soviet

iTrader: (10)

1 gallon of E85 has at least 0.7 gal ethanol and 0.3 gal gas
11 gallons of 93 aka E10 has 1.1 gal ethanol and 9.9 gal gas

so 11 gal 93 and 1 gal e85 you end up with 1.8gal ethanol in 12gal of fuel -> which is same as 15% ethanol, meaing you just mixed up some E15.

Mazdaspeeder

Thanks for the explanation. What would that do with an unchanged tune? What would it do to AFR etc?

18psi

iTrader: (76)

It won't do much good in terms of more power and less det, but may lean your car out dramatically. Mixing without tuning or a flex sensor is a really good way to ruin your engine. Don't do it. I've seen too many people break stuff doing that. Pure e85 is pure win, however.

On the other hand, your fuel lines will be fine, and the 775's should be able to handle 300-350whp on e85. Might need a afpr though.

Don't stop posting videos. Ever

Mazdaspeeder

I will just stick with 93* for now and do the appropriate mods later if I decide to do flex fuel.

FAB

iTrader: (4)

Wise move. Mixing fuel is right there with Water/Meth in my book. It's a band-aid for fueling with too many potential failure points. Flex fuel sensor is a good way to combat this but you obviously need to invest some serious dyno time to get this dialed in safely, especially when MBT tuning.

Car is looking beastly man - Might have to make a trip down next summer to check you out. You've been a pleasure to deal with.

Mazdaspeeder

If you're in Philadelphia, definitely give me a shout and we can meet up. Miata Man Date?

Mazdaspeeder

I did some playing online and figured out that my car right now generates ~292hp/ton. To put it in perspective. (This is converting 311whp to 365bhp via some calculator)

Mercedes C Class 63 AMG Coupe Black Series - [2011]298.2 bhp per tonne
Mercedes E Class 63 AMG - [2013]298.1 bhp per tonne
Lamborghini Miura P4000 SV - [1971]297.7 bhp per tonne
Porsche 911 Turbo 997 - [2006]297.7 bhp per tonne
Porsche 911 GT3 RS 997 - [2006]297.4 bhp per tonne
Porsche 911 GT3 997 - [2007]296.7 bhp per tonne
Porsche 911 Turbo S 993 - [1998]296.0 bhp per tonne
Morgan Aero 8 4.4 V8 - [2000]294.5 bhp per tonne
Dodge Viper GTS - [1996]293.9 bhp per tonne
Ferrari 575 M Fiorano - [2002]293.6 bhp per tonne
Jaguar F Type 5.0L V8 S Cabriolet - [2012]293.0 bhp per tonne
Mazdaspeed Miata "Honey Badger" [2004]292 bhp per tonne
BMW 5 Series M5 Competition Pack F10 - [2013]291.5 bhp per tonne
Chevrolet Corvette 6.2 V8 2d - [2007]291.4 bhp per tonne
BMW Alpina B5 V8 Switchtronic E60 - [2006]290.6 bhp per tonne
Chevrolet Corvette C2 Stingray 427 425hp - [1966]290.4 bhp per tonne
Aston-Martin Vantage V12 Roadster - [2012]289.7 bhp per tonne
Ferrari 612 Scaglietti F1 - [2004]289.6 bhp per tonne
Wiesmann GT MF4 - [2008]289.6 bhp per tonne
Jaguar D Type 3.4L - [1954]289.3 bhp per tonne
TVR T350 T 3.6 - [2004]289.0 bhp per tonne
Mercedes C Class 63 AMG Edition 507 - [2013]289.0 bhp per tonne
Mercedes C Class 63 AMG Edition 507 Coupe - [2013]289.0 bhp per tonne
Caterham 7 Superlight - [1996]288.7 bhp per tonne
Lotus 340 R - [2000]288.7 bhp per tonne
Ferrari 360 Modena F1 - [1999]287.7 bhp per tonne
Mitsubishi Lancer Evo VIII MR FQ 400 - [2004]287.2 bhp per tonne
Mercedes SL Class 63 AMG V8 - [2012]287.2 bhp per tonne
Ginetta G60 3.7 V6 - [2011]287.0 bhp per tonne
Jaguar XK R 5.0 Supercharged - [2009]286.9 bhp per tonne
BMW 6 Series M6 4.4 V8 F13 - [2012]286.7 bhp per tonne
Jaguar XF R-S 5.0 V8 - [2012]286.6 bhp per tonne
Aston-Martin Vantage V8 550 - [1993]286.4 bhp per tonne
Mercedes CLS Class 63 AMG 4Matic - [2013]286.3 bhp per tonne
Mercedes SL Class 65 AMG V12 R230 - [2004]286.2 bhp per tonne
Audi R8 6.0 Quattro V12 TDI - [2009]285.7 bhp per tonne
Cadillac CTS -V 6.2 V8 Auto - [2009]285.7 bhp per tonne
Ferrari 500 Superfast 5.0 V12 - [1964]285.7 bhp per tonne
Aston-Martin DB9 5.9 V12 - [2012]285.7 bhp per tonne
Mercedes SL Class 65 AMG V12 R230 - [2008]284.9 bhp per tonne
Audi R8 5.2 V10 Spyder - [2012]284.6 bhp per tonne
Mercedes CLK 63 AMG Black Series - [2007]284.0 bhp per tonne
Alfa-Romeo 8C Competitzione - [2008]283.9 bhp per tonne
Mercedes CL Class 65 AMG Bi Turbo - [2003]283.9 bhp per tonne
BMW 5 Series M5 F10 - [2011]283.8 bhp per tonne
BMW 6 Series M6 Gran Coupe 4.4 V8 - [2012]283.0 bhp per tonne
Ferrari 550 Maranello - [1997]282.6 bhp per tonne
Audi A6 RS6 5.0 TFSI V10 - [2008]282.4 bhp per tonne
Audi A6 RS6 Avant 5.0 V10 - [2007]282.4 bhp per tonne

