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

[Rotary]

Nice gearing change with the 6speed there Peter, giving torque improvements over the 5speed of

1st-19.32%
2nd-19.96%
3rd-23.74%
4th-25.77%

and thats added to your substantial torque gain from engine mods. Giving it a very punchy feel in each gear, not unlike the thrust of a supercharger. Would have loved to see it if I were closer to Vic (im in Syd)
The main drawback with the gearing being, that each gear revs out early and requires changing to a less torquey Gear (soln: Raise the rev limmit)

By the Speed values i'm guessing you havn't raised it, and if you havn't considered it yet or dismissed the idea
then there are massive gains to be had with your mods

Does the Piggyback microtech allow a RPM limmit raise? if not have you heard of the Crystal Mod (i've raised it in mine this way)

Agree though, that the S/C and gearing may be too torquey for 1st and 2nd on the street. but if you track it, then torque is always welcome

Also with your Drag time, what was the 60ft time and approx air - track temps (summer or winter)
I'm guessing you can substantially improve on that time with that power output(unless carrying lots of extra weight)
Cheers Matt.

[AJ]

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.

love your work Matty

[Boags]

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

love your work Matty

X 2

[Fatty]

My NC picked up about 30% more power with a full exhuast system (less one cat) and a cai.

With a cat back and cai 15% is definately possible.

NC is a different beast to NA / NB. different engine completely.

do you have any dyno results to show this 30% improvement??? "about 30% " sounds a bit wishy washy , give me the cold hard facts!!

[AJ]

My NC picked up about 30% more power with a full exhuast system (less one cat) and a cai.

With a cat back and cai 15% is definately possible.

NC is a different beast to NA / NB. different engine completely.

do you have any dyno results to show this 30% improvement??? "about 30% " sounds a bit wishy washy , give me the cold hard facts!!

I'm of the same mind, I fail to see how you can gain 35.4 Kilowatts from an exhaust & intake, that is a helluva lot of grunt that I'm sure Mazda didn't overlook....but, IF I can see before & after dyno sheets from the SAME Dyno, I will immediately rush out & buy these improvements that will shoot my car from 118 kw ATF to 153.4 kw ATF.....aprox 3.4 kw MORE than a stock SP

[Rotary]

My NC picked up about 30% more power with a full exhuast system (less one cat) and a cai.

With a cat back and cai 15% is definately possible.

NC is a different beast to NA / NB. different engine completely.

do you have any dyno results to show this 30% improvement??? "about 30% " sounds a bit wishy washy , give me the cold hard facts!!

Your own dyno post says from 90kw to 105kw, about a 16% gain
http://mx5cartalk.com/phpBB-3.0.2/viewtopic.php?t=33135
and thats with some sniper tuner

[sliq]

My NC picked up about 30% more power with a full exhuast system (less one cat) and a cai.

With a cat back and cai 15% is definately possible.

are you telling me that the NC is now sitting on 156kw? just from a full exhaust? that's a fair bit to digest...............

[pcmx5]

By the Speed values i'm guessing you havn't raised it, and if you havn't considered it yet or dismissed the idea
then there are massive gains to be had with your mods

Does the Piggyback microtech allow a RPM limmit raise? if not have you heard of the Crystal Mod (i've raised it in mine this way)

Agree though, that the S/C and gearing may be too torquey for 1st and 2nd on the street. but if you track it, then torque is always welcome

Also with your Drag time, what was the 60ft time and approx air - track temps (summer or winter)
I'm guessing you can substantially improve on that time with that power output(unless carrying lots of extra weight)
Cheers Matt.[/quote]


Matt,

I don't have a limiter but use 8000rpm so I guess the piggyback allows that.I haven't tried to go harder but it certainly isn't hitting a limiter.

The 1/4 mile time was with the 5 speed 4.1 combination not the 6 speed 3.9 that I am running now;I may have another gear change with the 6 sp so it would be interesting to see what it did now.

As far as weight is concerned it has a style bar and a heavy driver!

My speeds are with a speedo that is spot on at 100klmph (previously it was showing 105 at a true 100)

I am sure I have the drag time slip at home so will get back to you re that.

