Alright I have a 92 T/A 350. I currently have the edelbrock hi flo intake and runners, headers, 3 in catback exhaust. This month I'm installing trickflow heads, XFI 268 comp cam, with 1.6 pro magnum roller rockers. With all of this if I were to add a Procharger or Vortech supercharger what kind of hp numbers would I be looking at? I was searching around on the internet and saw a few ls1 supercharged only putting out 363hp. For almost 4grand I find that rediculous. So I'm just curious if someone could give me a ball park figure before I spend my money. They say 60 to 85% increase. Is this true. Appreciate any info you guys can provide

 

wow i dont know of reading too many stories on ls1tech where a supercharged ls1 didnt make more than 400 to the ground...however you want to have the right combination to suit a power adder...you want a lower comp ratio, large cc heads, and usually a pretty mild cam to start with...forged internals help too

i guess if you are simply looking to run low boost and make around 400 hp or so then you could probably just throw one on despite your current setup and run low boost to make a decent gain overall

good luck

 

a cam only LS1 will put down 363rwhp.. a supercharged, completely stock LS1 should put at least 400rwhp.. your total percent gain will depend on your entire setup.. how much boost, compression ratio, etc.. i would go for a procharger if you do decide.. its just my preference.. there are ALOT of things to take into consideration.. its a big investment, and the wrong combo will not give you the bang for the buck you are expecting.. leading to even more money..

 

Well the trickflow heads are 195cc. with the XFI cam would this make a decent setup for a charger Or am I heading in the wrong direction? Any advice?

 

the cam should do.. what is your compression ratio?? did you rebuild the motor or is it the stock 350??

 

The motor is stock on the inside, just the external bolt ons right now.

 

If you have the money for the blower now I would invest it in a nice forged short block. Get the blower later. However if your heart is set on getting the blower now then I would go with a Procharger-D1sc.
There was a show on not that long ago (i think either discovery or on the speed channel)where they took to stock 350 camaros around 90 model years and put vortech superchargers on them along with msd ignition and a C&R radiators. They dyno'd around 330 at the wheels(i think at six pounds of boost), both were automatic cars. The winner of maybe three races got to keep both cars or something like that both these guys drove like crap. Maybe with all this info you could look it up.LOL
I have a 350 Iroc w/msd ignition,edelbrockheaders,3inchexhaust,underdrive pulleys,ported siamesed runners,ported plenum,ported lower intake,36 pound injectors,P1sc w/fmic(currently 9lb pulley) with tune. I would estimate around 370 horse at the flywheel but just a guess.
You have nice heads, decent cam, but your intake is wrong(it's comparable to mine). With that intake heads and cam with injectors, a good tune and low boost I would say maybe 425 horse (i really feel the intake will limit you) just a guess though. Maybe someone with more experience will jump in.

 

I'm a little confused on the intake. It's an edelbrock Hi-flo, which I was told it was comparable to all other aftermarket intakes. Do they make them better flowing than this one? So with the trickflo heads and XFI cam upgraded intake and runners along with the headers and exhaust and 9psi from a procharger I would only be getting 425hp. Wow seems like such a waste of money. That's almost 6grand. I'm better off buying a crate motor. What's it take to get 500-600hp?

 

with the stock motor or another motor?? IMO, you would be better off rebuilding.. you can actually build it for what it is going to be doing.. also IMO, if you rebuild, go forged.. supercharger, low compression, blower cam and forged internals.. nitrous, about 10:1, open ring gaps, nitrous cam and forged internals.. N/A, higher compression, roller cam, big carb, high flowing heads, etc.. you get the point.. on a rebuilt 350, you can easily get 500 rwhp with a procharger.. and its safer and more reliable than doing it on an old motor..

i can feel someone will get me on that one..

