Disappointing Dyno results
Thread Starter
Racer
Joined: Sep 2000
Posts: 273
Likes: 0
From: Valley City ohio
Disappointing Dyno results
I've got a 2000 A4 with a Vararam intake. After much research and debate,I bought a set of Kooks headers and mid pipe.After having them installed and a re-tune,the end result was a 6hp gain!! I had the car tuned at the same place 2yrs ago.They are a reputable performance shop that does alot of performance work on vettes.I expected at least a 10-15hp gain.
Safety Car
Joined: Aug 2011
Posts: 4,436
Likes: 404
From: Portland OR
Hopefully 1 3/4" headers, right? Not 1 7/8.
On a stone stock engine, I bet 1 5/8 would do better, but no one makes them. Std SB Chevs never needed 1 3/4 till the power got up there a ways.
I think hard to tell from a 2 y/o dyno comparison.
Do you have a comparison of the complete curves? Max numbers rarely tell the whole story.
Ron
On a stone stock engine, I bet 1 5/8 would do better, but no one makes them. Std SB Chevs never needed 1 3/4 till the power got up there a ways.
I think hard to tell from a 2 y/o dyno comparison.
Do you have a comparison of the complete curves? Max numbers rarely tell the whole story.
Ron
Burning Brakes
Joined: Feb 2012
Posts: 759
Likes: 22
From: Slatington PA
Correct me if I'm wrong, but I don't believe the horsepower gains of a Vararam can be substantiated on a dyno. You need to be driving down the down with air flowing through it to notice the gains.
Thread Starter
Racer
Joined: Sep 2000
Posts: 273
Likes: 0
From: Valley City ohio
Corvette Stories
The Best of Corvette for Corvette Enthusiasts
10 Revolutionary 'Corvette Firsts' Most People Don't Know
Joe Kucinski
5 Reasons to Upgrade to an LS6-Powered Corvette; 5 Reasons to Stay LT2
Michael S. Palmer
2027 Corvette vs The World: Every C8 vs Its Closest Competitor
Joe Kucinski
10 Most Common Corvette Problems of the Last 20 Years!
Joe Kucinski
5 MOST and 5 LEAST Popular Corvette Model Years in History!
Joe Kucinski
2027 Corvette Buyer's Guide: Everything You Need to Know!
Joe Kucinski
10 Things C8 Corvette Owners Hate (But Won't Tell You)
Joe Kucinski
10 Best Corvettes Coming to Barrett-Jackson Palm Beach 2026!
Brett Foote
Every Corvette Grand Sport Explained! (C2, C4, C6, C7, & C8)
Joe Kucinski
Le Mans Master
Joined: Nov 2005
Posts: 6,993
Likes: 25
I always thought most of these "mods" on a stock motor were a black hole for $$$$, guess this proves it.
Bet you could have put a 100hp bottle on it for 1/2 the $$$'s you've already dropped on the mods you've made.
Bet you could have put a 100hp bottle on it for 1/2 the $$$'s you've already dropped on the mods you've made.
Melting Slicks
Joined: Aug 2000
Posts: 2,618
Likes: 5
From: Overland Park KS
Don't take this personally because there are a lot of people on forums who post only their max hp values and ask why didn't they gain more??
Here are some things you should consider when looking at the ENTIRE dyno graph.
1) You could have gained 15 hp from 2k-3k rpm but since it's not the maximum HP/TQ you just ignored it.
2) You don't mention TQ how much TQ did you gain?
3) What does your Air/Fuel ratio look like along your dyno graph?
Can you post the before and after graphs???
Here are some things you should consider when looking at the ENTIRE dyno graph.
1) You could have gained 15 hp from 2k-3k rpm but since it's not the maximum HP/TQ you just ignored it.
2) You don't mention TQ how much TQ did you gain?
3) What does your Air/Fuel ratio look like along your dyno graph?
Can you post the before and after graphs???
Drifting
Joined: Apr 2009
Posts: 1,898
Likes: 9
From: Morrisville PA
Don't take this personally because there are a lot of people on forums who post only their max hp values and ask why didn't they gain more??
Here are some things you should consider when looking at the ENTIRE dyno graph.
