[Diy_efi] Tuning with too much power for dyno?

[Dave Dahlgren]

Sure run a motec in alpha n mode. do all the programing you can at less b=
oost
but fill in all the tps mapping and then extrapolate the fuel correction =
for
boost from the trend you saw at lower boost.. Go to the track and slowly =
raise
the boost while data logging to make sure your extrapolated fuel is corre=
ct. Of
course you have to fill in the timing map with something sensible to begi=
n with
as well before you raise the boost. We have a customer that has a 13b tha=
t makes
just shy of 800 hp at 18 lbs boost on gas.. and we are looking to bump th=
at up
this winter to where you are headed.900 or so. 1000 is the target but I d=
on't
think we will see it even with alky. I would not bother with the nitrous =
on the
dyno especially a chassis dyno.. too much too fast and it ought to be a s=
eparate
system anyway.
Dave

Matt Porritt wrote:
>=20
> I=92ve got a wee problem.
>=20
> 20B (mazda) engine running Methanol, 2bar + of boost and Nitrous, produ=
ces too
> much power (torque) for the dyno (International Dynometers Dyno Packs =96=
 Hub)
> In 2wd mode they are good for around 800hp, but nowhere near the torque=
 of the
> engine.
> Engine is looking to put out approx 900hp before Nitrous.
> The engine will be able to be tuned to around 5000rpm on the dyno befor=
e
> torque limits, but as its running a 5500rpm stall convertor in it that =
will
> pose problems also.
>=20
> Apart from making MANY drag passes and logging everything and tuning ba=
ck from
> there, does anyone have some ideas that maybe we havn=92t thought of to=
 tune
> this thing?
>=20
> Cheers
> --
> Matt Porritt
> RC Race Cars and Supplies
> ICQ #22776813


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