dyno tune numbers!!!!
Race Director
Joined: Jul 2005
Posts: 11,308
Likes: 1
From: The Beautiful Greater Bay Area California
Originally Posted by Patman
This is why dyno tuning is so important! I bet the tuner found that the engine was running way too lean or way too rich, and was probably getting a lot of knock retard too. So by setting up the air/fuel mixture properly, and eliminating the knock retard, it is allowing the engine to make the proper level of horsepower.
Team Owner
Joined: Mar 2001
Posts: 25,889
Likes: 7
From: Virginia Beach
CI 3-5-6-7-8 Veteran
Your baseline is way low with those mods. My stock '01 Z06 put down 341/342 then after a vortex and Kooks w/ cats and stingers it made 371/374 un-tuned.
Most bolt-on and tuned Z06's are in the mid 380's to low 390's... so your missing 20 somewhere.
Most bolt-on and tuned Z06's are in the mid 380's to low 390's... so your missing 20 somewhere.
Melting Slicks
Joined: Sep 2005
Posts: 2,625
Likes: 1
From: Rhode Island
Originally Posted by JDs00PewterCoupe
The base line does seem low - figuring a 15% drivetrain loss, a stock Z06 with 405 bhp should be making around 344 RWHP. With the headers you should have picked up a few horses.
Thread Starter
Burning Brakes
Joined: Jun 2005
Posts: 807
Likes: 1
From: Miami Lakes FL
To me it seems weird because the baseline seems low but the 380 RWHP seems to be int he ball park. Maybe my baseline was very low because the headers were making me run to lean so I couldnt produce any more power.
Drifting
Joined: Oct 2003
Posts: 1,540
Likes: 0
From: bloomfield nj
you're in the park,and before the tune depending on how long you drove it for before the tne,the pcm fattened you up for the lean condition[i'm guessing your fuel trims were +18-19]for LTFT and STFT were like +20[-25/+25 turns on the cel].my car with a CAI,airbridge,lg headers w/cats,b&b bullets,tuned,was 390 RWHP,torque was 371.i was happy.before the tune i was a dog because my pcm went into "stupid mode" compensating for all the new air.
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Race Director
Joined: Apr 2004
Posts: 16,135
Likes: 5
From: Newberry FL
Cruise-In VIII Veteran
St. Jude Donor '07
Originally Posted by JDs00PewterCoupe
The base line does seem low - figuring a 15% drivetrain loss, a stock Z06 with 405 bhp should be making around 344 RWHP. With the headers you should have picked up a few horses.
Melting Slicks
Joined: Aug 2000
Posts: 2,304
Likes: 154
From: Green Bay WI
Don't worry. Your tuner got you to 380 RWHP, which is right.
For whatever reason, the baseline dyno was low, but you're OK now.
For some reason, the effect of your mods didn't show up in your baseline.
33 RWHP is not typical from a tune on a bolt-on car.
So, if your baseline with headers was 20 HP more, say 367 RWHP, and you picked up 13 RWHP from the tune to 380 RWHP would you happy? Most people would...
Or, are you expecting to go from 367 RWHP with headers, and still get 33 from the tune and be at 400 RWHP?
From the dyno's I've seen, you need a cam to be at 400 RWHP, so 380 is about right.
For whatever reason, the baseline dyno was low, but you're OK now.
For some reason, the effect of your mods didn't show up in your baseline.
33 RWHP is not typical from a tune on a bolt-on car.
So, if your baseline with headers was 20 HP more, say 367 RWHP, and you picked up 13 RWHP from the tune to 380 RWHP would you happy? Most people would...
Or, are you expecting to go from 367 RWHP with headers, and still get 33 from the tune and be at 400 RWHP?
From the dyno's I've seen, you need a cam to be at 400 RWHP, so 380 is about right.
Drifting
Joined: Sep 2004
Posts: 1,727
Likes: 20
From: Carson City, NV
Hi folks...thought I'd post up my results from my dyno run today. I have a basically stock 98 C5 MN6 with LGLT headers, high-flow cats, crossover pipe, B&B Bullets and VaraRam. It's never had a dyno tune or even been on the dyno until today. So reading this thread, I calculated the following before I went:
345 stock HP at the flywheel
35 headers, cats, crossover pipe
22 B&B Bullets
5 VaraRam
407 HP at the flywheel - 61 HP (15%) loss = 346 HP at the wheels
Dyno numbers came in at 331 HP and 354 lbft torque which was disappointing. This was on a Dynapack dyno at Synergy Motorsports. Rick said he noticed I had some detonation, so I'm wondering how much I could gain with a good tune. What do you guys think?
I noticed stock C5s were running 280 to 305 HP and stock Z06s were coming in around 360 to 370. A brand new Z06 LS7 with headers dyno'd just shy of 500 rear wheel horsepower. I think I need a LS7 in my C5 now.
345 stock HP at the flywheel
35 headers, cats, crossover pipe
22 B&B Bullets
5 VaraRam
407 HP at the flywheel - 61 HP (15%) loss = 346 HP at the wheels
Dyno numbers came in at 331 HP and 354 lbft torque which was disappointing. This was on a Dynapack dyno at Synergy Motorsports. Rick said he noticed I had some detonation, so I'm wondering how much I could gain with a good tune. What do you guys think?
I noticed stock C5s were running 280 to 305 HP and stock Z06s were coming in around 360 to 370. A brand new Z06 LS7 with headers dyno'd just shy of 500 rear wheel horsepower. I think I need a LS7 in my C5 now.
Thread Starter
Burning Brakes
Joined: Jun 2005
Posts: 807
Likes: 1
From: Miami Lakes FL
Originally Posted by Cscokd
Hi folks...thought I'd post up my results from my dyno run today. I have a basically stock 98 C5 MN6 with LGLT headers, high-flow cats, crossover pipe, B&B Bullets and VaraRam. It's never had a dyno tune or even been on the dyno until today. So reading this thread, I calculated the following before I went:
345 stock HP at the flywheel
35 headers, cats, crossover pipe
22 B&B Bullets
5 VaraRam
407 HP at the flywheel - 61 HP (15%) loss = 346 HP at the wheels
Dyno numbers came in at 331 HP and 354 lbft torque which was disappointing. This was on a Dynapack dyno at Synergy Motorsports. Rick said he noticed I had some detonation, so I'm wondering how much I could gain with a good tune. What do you guys think?
I noticed stock C5s were running 280 to 305 HP and stock Z06s were coming in around 360 to 370. A brand new Z06 LS7 with headers dyno'd just shy of 500 rear wheel horsepower. I think I need a LS7 in my C5 now.
345 stock HP at the flywheel
35 headers, cats, crossover pipe
22 B&B Bullets
5 VaraRam
407 HP at the flywheel - 61 HP (15%) loss = 346 HP at the wheels
Dyno numbers came in at 331 HP and 354 lbft torque which was disappointing. This was on a Dynapack dyno at Synergy Motorsports. Rick said he noticed I had some detonation, so I'm wondering how much I could gain with a good tune. What do you guys think?
I noticed stock C5s were running 280 to 305 HP and stock Z06s were coming in around 360 to 370. A brand new Z06 LS7 with headers dyno'd just shy of 500 rear wheel horsepower. I think I need a LS7 in my C5 now.