1) You could have gained 15 hp from 2k-3k rpm but since it's not the maximum HP/TQ you just ignored it.
2) You don't mention TQ how much TQ did you gain?
3) What does your Air/Fuel ratio look like along your dyno graph?
Can you post the before and after graphs???
Here are some things you should consider when looking at the ENTIRE dyno graph.
1) You could have gained 15 hp from 2k-3k rpm but since it's not the maximum HP/TQ you just ignored it.
2) You don't mention TQ how much TQ did you gain?
3) What does your Air/Fuel ratio look like along your dyno graph?
Can you post the before and after graphs???
When you are accelerating, you aren't just at 6k rpms the whole time
. The average gain of power under your racing powerband (4500-redline) is the most important number.
Team Owner
Joined: May 2003
Posts: 23,480
Likes: 9
From: East Meadow NY
St. Jude Donor '12
Racer
Joined: Nov 2010
Posts: 397
Likes: 33
From: Campton Hills, Illinois
Bull
Hello,
I did the following mods to my bone stock 2002 Z last month. Vararam, TB by Shaner, Mail in tune by ECS and LG streets.
Now I've never had it tuned before but the difference is very very noticable.
This is not only me comparing it but my wife and two teenage sons agree the thing honks now. I don't know what the HP increase may have been but to be honest I don't care.
I did the following mods to my bone stock 2002 Z last month. Vararam, TB by Shaner, Mail in tune by ECS and LG streets.
Now I've never had it tuned before but the difference is very very noticable.
This is not only me comparing it but my wife and two teenage sons agree the thing honks now. I don't know what the HP increase may have been but to be honest I don't care.
Le Mans Master
Joined: Jun 2008
Posts: 5,284
Likes: 235
From: Rockledge FL
One disappointing dyno proves nothing. There are many many more here that say long tubes do a lot better than 6hp
Race Director
Joined: Aug 1999
Posts: 16,935
Likes: 26
From: Lackey, my own dragstrip VA.
Virginia Events Coordinator
Cruise-In IV Veteran
Cruise-In V Veteran
Cruise-In VI Veteran
Cruise-In VII Veteran
NCM Ambassador
The dyno is just another tool not the final word..........
My 2000 A4 with just a tune, FLP 1 3/4 headers & x- pipe, PRT catback and CAI dynoed .........310 on a good day
but
BEST TIMES W/ 275/40/17 Nitto 555R street tires @ Richmond Dragway 11/9/03 60'=1.91, 1/8=8.05 @89.32mph, 1/4=12.47 @ 111.91MPH (3,470 lbs. race ready)
My 2000 A4 with just a tune, FLP 1 3/4 headers & x- pipe, PRT catback and CAI dynoed .........310 on a good day
but
BEST TIMES W/ 275/40/17 Nitto 555R street tires @ Richmond Dragway 11/9/03 60'=1.91, 1/8=8.05 @89.32mph, 1/4=12.47 @ 111.91MPH (3,470 lbs. race ready)
Le Mans Master
Joined: Nov 2005
Posts: 6,993
Likes: 25
Many of these kind of mads make the car louder giving people the illusion of power. Many times it moves the power curve a little or maybe adds a few hp. Still seems like a lot of $$$ for minimal upside. Better ways to make power.
Premium Supporting Vendor
Joined: Oct 2004
Posts: 23,597
Likes: 1,221
From: Providing the most proven supercharger kits for your C5/6/7 609-752-0321
Hello,
I did the following mods to my bone stock 2002 Z last month. Vararam, TB by Shaner, Mail in tune by ECS and LG streets.
Now I've never had it tuned before but the difference is very very noticable.
This is not only me comparing it but my wife and two teenage sons agree the thing honks now. I don't know what the HP increase may have been but to be honest I don't care.
I did the following mods to my bone stock 2002 Z last month. Vararam, TB by Shaner, Mail in tune by ECS and LG streets.
Now I've never had it tuned before but the difference is very very noticable.
This is not only me comparing it but my wife and two teenage sons agree the thing honks now. I don't know what the HP increase may have been but to be honest I don't care.
Glad to hear your happy with the results from our mail order tune!
Thanks!!