Cheers,

Peter

[Rotary]

Definitely some useful revs there, even stock engines seem to make useful power above 7000rpm so with yours it would be necessary.

My car has that problem too with its driver , weight is important and does add up when you look at some cars with a ton of options, but its not a huge factor with only a couple of items.
Based on my cars weight, power and torque. For every 0.1s and about 1kph on drag results, requires around 22kg of weight difference(+-2kg for most 5’s), so its not all that bad.

That would be great if you could post your timeslip and or dyno, be good to see, with all the work done on your engine and results,
Cheers Matt.

[pcmx5]

Dyno is in the dyno section of this forum;will grab the timeslip at lunchtime.

Peter

reaction time 1.0914

60ft 2.3798

330ft 6.5394

660ft 10.0451

1000ft 13.0907

ET 15.6559

22.9 deg cel.

37% humidity

Windspeed 0.0klph

[RG.net]

pcmx5

what is this crystal mod you speak of? i would like my n/a set up to run @ 8000rpm, and the greddy emanage is unable to do this.

for another comparision to turbo vs n/a price i have so far:

tighe custom grinded cams USED $475
mazda miata vition valve seals New $50
supertech 1mm o/s valves Used $300
Supertech spring kit Used $350
Greddy emanage blue New $250
toda power camgears New $320
toda power head gasket New $340
Total $2085

i'm still in need of some parts and this is without touching the bottom end, mind you this is just parts and doesnt include any labour. Also some parts are used, which ends up being cheaper for me, and i am planing a head rebuild so pretty much everything is being changed, most parts wont be needed.

but still $2000 in some parts for n/a? or $3000-4000for a turbo kit? you decide.

[pcmx5]

Actually Rotary was speaking of that, my Microtech allows mine to rev to my delight!!

I thought you could have your cams done to 805 spec for $500 or buy new bullets for $1000 so used at $475 may not be a great bargain;I didn't open the engine/head at all and the 805's are designed to use the standard gear settings so i didn't need cam gears.

My motor had only done 62000klms when I did the cams and Microtech and 20000klms later I am still delighted with it.

Peter

[Steampunk]

I thought you could have your cams done to 805 spec for $500 or buy new bullets for $1000

correct.
But when I spoke to someone at Tighe, they made me feel like I was asking them to clean my toilet for me. "Disinterested" is the word I'm looking for.

$500 for them to build-up standard cams with welds ..... hmmmm.... no thanks.

[RG.net]

Actually Rotary was speaking of that, my Microtech allows mine to rev to my delight!!

I thought you could have your cams done to 805 spec for $500 or buy new bullets for $1000 so used at $475 may not be a great bargain;I didn't open the engine/head at all and the 805's are designed to use the standard gear settings so i didn't need cam gears.

My motor had only done 62000klms when I did the cams and Microtech and 20000klms later I am still delighted with it.

Peter

i had speculation about he cams but i did ring tighe and they do remember making these cams, and they sent me the spec sheet before i purchased them, turns out they are 898c, and that it would cost over $1000 to remake these. this is the main reason why i have upgraded the valves, springs and camgears, and the fact that the parts have 140***kms on them. part of the head will need to be shaved to allow the cams to rotate correctly, so there will be a bit of tinkering to be done, but i am sure it will be worth it.

[pcmx5]

Obviously you have done your homework, wasn't trying to denigrate the SH cams but occasionally people go ahead and buy things for almost new price so was just a heads up.

I will be most interested to hear your outcomes, should be really good because mine is just a mild set up well(I think) tuned

I started off with a lean running standard engine and put a Malpassi fuel reulator on and it made little difference so I was partially trying to correct that issue with the MIcrotechs adjustability ,and then thought if I am going to get a dynotune why not try the Tighe cams which had good reviews.

I think I will fit a new fuel pump and have been toying with replacing the XForce extractors with the set of Racing Beat 4:1's that I have so will have to do that and the pump before a retune.I have a bit of a fear that I might do all that and go backwards in terms of drivability!!!

Good luck with your project please keep posting as you go along.

Peter.