mx5cartalk.com

hey all!
im pretty new to the whole mx5 game so go easy on me if im making no sense

anyway i purchased a pretty neat 89 model na with quite a few bells and whistles a few months ago for a fun weekend car and also some track work. so far i have only entered it into the victorian round of the ATC (australian tarmac challenge....formerly dutton rally). it was a ripper of a weeked and the car performed faultlessly the whole time!!.. but i want some more power now (who dosen't?!)
at the moment it has..
-rebuilt engine with wiseco pistons,new rods ACL race bearings, new crank, reco head.
-AVO stage 2 turbo kit
-miata link ecu

anyway i want to do some work to it and want to know a few things before i get started.
so...
how much will the standard AVO exhaust manifold flow? i was going to make a custom one but it looks like an ok piece of gear and have read they flow pretty well?? the only problem i have with it (if it is good enough to stay)is clearance for a decent 3inc dump pipe. even if i cut away the fire wall lip will there be enough room.
also i am going to weld the internal gate and go external (38mm enough?). how would the cast manifold go with this mod? where would it go? or with both of these things i want to do would it be best to build a custom manifold?

another thing is the ecu.
what are the miata links like as an ecu? where can my tuner get the software for it?

oh last one.. injectors..apparently some wrx ones fit? 420cc ..ish? i cold only find the info in the injector chart floationg around but no one had fit them. wouldn't they be quite a good match and cheap and easy to find?

thanks in advance

cheers
kris

Heya,

Injector chart can be found here http://miataturbo.wikidot.com/fuel-injectors
I just sourced myself some 550cc pnp rx7 injectors via ausrotary forum, worth a look if u decide on the rx injectors.

Ive been told the avo mani is good for over 300hp...

thanks for that.
i swear there is another one with a few others and also the WRX ones i mentioned somewhere?

i initialy thought of the rx7 ones but apparenty the spray pattern ins't too flash. (i also mentioned them to my tuner and he said from previous test they were a crappy spray pattern for anything other than a rotor..)
rx8 ones are meant to be good but are imposible to find and would probably be expensive.

good news on the manifold there. anyone used one with a 3inch dump?

get yourself some denso, or sard injectors.

also be careful when looking at the rating on the injectors, they are not all rated to a standard fuel pressure. increase in fuel pressure can sometimes be the difference between 550cc and 650cc.

ideally the mazda sp log manifold and dump pipe are the best option but the AVO is more than ample.

interesting to see you want to go with an ext. gate, i havent actually seen one on a 5 yet it will be interesting to see how it goes if you do it.

hope i goes well.

You can stick with the Miata link ECU, or you maybe able upgrade the chip with a new one from Flyin' Miata if you have the full replacement ECU rather than a piggy back. You get more robust code, and some extra features.

I just had a look at the Flyin' Miata website and they don't list the upgrade any more, but it may be worth contacting them

www.flyinmiata.com

Or you could go the megasquit plug and play ECU. or AEM, or... lots of choice, depends on the level of experience your tuner has with them.

J

buz 138 wrote:thanks for that.
i swear there is another one with a few others and also the WRX ones i mentioned somewhere?

I've never heard about WRX injectors in a 5' and from what I've been told on the RX injectors, they have a different spray pattern to 'regular' injectors, so my tuner told me to avoid them.

Anyway, here are other plug and play injectors. (props to Blackster for the page)

Its interesting that the list 16Bit has included in this post:

http://mx5cartalk.com/forum/viewtopic.php?f=29&t=37459

includes some WRX injector sources that arent included in the list that d-mag has (and is the list that ive seen in previous research).

