RJM GTR Intake Lower Manifold...oh yes!

juicinjake

let me clear one thing up right now, there is absolutely no bias here at all whatsoever... remember i bought aam's manifold too (and am also sponsored by them for their TT kit)... and have a host of other modified stock manifolds to test. my interest is information/data generation and learning, not just for myself, but for all of us. my goal is to figure out what sort of applications each of these manifolds work better on. the vq web forums are polluted with negativity, misinformation and overall a terrible mindset with regards to mods in general, particularly with regards to intake manifolds. they expect parts to make power. thats just crazy to me, because thats not how it works. combinations of parts make power, when tuned properly. some combinations of parts are better than other combinations of parts, for a given goal. often times i see a question asked to the effect of "whats the best intake manifold for a vhr?" thats the kind of question that shouldnt ever be asked. the question people need to be asking is "what is the best intake manifold for my existing combination with respect to my goals?" a 10k rpm vq might win a lot of drag races, but will probably suck to drive around town and operate at low (engine) speeds. the intake manifold that belongs on the 10k motor would likely not make good power on a lower rpm street car, and vise versa. this is the seemingly chronic sickness that i am attempting to cure in this community... by teaching people to build effective combinations targeted at their intended use and performance goals. this is what the domestic guys do. now, the aam is a shorter runner manifold, much like the factory unit... whereas the stock gtr upper (not rjms product) combined with rjm's lower produces a MUCH longer runner. these should have VERY different performance characteristics. i tested long and short runner stuff on DE's for years before moving on to this platform. runner length has a very substantial effect on the powerband. i honestly believe runner length and plenum volume are going to be the big variables in these tests. with regards to my methods... i will test all these manifolds with stock cams, and then pull the motor, cam the car, and do it all again. i am also building a 4.2 for one of my customers currently that i will test both manifolds on. by changing displacement, rpm, cams, and things of that sort, many different combinations are developed... and i will present my data as such. there will be no "this manifold is better than this manifold period" sort of comments from me... thats pure ignorance. what you will see, however, is a comparison of powerbands and combinations. that might lead into some crude calculus being performed on the dyno curves with respect to gearing, ie tractives...

now, back to the bias thing... im biased towards the Z/G COMMUNITY. this is my fam. this is the people that are like me and get me. i am doing what im doing bc the community needs this knowledge, they need a new mindset... and need to get away from "how much power will this part give me?" sorta stuff... they need to get away from negativity and skepticism... two things that have never, ever won a race in all of automotive history...