Bad dyno run for my Lude.. huge power drop @VTEC changeover

JMBW · Post by **JMBW** » Sat Apr 26, 2014 7:08 pm

Was quite surprised when I heard my Lude do a power run on a dyno today.. It really sounded like it hit a revlimiter right after VTEC crossover, also seemed like it dropped out of VTEC briefly. Really noticeable on the print out.

Should I be worried

any logical explanations? or similar experiences?

Post by **Merlin** » Sat Apr 26, 2014 7:39 pm

What 5th gen do you have and what engine does it have in it? What make of dyno was it on? HK is just horsepower? Rather than KW.

Going by the amount of torque things are not that bad. At 6600 rpm the engine is making 198 nm / 146lb/ft. (6600 x 146) / 5252 = 183.4 bhp.

If you have an H22a5 with no mods that figure would be about bang on the money IMO.

Post by **4thgenphil** » Sat Apr 26, 2014 7:50 pm

Have u dropped the vtec xover ? That will cause ot ro struggle lower in vtec

JMBW · Post by **JMBW** » Sat Apr 26, 2014 8:07 pm

Yes, you are straight on the money Merlin... this is a H22A5 automatic with no mods, and the VTEC xover is not moved...

I might remember one instance before when going in 4th gear and accelerating through the xover and feeling a slight delay/drop in power, but I can go through xover in 1-2-3 gear with good VTEC xover and linear power..

But now my question would be: What can cause this behaver in the xover? clogged oil channels? VTEC solinoid? Oil Pressure? worn mechanism? other?

I had a look in the valvecover + head and very recently and it was really fine, absolutely no gue or sludge build-up.

Cutz · Post by **Cutz** » Sat Apr 26, 2014 8:09 pm

first place to check is the vtec filter buddy, make sure that's all good...obviously oil levels are the next one.

Post by **Merlin** » Sat Apr 26, 2014 8:56 pm

Perhaps some injector cleaner as well. It could be a slight hesitation?

Post by **4thgenphil** » Sat Apr 26, 2014 9:16 pm

I'm gunna be honest I have never had a standard lude so dont kknow what the crossover is

juat looked a little low from your graph

BMCC · Post by **BMCC** » Sun Apr 27, 2014 11:01 am

Vtec engages at 5250rpm. The drop in the curve is about 4800 which is when the dual runners in the inlet mani change from the long to short path. So the graph on this aspect is fine.

89 UKDM BA4 4WS (resto job!) · Post by **wurlycorner** » Sun Apr 27, 2014 11:06 am

4thgenphil wrote:I'm gunna be honest I have never had a standard lude

The Acura type r?

Post by **Donald** » Sun Apr 27, 2014 11:06 am

Had a Tanabe exhaust IIRC