How much boost did you run in 2009?

I can't help but thinking this is more boost or timing related. Yes you are running lean but at the Max BHP RPM point you are around 12.5-12.6:1 AFR which (whilst I agree is not really safe at that boost level on our engines unless you are running super low CR) I would expect it to make similar power or maybe even more power. The maximum power point for AFR normally is stated at 12.6:1, run richer for safety not more power.

It could be that the boost level has dropped off or a correction has pulled timing.

Get your AFR sorted but I am not convinced that tweaking it alone will get you back the power.

If you are running lower boost it could be that the mapped has omitted mapping the lower boost cells or has applied some ignition retard to help spool up.

Many options so we need to see your map

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JP
GT4DC Treasurer

Grey St185 RC
Silver BMW E46 M3
Multicolour yawn Honda VFR400
Silver Honda Civic Type-R

Could the cam timing have changed in that time ? New belt now a tooth out, or stretched belt ?

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If at first you don't suck seed, try drier grain.

Could the cam timing have changed in that time ? New belt now a tooth out, or stretched belt ?

Also, have the regulations now changed allowing more bio-ethanol in petrol ?

_________________
If at first you don't suck seed, try drier grain.

Hi JP, In 2009 the car ran the same boost, around 1.4Bar..
It was a nice sunny day, not very hot, there are some corrections in place for high intake temps but i don't believe we got anywhere near those.
Something worth noting Charlie was doing the power runs in 3rd gear, i have always thought they were done in forth?

I really don't believe that my fuel pump or FPR are to blame here, Charlie and Ryan have said this is what it could be?
imo if it was either of these parts the AFR would look a lot different and not go richer at the end of the run!

Take a look at the other Print outs, incl 2009 and most recent runs.

http://www.flickr.com/photos/69betsy69/ ... 007787619/

I don't think that i have improved the voltage that much to cause an issue such as this..

What tells the ecu to inject the amount of fuel that it does, just Temp and Map sensor? does the ecu ignore how far open the throttle is when working out how much fuel to inject?

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Steve Gillies
ST-165 88 UK

www.GT4-Play.co.uk

Hi Chris, The belt is riding in the same place and is good condition, Genuine Toyota belt was fitted.
regarding if the timing is out, its possible?
the car keeps bloody stalling still i know that! not every time i pull up to a junction but more times than not...

The car would of been mapped on Shell optimax 98 Ron from memory where as now we get Shell V-Power or as its been rebranded Nitro + 99 Ron?

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Steve Gillies
ST-165 88 UK

www.GT4-Play.co.uk

I do have some copies of the map which can be viewed in FC-Edit if you think its worth looking over or maybe comparing to another known good map?
.Dat file from memory, how can i post it on here?

_________________
Steve Gillies
ST-165 88 UK

www.GT4-Play.co.uk

Sign up to dropbox for file sharing. Easier to use than photobucket for piccies too.

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If at first you don't suck seed, try drier grain.

Didn't think of that one

here you go..

https://dl.dropboxusercontent.com/u/667 ... change.dat

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Steve Gillies
ST-165 88 UK

www.GT4-Play.co.uk

There is also a battery voltage Vs ignition timing....

Not betsys


Therefore the fueling and timing could be out as a result of better battery voltage.

_________________
JP
GT4DC Treasurer

Grey St185 RC
Silver BMW E46 M3
Multicolour yawn Honda VFR400
Silver Honda Civic Type-R

Betsy actual map

2 places voltage effects fueling and ignition





Fuel & Inj Map

So will be cheaper to disconnect the other battery cable then lol as its looking like a complete remap?

_________________
Steve Gillies
ST-165 88 UK

www.GT4-Play.co.uk

You do know higher octane burns slower than lower octane and thus without more ignition to compensate makes less power ? Not that I would believe the level you are seeing from 98 to 99.

Certainly back in the day when four star to unleaded changes where typically around 6 degrees retard for the Ron rating of 97 ish to 95 unleaded but only a 2% power loss.

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Darryl

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Darryl

Maybe, plug your new WB in and try it if the ratios richen up again, then reconnect it and you can try copying the values in the 2 areas from the voltage below and seeing what the ratio is like then? if you can access them from the hand commander?

if not id leave it disconected till you want a remap.

Normally the only ignition effect of battery voltage is the 'dwell time' - i.e. how long you charge the coil before release. Like injectors, a lower voltage means it takes longer to reach the same current level. I'm not sure what units the PFC figures are, presumably a multiplying factor from 'nominal' dwell time (2.5mS ish for gt4 ignition iirc).

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If at first you don't suck seed, try drier grain.

And this dyno, is it the same one as tested on before ? Ie. Some dyno operators like you to think you've got good power. Maybe the AFR meter they've got has just started to go off ?

--
Darryl

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Darryl