Complete list of Miata plug and play replacement injectors (“F” connector):

[HTML]Year Make/Model Engine Size/Color Part #
87-88 Toyota MR2 4AGE NA 213cc – Beige Top #23250-16080
89-91 B2220 Truck 224cc - Yellow Top? #23250-74040?
99-00 Mazda Miata 240cc - Thin Red Body #195500-4430
Toyota 4AGE 250cc – Green Top
Toyota 4AGE 250cc – Violet Top
94-97 Mazda Miata 254cc - Tan Top #195500-2180
01-05 Mazda Miata NA & TURBO 265cc - Thin Lt. Prple #195500-4060
Toyota 3SGE 295cc – Green Top
89-92 Toyota Supra 7MGE NA 305cc – Light Green Top #23250-70080
93-95 Toyota Supra 3.0L 312cc - Maroon Top #23250-46030
Toyota 3SGE 315cc – Pink Top
90-92 MX6/626/Probe Turbo 326cc - Gray Top #195500-2150
89-91 B2600 Truck 326cc - Gray Top #195500-2150
Mazda 323 GTX TURBO 360cc - Black Top #195500-2130
Celica/MR2 3SGE NA 370cc - Green Top #23250-74160
Mazda RX8 420cc - Yellow Body #195500-4450
Subaru WRX 425cc - Lt. Blue Body #3920
89-92 Toyota Supra 7MGE TURBO 430cc – Black Top
89-92 Mazda RX-7 NA 440cc - Blue Top #195500-5740
89-91 RX-7 NA 460cc - Red Top #195500-2010
Subaru STi 540cc - Thin Pink Body #3910
89-91 RX-7 TURBO 550cc - purple top #195500-2020

yeah thats the one!! cheers!
i just had a quick look under the hood (first time for ages!) and there is no where near enough room for a decent dump with the avo so when i buy a mig welder i'll be making my own manifold.
the only problem i can see is i will have to keep the turbo on the same angle to keep the oil return at the bottom. its not really a problem but would have been nice to mount it high or low rater than on its side (if that makes sense?!?!)

any good threads/pics on exhaust manifolds around?

thanks so far!

Hi buz 138,
Welcome to the forum!

Just a thought here but exactly how much rear wheel horsepower do want? The reason I ask is that many of us have had a lot of success with cast manifolds and internally gated turbochargers. So the question has to be asked along with what baseline rear wheel power figure do you have now?

On an average, anyone running a B6 (I presume you are running a 1.6 B6) with a AVO cast manifold on 15 psi/1 bar of boost should be averaging around 230-240 rwhp/170rwkw-180rwkw on a Dyno Dynamics Dynamometer. This is taking into consideration all fuel systems, ECU, exhaust, etc, have been done.

Some of us have got over 300rwhp/230 rwkw pushing boost up some more.

So are looking for astronomically high horsepower (i.e. 350rwhp/260rwkw) out of the B6?

Les @ MX5 Shop
P.S. I have a 2.5" exhaust and the old girl put out a little over 300 rwhp.

mx52nv wrote:So are looking for astronomically high horsepower (i.e. 350rwhp/260rwkw) out of the B6?

you have got 260kw at the wheels in a 1.6???? is this with standard intake mani??? what turbo are you using?

little decks wrote:

mx52nv wrote:So are looking for astronomically high horsepower (i.e. 350rwhp/260rwkw) out of the B6?

you have got 260kw at the wheels in a 1.6???? is this with standard intake mani??? what turbo are you using?

I think you read my post incorrectly.
Here are the answers to your questions respectively.
No. The old girl put out 229rwkw/307 rwhp at 20 psi.
Yes.
HKS GT2535.

little decks wrote:Interesting to see you want to go with an ext. gate, I have not actually seen one on a 5 yet. It will be interesting to see how it goes if you do it.

Brett aka BOYRCR and Terry aka spikey both run external gates. Both done in Perth though.

Okay back to the OP's topic.
Les

Terry's car
http://www.mx5club.com.au/Video/Dyno_June_06/Terry_Lim.wmv

yeah iv'e heard they are quite a good manifold. thanks for some real world figures to go with it!
atm it has 140rwhp at 7psi ...so im looking for 200+

the reason for external gate is better/accurate control, if im doing a custom mani i might as well put one in and the most obvious....an mx5 with a screamer pipe

so the main reason now is room for a decent size dump....any pics?

cheers

mx52nv wrote:I think you read my post incorrectly.
Here are the answers to your questions respectively.
No. The old girl put out 229rwkw/307 rwhp at 20 psi.
Yes.
HKS GT2535.

ahh yes sorry. i just re read it and i see my mistake