<font face="Verdana, Arial" size="2">Saturday marked the calendar as my first session for the Lude on a large
wheel dynojet. I have had the car over a year, but a couple friends in our
local import group got a killer deal for $50 for 6 runs with wideband O2. I
have learned a lot, and some of it is scary, so please read this long post
if you have an AFC or flapper valve mods.
Large wheel dynos typically show about 5-6 HP lower on small power cars
like ours, because they are calibrated to accept big power guys (like Nascar
teams) onto the dynojet. For most of you, that is review.. on to the meat
of the topic.
My mods (only listed are the ones that could effect the result): 2000
(base) Prelude 5 speed with AEM cai, flapper valve mod, V-AFC, Greddy PE,
and 15" Volk TE-37s with 205/50/15s resulting in -4% speedo/circumference
(-7% FDR) error. The testing was done in 4th gear. Mods above are good for
consistent 14.7s at 96mph in the 1320.
Flapper Valve: OK, unless you have BIIIIG power early in the rev band,
this mod sucks like crazy. I lost 8 to 4 Tq below 5100 rpm. Reconnecting
it helped Tq AND HP below 5000 significantly. In fact, the flapper bypass
graph curves were NEVER above the flapper connected ones, even in the
"advertised" above 3000 range. Unless you have F.I. or bigger power early
on, reattach that sucker.
VAFC: Unfortunately, I saw V-AFC settings on the net from a very
similarly modded 5th gen, and used them. They were 0 to -4 on LVt and -4 to
-5 on HVt. My rollover was set at 4700rpm. Instead of zeroing it out, I
was curious what these settings netted me. Well, it turned out to be 168 HP
and 136 Tq. Not too shabby for a large wheel dyno with few mods. Well, it
turns out that my settings sucked. Bigtime. **If any of you are running
the -4 to -5 settings that are from the internet without dynoing, you
SHOULDN'T be! Every car is different. In several low and mid patches in
the curve, my car was a bit too lean. This was vexing to me, as my car
blows rich exhaust soot all over my trunklid and bumper (the car is white
and easy to see the soot). Well, the problem was way up top around 6.5k to
fuel cut. We were able to go quite a bit leaner up there. Don't ask me how
lean, because I don't want anyone using my settings and frying their car in
case mine is an anomoly. The revised settings were good for 174.4 HP and
140.2 Tq with a very noticible pick up from 6500 to redline that widened to
up to 10HP at 7400/7500 rpm. I can't wait to hit the 1320, and the car
feels like a banshee on the highway!
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