In a couple of months, I will have actual dyno numbers, but for now, all I can do is guess at the RWHP. What is a good guess for RWHP for this set up?:

383 LT1, 9.1 forged pistons, AFR heads (somewhere around 300 cfm), with a custom ground cam to meet the flow nuumbers of the heads (once I have actual flow numbers), D-1SC with 12#pulley, custom 3 inch front mount intercooler, Hooker LTs, Hooker Y-pipe, Borla cat back, LPE 58mm TB, Granateli MAF, 1.6 rocker arms, stock intake (ported to match heads and TB with a dremmel), 60# injectors, dual in tank Walboro pumps, (all forged internals on the motor), all dyno tuned by PCM's for less.

I am hoping for 600-650 to the ground? What does everyone think it will do?

 

410 rwhp.

 

Good Lord I hope it does more than that!

 

In all reality, on straight pump gas, I'm going to guess 602 rwhp.

 

Where is your cam going to put your RPM at max power? Are you using a strong low-end or high-revving motor?

The 12# blower will only translate into about 11# on a 383 ((350/383)*12). If that is the case, then you will be looking at a CR of about 15.7 (((Boost/14.7)+1)*CR).

If you use a street-friendly cam, I would venture that you are adding torque at your lower RPMs and would venture you would see about 480RWHP at 5700. If you have a cam for high-RPMs, then I would estimate about another 50-75 at 6000 RPM under full boost.

Hope you have the stout rear-end/clutch/etc. to handle the new found torque. You will be in replacement mode otherwise. Did you go with 4-bolts on your crank? You are tipping into that area where the crankshaft may not be happy with a 2-bolt arrangement.

 

I think you are mis-understood. He ordered his kit from ProCharger with all his engine specs provided. They are going to spec the pulley for 12 psi, so he will be running 12 psi.

Ben, what did your engine make NA? I know you are changing some things from your old setup, but just wanted to get an idea.

 

With the mild cam the car has in it right now (it is currently still N/A), it does 420 at the wheels. I don't see how by putting an intercooled D-1SC with 12#s of boost, and having a cam made specificly to make optimum hp for the set up, is only going to add 50-75 more ponies!

The block has 4 bolt maines, and the top end should take over 7,000 RPM, SPEC stage 3, LPE driveshaft rated at 1000hp, Moser 12 bolt. (It will take the power, I am just looking for RWHP guesses)

 

Now, your new engine should make *approximately* the same rwhp NA, given you are lowering the compression, but installing better heads and a bigger cam. BUT, in order to run pump gas, you will be limited on the timing, so that will lower the power output.

For an example, a car was tuned locally (you know the one, Ben), although it was a LS1 (MUCH more efficient engine). With a 383, ported 6.0 heads, and a D1SC running 9.5 psi of boost, made 620 rwhp on 93 octane gas.

Another example is my car, which went from 350 rwhp NA, to 460 with 6psi (absolutely NO other changes). That is a 31% gain, and since you are doubling the boost, I would use 62% as a good number to estimate what you should make.

Theoretically, 12 psi should give you about a 80% gain, but that rarely happens. So we'll use 62% as an example, using the engine you currently have, at 425 rwhp.

425+62%=688.5

 

The heads are remaining on the car, they are just being taken off momentarily to be put on the flow bench. The main changes to the motor will be a different cam, and the pistons. (Other than the new bearings, seals, ect.)

Thanks for the input Josh, you would probably be the best person to ask on this anyway. I am hoping for more than 600 at the ground, and don't really want more than 700. Ultimatly, (unless it hasn't broke the 600 RWHP mark) it will make what it will make, and I don't plan on changing too much after the tune.

 

I have a Very similiar setup man, Mine should be done around summer, If I was you I might look into the SDCE tensioner setup (no belt slippage with higher boost (12+).
I don't see why it could do 600-650RWHP. I see Lt1 blower guys with stock heads on like 8lbs with a Small blower cam and bolt-ons do 480RWHP so the above statement is way off.

A guy on this board from had combination motorsports build him a 383 9:1 CR, gasket matched Trickflows, Ported LT1 intake, 58mmtb, 236/248 Blower cam 114 LSA and 12 lbs through a D1SC with a FMIC did 700RWHP on 93.

I can think OF about 3 or 4 guys with Very similiar setups to use making around 650RWHP.

BTW my setup is a 9:1 CR VRE 383, LE AFR 216 CC heads (flow 290), ported runner LT4 intake, Monoblade, D1SC seeing around 12-15lbs of boost through a FMIC. Using a cam around the 218/230 range with a high lift.
Plan on running my stock 10-bolt with but with 3:23's. As long is you don't try to plant it all you should be fine.

I would just buy a Beefed 4L60E with a nice driveshaft. If you are going to trck it everyweeked get a TH400. If you drive it mostly on the street get the Overdrive tranny.

 

I willing to bet you should be in the 600+ been there done that with similar setup.

 

SDCE tensioner is already on the list of parts to buy. My AFR heads should flow similar to yours, and the rest of your set up sounds the same. Thanks for the input.

Other guesses welcome.

BTW, the car is a 6 speed, not an auto (its the 95 in my sig)

 

i dont think you will have a problem hitting the 600 mark. i will guess 630 to the wheels. good luck.

 

With pump gas and proper tuning, I will guess over 650 rear wheel no problem. As far as picking a hard number, I will just narrow my "pump gas" guess to a 40 rear wheel horse variation in results. 650-690 rear wheel horse.

 

575-600 rwhp