hi,I just bought a new d1r procharger for my vette and want to rebuild it and put in some ceramic bearings .my only question is on the d1r in the middle of the impeller it has like a black bullet shaped piece ,does anyone know how you remove that ? i need to remove it because under it is the bolt that hold the impeller on i rebuilt my d1 last year but the d1 does not have the ''bullet''like the d1r .any help would be greatly appreciated ..thanks in advance

 

you might what to throw that question out on the c-5 forum..........

 

I have the "black bullet" on the nose of mine as well. I have never had to remove the nose cone, so no help on this end. Unfortunately, I believe no one on the C5 runs the D1R, as they have to use the RR unit, which leads you to the F1R series.

I would see if I could get answers from ProCharger.
Aaron

 

Hi Aaron, I figured out how to remove the bullet you just pry it out with a screw driver and it is made out of plastic .I found all the ceramic bearings that are way better then the regular steel ones ati uses .the ones ati uses are good for 40,000 rpm while ceramic bearings are rated at over 100,000rpm . Ati uses 40k rpm bearings when the max impeller speed for the d1r is 58k rpm and 65k for the d1 .I guess that's how they keep you coming back for repairs .

 

I have had no bearing issues on any of the many installs I have done. I feel that if ATI was installing linferior design bearings in their head units which are rated lower than they are designed to spin, they would have a huge warranty issue. Economics would tell you that this path would not be commercially prudent.

ATI states that their head units have a 10% minimum over design built in, which would mean that their bearings are capable of >70K RPM.

Best of luck in your bearing replacement.
Aaron

 

Hi Aaron,I checked the bearing manufactures web sites about the bearings and one of the bearings has a 40,000rpm max rpm and the other is 44,000 rpm that's no where near max impeller rpm of the d1r let alone the d1 that has a 65,000 max rpm .I have heard of many prochargers taking out the bearings especially the self contained units.I still think the prochargers are the best blowers you can buy but i think ati is full of crap if they say they build 10% minimum over run into there s/c .btw what size s/c pulley are you running on your d1r and the crank pulley size ? also are you anywhere near the max rpm of the s/c and how much boost does it make? i compared the d1r impeller to my d1 impeller and the d1r is frigging huge.

 

I had not seen your last post.

On my '87 with the D1R, I am running a 7.2" diameter drive shive (crank), with a 3.4" driven shive (blower). At 6200RPM engine, the calculated blower speed is ~58.3K. That is pretty much at MIS. I guess my bearings are just fine with 58K, and as i know I sometimes run to 6350, maybe they do have that 10% built in.

Boost is a relative term. I am probably getting less boost than others might due to the large heads, large cam, and my intake/TB. I have minimal restriction in the intake tract. I am typically right at 25 psi, sometimes touching 26 psi (depends on ambiant air temp). One time I logged and saw just over 28, but that has not been repeated.

I am not sure what amount of boost you will see with yours, as I do not recall your intake components, nor cam. Details? I/C?
Aaron

 

look at [url]www.superchargerhelp.com

 

hi Aaron ,I just seen now you replied to this post .your friggin crazy 25+ lbs of boost that's just insane ,and that's with free flowing engine .On my new engine I'm using a gmpp cnc bowtie block forged internals 383cui with 8.5 comp and the new afr 210 eliminator heads and miniram intake 58mm t/b .the cam is a comp roller 236int/248exh duration and 554int/576exh valve lift and 114 lobe sep .hooker 1 3/4 headers and dual 3 inch exhaust .my crank pulley is a 72 tooth and the sprag pulley i made for the s/c is a 38 tooth pulley and the dual wheel well inter coolers .I was going to ask you,say if you had a d1 that made 15lbs of boost with a 40 tooth pulley and you installed the d1r with the same 40 tooth pulley how much more boost will the d1r make over the d1? is it a huge difference ? comparing the impeller and volute from the d1r over the d1 it is a huge difference .I'm hoping to break into the high 14 sec range with this new set up .btw when i was 16 i had a 83 z-28 with a ho 305 that made 500+h.p and thats no

 

I have a bit of difficulty with answering this question, as I moved to a D1R while changing the engine combo. It is not exactly an apples to apples comparison. Below is the best I can do.

old combo
Fully forged bottom end, but with SRP pistons, Crower rods, GM block (2-bolt)
s.c.r. - 9.5:1
blower - ProCharger D1
Heads - AFR215CPs
Cam - CC HR ~228/236@0.050", ~0.600" lift
Intake - MRII w/ 58MM TB
IC - 4 row custom FMIC Spearco
Boost - 9.5 psi @5800, 12 psi @ 6300

intermediate combo
Fully forged bottom end, but with JE custom, Oliver Billet rods, Callies S/L, GM block (splayed 4 bolt)
TBs.c.r. - 9.2:1
blower - ProCharger D1R
Heads - AFR215CPs
Cam - CC SR ~248/254@0.050", ~0.670" lift
Intake - MRII w/ 58MM TB
IC - 4 row custom FMIC Spearco
Boost - 9.5 psi @5700, 12.0 psi @ 6400

intermediate combo II
same fully forged bottom end
blower - ProCharger D1R
Heads - AFR220CPs
Cam - CC SR ~248/254@0.050", ~0.670" lift (same)
Intake - C4SP w/MB
IC - 4 row custom FMIC Spearco
Boost - 8.5 psi @5500, 10.8 psi @ 6400

current combo
same fully forged bottom end
blower - ProCharger D1R
Heads - AFR220CPs
Cam - CC SR ~248/254@0.050", ~0.670" lift (same)
Intake - C4SP w/MB
IC - none; EtOH injection
Boost - 9 psi @3400, 18 psi @ 4500, 24 psi @ 6050, have seen 26+ (once 28)

You have probably seen from my other posts that I tend to get "wound up" by exageration, but I will let this fly as I know you are probably tossing this comment in that ire. However, I do think you are highly likely to acheive your 14 sec goal.

Best of luck in breaking into the 14s.
Aaron