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[tuner23] Re: XR4Ti Dyno results
Sure I'll try..
I had limited time on the dyno and I was under the impression that it
would cost me $130/hr so I was hurried in my decision making but I
just highlighted a bunch of points on the Base fuel map and richened
stuff up as I noticed I was running completely lean on the A/F at
part throttle. Then I went to the WOT fuel multiplier and and added
points for 3k, 3.5k, 4k, 4.5k, 5k, 5.5k, 6k, and 6.5K rpm I started
playing with those until I got the A/F where I wanted it (wideband on
the dynojet). Weird thing is that on one run I only changed one rpm
point multiplier and all the sudden the whole map went rich.. I had
to almost start from scratch and redo it. My dyno time wound up
being really cheap so if I get the same deal this time I'll spend a
little more time on the base fuel map since they do have the load-
track feature on the dynojet (ability to hold the rpm of the drum, so
I can tune th part throttle maps). Another thing is I didn't see a
power benefit from running for example 11:1 A/F or 12:1 A/F, only
when I went leaner than 12:1 did I see power start to drop, actually
the first run was really lean! and after I richened things up the
power picked up dramatically. Most of the gain was done on the first
few runs, after that I was tweaking the map but I didn't gain too
much more power, but I did gain about 10ft-lbs of torque down low
from fine tuning. I will look at the WOT multipliers tomorrow (ran
the battery dead on the laptop tonight playing with the tuner and the
new cam I put in the car) and post them. I do know that I had to
richen things up alot from the stock 1.1 settings. Some of my
setting are from 1.45 to 1.7 When I ran the stock map by accident it
was so lean it started to misfire and the A/F dropped off the chart,
the car wouldn't even pull. My goal is to make around 375hp at the
wheels on pump gas(with the new cam, then retard it a few degrees),
400-425hp with higher octane fuel (higher boost, 28psi+) and 475-
500hp at the wheels with the 75shot of nitrous. I'm ordering up a
set of drag tires tomorrow for a set of 15x7.5 inch rims, anyone have
any recomendations?
Martin
BTW I installed the new cam tonight and it feels real good, more dyno
tuning coming up in the next few days!
--- In tuner23@y..., Brad Anesi <brad.anesi@n...> wrote:
Martin- Can you give us some general guidelines for what things
you
tweaked, and in which direction?
Brad
-----Original Message-----
From: Martin Musial [mailto:mjmusial@t...]
Well finally took the XR to a dyno tonight.. spent 3 hours dyno
tuning
it with the EEC tuner.. let me tell you.. a must have device it is!
Went in there and made 302 hp and 326ft-lbs of torque at the wheels.
After I left we had 325hp and close to 360 ft-lbs of torque. Full
boost
at 3400 rpm (24psi on pump gas) and the torque curve was as flat as
Kansas from 3500 all the way to 6K rpm. The car has more power
under
the curve also. 3 hours cost me $200 with a wideband.. a pretty
sweet
deal. The drive back to my shop was the best.. the new found power
and
the general feel of the car is amazing, second gear rips the tires
loose
with amazing ease when boost hits. This weekend I'm doing our AMS
cam
swap and taking it back there to compare the two. This was with the
ranger cam set straight up and 10-11 deg advanced base timing.
After
the new cam swap I think I'll do a .82 A/R housing (now it's a .63)
since the turbo spools so quick now.
[Non-text portions of this message have been removed]
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