Hi guys!

What's biggest difference between those superchargers? Dimension are quite same. Is it only that D-1 has bigger step-up ratio or is there something "better" inside? Differences on impreller?

I'm just thinking to upgrade my P600B...

Teme

 

Try: www.procharger.com/models.shtml

case is different with different bolt pattern. Gears are different. It's self contained. Impeller different.... I saw on their site where they offer quite gear sets now...you might want to ask for the helicut gears unless you like loud.

 

Everything is different between these two head units. If you want additional power later, go with the D series blowers. The D1 is externally lubricated, as is the P-600B. They use completely different mounts as well. And I have yet to hear a P-600B that is quiet; they are all whiney...

 

That was the chart what I was looking. And from my installation instructions I saw that bracket is different and supercharger itself is also different (very bad picture).

Mine is REALLY noisy. Have been always. Sounds almost like bearing broken alternator.

It will fit under hood without problems? Belt slippage should be smaller issue than with p600b because bigger pulley or not? Have you found any photos about D-1 installation to C4?

 

What specifics would you like?




That is a R-series with a custom bracket and producing just shy of 30 psi (probably 30+ on a cold day; like today).

 

That looks nice setup. I was just wondering is it bigger than P600B and how much, but it looks that it will fit well under the hood. If you have more pictures about that installation you can send it to my email. teme_76(@)hotmail.com

 

The D-series blower is physically larger than the P-600B, even though the physical dimensions do not show that based on specs. When you go to mount a D1 vs an old P-600B, it is just physically larger (mainly due to the trans design).

I am not certain as to what year Vette you are working with, but the D1 should work on any early C4 application.
Aaron

 

Good to know. I have -89 coupe.

It seems that almost everybody has P600B or P-1SC and that's why these questions.

Thanks!

 

I have done a lot of SC installs on different generation Vettes. I will say that when I have the choice, I will always select the engine oil fed SC over the self contained units (i.e. D1 vs D1SC, or P1 vs P1SC). I like the fact that the engine oil is always pulling heat from the blower trans. The self-contained units use ~6 oz of fluid, which does not allow much heat capacity reserve.

A D1 will go right on the '89, and offer room to grow.
Aaron

 

Like you, I have a P600B blower.

I called procharger and asked them what the differences were.

They told me the newer models are much quieter (which can be good or bad), and that the boost is 'peakier'. John? told me procharger p600b makes more average boost, but not as much peak boost.

As for brackets, Im actually amazed how dinky the newer procharger brackets look compared to the p600b bracket.

what are your engine goals? 350? or bigger? There are a lot of very happy people with p600b. Im also told its extremely reliable.

If I was to buy new, yeah, Id get a d-1. but you have what you have.

do not go with the self-contained models. I agree totally on that. they arent bad or anything, just oil from the pan is better, for cooling reasons.

what I need to do next is convert it to 8 rib

 

I do not agree that the P-600B will produce more average boost. The centrifugal S/C's produce boost linearly based on engine RPM. Each head unit has a given SUR (P600B - 3.05 vs D1 - 4.44) which allows the unit to build boost. Assuming both blowers are shived to reach the same MIS, the volute and impeller are the only determinants as to which is going to produce more boost. The P600B will be much more prone to belt-slip due to the SUR, but there are steps that can be taken to minimize the belt slip.

I have not purchased an ATI bracket for a C4 in years, as I make my own. But, when I was buying the ATI brackets, the P1 and D1 brackets were decent and certainly not anything less than what was supplied with the P600B. Maybe their design has changed?

I agree. The ultimate goals for the engine should help decide which head unit the OP should pursue.

Have you done the mods to the P600B bracket. What size driven shive are you running? If you are running a 2.25" or a 2.1", you will loose boost. I have found that the minimum driven shive diameter that can be run with a 3.05 SUR (assuming you will twist to 5000+ RPM is 2.4". There are recommendations that I can suggest for the P600B that will allow you to push boost to 12-14 psi (if you are so inclined).

 

I bought that P600B only because I need that carb paper. Now I have mention about supercharger on registration certificate, so I can change it.

You're right that this model is still enought to me, but like AKS said, I like idea that I have "reserve" on it. My future goal is something between 500...600. More is better.

My current project is to ditch original ECM and FMU. So I'm more like making plans for the future. But thanks about these informations guys!