high HP Nat Asp

[Babalouie]

A dyno will always have the hp and torque crossing at 5250 RPM. Any change and it has being screwed with.

Not sure if (as you are a Canadian "import") you have heard of Pauline Hanson, however in her best nasal voice... "Please explain??"

AFAIK (big disclaimer!) all dynos have a variable setting, called the ramp-rate. It is a calculation variable that factors-in the drivetrain inertia and friction.

What the dyno really records is the torque/tractive effort at each rpm, and the ramp rate will covert this value at each rpm into power/hp. Power is the rate of change of torque (or something like that) so the ramp rate is a factor in coming up with the final hp figure.

So by fiddling the ramp rate, you can directly fiddle the hp figure. But if you did that, the relationship between power and torque in the dyno calculation will have changed, and this will be evident in the crossover point between power and torque changing from before to after dyno charts.

...I am not so sure why it should be at 5250rpm tho, but if the crossover point changed then it's been fiddled.

[The Pupat]

It's possible, yet challenging to get a microtech passed emissions/RTA.

Supposedly quite possible. If you can tune in matrix mode which most can't. But it'll be cheaper for you to just put the original ecu I'd say to get it past RTA.

[93_Clubman]

Thanks babs & ct

brian wrote: Reality was he was fudging the dyno to make it look like it was worth the $$ he charged.

hope not, but must concede the possibility...

dubly wrote: A dyno will always have the hp and torque crossing at 5250 RPM. Any change and it has been screwed with.

don't have dyno sheets with me but will check them out with interest soon...

[Babalouie]

dubly wrote: A dyno will always have the hp and torque crossing at 5250 RPM. Any change and it has been screwed with.

don't have dyno sheets with me but will check them out with interest soon...

You might find that the dyno chart just shows the power curve and the air/fuel ratio.

Usually that's all that they show, but in general don't get too caught up with absolute dyno figures, just pick one honest dyno operator that you get along with and stick to him.

Unfortunately my favored dyno operator's dyno is a bit stingy on chucking out the big hp numbers but he is a lot cheaper than the other dyno I have used which does chuck out 8rwkw more

[Okibi]

For turbo / big power cars i'm a huge fan of the DynaPack style hub dynos

[Babalouie]

For turbo / big power cars i'm a huge fan of the DynaPack style hub dynos

Ooh...yeah. If STM wants his COW then we can have a very good bunfight about DynaPack vs Dyno Dynamics hp

[Craig]

For turbo / big power cars i'm a huge fan of the DynaPack style hub dynos

Ooh...yeah. If STM wants his COW then we can have a very good bunfight about DynaPack vs Dyno Dynamics hp

I think maybe STM has contracted Mad COW disease? He's always craving COW!

Here you go Stefan... http://www.mad-cow.org/

[roddclarke]

93_Clubman - you are a lucky man then. Wish I had such luck!

Once again.. i agree..

others & my mods indicate a fairly consistent 20rwkw is achieveable. & i guess it's bonus if you get a high # to start with...

very true damm i wish mine had a few more Kw to start with haha

As with varyations in dynos.. personally i just think Dynos shoud be used for tuning a particualr car on a particular day... getting the best from that car... and not to go bragging about who has the bigger HP figure.. to me.. its the fastest car round the track or down the strip.. and most importaintly.. how much better the car feels to YOU to drive

now to check my dynos for this 5250rpm cross over

[yarnmx5]

OK, I 've spoken to mx5mania about that NB8A engine...I am trying to move stuff around my small garage to fit a engine on a stand. The engine will also come with :

Loom, not sure about ECU, clutch, flywheel etc . They have low (or can get) km NB8A engines for around $1500. I think I'll keep my standard 1.6flywheel/ HD 1.6 clutch setup

Now I need to get a engine stand.

So...new engine, headers/exhaust/intake standard ECU ...85rwkw,
tuning microtech 96rwkw.

then pistons, cams, headwork....100+rwkw

Does this sound about right.?

[CT]

I am still dubious about achieving 20 rwkw without headwork and cams regardless of the ecu tune. Only because I've never seen evidence of it on a non VVT engine. Over 100rwkw NA costs lots of dollars - don't be fooled. Headwork and compression are the areas where hp are found. I think if you took 40-60 thou off the head and just bolted it back on you'd have a chance, but without it I'm doubtful. BTW, this is not a recommendation.

