throttle body upgrade?
03-15-2009, 07:33 AM
#11
2nd Gear Member
Join Date: Feb 2008
Location: New Jersey
Posts: 384
no problem, i was told that by a member on here when i was looking to upgrade my throttle body, the reason i threw in the "might" is because if im wrong by giving advice that was given to me, im sure that somebody on here was going to correct me and/or the statement.
03-15-2009, 08:44 AM
#12
5th Gear Member
Join Date: Jan 2006
Location: Puerto Rico
Posts: 3,926
75 will be too large for your application, there's not any power difference between 70mm and 75mm peak hp wise, but 75 will lag down low, and you'll likely loose some torque. For a stock engine 65mm or 70mm will be just fine, but serriously, for the cost of a TB, you can put a modest down payment down on an intake manifold kit, or buy a used GT-40 intake and gain much more power than the TB will yield.
How does it affect torque down low?
I agree with the replacement of one single component expecting huge gains in performance is not the correct approach, likewise the "bigger TB = "torque loss for a 302" is not correct though, or why do 287 cid SUV engines use stepped 65-68mm TB's OEM?.... or 238 cid V8 engines in luxury car setups use a tapered 83-70mm TB OEM? .... I also had to work two "after the fact" cases where the owners had already bought a 80mm TB, one was an '86 SD system with an AOD.... it gained zero HP but it produced them faster.
03-15-2009, 12:08 PM
#13
1st Gear Member
Thread Starter
Join Date: Dec 2008
Location: Washington
Posts: 56
joel that tb on the gt40 head looks spectacular. ok so i'm pretty sure if i were to upgrade the tb i'd go for the 70mm, i've hear that it buts up really good to the cai which i have on, and i don't think it would be the only thing i'll do to my engine, but seems like its something i could do before i drop the engine and go for the full build. curious, it seems like alot of fox owners go for the gt40 head, is there a particular reason for this? does it add more power than lets say a cobra head or the bbk ssi head?
03-15-2009, 11:50 PM
#14
3rd Gear Member
Join Date: Feb 2008
Location: Florida
Posts: 836
Nope.... just make sure the TB and intake plenum bore are matched. Check these before and after pics of a 75mm on a GT40 intake.
....can't remember his name....
03-16-2009, 01:30 PM
#17
1st Gear Member
Thread Starter
Join Date: Dec 2008
Location: Washington
Posts: 56
so besides having very nice tb and intake joel, why do so many fox owners use gt40 heads? are they really that good? or is price just right? what makes them different from say bbk ssi intake or a cobra 5.0 intake?
03-16-2009, 01:43 PM
#18
6th Gear Member
Join Date: Feb 2005
Location: KY
Posts: 13,396
