Notices
Aston Martin DB7, DB9, DBS, Vantage V8, Vanquish, and Classic models

More HP what found

 
  #1  
Old 04-29-2016, 04:08 PM
handyman2009's Avatar
Registered User
Thread Starter
Join Date: Oct 2015
Location: Ottawa, Ontario, Canada
Age: 55
Posts: 1,126
Rep Power: 58
handyman2009 is a splendid one to beholdhandyman2009 is a splendid one to beholdhandyman2009 is a splendid one to beholdhandyman2009 is a splendid one to beholdhandyman2009 is a splendid one to beholdhandyman2009 is a splendid one to beholdhandyman2009 is a splendid one to beholdhandyman2009 is a splendid one to behold
More HP what found

I was just reading the PH website and this guy (8Tech) did some good work. Have a look

http://www.pistonheads.com/gassing/t...f=70&t=1591564
 
  #2  
Old 04-29-2016, 04:20 PM
Registered User
Join Date: Apr 2009
Location: NoVa
Posts: 4,386
Rep Power: 289
telum01 has a reputation beyond reputetelum01 has a reputation beyond reputetelum01 has a reputation beyond reputetelum01 has a reputation beyond reputetelum01 has a reputation beyond reputetelum01 has a reputation beyond reputetelum01 has a reputation beyond reputetelum01 has a reputation beyond reputetelum01 has a reputation beyond reputetelum01 has a reputation beyond reputetelum01 has a reputation beyond repute
I looked into doing that a few years ago. Reached out to a company that did the job for me on another car (a built '05 STi). Their response:

"We've been offering the service because our customers want it. In theory, it should smooth out the airflow, but we haven't been able to show any noticeable difference on a flowbench."

And the thread discussing intake setups:
https://www.6speedonline.com/forums/...e-airflow.html

If the guy got 10.7 HP out of porting the throttle body, that's pretty impressive. The TBs on our cars are already very, very large. Once air flows through them, there's still a ton of disturbance between the TB and cylinders for the air to deal with - much more than what's found in the TB itself.

I considered doing the work myself (I street ported a rotary engine to great results, which is FAR more involved than a TB), but the results didn't seem promising enough without doing the TB *and* intake manifold.
 
  #3  
Old 04-29-2016, 04:25 PM
handyman2009's Avatar
Registered User
Thread Starter
Join Date: Oct 2015
Location: Ottawa, Ontario, Canada
Age: 55
Posts: 1,126
Rep Power: 58
handyman2009 is a splendid one to beholdhandyman2009 is a splendid one to beholdhandyman2009 is a splendid one to beholdhandyman2009 is a splendid one to beholdhandyman2009 is a splendid one to beholdhandyman2009 is a splendid one to beholdhandyman2009 is a splendid one to beholdhandyman2009 is a splendid one to behold
Telum01,

Do I read his graph properly, he shows 447.4HP (I assume it is at the wheel as he drove the car to let the ECU adjust) and over 420ft/Tq ??
 
  #4  
Old 04-29-2016, 04:30 PM
Registered User
Join Date: Apr 2009
Location: NoVa
Posts: 4,386
Rep Power: 289
telum01 has a reputation beyond reputetelum01 has a reputation beyond reputetelum01 has a reputation beyond reputetelum01 has a reputation beyond reputetelum01 has a reputation beyond reputetelum01 has a reputation beyond reputetelum01 has a reputation beyond reputetelum01 has a reputation beyond reputetelum01 has a reputation beyond reputetelum01 has a reputation beyond reputetelum01 has a reputation beyond repute
Sorry! Just realized that's on a DB9, not a V8V.

I'm not sure what the output of a DB9 would be with exhaust and tune, let alone how TB porting would affect the results.
 
  #5  
Old 04-29-2016, 10:40 PM
speedracer800's Avatar
Registered User
Join Date: Jun 2010
Location: Lake Geneva, WI
Posts: 723
Rep Power: 40
speedracer800 is a jewel in the roughspeedracer800 is a jewel in the roughspeedracer800 is a jewel in the rough
I got to believe most all of the 10hp he saw was from the secondary cats.. I think there's other dyno information out there showing 10-12hp from the exhaust alone is pretty much expected.