[yarnmx5]

So CT, do you think its worth the extra expense to do the transplant instead of just the 1.6 refreshen. I mean , 10-15rwkw...am I going to drive it first time and think...why didn't i do this earlier..or will I think, bloody hell, $3000 to $5000 for this waste of time.

And before you ask why I want it to do...I want a fast street drive which is impressive on the track at sprint days. I have a target at my local track which I don't know if I can acheive without some serious butchering of the car for weight..or more oomph.

[Babalouie]

So CT, do you think its worth the extra expense to do the transplant instead of just the 1.6 refreshen. I mean , 10-15rwkw...am I going to drive it first time and think...why didn't i do this earlier..or will I think, bloody hell, $3000 to $5000 for this waste of time.

And before you ask why I want it to do...I want a fast street drive which is impressive on the track at sprint days. I have a target at my local track which I don't know if I can acheive without some serious butchering of the car for weight..or more oomph.

IMHO, a full rebuild on your 1600 will cost into the thousands anyway. I rebuilt my 1800 and the costs were:

Head reco 900
Block machining, bottom end assembly, ACL bearings 800
NB8B pistons, OEM gasket set 1100
Water Pump, timing belt & tensioner 500
Labour/sundries 1200

So that's your benchmark if you want to rebuild your 1600 as a base for further mods...my target was as a good, torquey street driver with some decent snort away from the traffic lights and if it shaves a bit of time arund Wakefield, then so be it. At the moment has 90rwkw with mild cams. If you're in Sydney you're welcome to come for a ride

[CT]

The 1.8 swap is pretty common and will be a better option for power. The difference is torque. Bigger capacity increases torque. That said, I know of at least one B6 that's making decent hp - it's just that it would have cost him the same to do a 1.8 and then he'd be getting more HP. I would certainly upgrade to the 1.8 unless you want to turbo the 1.6 - then it's a whole other story.....

[yarnmx5]

No turbo....I used to have a wrx and altough I loved it at the time, my little mx5 is more fun to drive. At sprints, I often have people come up and ask what engine I have in the car and they all get a shock when I tell them the engine is a stock 1.6 with 100hp (at the wheels). They just cant believe a shit-box (the body of my car is pretty bad by my own admission) mx5 "girls" car can keep up and beat many others with more power....but I'm sure you lot know this anyway.

CT I also know of a 1600 with supposedly 175hp (flywheel)...it is out of an old mx5 race car which had an unfortunate incident at Mallala and no longer exists. The engine is just sitting there and I have thought about making an offer, however I'm not sure it would be a "streetable" engine to use daily. I have heard that thousands was spent on the head, throttle bodies and computer, infact I bought my microtech from this guy who upgraded the computer to handle the throttle body intake.

Anyway, I reckon the upgrade is going to happen. I just hope the 1.8 revs as easily and freely like my current 1.6.

[maxwolfie]

No turbo....I used to have a wrx and altough I loved it at the time, my little mx5 is more fun to drive. At sprints, I often have people come up and ask what engine I have in the car and they all get a shock when I tell them the engine is a stock 1.6 with 100hp (at the wheels). They just cant believe a shit-box (the body of my car is pretty bad by my own admission) mx5 "girls" car can keep up and beat many others with more power....but I'm sure you lot know this anyway.

CT I also know of a 1600 with supposedly 175hp (flywheel)...it is out of an old mx5 race car which had an unfortunate incident at Mallala and no longer exists. The engine is just sitting there and I have thought about making an offer, however I'm not sure it would be a "streetable" engine to use daily. I have heard that thousands was spent on the head, throttle bodies and computer, infact I bought my microtech from this guy who upgraded the computer to handle the throttle body intake.

Anyway, I reckon the upgrade is going to happen. I just hope the 1.8 revs as easily and freely like my current 1.6.

Sounds pretty nuts.. I'm looking to do the same thing, however I wont be swapping engines or anything like that, I probably wont even bother with CR's and high comp pistons and whatnot.. it's all too much cash - plus id rather a quick free revving engine as opposed to an engine with more inertia and torque and whatnot - I'm concentrating on cam selection next for the 1.6