CALL911

iTrader: (17)

Curious to see what kind of boost levels you guys are seeing with both the D1's and the D1SC's.

Jake@EPP

Seen 18psi here, 346 motor. On 400in motors usually 16 or so psi.

Keep in mind, we ended up using a +1in crank pulley to get the boost that high. So these d1sc's were maxed out.

CALL911

iTrader: (17)

I think 18#'s for the D1SC is the average from what I have seen. Mine maxes at 15#'s and is at its max impellor speed at 6500 RPM. I would like to see 18#'s, but even if I change the crank pulley, I feel I may just see 15#'s at a lower RPM, as then it would be maxed out at a lower RPM as well.

I more or less was just wondering if what everyone was getting both on their LT1 engine's and the LS1's. I agree that the bigger the cubic inches, the less potential boost most will see.

Jake@EPP

Time for a F1 series

CALL911

iTrader: (17)

I won't lie, I have thought about it, as the motor would easily take a maxed out F1, however I am pretty happy with my ability to hook up in 1st gear with 614 RWHP, and with an F1 (or even a few more pounds of boost on the D1SC for that matter) I have a feeling I wouldn't have the traction I do now.

Jimmy P

iTrader: (177)

My D1 was prety much maxed out on my 402 at 16.2lbs of boost.

cbra-klla

iTrader: (52)

how many lbs. do you think will i see on a 370ci, with stock 6.0 heads, a good blower cam, and LS6 intake???

nvmy2000ss

iTrader: (17)

Mine was at 14lbs on a 346 but thats not maxed out.

CALL911

iTrader: (17)

Too many variables, and not enough info about your setup. Do you have a D1 or a D1SC? What CR? What blower cam?

Most D1SC's max out at 18#'s of boost or so. Most D1's can go as high as 20#'s, but thats ideal setups. As stated earlier, the more the cubic inch motor, the less likely you are to see these higher boost numbers. The rest has a bit to do on the specifics you left out.

cbra-klla

iTrader: (52)

its a D1SC, what is the difference in it and a D1??

Blownramair

17+psi here 7.25+3.40, ls6 heads, 346

forcd ind

iTrader: (7)

i am curious what pulley sizes you are using and if 8 rib or not, and if you think the boost is limited by belt slip, or just max'n out

CALL911

iTrader: (17)

The D1 uses the same oil your car does from your oil pan. It is less restricted that way and that accounts for the ability to give a few more pounds of boost. However the down side is since it uses the same oil from the same pan, if the blower goes out on you into pieces as they sometimes do, it can take your motor with it.

The D1SC is the D1 unit self contained (hence the SC), meaning it has its own seperate oil, so if it goes out, it won't take anything with it, but because it is self contained it usually won't see the boost level that the D1 would.

Most guys I know run the 12 rib (myself included), as you are correct by saying belt slip can limit your boost level. With a 12 rib and a tensioner though, even maxed out I have heard of very few people with belt slip issues (in fact I don't remember reading or hearing about anyone with slippage with that setup).

David Gordon

iTrader: (1)

12.5# 395 cubes. DISC Blower cam 115ls. 710 hp

Ponyhntr

iTrader: (9)

The D1SC is NOT the same as the D1! Every single part is different including the impeller and compressor housing. The impeller and compressor housing are what makes up for more of the boost differences, but the additional step-up ratio and max impeller speed has an effect also. The oiling system has NOTHING to do with how much boost it produces.

ProCharger DOES NOT offer bracketry for the D1 head units on LSx applications. Everyone that has a LSx and they say they have a D1 is wrong. They have a D1SC.

LSx applications don't have an option for 12 ribs, so you have to consider that. They are limited to 8 rib, so there will always be a possibility of slippage if you are going to push it to the max.

Just clarifying some things for you Ben.

CALL911

iTrader: (17)

Thanks Josh. I stand corrected. Ponyhntr is the definate expert (since he works for ATI).

BTW, sorry we didn't get a chance to meet up when you and I were back in town.

Lawnboy

iTrader: (54)

I hear a D1-sc is good for 20PSI , Thats on a 346 , depending on compression, I hear not to go under 9.0 compression because it gets harder to make boost , 9.2-9.5 is where you want to be on a 347-382 forged street/strip LS1/LS6 motors.
The SD-concepts auto spring tensioner has helped and solved a lot of the belt slipping problems, and on few F-body cars i know they picked up 3 PSI with the SD concepts system and another 2-3 with a bigger-better home made air inlet instead of the procharger intake hat.

CALL911

iTrader: (17)

I have heard people claim to see 20#'s of boost on the D1SC, however this has never been proven that I have seen anywhere on paper. Some guys I have seen personally are in the same boat I am with seeing only 15#'s of boost with it maxed. I am still throwing out there that 18#'s is about the most to expect on an ideal setup.

BTW, I have 8.8:1 CR, but I don't think thats whats limiting my boost. If you plan on running 20#'s of boost 9:5.1 CR, on pump gas it will be too high, and you will need a lower CR to run that boost level on pump gas safely.

Lawnboy

iTrader: (54)

IN the GM High tech mag a few issues ago (2 0r 3) a convertivle orange SS with a 382 claimed to make 800 RWHP at 20 PSI with a D1-sc
they supposedly picked up like 75RWHP with proper tune true duel exhaust , and fuel system , to get to 800 HP
hard to believe but hoping it was true

CALL911

iTrader: (17)

Yeah, it is kind of hard to believe, but that is the first printed 20#'s of boost I have now seen out of a D1SC.