My GV1124

[SABBAi]

Well guys, I have some interesting news.....Last night I pegged it up the freshly opened freeway on ramp, and the damn boost gauge sat solidly on 12psi.....

So this coming week, I'll be fitting the rising rate fuel reg, and upping the boost a tad. 180kw, here we come

[TX5_turbo88]

niiiiiiiice. Are you using the standard diff or the Tosren LSD?. and how is it holding up with that power?

[rodhog]

Ohnestly I wish I could of seen the Air fuel ratios

as on my woo's chipped Tx-5 - aka tim's tx5

there was enough room IMO to go to 15psi on larger turbo- no problem.
I quess it would depend on the trim but I don't see how it would not cope.
I was getting into the low 11's with ease on 13'psi. true stock turbo but, way too rich but a T25 is not that much more efficent then the IHI in overall terms.

I wish I could see the AFR on the graph would be good comparison. Not just my couriosity but also to see how the eCU is effect by the different changes of the turbos'.

[SABBAi]

Thanks for the kind words guys.

mx_masta, here ya go





I used part of the stock intake and cut it as it had a perfect bend to it. I then used the stock AFM elbow with the filter on the end of that.

Zol, I'm still using the stock diff. Everything seems to be fine with it. It's lasted 12months of 160kw what's another 10?

Rod, I wanted to see A/F ratios as well. but they weren't doing the sniffer thing. I'll find my dyno plot from the R33 turbo setup. From memory, at peak power of 162kw, it was about 12.0:1 A/F. Some think that is too lean, but when you think that the 'optimum' for turbo charged cars is 11.7:1, it's not far off.

But at this level of power output, I'm right on the cusp of the injectors max flow. 330cc theoretically can supply enough fuel for 230hp-ish @ 40psi rail pressure with 100% duty. 162kw is 216hp, and 170kw is 228hp..... would I push it much further, not really. Maybe with the fuel reg and an extra psi or 2, but not much more.

[mazdaspeedF2]

nice. i still havent got mine on the dyno.....nor have i really driven it much....too busy....might have to do it soon though, im keen to see what its making

[fredio54]

Originally Posted by rodhog

Ohnestly I wish I could of seen the Air fuel ratios

Me too.

If you do the calcs for 330cc injectors, 230 flywheel is about the most you would get on a rich tune, so they were probably maxed out and getting leaner, not lean, but leaner ensuring your torque didn't fall away like most f2t dynos do. Impressively flat.

I wonder if this means I can have 385 hp atw? (that's what i calculated i have at the flywheel you see)

Get a wideband on it asap so you know where you are, you'll need that to tune a rrfpr/fmu properly anyway.

Good effort.

Fred.

[rodhog]

Originally Posted by SABBAi

Rod, I wanted to see A/F ratios as well. but they weren't doing the sniffer thing. I'll find my dyno plot from the R33 turbo setup. From memory, at peak power of 162kw, it was about 12.0:1 A/F. Some think that is too lean, but when you think that the 'optimum' for turbo charged cars is 11.7:1, it's not far off.

.

yeah that's the ratio's I got with the stock turbo on 17-19psi on the Tx-5. BUt we didn't power run it on that. only occured due to a hose come off the boost controller - they tapped into it to read boost.
I think it went to 12.5:1.
but I know quite a few cars running for well mainly dyno queens and drag cars going for gold pushing the ratios' into the 12's -12.5:1's Still slightly richer then a N/A but still I don't feel safe.

but I think Woo/Barry did a good job, Considering Tim's was one of the early ones he did.

interesting to see how it all is compared to the hi-flow turbo's Always wanted to try that on tim's Tx-5.
too bad it did a head gasket in the end.

[SABBAi]

I'll agree that Barry has done a fantastic job. I've seen a few local TX5 guys making this sort of power with full tunable after market management. One car has a V500, 550's and his tuning is too scared to push it further. That can made 174kw with a torque curve that is all over the shop.
If anyone asks me what the best ECU is for 150-170 atw, I also tell them Woo chip. Good fuel economy, good power, locally produced and cheap. What more could you want???

12.5:1 Slightly richer than N/A? 13.7:1 is slightly richer than N/A

I don't think I'm am really leaning on the engine to make power. If I was up at 240kw with 12.5:1 ratios, yeah I'd be concerned then.

[fredio54]

Originally Posted by SABBAi

12.5:1 Slightly richer than N/A? 13.7:1 is slightly richer than N/A

On a good setup best power is almost always found in the 12.0 - 13.5 range, rarely leaner. Any excess fuel serves only to reduce power, cool the charge, cool the cylinder walls and combustion chamber and thereby prevent detonation.

If you can't go to 12.0 then the compression or advance or octane or boost is wrong and it's not a good setup. Poor setups might require rich mixtures to exist at all, but it will always be a hack.

Low compression + high boost + normal octane = ftw
high compression + high boost + high octane = ftw
high compression + low boost + normal octane = ftw
low compression + low boost + low octane = ftw (this is mazda)

etc.

Rich is just a patch/safety measure. Mazda's stock tune is a 91RON 10psi tune. bump the octane, afr, and boost to where they should be and you are talking turkey :-)

Fred.

[rodhog]

I preffer to see a safety margin on most street cars.

If You were to go all out - sure run it leaner. but at WOT I think on N/A with nice overlap on a cam I've always noticed around 12.7:1 to optimum and safe. I know others like to lean out but I always think of worst case. I don't see why you would risk it.
Every engine is different some seem to like it richer then others.
like a HEMI I know of doe not like lean mixtures can't even get crusie down into the 14's won't run. stock cam too.

Each to there own, if you built it and trust it, fine, run it leaner. Car makers are now doing that. To try and get Emission down

but I like to see nice fat ratio's that always on the side of caution over power.
You always see different sides to it, with cars might be tested differently from the Dyno - with changes in Atmospheric pressure and to loading.
Cars might ping just a bit because it was not fat enough or when it's one of them really -really hot days.

I remember a rotary cruise, up the mountains - it was so, alot of cars overheated and some, the webbers just not providing enough fuel. One car was pinging it's head off up hill.

Or even the RB30 I've been working with, everything was fine untill the WSID, drag radials and it was fine on street - fine every other time. But it pinging into 2nd gear and all it was just not enough for that place and loading.
A quick change up top in the fuel curve it was fine.

back on the dyno it did loose a bit of power 2 Kw at the rear.