LS1 throttle body???

[FirebirdGT]

<blockquote>quote:</font><hr>Originally posted by Fin:


I'm in line yours & Dee's type of thinking. I'd like to see tests run on the different MAF/TB's, both P&P & not, to see what the differences are, if any, on a stock car & on a heads/cam car. There's no proof anywhere that says the MAF/TB is a restriction, everyone assumes since it's 'stock', it's not good enough.<hr></blockquote>


The "stock" 3800 TB is HUGE. You all should read the discussion in the Technical Database. And one of the most important items which has not been mentioned is throttle control. A large throttle plate with respect to flow will degrade throttle control. Do you all drive at WOT?

[Backfire]

<blockquote>quote:</font><hr> And one of the most important items which has not been mentioned is throttle control. A large throttle plate with respect to flow will degrade throttle control. <hr></blockquote>

This is an excellent point. On a custom built intake I worked on, a great example of matching a TB to the rest of the engine was seen. We had to run a 20mm diameter restrictor for the competition the vehicle participated in, so obviously that was the primary restriction in intake. The TB we chose was too large, and the intake flow would reach maximum (choked) flow through the restrictor with the TB open only 45%. Everything after that was pointless and made no difference in air flow into the engine, and everything before 45% was very touchy. This is obviously an extreme case, but shows how a giant TB, with respect to the rest of the engine, isn't always a good thing. Some decent flow bench testing might be a good way to evaluate the TB vs the engine demands.

[ May 21, 2002: Message edited by: Backfire ]</p>