 

Ok, I understand what everyone is saying. But If I go and do a rebuild with all forged parts that's all I'm gonna be able to afford. No new heads that are decent anyway, no cam, and I'll probably never see a supercharger. I'm the second owner of the T/A and the orginal owner was a nice old lady. The motor is just as strong now as it was back in the day. It's never seen any abuse from what I can tell. We had it apart when we did the intake upgrades and the internals are clean, no signs of burning oil or any sludge or anything for that matter. I have faith in this motor. And I'm looking for 800hp. Just a decent 450 to 500. So I know the cam I have chosen is pretty decent and I have decided to go with trick flows 23degree heads 72cc which would bring my cr down. I've tried to calculate the cr with stock deck height and pistons, 72cc heads and a thicker head gasket and I come up with 8.8:1 cr. From what I read that should be decent to run at least 9psi with a 2core intercooler. I have a 350 block already machined and bored .30 over in my garage but I have other plans for that. I just want to play with the motor I have now. And when It comes time I can swap everything from this motor to the other one when I get around to it. DDyno gives me 489hp and 508ftlbs of torque with this type of setup. I know it's not 100% but I'll be pushing at least 450hp with this setup. Wouldn't I? I don't know, someone let me know if I'm making any sense. Thanks for the help and advice.

 

I don't see why you couldn't get +450RWHP out of that combo with those heads. I'am kind of in the same boat as you, I plan of leaving the bottom end as is and install the AFR 195's eliminators with cam that I just got in. How long the block will last who knows but it will be sure fun to find out

I think with the 72cc heads your gettting the compression should be pretty safe with the boost your planning on making, mine are 75cc and should be close to 8.3 when installed.

 

Absolutely, you can make that kind of power. How high do you want to rev your motor?How much do you want to push your stock bottom end?Whats wrong with the intake isn't how much it flows but in runner length. If you push it hard enough and get an aggressive tune then you can reach your goal. I gave you a conservative number so that there aren't any surprises or disappointments.Anyway, good luck with your project.

 

I appreciate the info. What do you mean by "runner length"? And I don't want to rev above 5500.

 

Use the search feature(type in runner length and boost). This way you can get some information from more than just me, there are some very knowledgeable people on here. Since you are not wanting to take your motor over 5500rpms(which is good seeing as it's stock)then your intake will be fine. However if you were willing to go with say a mid length runner like the HSR, this would take advantage of your more aggressive camshaft,heads,and your blower there by making more power while still retaining excellent torque. Then you could get some more rpms and therefore make it more possible to reach your goal and then some.Centrifugal superchargers tend to make more horse power in the upper rpms so shutting down at 5500 wouldn't be ideal, this is one reason why I recommended building a nice shortblock first. However I have a blower on a basically stock motor and I am very satisfied.Hope this helps

 

Yes that helps alot. Like I said I have another block that I got for my 87 SS but I ended up selling that car. So when the time comes I can start building that motor will all forged parts to handle the higher rpms and all of this will swap right over too it. I think I'll be very satisfied with this combination. At least for now. Seems that it's never enough. Anyway thanks again.

 

No matter what you read or didnt, Supercharger will be worth it imo.

 

I agree completely. I just wanted to make sure all the parts were going work well together. And according to all the manuf. they will. So should be a load of fun. With some good tuning and bigger injectors I don't think I'll be dissapointed. This summer I will put together my other block with some forged parts cause eventually I'll want more power and boost.

 

I've been driving with my 142 for a couple months now. While not a direct comparison to a ProCharger or Vortec it's a blast all the same. Even tho some here preach the roots is "king of inefficiency".

I did the same thing essentially...put boost to a stock bottom end. If I knew it was this much fun I would've done this years ago.

 

If you supercharge that setup you are going to need alot of help. You will need bigger injectors, bigger fuel pump in the tank, and a very good tuner to do your chip. If your looking to pull over 5000 rpm, you might look at changing the intake setup and go bigger. If you do it you will have to be willing to take time. Look at my setup. It took 5yrs to get it running the way it does now and I'm still having problems. I make a little over 600 rwhp, and still not happy with the way it runs, and it always is breaking stuff. I have replaced 2 t56 trans, 2 rear ends (now have a 9 inch), and 4 clutches. That is all in less than 10,000 miles. The Only good thing is it still pass Cali smog tests when it has cats.