[Umbriel]

Originally Posted by oldman

I don't see how this is possible (stock engine???) on a 4.5 (upper) pulley my D1X makes 7 PSI at 6800 RPM, maybe 8 PSI at 7100 RPM. built engine stage 1 cam.

With a 4.0 pulley it is about 12 PSI at 6600 RPM same engine. Both with the procharger standard lower pulley.

I mean it is only at 2/3 speed with a 4.5 pulley (I did the cals several times you have to search).

stock damper. I would be worried that you add on crank pulley may not fit aftermarket dampers. (Procharger would know). I assume you have the old style kit that has a separate crank pulley. If not Yeah, I would assume an UD crank pulley would work.

I'm assuming it's because it is the larger F1 head unit? Not sure but I completely trust my tuner with what he says is going on, he's been tuning for 20 years. All of it really doesn't matter now because I purchased a Procharger intake with bungs for port injection and a secondary port injection system good for 1400 rwhp and I am about to purchase a forged short block and just turn it up.

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[Umbriel]

I asked for 7-9 pounds of boost when I bought it and Procharger said it would probably make more because of the head unit.

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[oldman]

Oh right F1.. LOL, heck the thing is still at "idle"...... f1 max is 70K and the f1a is 74K, heck you might be at um 2/3 speed maybe.. LOL.... my D1 is "only" 62K, actually I have to be a little careful with 3.65 ish pulleys and above 7 K shifts...

I would not risk the valves, if you are doing what I'm doing I would go pro flow extreme for the intake and Inconel for the exhaust now... One valve failure can ruin your whole day. I got "lucky" with my lifter as it only took out the cam, it could have been MUCH worst. Glad I put that HUGE magnet glued to the bottom of my pan, cause all the needle bearings were there like bees around the hive.....

[Umbriel]

Originally Posted by oldman

Oh right F1.. LOL, heck the thing is still at "idle"...... f1 max is 70K and the f1a is 74K, heck you might be at um 2/3 speed maybe.. LOL.... my D1 is "only" 62K, actually I have to be a little careful with 3.65 ish pulleys and above 7 K shifts...

I would not risk the valves, if you are doing what I'm doing I would go pro flow extreme for the intake and Inconel for the exhaust now... One valve failure can ruin your whole day. I got "lucky" with my lifter as it only took out the cam, it could have been MUCH worst. Glad I put that HUGE magnet glued to the bottom of my pan, cause all the needle bearings were there like bees around the hive.....

Yeah that is scaring me honestly and your the reason I want to put different lifters in it. My head unit is an F-1A.

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