Unichip for Mazda Astina V6

[fate_n_destiny]

Hi everyone.

A friend has recommended I get a unichip installed into my 1995 Mazda Astina V6. Has anyone had one fitted recently? Any remarks? How much would it cost approximately for this?

[Rupewrecht]

there's a few posts on the subject of chips in here :)

http://astinagt.com/forum/viewtopic.php?t=1084
http://astinagt.com/forum/viewtopic.php?t=1136
http://astinagt.com/forum/viewtopic.php?t=842

it's all specific to the AStina SP20, but it applies to any engine really :)

cheers
Dan

[KittyKatSmack]

Hey Dan,

I would have thought the unichip would be something to do a bit later down the track...
Sort of build up the rest of the car first so that it is in a condition to deal with the increased power gain?
Does that make sense?
*tries again*
If you are going to push more horsies through the motor without strengthening the rest of the driving/moving parts, then aren't you going to bust something?
I suppose I am not making much sense, but I would have figured that helping the engine breathe and stuff would help before dumping more power thru it.
I just have visions of more power in engine, dumping clutch, revving motor and hearing ping, snap, and there you have it.....

THE ASTINA CURSE!!!!!!!

*runs away coz she has prolly just made an idiot of herself, again*

:wink:

Hey, I never claimed to actually know what I am on about... Heck, I hardly know what planet I am on most of the time... LOL

[Rupewrecht]

All good points yo've raised :)

As a unichip isnt doubling the existing power, it's not really necessary to go upgrading stuff. Maybe to a heavy duty clutch, as mazda clutches are nothing special to begin with.

but you'll definitely see more benefit from a chip if you've:
*upgraded your exhaust to something better flowing
*installed a better breathing air filter

otherwise you have to get the chip reprogrammed to suit each mod pretty much, which is just a waste of money really!

[KittyKatSmack]

*whew*

So I sorta made sense, at least to myself....

By doing some of the 'prep' work first, you save yourself having to go back and fiddle with what you have already done? chip wise that is (why do I have such a temptation to go down the chip n dale joke road?)

Last question *choke, as if!*
If you had the unichip, would increasing the wheel size mean reprogramming the chip as well?

And what about this stuff about wheel size throwing out your speedo and tripmeters and stuff? I wouldn't have thought it would be by enough to warrant recalibrating the speedo would it??

OK, it was two questions.

Spank me now or spank me later? :twisted:

[Rupewrecht]

*whew*

So I sorta made sense, at least to myself....

By doing some of the 'prep' work first, you save yourself having to go back and fiddle with what you have already done? chip wise that is (why do I have such a temptation to go down the chip n dale joke road?)

yes! but small mods like a filter are small enough for the chip to be able to self-adapt, but a bigger change might need reprogramming

Last question *choke, as if!*
If you had the unichip, would increasing the wheel size mean reprogramming the chip as well?

And what about this stuff about wheel size throwing out your speedo and tripmeters and stuff? I wouldn't have thought it would be by enough to warrant recalibrating the speedo would it??

that's only if you go for an incorrect wheel and tyre combo. as long as you keep somethign similar to the total size of your original wheels, it's ok. IE 205/40/17s on 17" rims would be roughly correct whereas 205/65/17s would be a lot larger and throw your speedo out. the '65' being sidewall height

thus endeth the lesson :p

*dan gets out his paddle* :P

[Trav]

just to clarify: 205/45/16

205 = tyre width in mm
45 = tyre wall height as percentage of with (ie in this case height is 45% of 205)

16 - rim diamerter in inches

205/45/16 is the closest you'll get to stock for 16" rims....

try here for a calculator http://miata.net/garage/tirecalc.html

[KittyKatSmack]

Thanks fella's.

Sorta getting the hang of it now....

mmmmm paddle.....





oops, sorry, have been told I am not to post my crap in any other thread than discussion from now on......
When I asked "says who"
response was "everyone says so"

I don't know anyone with the nic "everyone".....

So... sorry if I have bored ya's all.....

And thanks to the AstinaGT member who kindly brought this to my attention.

:P

[Mr MX6]

The reason we run 17 & 18 etc is so we can run low profiles (hence less side wall distortion = more rubber on the road).

The overall diameter of the wheel tyre combo on 225/40 R17 is much bigger (less power to the road) than the 225/40 R16. So any comparison between these isn't really the way you should be looking at it, as the rolling diameter is very different.

