Is a 30% increase in power possible with CAI and an Exhaust?

[Novice1]

98rwkw to 118rwkw. i didn't fidle with the boost (or anything else), which is only at about 6 or 7 psi. so there is plenty of wiggle room for more power there, easilly.

Thanks Fatty. That would be one nice NA to drive.
Cheers Novice1 aka Ron

[Tedsmx5]

NA8 140,00k 88.5HP 182FtLb std at the rear wheels, with ceramic coated headers hi flow cat 2.5" system 96.5HP 202FtLb. both runs on the same dyno.
Approx 10% increase. A noticable change and a great sound
No dyno done since SC and ECU (soon).
Ted

[pcmx5]

NA8A (all figures on an Dyno dynamics Dyno)

CAI and XForce extractors and Genie catback 64RWKW;(EDIT That figure was with crook plugs, sorry, the next year it made 66.8RWKW in that set up) )

As above( afew days later and no other differences) but Town and Country Catback 73 RWKW;

As above plus Tighe 805c cams and Microtech piggyback ECU and tune 94RWKW;

Even allowing for the higher power in your car standard his figures seem really high.

Peter

Dyno chart in that section of this forum.

[Charlie Brown]

At a Club Dyno day 2 years ago, standard NB8Bs were putting down 78.5 - 79rwkW.

NB8Bs with exhaust systems and CAI were able to get about another 9 - 10rwkW's.

Thats around 113kW at the flywheel given my NC on the same day had 91.6rwkW and Mazda claim 118kW at the flywheel.

[pcmx5]

At the Vic club dyno days on the Caulfield Jag Dyno Dynamics dyno the 3 standard NB8B's made 70.1,70.3 and 71.6 RWKW respectively,or about 66-67% of quoted flywheel KW.

Amazingly over a 3 year period that Dyno gave consistent figures for every category eg NA8A's 62-63 RWKW stock.

Charlie Brown's figures and these really demonstrate that a dyno is really only good for direct comparison of the effects of modifications when measured on the same dyno and at as near as possible the same conditions.

Whatever,it is hard to see a 30% improvement without something more substantial than CAi and exhaust!

Peter.

[sliq]

Tighe 803c cams and Microtech piggyback ECU and tune 94RWKW

[matt9111]

What kind of cost are we talking when we start playing with ITB's, cams, cam gears, pistons, rods?

[matt9111]

Wow! So turboing the motor will probably yield better results for less money.

I'm thinking about going for the autoexe air intake, (not the one my mechanic reccomended) has anybody got any experience with this intake system?

http://www.streetunit.com/AutoExe_Ram_Air_Intake_Mazda_Miata_99_05_p/mnb959.htm

Cheers

[sliq]

you will be looking close to $900, inclusive of shipping. not worth the cost imo, it's all show.

that intake doesn't really do much because the tuned length of the intake has shortened which will give you less torque from low to midrange, yet because it allows your car to breathe a bit better, it would give ur car maximum 2kw of power.

i know this because i have something very, very similar in mine.. though, the car does breath better and feels a lot more responsive than the k&n typhoon.

i'd shoot mxhevn a PM on his intake.

with the cost of that autoexe intake, you can buy a much cheaper intake PLUS an exhaust.

[pcmx5]

Engine rebuild is 1700, engine swap is 1300, (dont ask how I know) plus the pistons which are another 600 or so, rods are what a grand. So you're nearly at 5G before you buy the ecu (2grand), cams(? a grand?), gears (few hundred), IRTBs (1500??). Plus tuning and exhaust and clutch and flywheel, and engineering if you want to be proper.

To get to 94RWKw on mine,Extractors, cat and full exhaust,approx$1200;CAI $400;cams $1000;Microtech piggyback $1200,fitting cams and tune $800.cam gears =waste of time at my stage of tune so still $4600.all up.

Like lots of these situations you start with CAI and exhaust and then add without really thinking about the total cost and you do bits and pieces as the funds become available;obviously if you know what you want at the end and have the funds available you may proceed differently.

Having said that I find having a really smooth power delivery with instant response at 94kw makes for a nicely balanced car.Supercharging does appeal though!

Peter.

[wun911]

I understand that CAI darws cool air and cool air has more oxygen which helps you burn fuel.

My heat shield, added tubing and pod filter weigh 3.1825 kg more than stock setup. If I have lowered the air temp, in my intake by 10 deg C. How how much more power do I get out of my MX5?

ie How do I calculate if the CAI is worth the added weight and if it has improved my power to weight ratio.

[bruce]

Jay-sus.......Go sit on the can and you will get free power.

[Rotary]

Having said that I find having a really smooth power delivery with instant response at 94kw makes for a nicely balanced car.Supercharging does appeal though!

Your mods are perfect for a Supercharer now. Turbo's don't respond to Cams that well, whereas S/C's lovem, thats the trick to making S/C's as powerful as Turbo's.

By my Calculations the 30kw needed to drive a Hi-boost Hi-Po S/C would be easily offset with Cams, add to that a Lysholm(Screw) type Charger and 300kw(engine) is obtainable. with Zero Lag.
Even a lower Boost, Eaton S/C should get you around 200Kw(engine) with the mods you allready have

What are the Cam Specs on the 803c's I looked up their Website and could only find data for 805c's in a choice of turbo or non turbo Spec.
Cheers, Matt.

[pcmx5]

Hi Matt,
Sorry that was a typo,mine are 805"s.

Probably not really interested in chasing anymore power now but if I was starting again i would probably go to a supercharger .I love the free revving nature of the engine but with max(corrected) speeds of 85,120,160 in 2nd ,3rd and 4th with two still to come and the fact that it IS only a road car it really is all I need!!!

Really interested in your comments re the mods and supercharging,thanks.

Now if I were to put off retirement for a few months later than I plan may be a supercharger..............

Peter

[Matty]

I understand that CAI darws cool air and cool air has more oxygen which helps you burn fuel.

My heat shield, added tubing and pod filter weigh 3.1825 kg more than stock setup. If I have lowered the air temp, in my intake by 10 deg C. How how much more power do I get out of my MX5?

ie How do I calculate if the CAI is worth the added weight and if it has improved my power to weight ratio.

Colder air is denser, and therefore heavier. So it will make you slower.