Stimey131

I have a 04 C5 with a P1SC and the #5 piston shattered. I had originally planed to build a 383 stroker when I came across a awesome deal on a 415 stoker short block. The internals are forged and upgraded to handle at least 20lbs of boost safely. My question is will my P1SC be alright on this motor. I'll be running the P1SC at 14lbs of boost and Alky methanol system
I had already purchased an ECS small blower cam, but I talked to Chris at ECS and he recommended I sell that cam and go with their Big blower cam because the compression is 9 to 1 with the LS 317 heads.

I plan to upgrade to a D1, by sending the P1SC back to Procharger for the upgrade and a good set of ported heads as soon as I save a little more money up.
thanks for any help you can provide.

MVP'S ZO6

Will it be ok as far as what?

Will it work? Yep.. Id like to think so.

BLOWNBLUEZ06

Are you going to be way under cammed for that motor?

Probably.


Will you be OK?

Yep.

veneno

I wouldn't even bother going through the trouble installing that small blower on that big motor you won't even make 4psi. Any work done to the heads? Man, low compression, big cam, stock heads, small blower it might run like poo

MVP'S ZO6

How are you able to calculate boost levels with so little information?

I could see if you knew his blower pulley size trying to ball park it? But to say it won't even make 4 psi is pure speculation..

veneno

hey it might make some boost but not enough to keep up and feed that stroker motor. Just sayin with that combo don't be disappointed at the dyno

Stimey131

That is what I was concerned about, that the blower would be to small to feed the bigger engine. I have the 3.4" pulley on it which gave me a little over 14 lbs of boost on the stock engine and that was way to much on the stock engine. I actually thought it would hold it for a little while, but it let go on the dyno when tuning it.
Do you think if I send it back to Procharger and had it upgraded to the D1 it would make more than 10 lbs of boost. I know the D1 puts out about 200 cfm more, but if the engine would only see 4psi on the P1 I doubt the D1 will make 6 psi more. if you guys think the D1 is not worth the money what would be a good option
if I could sell the P1SC head unit with 20k miles on it what would it be worth. The 20k mile were all 7psi when at wot, but 90% of the time it only saw 5 psi.

I really thought at most all I would need is a D1. The F1 is a fairly big ticket item and I'll end up paying more it than I did this short block unless I find a sweet deal on a good used one.
I really appreciate all the help guys.

MVP'S ZO6

Here's the thing bro... 14 lbs of boost on one engine and less on another (larger engine) don't mean you are going to loose power. Boost is a measurement of restriction and the number you see on a boost gauge is going to be affected by engine volumetric efficiency. I say you loose 4 psi boost swapping your current blower and pulley combo combo over. To your new engine meaning about 10 lbs of boost. Anyway...

Don't concentrate too much on achieving a specific boost number. You are making up for it with some stroke.

Concentrate more on flow of the blower, and keeping the supercharger rpm reasonable. With that said can you over spin them? Yep but too much isn't good either. It's at that point you can make a decision (based on your goals and amount you can spend) on whether you really need to step up.

On that note, it seems like you want to upgrade to a D1 once funds allow. I agree that seems like a good idea but that does not mean your car will not make power with your current setup.

Realistically I don't see why you can't get to 650-700 whp before switching blowers.

Run what you have and don't sweat it. The car will make good power and then you can save for w bigger blower if needed.

veneno

It will probably cost $800-900 upgrading to a D1
You should get atleast $1100 on ebay selling the P1 and put that towards another headunit.
I swapped out my P1 for an F1A and you can still use the same bracket.

TXGS507

I considered doing a blower with my 414ci Stroker and was told that mine would be good for 5-6psi... It too is built, forged, all the good stuff... I chose to spray a 150 shot instead. It will hold it all day everyday.. GL w your build

MVP'S ZO6

??? That's vague sir!!

You we're told what would only be good for 5-6 psi? A blower? If so which blower? The 414 cid engine? Why would it be good for 5-6 psi and not more?

Stimey131

What do you guys think about this cam? A CF member has it for sale.
Comp Cams LSR Series - 285LR HR13
grind # 54-460-11
lift- 621/624
Dur- 235/243
lobe- 113

veneno

Yo me thinks putting that little blower on big cube stroker motor will do nothing but choke the motor. The blower will be maxed out at a super early rpm it takes a lot more air/volume for a big motor compared to stock ls1, etc. also, that blower will work so hard and with already 20k miles do you want to chance something happening and hurting your new motor

MVP'S ZO6

That blower flows 1200 CFM at full tilt. To put that in some what of a perspective, your cylinder heads don't flow close to that amount.

I do agree more power will be had with the bigger blower but to say thie p1sc won't still jam is a bit of a reach IMHO.


Anything ramming air into the intake and cylinders certainly isn't choking the engine.
I stand by my 650-700 whp guesstimate. :-)

MVP'S ZO6

On that note OP I don't see why you couldn't get 1300-1500 for your p1sc.

a/c man

I have a big ECS cam for sale if you want a good cam!

a/c man

My old combo was a 402 with 9:1 stock heads med blower cam, P1SC made 12lbs boost. made good power car ran some 10:30s I say you'll be just fine upgrade the blower later on. I did...

TimbrSS

I agree. No harm in running P1SC (maxed out) to see what it will do. You can still do all those other options later. Easy swap.