Sup guys, havent posted in this section in a little while. Since I've done my 2J manifold conversion on my 7M alot of people have asked me countless questions as far as how to go about doing the upgrade and how to overcome certain problems. I hope this thread gets made into a sticky because its a mod that should be recognized for what it is, alot of extra hps out of something fairly simple. Below is a picture of the 2J manifold installed on my MKIII, for those who dont know of what Im talking about...
To first cut to the chase and give you guys a better idea asto what kind of power difference Im talking about...My car dynoed at 259.7hp and 279 ft tq on STOCK turbo and STOCK boost. My car was the " dirty 90+, that the PHR guy was making fun of" as someone put it. The mods that were done to the car at the time of the dyno were the following:
K & N Intake
3" Cat back, 3" down pipe along with a stock gutted cat
And last but not least.....MKIV Intake manifold custom welded to fit my 7M with an NPR intercooler
The fuel delivery system, AFM, Injectors, and the Engine internals were ALL BONE STOCK. The car doesnt have any sort of aftermarket electronics in it aswell, no AVCR, no SAFC, and FCD, the car does not even contain an aftermarket boost gauge to give you an idea of how stock this car is.
Anyways....this is the question i've gotten asked alot, I've responded to many with as much knowledge as I have regarding this upgrade but sometimes writing a two page email or a pm to someone only to find out that they're PM box was full and every thing you just wrote was a waste of time because hitting the back button erases everything just aggravates me. The question is "How did you over come the TPS issue?" and the answer is to say is pretty simple but to do is sort of complicated.
To those of you who dont know what that question is referring to, the MKIV TPS puts out the wrong resistance for our injectors and just slapping on the MKIII TPS is not feasible because the 7M throttle body opens in the opposite direction compared to the the MKIV throttle body, thus rendering both TPS's useless.
There are two ways you can go about overcomming that issue. The first is to REVERSE the actuall MKIV throttle butterfly and change the direction the flap opens to where it opens COUNTER clockwise, the same direction our stock 7M throttle body opens. Doing so will allow you to mount the stock 7M TPS onto the same location of the MKIV TPS. Doing this will get rid of your TPS issue but leaves you with another issue....reversing the butterfly creates a gash which is caused by the butterfly not being flush when the throttle is closed all the way. This can be over come by simply having excess aluminum welded in and shaved out to create a new border for the butterfly getting rid of the gash, or something a little more temporary like JB welding and molding the edges to work. Leaving the gash there will cause the car to idle at 6000 RPM.
The second way to go about doing this is what I will attempt next, its fairly simple and a much more cleaner install. You can get the MKIV TPS and change out the resisntance being output by the TPS itself to match the 7M resistance. These resistance will go on right before the harness is attatched to the TPS (so in a sense in the middle of the TPS and the harness jack). I've been told that these resistance can be had from a local radio shack but will let you guys know when I try and successfully finish that conversion.
Another problem that you guys will encounter is that the stock FPR gets in the way of the MKIV TB, in which case you will need to either go with aftermarket FPR or go to home depo and purchase a few copper conjunctions and lines totalling no more then twenty bucks to just simply move the FPR about six inches to the right where it clears the TB.
Hope this answers any questions you guys might have had and removed any doubts about the power with the actuall figures and definitely hope to see more 2J converted 7M's running around, as of right now there's only a hand full of peopl with these.
Kruso
