Quote:
Originally Posted by joetile
Patrick, Just a couple of thoughts on the headers issue. I believe that you will nt be happy with long tube headers for a couple of reasons. First, on emission equipped trucks, I believe that the catalytic converter has to be relatively close to the manifolds ( headers) in order to bet warm enough to function. The cat is probably the biggest restriction in the exhaust system, so the long tube headers will probably lose most of their effectiveness! The whole tune of the engine is tied into having a certain amount of backpressure in the system.
2nd. On Ford V-8, the O'2 sensors wont work right either. Not sure about Toyota's since this is my first V8 toyota, but most emission systems work similarly
3rd, Long tube headers are a major pain to install in some vehicles.
I have had a lot of very High performance cars in past years, 11 second cars & 118 mph in qtr.
I learned thru trial and error that unless the whole engine is set up for high RPM, you usually lose power and torque if the exhaust is to big for the heads, cam and intake. Just my 2 cents worth, but I spent a lot of time and money making my one of my last trucks go slower with Hooker full length headers and dual FlowMasters! ( but a lot louder) Joe
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I agree with a lot of what you said. I'm not saying LT's are the absolute best for every application, but switching the factory manifolds on this Tundra (which are far superior to those found on most trucks) for a set of shorty headers is not really worth the money.
I've spent a lot of money on making cars go fast too. Unfortunately, I wasted a lot of money of shorties and mids. On my Z28, the best mod I ever did (besides dyno tuning) was putting on a set of LT's with the stock cam, heads, etc. The scavenging effect of a tuned LT is far superior to any mid or shorty header design.
Considering the motor we are discussing is over 340 cubic inches, I can't see how this truck would not benefit from a longtube header. As I'm sure you know, the longer the header, the more low to mid torque you have. A shorty header provides more high rpm power than a stock manifold. However, a mid or longtube is better set to create low to mid rpm power.
On my LS1 Z28, I gained 22 rwhp and 31 ft/lbs of torque, all below the stock redline of 5200 rpm's. That's right where I wanted it.
I agree, LT's are a PITA. And I think the biggest thing holding them back will be the programming needed to turn off the rear O2 sensors. Otherwise, companies like Pacesetter, Bassani, Hooker and Edelbrock will all offer a quality, low to mid rpm power creating longtube header in the future for this truck.
For those that want to spend $700 for 3 rwhp at 5,000 rpm's on a shorty header, I wish them luck. I'd rather wait a bit and gain 15-20 rwhp with a longtube (damn the emissions gods! hehehe).
A while back, I heard rumors of Edge producing a programmer for this truck. Any updates?
for a performance, programmable chip for the 5.7 engine. Still haven't seen anything to date, and this engine has been out a while.
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