dude on another board with a turbo miata got some disappointing results.
100 hp over stock isnt bad but it should make mroe power as it is dying up top.
the miata motor is stock(1.8L 4 banger) and he has a t3/to4b turbo w/ a .48 exh a/r.


im thinking the .48 is killing his top end.(as it shouldnt die like that at 5500)
or does the problem lie elsewhere?
he tuned it himself ..maybe thats a problem too.
that run was on 13 psi(Spiked to 15..hence the bump at the begining)

his set up is basic.
t3/to4b turbo
jgs log mani
3" turbo back(through a 3" bullet muffler)
using 550 injectors(from an rx-7)
mk3 supra i/c..he says its keeping the charge cool, still.
and the link ecu.
he w/b tuned it himself aswell(yeah i know i said that already)

Any idea as to whats going on, from the looks of that and the backround info ??
thanks!


(the curve is so bumpy)

 

its not the .48ar.. Where do those things normally make peak power? it looks like its running out of cam or something.

 

It looks to be 2 things.

1. The .48a/r is killing up top. I had one and my torque was dying off at the same place. Replaced it for a .82a/r and now hold torque to 9k rpms.

2. tuning. A/F ratios look rich and probably he could work on timing too.

 

cams wouldnt make as much difference here. its the stock cams and lots of miata guys have used them.
i would say they are ok.

im thinking tuning and the .48 a/r,,
anyone else have any idea's?
art,tony,boosted hybrid , direp etc?

power ois 217 whp and like 208 tq.
a/f in boost is 11.7-11.9

 

a/f looks really rich. what was he aiming for? 12.5 under boost is usually good

 

how about his ignition timing??

 

Im not too sure on what is . ive asked and am waiting.
im thinking tuning and the .48 a/r.

 

if he has the link ecu Flying miata will give him a turbo map for it.... that is what my friend uses and it is very reliable and fast. It also has an ignition map. Just look on their website.

philip

 

what kinda spark plugs and whats the gap set too? my friend made 306whp @ 17psi w/ 60-1 miata on pump gas.

 

gap is 0.030 as it ran like **** at .040 (obviously)in terms of what plugs..not sure.
ill ask

 

does he have the software for the link ecu?

 

yes. He must have it, since he "TUNED IT HIMSELF"

 

Might want to IM Turbomiata.

I know for a fact a stock miatas top end sucks.

 

i can tune my friends cell by cell without the software or with the software you can look at all the cells at once! Dont be a dick i am just trying to help and it sounds like you should learn more about what you are trying to ask about. I have experience with link and was trying to make it easy on you and him.

 

How am I being a dick.
honestly . do people NOT look at the "emoticons"???
thats why I winked and stuck out my tongue. has nothing to do with me being a dick. you need to relax!

I know he said he can tune at 500 rpm increments or so. I figured he had the software since he tuned the car.

 

sorry missed the emotions. With link you can buy the datalogger think from Flyin Miata and it is probably the most useful thing for tuning yourself. It will show you the entire map like FAST does. With just the hand set you can only see one cell at a time.

The map that Flying miata uses is probably one of the best for a base map. Might even be better than what he has. The ignition map is THE BEST for the turbo, we gained alot when we switched back to the one that Flyin Miata had.

 

http://www.flyinmiata.com/inde...14103

that is the latest version.

 

he said he was going to datalog.
he thinks the head just cant flow enough air so it dies up top.

 

anyone else?
thanks

 

I'm sooo loved :D

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by SiRkid &raquo;</TD></TR><TR><TD CLASS="quote">he said he was going to datalog.
he thinks the head just cant flow enough air so it dies up top.</TD></TR></TABLE>

The head flows just fine. A stock M1 (M1 = first gen miata) head just made 460wHP up in canada running 19psi and a 100shot. (built bottom end was the only mod) The miatas head is perfectly fine on stock cams. Its flow characteristics get kinda "crappy" (technical term folks!) with above stock lift cams though. STock cams have made 460whp though just recently, so they must be fine for your friend making only 220 or so whp. What kind of IGN timing is he running in the boosted rows? EGT's? What octane gas? I'd imagine its 93 pump if he is making that low of power. Does he have a larger fuel rail? The stock fuel rail with large injectors tends to run the #1 cylinder too rich an dthe #4 too lean, so you end up with having a less than optimal tune and also limiting your self in what kind of IGN values you can run since you can only tune to the weakest cylinder.

Is he running an aftermarket ignition system? If so that is probably sucking alot of HP from his system because the FM link is set up for the stock coils and dwell isnt adjustable on it unless you have access to the source code which only FM and ray ayala have. (why their race car "track dog" makes so much power but the end users have such a hard time doing it) the .48 might be killing it up top compared to what it *could* be with a larger A/R, but there are a good amount of T28 miatas making ALOT more power, so I doubt its the turbo setup.

My first bet would be to look at the IGN Values. Get him to advance timing a couple of degrees which on the dyno and see if that makes any difference up top.

The A/F ratio isnt hurting performance all that much, from 11:1 to 12.5:! there will only be about a 10-15whp difference. A T3/T4 miata should be alot closer to 300whp than 200, especially if its running 13psi.

If you have any other questions PM me to look at this thread because I dont come on H-T too often.

 

TurboMiata

 

Just wanted to add.... THe link uses a knock sensor (duh most ecus can/do) but the link is setup so that it pulls IGN values in certain rows then never puts it back in like most ecus do. If you are tuning and it does this, then you save your retarded IGN rows and end up with a weaker map than stock. I believe FM's defualt maps in the link (turboI and turboII) make around as much HP as your friend is making. THere is alot more room to advance IGN values w/ a t3/T4 setup compared to the T28 FM setups since EGT's are generally alot lower to begin with. Tell him to advance until EGT's are around 1550-1600F under boost at redline (most use 4th gear for this since 5th gets going around 140mph at that point. lol) If he gets knock, add some fuel until it goes away. Advanced IGN values are worth way more than leaning it out. (alos safer as long as you dont go too far)

Granted dnt add so much fuel its unreasonable. I'd imagine he would know this stuff though. FM also supports their Link ecu pretty well, so you could always give them a call and ask for help.

 

"Hakuna"

look it up on Yahoo.com