LS_caddy

Has anybody detuned an LM7 to around 220HP. In Denmark i can add 20% power over stock in an engine swap without having to pay new registration tax. $$$
I guess pulling around 10-15 deg at WOT should do the trick.
Any thoughts?

G Atsma

Do they dyno the car? Do what the carmakers did in the 60s to show a lower power output.
Simply take the power level at a lower RPM, like 4500 or whichever shows 220 or so.

minytrker

iTrader: (13)

That would put it almost 0 degrees timing wot, How are they checking hp? A 100% stock one dyno's low 200's at the wheels already.

G Atsma

The unasked question- Are they measuring power at the WHEELS or the FLYWHEEL?
IF it's at the wheels as Minytrker says above, you might already be close to there since they can't measure flywheel power unless they rip your engine out to do it. Not happening.

LS_caddy

The power is measured at the wheel but corrected for flywheel HP. I pretty much have to show a dyno sheet conducted under some specified EU conditions. It's corrected for 25C and sea level flywheel HP

G Atsma

Limit the TB opening is all I can think of.

LS_caddy

That would be documented and easy to check for the police. My thought is to maybe also add a lot of line pressure to the trans so I waste more than the 20% they assume.
Maybe also run it quite lean for the dyno session. I doubt it would hurt the engine to do a few lean pulls to 5400rpm or so

RoadRash88

What country is this?

EDIT: just re read the post and see op is in Denmark

LS_caddy

Denmark

G Atsma

Too much line pressure is very bad for the trans, and too lean will do damage even in very short term.
There has to be a way to put a "stealth" restriction somewhere that "they" won't detect but is removeable/reversable.
Is a state-owned dyno used, or a private one?
There's always "extra" padding under the gas pedal....
Just so we know, exactly what kind of car are we dealing with here?

Fast355

Restrictor plate?

gametech

iTrader: (1)

Get a spare set of junk wheels and tires for it and foam fill them like logging truckers do. The extra rotational mass will kill your power reading on an inertia dyno.

strutaeng

I was going to suggest putting a brick with duct tape under the gas pedal, LOL

Can you just limit the throttle % on the tune?

LS_caddy

I'm using a drive by cable setup. I might be able to adjust the throttle cable a bit and somehow fool the throttle reading to show 100%. I'm not 100% sure if that is needed though.

Maybe a hidden obstruction in the intake tubing could work

Fast355

Close the spark plug gaps until the electrodes touch on one bank. It will still run smoothly just will not make any power, lol.

G Atsma

Thicker carpet padding under the gas pedal

fst100

iTrader: (5)

is this auto or manual? if auto, like OP mentioned, lower the timing above 4400RPMs from like stock 15* to like 8* and set the RPM shift points at like 53-5600 as to not even hit peak HP.
edit another is run rich, like 1pt richer, ie- current PE is 12.8, set it at 11.8. another is very dirty air filter lol

Scarebird

How much is the tax?

G Atsma

^^^^^This^^^^^^
If one can afford to build and drive an American V8-powered vehicle in any European country, the taxes involved can't be that horrendous.

LS_caddy

It's not to bad if I don't add more than 20% power. If I add more I have to pay registration tax again. That would be around 2000USD for something like this. The worst thing is fuel cost at around 8.50USD a gallon. It's great to daily an old american car though