Well I finally got my ALL fORGED 383 dynoed and wow, I got more than I barganed for. First I want to give a special thanks to Tracy Dennis at Sunset Racecraft in Lubbock Texas, and Greg Carroll at blower works for all of their help. these two guys are the best in the business. Now to what happened. I am currently running a D1 X race blower no intercooler Blowerworks alcy/ water cooler 84lbs injectors and Accel Gen 7 SFI with wideband. Tracy put it on the Dino at first there was problems with the Accel SFI, By the way don't call Accel they will just make it more confusing for you. after about 6 hours and a huge headache. we were getting close. he got it dialed in and the HP went way up 722 at 5800 rpm he shut it down at that point and said it was not good to push a production block that high. I forged every thing got the best parts money can buy. but the week link was the block itself. I never though about that. the blower was putting out 20lbs of boost at 5800 and was still climbing. I was happy to see the power but disapointed to here that it would not last long. if I used it. Tracy said he could get this motor to well over 800 horsepower easy I am looking for a larger pulley i have 3 1/2 now so if you want to trade let me know.
anyway that is my story it has been a year in the works. so thanks for listening.

 

well as far as pushing the production block, gen 1 blocks are much weaker then the LTX series blocks. GM beefed the casting up quite a bit and these blocks have been seeing power in excess of 1000RWHP. you may consider a few things to assist and deflection such as a main girdle, and perhaps a 1/4 blockfill. that should keep the webbing in the block a little more rigid then nothing at all and maintain the bearing alignment for the mains. but 722 is not near the limit in my OPINION. and I plan to go well beyond that before I go for the above mentioned mods, mind you it will not live there, but will see it occasionally!

unless your unsatisfied with that level of power though, maybe just pulley it down for the time being and play on the safe side.. after all.. 722 is quite a bit of power to play with! and you know the hard work is done, so down the road when your used to it, you can always pulley it back up and have some fun!

Chris

 

Congr. Job well done.

 

Nice, I can't wait to see some track times to go with that! Do you have the hp vs rpm numbers. I'm really interested to see how the curve looks.

 

DAMN! great work! need to get that dyno run on vid!

 

That is awesome!!! Great job.

 

Just to give you an idea as to how great this combo worked I was pulling 618lbs of torque at 3000 RPM and over 710 at 5200 as you can see the torque numbers were even crazier than the HP numbers. All of this was done of Pump gas. The red line on this thing is 6500 This car is a daily driver and I just was looking for about 500hp max but as I got to working on it I built to handle more. I never heard about the Production small block weakness until now, but these guys swear by it and Tracy has been in the race business for a long time and built race motors for some of the best. It is an L98 fully roller ZZ9 cam, JE forged blower pistons, Lunati forged crank and rods, four bolt mains splayed, Dart Pro 1 230s with max forced induction porting 8.5 to 1 compression. Holley stealth ram intake ported to the max, and anything else that I could think of the make it stronger and faster. Tracy did mention filling the block with filler I may try that.

 

Ah yes.. the L98 is similar to the flat tappet old style blocks.. the LT1 blocks weigh in right there where your Dart and world blocks do.. GM added some strength in the casting.. so I agree with you tuner then.. I assumed you were LT1 my mistake!

Chris

awesome numbers though!

 

Nice numbers, very nice. Congrats man.

So, a 95 LT1 block could go around 1000 hp????

 

NICE!!!

I want the guy that tuned your car!!!!
Did he only tune for WOT? Are you running 6 or 8 rib?

 

wow...........those are killer numbers............congradulations!!!!!! !!!!

Do you have some pictures of the procharger under your hood? That is one big unit...how did you get it to fit?

 

within reason.. getting to 1000hp with FI is massivly different then doing it with nitrous.. the ramp up of power is no so sudden, so I would say there is a higher risk of block failure with nitrous then FI.

as for the LT1 block handling it.. it goes without saying that the opiling system will need to be adequate to handle the power, the machine work would need to be on point, and the balance of the motor and components would need to be topshelf. as long as the tune is proper and the engine is operating as designed without incidents of damaging knock, then yes the block can handle the power. as stated above, precautionary measures such as girdling the main caps and at least a 1/4 fill of the botom section of the block will help maintain the blocks form under load, and as long as this is accomplished, and the oil pressure is there.. yes should handle it fine!

I would not try and run 500 miles at 1000HP, as that in itelf is very tough on all aspects of engines.

Chris

 

1000-1500 so far, check out the C5 f/I forum. There is a video of an LT1 going 8.02@172 makin 1250 rwhp. At only 16 psi.

As far power handling, I agree those are non nitrous figures.
Nitrous= high cylinder pressure
Forced induction= more Average cylinder pressure.
Having a denser charge, the forced induction burn lasts longer and has far more cylinder pressure present when the crank is at 90deg.

 

how did you get 20 lbs of boost? What kind of pulley are you using?

 

I am running a 3 1/2 inch pulley.

 

I thought that the D1X is the same housing as all the other D1 series blowers except with a more aggressive impeller. I owned a d1r previously and it wasn't that big from what I recall.

 

is that a conventional rib setup or a cog drive?

 

All of this is done on a custom six rib set up. I say custom because the guy I bought it from modified the bracket and pulleys on the blower bracket and I got zero belt slip. I swore myself to secretsy as to how it was done. but you can contact him directly and he could do the same to your bracket for a fee. It workes great and it makes sense when you see it. you wonder why procharger never thought of it.

 

The D1-X has got the same specs as the F-1R but Procharger said they stopped producing it because it was to radical acording to the sales guy. I could not get him to elaberate as to why.it is the same size and the D1-R but with different guts I guess.

 

2FAST,
At 3.5" blower pulley and 5800 RPM, I believe you are only turning the impellor to just shy of 53000 RPM. That should not cause any issues. I am very surprised by the 20 psi numbers that you quote, as I turn mine to within 500 RPM of max impellor speed and see less than 15 psi. What kind of I/C are you running?

As for the modifications to the brackets, I think you will find that most on this forum are aware of the modifications that are required on the P-600B, P1, P1SC, D1, D1SC, D1R, D1X, and F1R that are required to make the belt "wrap" around the pulley better for better grip. This is a somewhat simple mod, but you might have to involve your local machine shop if you are not proficient with a tig or the drill press (dependent upon model).

I would like to see the pics of this motor. Always nice to see other's pics.

QuikETs,
The D1X is not the same as the other D series blowers. The D1 and the D1SC have the same size volute (~1400 CFM), but the D1X has a different tranny case and could flow more (~1750 CFM) than the standard D-series blowers. This was an older blower that was replaced in ATI's line-up by the D1R (~2000 CFM). This was done at the same time when the D2X was phase out and the D2R (~2800 CFM) was brought in to service.

As to the comment on the D1R not seeming larger than the others, the D1R has a 9.75" diameter volute compared to the 9" volute on the D1 (and also wider), and a larger transmission case. Side by side, the R series are larger than the standard D series, and this shows as you try to mount it onto the C4 chassis. ATI says it can not be done.

Aaron