Still a pretty trick little mod that I can certainly see myself taking on some long cold night next winter.
 
  #6  
Old 04-30-2016, 09:29 AM
embdenb's Avatar
Registered User
Join Date: Sep 2015
Location: Florida
Age: 74
Posts: 672
Rep Power: 35
embdenb is a name known to allembdenb is a name known to allembdenb is a name known to allembdenb is a name known to allembdenb is a name known to allembdenb is a name known to all
Reminds me of an article on NASCAR engine builders preparing an engine for Daytona. The shaft holding the throttle plate was made thinner and the screws holding the throttle plate filed down so that they would not interfere with the air flow. Hp gains were minimal at best and only in the 7 to 8 thousand rpm range.
I don't believe you can get that much hp from this modification. It's what I call a feel good project. It's looks good and it helps.
 
  #7  
Old 04-30-2016, 09:51 AM
Registered User
Join Date: Apr 2009
Location: NoVa
Posts: 4,386
Rep Power: 289
telum01 has a reputation beyond reputetelum01 has a reputation beyond reputetelum01 has a reputation beyond reputetelum01 has a reputation beyond reputetelum01 has a reputation beyond reputetelum01 has a reputation beyond reputetelum01 has a reputation beyond reputetelum01 has a reputation beyond reputetelum01 has a reputation beyond reputetelum01 has a reputation beyond reputetelum01 has a reputation beyond repute
I'd think it'd be a combination of a couple HP, and a touch more throttle response. Neither may even be perceptible to the driver, and only worthwhile if super-competitive. To get anything meaningful for most of us, you'd have to smooth flow and port match through the TB, intake manifold, and heads. Just my own speculation, though.
 

Last edited by telum01; 04-30-2016 at 09:55 AM.
  #8  
Old 04-30-2016, 02:22 PM
Registered User
Join Date: Nov 2009
Location: USA
Posts: 1,802
Rep Power: 91
007 Vantage is a splendid one to behold007 Vantage is a splendid one to behold007 Vantage is a splendid one to behold007 Vantage is a splendid one to behold007 Vantage is a splendid one to behold007 Vantage is a splendid one to behold007 Vantage is a splendid one to behold007 Vantage is a splendid one to behold
Just from smoothing out the transition you should not get 10hpm. That dyno variability could be from weather alone, without back to back on same day it's hard to compare.

Now if you bore out the entire throttle plate and remove half of the half shafts and gain a good 4-6mm then yes you can pick up a good 10-15hp and much more throttle response. Unfortunately nobody really does that.

I wonder if aftermarket ford throttle bodies should work. Somebody should look into that
 
  #9  
Old 05-04-2016, 09:16 AM
Adrian928's Avatar
Registered User
Join Date: May 2016
Location: Vermont
Posts: 27
Rep Power: 5
Adrian928 is on a distinguished road
Being on the outside looking in on this topic, I can add something as the 928 also has a large TB. In speaking with a fellow PCA 928 owner, on this subject, he went into his goody bag and gave me a polyurethane $10 JC Whitney velocity stack which had been cut down & the lip shaved. I was instructed to insert it into the TB as the gentle angle & glossy poly would be more conducive to airflow.
Once installed I did in-fact notice smoother response from idle. No perceived HP increase, just smoother throttle response. After my next service, it mysteriously disappeared. Moving on...
 
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Johnny Mo
Cayenne 958
10
04-28-2016 01:47 PM
DSCOFF
Automotive Parts & Accessories For Sale/Wanted
0
04-25-2016 07:30 PM
pwdrhound
996 Turbo / GT2
13
04-24-2016 08:41 PM


Thread Tools
Search this Thread
Rate This Thread
Rate This Thread:
You have already rated this thread Rating: Thread Rating: 0 votes,  average.

Quick Reply: More HP what found


Contact Us - About Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.