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Dyno Run Gone Wrong?

badnerve

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Hey,

I got my VP Calais (Buick 3800) tuned for the second time but got less power than the first time I tuned it with more mods?! SO:

For tune No. #1:

Wade 992a Cam, 1.8 YT High Rollers, Mahle Pistons, 2.5k Converter, Lukey Extractors + High Flow Cats + 2 1/2' Exhaust, Custom Rods, 40thou Oversized Rings, 10:1 Comp, Machined and Bored. Stage 2 Shift Kitted Auto - 4L60.

Power: 142rwkw @ 407nm Torque.

For tune No. #2:

Added Twin Throttle Body & 2x Brand New K&N Pods, Bosch Blue Top 775 Injectors 24lb & Freshened Up Motor a Little.

Power: 129rwkw @ 680nm Torque.

Has something gone wrong or is one of my mods robbing me of power. Can't work it out?

EDIT: After the second tune, it sounds a lot more 'droning' on low revs compared to the first one. Pulls very similar though.
 

hakhawk

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was the memcal retuned the second time?
 

badnerve

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No I just had the ECU reflashed. Yes it was re-tuned...
 

yZoH

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The dual throttle intake did it... Slap the old manifold back on an get your power back.

Cheers
Mat
 

badnerve

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The dual throttle intake did it... Slap the old manifold back on an get your power back.

Cheers
Mat

What makes you say that? Still doesn't make sense as to why I made more Torque and less RWKW?
 

Munz

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Ambient temp can have an effect on dyno readouts also how they strap it down
If you had the same mods and dyno'd your car 6 months apart result will be different

The only way to tell if you've made more/less power is to leave car strapped on the dyno and swap manifold over and re-run it
 

badnerve

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Ambient temp can have an effect on dyno readouts also how they strap it down
If you had the same mods and dyno'd your car 6 months apart result will be different

The only way to tell if you've made more/less power is to leave car strapped on the dyno and swap manifold over and re-run it

Well it's not exactly cheap to dyno lol. I pay $800 a run... So i'd rather find the problem before re running it.
 

hakhawk

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im guessing you're paying for tuning at the same time. a dyno "run"(where they strap the car down and give it a run to determine power) shouldnt cost you more than $150.

have you got dynosheets from the last 2 runs, preferably with air/fuel ratios on them?
 

Kiddo

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Is this the same dyno each time? Same Gear? Same Tuner?
 

yZoH

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Well it's not exactly cheap to dyno lol. I pay $800 a run... So i'd rather find the problem before re running it.

Simple "Power Runs" are normally $50-100 for 3 runs. Depending on the workshop.

Cheers
Mat
 
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