what have you done with stock FI and performance mods?, quest for a killer D-jet 2056cc motor Options

[realred914]

what are the trick mods for performance power when building a D-jet motor . it is a tired 2 liter that will be getting a big bore 2056 piston kit.

what are recommendations for valves, porting compresion , etc....

will be a driver car 91 octane gas, , have SS heater exchanger, and I do want heat.

what can be done during rebuild to beef up the power????

[Cap'n Krusty]

Over the last 37 (almost 38!) years I've used a number of camshafts that were advertised as D-jet compatible. None were. (I've not tried Jake's, but I respect his knowledge and the hands on practical research he's done to ensure his WILL work as advertised.) Many (most?) of the others have been designed by engineers who haven't used them in an emissions controlled environment, nor do they appear to have had any practical experience in driveability. The system expects to see a certain set of vacuum characteristics that come from the stock camshaft profile, and few, if any, offerings of the big names in camshaft grinding provide those characteristics. Web Cam doesn't, Norris didn't, Isky, the same, nor any of the others I've tried. They all run really fat at idle, have a flat spot you could play pool on, and are otherwise a PITA to tune and to drive.

Consider that, please, before you pick a cam. They're a REAL PITA to replace once you've decided I might just be right.

The Cap'n

[Jake Raby]

Over the last 37 (almost 38!) years I've used a number of camshafts that were advertised as D-jet compatible. None were. (I've not tried Jake's, but I respect his knowledge and the hands on practical research he's done to ensure his WILL work as advertised.) Many (most?) of the others have been designed by engineers who haven't used them in an emissions controlled environment, nor do they appear to have had any practical experience in driveability. The system expects to see a certain set of vacuum characteristics that come from the stock camshaft profile, and few, if any, offerings of the big names in camshaft grinding provide those characteristics. Web Cam doesn't, Norris didn't, Isky, the same, nor any of the others I've tried. They all run really fat at idle, have a flat spot you could play pool on, and are otherwise a PITA to tune and to drive.

Consider that, please, before you pick a cam. They're a REAL PITA to replace once you've decided I might just be right.

The Cap'n

I agree with The Cap'n... I tried all the off the shelf offerings with no success until I developed the 9550, 9560 and 9590 grinds back in 1999. They were all developed to have a very conservative opening event to enhance the vaccum signature that the MPS sees. This is VERY critical to proper operation.

I tried over ten variations of the first version which is based from the Web 73 grind, the lobe separation and exhaust profile are altered from that base grind.

I've sold about 1500 of these camshafts, about 60 of those were sold this year. Out of all those I've had two complaints, both from people who misconfigured the remainder of their engine around the 9550 camshaft. Thats the reason why I am so critical of the combination that my camshaft will be used in conjunction with.

Cam grinders aren't engine builders, they have no idea how their product couples to different head configurations, induction systems or exhaust systems. I tell the cam grinder what to grind, I don't ask them to recommend what I need. They are about the worst person to make the selection. I wonder how many of them drove a TIV powered car to work today?