Of course without a driver it means nothing, but cool to see where my money has gotten me vs the costs of other cars and their respective performance on paper. After consulting professor google again, I found most of the cars in this power range run a low 12 or high 11 second quarter mile. I'm happy with that, and will try for 11s at Atco next year!

18psi

iTrader: (76)

Our cars were not designed with the quarter mile in mind, and it takes quite a bit of skill and prep to get good quarter mile times. Just a heads up, so you're not too disappointed later. Most of my friends with 360+ to the wheels still struggle to hit 11's because they're simply spinning halfway down the track. Heck, Ryan spun wrinkle wall slicks down the track to a 12.6 @ 122

But I wish you the best of luck, and hope you do hit 11's, and make sure to take videos please

Mazdaspeeder

LOL traction is definitely a problem. Once I get the EBC set up and get my boost by gear done, maybe more doable. Atco also IIRC happens to be the lowest elevation track in the country.

Mazdaspeeder

So I got a Skunk 2 throttle body for it. Need to port the IM a little to get rid of the ridge from going bigger. Not expecting power gains, but my mechanic said he's going to re-do some of my IC pipes and he thinks I can gain power from that.

Need to see Ken for Boost by Gear anyway, maybe we'll just book an hour or two on the dyno to do that, the knock sensor, and small corrections. It's been cold here, and calling for 12-16" of snow today and tomorrow. I've put <50mi on the car in the last 3 months, but I'm trying to save miles for summer. Should probably go start it in the garage at least for a minute or so soon.

18psi

iTrader: (76)

have you considered a squaretop? or a honda mani? or something along those lines?

I highly doubt re-doing the ic piping on your setup is going to net any gains, and yet the vtcs manifold is terrible and should definitely be up for replacement consideration.

or if you want a spare I'll sell you one cheap and you can hog it out as hard as you want. I've always wanted to see someone go nuts with a grinder on one of those, and actually will attempt it myself someday when I have spare time

Mazdaspeeder

I'd probably get a squaretop (hope the Skunk 2 TB can bolt to it). I can't imagine it being very easy to get into all the passages of the VTCS to port it correctly. Were you thinking of grinding out the webbing inside and make it one large plenum instead of 4 smaller ones?

18psi

iTrader: (76)

nah, more along the lines of welding up the vtcs shaft passages, smoothing out the runners, smoothing out transitions inside, and REALLY hogging out the TB throat cause i believe that's where the biggest restriction is.

all of the people that hogged out the guts before would usually see 5, maybe 10hp total gain, and even then it wasn't a super precise comparison, so I'm not sure that is the area to waste too much time on.

if the skunk2 is miata specific, then it should bolt to all NB intake mani's

Mazdaspeeder

We've already removed the flappers in the runners, welded the holes, bored and smoothed those passages. The only thing stock still is the TB and TB inlet area. IIRC there's a pretty mean curve there, but I'll see what my guy can do. Plan is to just bring him the TB and top plenum of the IM so the car can stay in the garage at home.

18psi

iTrader: (76)

oh I see, well in that case carry on

I think to get rid of the kink altogether it requires cutting the bottom part and welding in aluminum. I know I've seen someone do this already. seems like a ton of work and money to sink into a vtcs mani, but if your guy is cheap and if you've already gone this far I guess might as well try it.

curly

iTrader: (25)

Hogging out the inside is a sure way to loose power, at least on a VICs manifold.



As far as I've read from Emilio, he seems to be suggesting that a square top with the upper half ported to fit the S2 throttle body is the "easiest" high performance intake. That's if you don't wanna pay for the Honda, cut up a perfectly good mazda, have it welded, and then pay to have the TB opening and welded runners ported.

Lokiel

Easiest solution is to use a ported squaretop - the Skunk2 TB bolts onto it fine.

Minimising the number of plumbing bends and reductions will improve airflow.

Regarding that last bit:

On MSMs, the stock turbo outlet is 1.75" and the TB is 2" (or something close to that). Most MSM guys will install an aftermarket intercooler that has 2.5" barbs and on the coldside use a 2.5" -> 2" hose reducer so that they can use the existing coldside plumbing. This reduction is a bottleneck to airflow so replace all that coldside plumbing with 2.5" pipes and use a 90* 2.5"->2.75" silicon elbow to connect the Skunk2 TB.

It's a good idea to replace the MSM IC pipes anyway since they're steel and prone to rusting on the inside.

Mobius

iTrader: (2)

Squaretop:





Ported intake (you can see some gasket, I re-assembled to take this picture, gasket won't be in the way on final re-assembly)



What you have if you don't port the intake, you are definitely flowing enough air for this to be a noticeable obstruction:

Chilicharger665

iTrader: (2)

My old squaretop looks so good! I wish I wouldn't have sold it though, lol.

18psi

iTrader: (76)

You mean my old squaretop? or is that a different one?