Welcome to Bimmerfest -- The #1 Online Community for BMW related information! Please enjoy the discussion forums below and share your experiences with the 200,000 current, new and past BMW owners. The forums are broken out by car model and into other special interest sections such as BMW European Delivery and a special forum to voice your questions to the many BMW dealers on the site to assist our members!

Please follow the links below to help get you started!

Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > Z Series > E36/7 Z3 (1996-2002)

E36/7 Z3 (1996-2002)
E36/7 Z3 Roadster, Z3 coupe, Z3 M Roadster and Z3 M Coupe talk with our gurus here.

Reply
 
Thread Tools Display Modes
  #1  
Old 09-10-2013, 01:28 PM
tohbi tohbi is offline
Officially Welcomed to the 'Fest
Location: arizona
 
Join Date: Aug 2011
Posts: 387
Mein Auto: z3 '97 atlanta blue 2.8
z3 throttle body

what do y'all know about aftermarket throttle bodies from riot racing? price isn't bad if the performance increase is what they say it is.

http://www.westcoastriots.com/obd2.h...CT_ID=18601765

link for all: http://www.westcoastriots.com/

Last edited by tohbi; 09-10-2013 at 01:40 PM.
Reply With Quote
Advertisement
  #2  
Old 09-17-2013, 10:38 AM
tohbi tohbi is offline
Officially Welcomed to the 'Fest
Location: arizona
 
Join Date: Aug 2011
Posts: 387
Mein Auto: z3 '97 atlanta blue 2.8
what, no one has replaced a throttle body? it's a common way to improve fuel flow on many cars.
Reply With Quote
  #3  
Old 09-17-2013, 02:15 PM
Blacklane Blacklane is offline
Officially Welcomed to the 'Fest
Location: Springfield, Ohio, USA
 
Join Date: Jun 2011
Posts: 1,082
Mein Auto: 1998 Z3 Roadster
The general consensus here is that the BMW engineers did a pretty good job of balancing the system. A bigger throttle body can only help if it is the most restrictive part. It is not. It is one of many parts, such as MAF. manifold, valves, cams, ports, headers, exhaust pipes, cats, and mufflers. The only way to add any meaningful horsepower to these engines is to add forced induction.
If you do a search here on Performance Mods, you'll generally find that sentiment from others who have tried many things.
I believe there is absolutely no way a bigger throttle body (with 7% larger bore) can increase air flow by 11% and WHP by 8% as claimed. There just isn't that much margin left in the system.
That being said, I have never heard of anyone replacing just their throttle body. Perhaps you would be willing to buy one, install it, and get it tested on a dyno for us. Post your results.

Last edited by Blacklane; 09-17-2013 at 02:17 PM.
Reply With Quote
  #4  
Old 09-18-2013, 01:53 PM
tohbi tohbi is offline
Officially Welcomed to the 'Fest
Location: arizona
 
Join Date: Aug 2011
Posts: 387
Mein Auto: z3 '97 atlanta blue 2.8
Quote:
Originally Posted by Blacklane View Post
A bigger throttle body can only help if it is the most restrictive part.
i understand what you're saying but any improvement in airflow is, well, an improvement. while this throttle body claims to be 4mm wider, it also has a refined butterfly. it's common for people to take an existing throttle body and knife-edge the butterfly to reduce turbulence thereby increasing air velocity. polishing the throttle body walls and matching mating surfaces also are common.

the dyno graph that claims almost 8hp increase also had a dinian chip and track pipes on the car. riot racing says most improvement is in the 3-5hp range. they show a couple other dyno tests that are in the 4 and 5hp range [if i understood them correctly].

but there's more than horsepower to consider. quicker, smoother throttle responses are others. moreover, they claim no loss of torque, which seems sensible to me. at $250 [doing the change yourself] it seems a logical expense considering how much some of us spend on exhaust systems, et al.

here's a thread: http://www.bimmerfest.com/forums/sho...d.php?t=403389

Last edited by tohbi; 09-18-2013 at 03:00 PM.
Reply With Quote
  #5  
Old 09-18-2013, 07:07 PM
Christian's Avatar
Christian Christian is offline
Project No Budget 1.9
Location: West Palm Beach, FL
 
Join Date: Apr 2002
Posts: 97
Send a message via AIM to Christian
Mein Auto: 1997 Z3 1.9
Quote:
Originally Posted by tohbi View Post
what do y'all know about aftermarket throttle bodies from riot racing?
I don't know anything about that particular supplier, but I had the original TB on my supercharged 1.9 bored by MaxBore (http://www.maxbore.com). If I recall the cost was only about $80 and the service took a few days. It looks like their current pricing is up to $99.00. At the prices they charge I don't see how you can go wrong with MaxBore.
__________________

'97 Boston Green 1.9
Reply With Quote
  #6  
Old 09-28-2013, 03:02 PM
tohbi tohbi is offline
Officially Welcomed to the 'Fest
Location: arizona
 
Join Date: Aug 2011
Posts: 387
Mein Auto: z3 '97 atlanta blue 2.8
what did boring do for performance? did you have the ports matched too? thx
Reply With Quote
  #7  
Old 09-29-2013, 07:36 AM
Z3Papa Z3Papa is offline
Officially Welcomed to the 'Fest
Location: Bloomington
 
Join Date: Dec 2004
Posts: 609
Mein Auto: 2002 Z3 3.0
Dinan used to have big bore throttle bodies for your car and others. It's been a while since I was on their site but the performance bump wasn't huge.
__________________
SS braces, AST 4200's coilovers, Vorshlag camber plates, GC RSM, H&R Front sway, Conforti CAI, Magnaflow exhaust, Recaro seats, and Apex ARC-8 with RS3's and Style 32's with Pilot SS for autocross
Reply With Quote
Reply

Bookmarks


Forum Navigation
Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > Z Series > E36/7 Z3 (1996-2002)
Today's Posts Search
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is On



Forum Jump


All times are GMT -7. The time now is 04:31 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
© 2001-2011 performanceIX, Inc. All Rights Reserved .: guidelines .:. privacy .:. terms