I currently building a low compression forged 370ci, iron block, H/C and d1sc, the c.r will be about 8.6.


Is 900whp achievable with the d1sc?

can i run 20+ psi with the d1? Procharger claim that the d1sc max boost is 32 psi

this set up is on 01 m6 ss.

 

depends on the displacement

 

He already said 370ci.^^^


I think 900rwhp will be very very hard with that CI and D1SC even with 20psi if you still didnt buy d1sc then go with F1A.

What H/C/I Are you running?? 20psi is hard to run without pushing water.

 

Oh why the low Compresstion???? I think 9:0 or 9:5 will be better for Procharged setup

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I have already buy the d1, the cam is custom blower cam,head is pateriot LQ9.

so what the pulley size so I can push the limit of the d1.

what kind of power should I expect on 20 psi ?

 

If you have good heads I doubt you will see 20 psi on a D1SC. Boost is simply a measure of backpressure, all you can do is max out the impeller RPM and see what you get. You'll need race gas, and even then I would say you'd make about 800 RWHP. You can spray a small shot of nitrous on it to get 900 RWHP, or get a bigger blower. I'd get some better heads with a thicker deck too.

 

Yeah I agree with Thicker deck heads (AFR, ETP, TFS)

 

Plain and simple, the d1sc will not do 900rwhp.

Upgrade into a f1a / f1c to achieve more airflow at less boost.

While the patriots are better then a non ported casting, they are not optimal for this kind of goal. A nice set of AFR or TFS heads are the ticket.

 

So what pulley size to max out the impeller RPM ?

 

Crank pulley dia / Blower Pulley dia * stepup ratio (d1sc 4.10) * engine rpm redline = blower speed. Advertised max rpm is 68k i believe.

To consistantly run this setup, you will need a spring loaded tensioner if you dont want to swap belts weekly (assuming daily driver).

An f1 unit will make the same hp with less strain, midrange might be a bit laggy on the f1 vs the d1sc.

 

I have almost the exact setup you are building...

On 10psi and the stock procharger intercooler I made 627rwhp

I have since maxed out my D1SC rpm (via custom 8" crank pulley) and am making about 5-6 more psi and added EPP's huge *** FMIC. Dont know what power will be but guessing 730-750rwhp. Thats all the steam the D1 has in her. Oh, I am runnning 9.0:1 compression. Hope this helps

 

750rwhp is about average for max impeller speed without any special engine mods such as custom heads and high compression.

We have seen 19psi on a 346 with max impeller, standard patriot heads and lpe gt2-3 , 720hp.

On 16psi on a 402 engine with ported 72cc heads about 9:1 it made 760rwhp when we ditched the heavy forged wheels for a set of bogarts.

 

I know it's an old thread but still valid info. You can touch 900rwhp with a d1sc if you're built right and know tuning. Made 856rwhp@16psi 3.4" pulley , 8" lower , forged 402ci 9:1 compression , 91oct + shitload of methanol (14gph + 12gph nozzles) , 20* timing (MBT) , 12.7:1 afr (yes , you read that right). No detonation at all, thank you meth. The bottleneck is now the a&a air bridge , which when swapped with a straight ram should yield a couple more lbs of boost. A higher compression setup would make even more power.

 

Seems pretty ragged edge to push the envelope further for the possibility of kissing the record of 900 on a D1SC. Most D1SC's maxed with good setups see 750 RWHP. If the power is the goal and you want it, it would be MUCH easier and a sure thing to just do the F1 series Procharger.

 

The reason for sticking with the d1sc and maxing it out is because it has the helical cut gearset option, which isnt available on any of the f-series prochargers. Mine is almost silent with the hood closed, whereas even the lowest model F1c(?) sounds like it's full of sand. You can even get ceramic bearings and lightened helical gears for the d1 from superchargerrebuilds, and pulleys smaller than 3.4" from 928motorsports. That will comfortably raise the max rpm of the blower significantly.

 

Be careful with the helical cut version.
I know someone that exploded one of those pushing it to max impeller speed with limited running time.

 

Are you spraying meth pre and post compressor?

 

I had an aftermarket impeller come apart at 62k rpm but haven't had the gears fail yet. It makes sense tho, the helical cut has less of a contact patch where the teeth meet up. They won't be able to handle quite as much load as the straight cut.

 

Spraying post compressor, on tube leading to throttle body. IAT sensor is between the nozzles and the TB, very important.

 

I think you can get the quiet gear box on the F1D???

Not sure how much more power that blower is good for over the d1sc though