{"id":16928,"date":"2015-07-23T08:54:10","date_gmt":"2015-07-23T15:54:10","guid":{"rendered":"http:\/\/www.racingjunk.com\/news\/?p=16928"},"modified":"2016-05-26T11:04:46","modified_gmt":"2016-05-26T18:04:46","slug":"hard-parts-for-your-fuelie-part-ii","status":"publish","type":"post","link":"https:\/\/www.racingjunk.com\/news\/hard-parts-for-your-fuelie-part-ii\/","title":{"rendered":"Hard Parts For Your Fuelie Part II"},"content":{"rendered":"

\"throttle<\/a><\/p>\n

In the last segment<\/a> of Hard Parts For Your Fuelie, we took a detailed look at Holley’s modular Hi-Ram intake. \u00a0If you recall, the Hi-Ram is essentially a modern high tech tunnel ram arrangement that can accept carburetors or throttle bottle injectors. \u00a0There’s a special top available that allows you to use a lower profile air intake with a front mount throttle body. \u00a0Holley offers several different throttle bodies for this application – 90-mm, 35-mm, or 105-mm models. \u00a0In this article, we will take a look at each of these. The 105-mm job is available with either a straight bore or a \u00a0tapered bore (we’ll get to the differences down the page). \u00a0FYI, the various throttle body mandate a specific manifold top.<\/p>\n

For our purposes, we’ll zoom into the 105-mm jobs (with photos), but the 90-mm and 95-mm models are much the same. \u00a0The smaller billet Holly throttle bodies are all built with what Holley calls a “Low RPM Taper”. \u00a0That means that there is a tapered transition machined into the body that eliminates low speed (low RPM) drivability issues. \u00a0Essentially, tapered models offer more pedal to throttle travel at low engine speeds to improve drivability on street and similar applications. \u00a0As pointed out above, the 105-mm throttle bodies are available with a taper or with a straight bore. \u00a0Throttle bodies without tapers are maximized for “RACE ONLY” applications. \u00a0The actual throttle bores in all of Holley’s throttle bodies are larger compared to those found on competitor’s throttle bodies, too.<\/p>\n

Holley uses a unique TPS “clocker” that allows the TPS to be rotated back into the ECU’s required idle voltage range. \u00a0As a result, modified engines no longer suffer from problems related to TPS voltage. \u00a0A PCV passage valve is included in the throttle body. \u00a0This means that in forced induction applications, there’s no need to physically block the PCV port. \u00a0Additionally, the PCV port can be rotated if there is a need for a different (than stock) orientation.<\/p>\n

Holley also fits the throttle body with a bleed screw. \u00a0Now, assuming that an engine has a very long duration, high overlap camshaft (with low manifold vacuum), a situation may exist where it is difficult to tune a poor idle by way of the ECU. \u00a0With Holley’s throttle bodies, the included idle bleed is an adjustable passage around the throttle blade to increase idle performance, if needed. \u00a0The bleed screw allows idle adjustment without affecting blade position and TPS output voltages at idle.<\/p>\n

The actual body is machined from billet aluminum. \u00a0You’ll note that the throttle plate is “slabbed” (heavily profiled) to improve airflow. \u00a0The body is black anodized too. \u00a0This means that it is resistant to corrosion.<\/p>\n

All of Holley’s premium throttle bodies are engineered to work with cable drives. \u00a0All have a cruise control provision as well. \u00a0In terms of applications, Holley points out that the throttle bodies fit the following intake manifolds: Stock LS2, Stock LS3, Stock LS7, Holley LS Mid-Rise, Holley Hi-Ram (85 and 105-mm tops), Fast\u2122 LSX, Edelbrock Pro-Flo XT using 4 bolt TBs as well as most other 90 through 95-mm LS intakes using 4 bolt throttle bodies.<\/p>\n

Finally, Holley offers a throttle cable bracket for the big 95-mm and 105-mm throttle bodies used on Hi-Ram and Mid-Rise intake manifolds. \u00a0This bracket has an allowance for throttle pedal adjustment or the addition of a nitrous plate. \u00a0It works with throttle cables from 1998-02 5.7L Camaro and Firebird (GM Part Number 12563339) or aftermarket versions patterned after the GM component. \u00a0You can also fit a cruise control cable from the same applications (various GM part numbers).<\/p>\n

For a closer look at the billet throttle body, check out the following photos:<\/p>\n

\"throttle<\/a>
Holley manufactures several different billet aluminum throttle bodies. This is their large 105-mm job with a special low RPM taper. This means it is very streetable. The text offers more information.<\/figcaption><\/figure>\n
\"throttle<\/a>
Looking at the throttle body head-on, you can see the large slapped throttle plate. It’s carefully contoured to ensure maximum flow.<\/figcaption><\/figure>\n
\"throttle<\/a>
Here’s a look at the backside of the throttle body. The basic configuration fits a wide range of intake systems, although in this particular case (105-mm), you’ll need a dedicated intake (top) to accept the large bore.<\/figcaption><\/figure>\n
\"throttle<\/a>
It might not look like much, but this bracket is important. It allows you to hook up the throttle body to a conventional production line GM cable. It also allows the installation of cruise control (cable) using factory parts.<\/figcaption><\/figure>\n","protected":false},"excerpt":{"rendered":"

We’re taking a closer look at Holley’s throttle bodies.<\/p>\n<\/div>","protected":false},"author":20,"featured_media":16930,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_jetpack_memberships_contains_paid_content":false,"footnotes":"","jetpack_publicize_message":"","jetpack_publicize_feature_enabled":true,"jetpack_social_post_already_shared":true,"jetpack_social_options":{"image_generator_settings":{"template":"highway","default_image_id":0,"font":"","enabled":false},"version":2}},"categories":[11,9],"tags":[4518,281,461,4517,321],"class_list":["post-16928","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-how-tos","category-tech-tips","tag-fuel-systems","tag-how-to","tag-tech-tips-2","tag-throttle-bodies","tag-wayne-scraba"],"jetpack_publicize_connections":[],"jetpack_featured_media_url":"https:\/\/www.racingjunk.com\/news\/wp-content\/uploads\/2015\/07\/Hard-1.11.jpg","jetpack_shortlink":"https:\/\/wp.me\/p42YSK-4p2","jetpack_sharing_enabled":true,"amp_enabled":true,"_links":{"self":[{"href":"https:\/\/www.racingjunk.com\/news\/wp-json\/wp\/v2\/posts\/16928","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.racingjunk.com\/news\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.racingjunk.com\/news\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.racingjunk.com\/news\/wp-json\/wp\/v2\/users\/20"}],"replies":[{"embeddable":true,"href":"https:\/\/www.racingjunk.com\/news\/wp-json\/wp\/v2\/comments?post=16928"}],"version-history":[{"count":6,"href":"https:\/\/www.racingjunk.com\/news\/wp-json\/wp\/v2\/posts\/16928\/revisions"}],"predecessor-version":[{"id":27515,"href":"https:\/\/www.racingjunk.com\/news\/wp-json\/wp\/v2\/posts\/16928\/revisions\/27515"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.racingjunk.com\/news\/wp-json\/wp\/v2\/media\/16930"}],"wp:attachment":[{"href":"https:\/\/www.racingjunk.com\/news\/wp-json\/wp\/v2\/media?parent=16928"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.racingjunk.com\/news\/wp-json\/wp\/v2\/categories?post=16928"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.racingjunk.com\/news\/wp-json\/wp\/v2\/tags?post=16928"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}