.miataturbo.net/attachmen...ine=1451580999 EDIT: added a graph for the visual learners https://cimg0.ibsrv.net/gimg/www.mia...896d6ef309.jpg All the filters were tested back to back. The no filter test was a few days later though. I think the spectre beating no filter is proof that the inlet shape is affecting the pressure drop. So here's the big question. What is a cheap/easy way to put a belmouth on a 3" pipe so I can test that theory right now? |
Originally Posted by curly
(Post 1295891)
Why is your duty cycle going up and your AFRs going lean?? ID1000s can make 850hp on a supercharged engine according to RC's calculator, and probably not at a 13:1 afr.
|
Originally Posted by patsmx5
(Post 1295926)
So here's the big question. What is a cheap/easy way to put a belmouth on a 3" pipe so I can test that theory right now?
|
I'll print you one from PLA that'll melt and help get you back to atmo in the intake
:giggle: |
|
Most filters beat an open straight cut tube.
But its still.not an issue here. |
I dont know where all this talk of 850hp comes from, but on e85 id1k's are tapped out just past 400 wheel. Let's say 450 would be the absolute max.
And if pat's claims of 100whp loss to the sc are legit, that means his car will run out of juice at 300-350 wheel...or something like taht |
Originally Posted by aidandj
(Post 1293398)
+1, or even just do a pull without the filter.
|
2 Attachment(s)
Well I found a plastic drinking cup I had that's about 3" at the bottom, 3.5" at the top, about 8" long. So I cut the bottom off, cleaned up the edge and taped it onto the pipe and tested that.
It helped. Data below. At 6K, almost 4 kPa better vs an open pipe! Better everywhere vs all the other setups tested. So for sure the entry is a problem. I'm kind of surprised how big a difference a 1/2" transition made. Would be nice to test a 3 to 4" or something bigger just to see what affect that has. https://www.miataturbo.net/attachmen...ine=1451599755 https://www.miataturbo.net/attachmen...ine=1451599755 |
| All times are GMT -4. The time now is 08:56 AM. |
© 2024 MH Sub I, LLC dba Internet Brands