To figure out what will work and what will not, lets look at this calculation:

215/60ZR15 Lets say that this is your stock tire measurement. To find out what size diameter your tire is you need to:
1. Take 215 and multiply it by .60 (60 series tires) This would give you 215x.60=129.
2. Take that number and double it. This would give 129+129=258.
3. Now take that number and divide it by 25.4. That would give you 258/25.4=10.15 inches. That is the height of your sidewall of the tire.
4. Next, add your wheel size (15, 16, 17, 18....) to the number you just got. That would give us 10.15+15= 25.15 inches

Great you say, 25.15 inches, I can just about do anything with that number can't I?
How will this benefit me?
Multiply it by 2*Pi (2*3.1412) and you just found out how to measure how long it takes your wheel to make one revolution.

Now as any future calculations will also need to be multiplied by 2*Pi, we can call 2*Pi a constant that never changes and doesn't require to be included.

Now, if you want to figure out what will happen if you put on a larger size wheel and some lower profile tires you can plug in your wheel/tire combination and see what will be the outcome.

For example, lets say that you go up to a 235/45ZR17.
To figure out what would happen to your speedometer reading you would plug it into the same calculation.
235x.45= 105.75+105.75= 211/25.4= 8.30+17= 25.30 inches

Now that number went up to 25.30 inches, that means that it takes 25.30 inches (*2Pi) to make one revolution instead of 25.15 inches (*2Pi) with your stock wheels and tires.

This means that with the larger wheel and tire package that you have outfitted your MX6 with now makes your speedometer and odometer read a little slower than it is going in all actuallity.

You gasp and say to yourself,"If my speedometer and odometer are going to read slower than it is actually showing, isn't that bad?" Not really because the difference between your stock tire diameter and your modified tire diameter is a very small fraction= less than 1/10 an inch.

This little amount of difference won't make a significant amount of impact on your speed and odometer readings to be overly concerned about, but you should know that it does make a minor difference.

Some other tire/wheel calculations that I have done are:

225/60ZR15= 225x.60= 135+135= 270/25.4= 10.62+15= 25.62
235/60ZR15= 235x.60= 141+141= 282/25.4= 11.10+15= 26.10
205/50ZR16= 205x.50= 102.5+102.5= 205/25.4= 8.07+16= 24.07
225/45ZR16= 225x.45= 101.25+101.25= 202.5/25.4= 7.97+16= 23.97
225/50ZR16= 225x.50= 112.5+112.5= 225/25.4= 8.85+16= 24.85
225/55ZR16= 225x.55= 123.75+123.75= 247.5/25.4= 9.74+16= 25.74
235/50ZR16= 235x.50= 117.5+117.5= 235/25.4= 9.25+16= 25.25
245/45ZR16= 245x.45= 110.25+110.25= 220.5/25.4= 8.68+16= 24.68
245/50ZR16= 245x.50= 122.5+112.5= 245/25.4= 9.64+16= 25.64
215/40ZR17= 215x.40= 86+86= 172/25.4= 6.77+17= 23.77
215/50ZR17= 215x.50= 107.5+107.5= 215/25.4= 8.46+17= 25.46
235/40ZR17= 235x.40= 94+94= 188/25.4= 7.40+17= 24.40
235/45ZR17= 235x.45= 105.75+105.75= 211.5/25.4= 8.32+17= 25.32
245/40ZR17= 245x.40= 98+98= 196/25.4= 7.71+17= 24.71
245/45ZR17= 245x.45= 110.25+110.25= 220.5/25.4= 8.68+17= 25.68
245/50ZR17= 245x.50= 122.5+122.5= 245/25.4= 9.64+17= 26.64
215/40ZR18= 215x.40= 86+86= 172/25.4= 6.77+18= 24.77
225/40ZR18= 225x.40= 90+90= 180/25.4= 7.08+18= 25.08
225/45ZR18= 225x.45= 101.25+101.25= 202.5/25.4= 7.97+18= 25.97
235/35ZR18= 235x.35= 82.25+82.25= 164.5/25.4= 6.47+18= 24.47
235/40ZR18= 235x.40= 94+94= 188/25.4= 7.40+18= 25.40
235/45ZR18= 235x.45= 105.75+105.75= 211.5/25.4= 8.32+18= 26.32
235/50ZR18= 235x.50= 117.5+117.5= 235/25.4= 9.25+18= 27.25
245/40ZR18= 245x.40= 98+98= 196/25.4= 7.71+18= 25.71
245/45ZR18= 245x.45= 110.25+110.25= 220.5/25.4= 8.68+18= 26.68

have a look ere http://www.miata.net/garage/tirecalc.html

[RUKEEN]

i had my Nissan EXA unichip and to tell you the truth it didnt do much!
if i was u bro i would spend my money on sum of the other things the guys have mentioned

MR mx6 has some good info you shuold look into that.