98 Z28

I am possibly looking into supercharging my z28 this summer and was wondering which engine would be better to use.

The heads i would use would be tsp's ported L92 heads. Would it be a better idea to use the ls2 block for the simple reason being the l92 heads flow a lot for a n/a ls2 so when the car is supercharged it would make more power with less boost? Or just use a L92? The car is just going to be a street car and hardly taken to the track.

ty_ty13

iTrader: (42)

a l92 would be hard to beat for the money... i'd wait till atleast around winter cause they will make a single plane intake for that l92 before too long

52172

iTrader: (2)

l92 hands down. No reason to go ls2.

98 Z28

I'm just wondering if the ls2 would be better for the street just because it seems that everyone agrees that when you put a very high flowing head on a forced induction engine you don't have to run as much boost to make a ton of power. So in theory by putting the ported l92 heads on the smaller bore ls2 it will make a lot more power with lower boost. Or in the l92s case is the difference in bore size not as much of a deal?

Does anyone know if the l92's stock crank is as strong as the ls1's? Only reason why im wondering because the l92 crank is real cheap. I'm just trying to get as much information on both of the set ups before i decide to start doing anything.. If at all possible could either one of the engines with a D1sc support a 7400rpm redline?

52172

iTrader: (2)

well the redline will be limited by the valvetrain mainly and not the rotating assembly if all is equal. So yes either one of those engines could be setup to easily handle 7400 rpm redline. I would go l92 no questions asked if you have the choice. The l92's will shine on the 4" bore even though it is smaller than what it was designed for. I am not sure about the strength of the l92 crank however I imagine it is just as strong if not stronger as the ls2/1 crank. Cheers and good luck on the project.

EPP

iTrader: (22)

I'd do with the L92 and use an F1A ProCharger, which I offer here.
http://www.exoticperformanceplus.com....html?item=798 Bob

BIG BAD BLACKSS

iTrader: (4)

How are the L76 intakes doing with the L92 heads on boost? I know LS6 intakes are supposed to do great, but what about the L76? I was thinking about a LQ9 and LS6 intake setup for my 370. Now im wonderingabout the L92/L76 combo. Hummmmm. Would i be dub to get the LQ9/LS6 over the L92/L76? Im also on a D1SC build and trying to decide. Would the L92s be too much head for a 370 inch motor?

98 Z28

Wouldn't the f1a be more for a drag car then street car? I'm only looking for 650-800rwhp max.. Only reason i was asking which block is because it seems pointless to redo a ls1 and spend all the money on it when for around the same price i can get all the new engine stuff. Just trying to figure out what i want to do either the sc or a stroker but the sc seems to be a better choice for the main reason the car is a street car and will get decent gas mileage with the sc. Bob could the d1sc support a 7400 rpm redline? I just don't want to go crazy and build something so powerful it can't be driven on the road anymore and i know what i want is already pushing it for a street car..

ty_ty13

iTrader: (42)

hmmm.... you must not realize how much power 700fwhp is.... its a handful on the street with my 275/65 15 MT dragradials... a fast "street" car will be 600fwhp.... it doesnt sound like your very familiar with fast cars and i would not sugest jumping in a 800fwhp car and trying to drive it every day with no other experience... alot of guys talk like its easy to have a car like this but they arent telling the whole story of maintenence and problems that occur.... its a machine with 100's of parts and they all have to function together very well for it to work great on the street....

Juiced

iTrader: (2)

i would do l92 block but 6.0 heads, the L92 heads seem to have problem keeping gaskets together under boost.

mahhddgtp

Can someone post specs of the L92 and the LS2 so I can compare them? The L92 seemed to come out of no where.

98 Z28

Thats the thing i dont know how powerfull it is... I'm just trying to figure out what i want to do before i start buying parts and then end up wasting a lot of money on things that were not needed... I was even thinking of doing something like going with one of the engines i listed and just run it a little low on the compression but run it n/a a while because either engine with those heads will make decent power with a decent camshaft.. Then i can get a feel for what the additional power is going to be like..

98 Z28

Thats another thing if i do the supercharger if i just use the ls2 block with the tsp ported l92 heads i wont have to run as much boost in theory to make a good amount of power..

NemesisC5

I would go L92 all the way, with forged rods and pistons with ARP or Katech rod bolts. You won't need to port the heads, just put in high quality lightweight valvetrain components with Caddy racing lifters, hardened pushrods, Yella Terra "Ultra Light" rockers. Setup your D1SC with 8-rib pulley for max boost of 9-10 psi at 7400 rpm and you will have a 700rwhp screamer, EASY ! My LS1 setup puts down 657rwhp with 9.4 psi at 6500 rpm. My rev limiter is set to 6900 rpm just so I don't bounce off of it all the time. Plenty of power down low, but more on top when I have that open stretch of road to scream a little.
With the L92 setup you'll blow my numbers out of the water, with more torque down low ! ! !

98 Z28

L92 seems to be the recommended engine. will the caddy lifters work on the l92 heads? honestly i'd be happy if i could acheive around the same numbers as you with the l92 at 10lbs of boost... But it will probably be lower because i have a auto and if i end up doing the l92/d1sc this summer i will go with a th400.

Lol looks like 60mph in first gear would be possible with the th400 at 7400 rpms..

NemesisC5

Remember, it takes more cfm to fill the cylinders on 6.2 Litre motor than on 5.7 Litre motor. With that in mind, my Vortech S-Trim is rated at 680bhp while your Procharger D1SC is rated at 925bhp. A D1SC pushing through the higher flowing L92 heads/L76 intake combo and reaching 10psi will develop more horsepower & torque than mine. These are just the basics, of course this is all dependant on fuel system, exhaust, tune, etc...Oh, the Caddy lifters will work. Good Luck with Your Build ! !

98 Z28

Nemesis that is more less what i was trying to figure out is with the high flowing heads whether or not less boost is needed to make more power.. By needing less boost to make more power is that in return going to be easier on the parts so there will be less parts breaking? Or is breaking parts more often just a product of power?

The D1sc is probably what i'm going to end up doing hopefully this summer just because it will be more streetable/better gas mileage.. I like the idea of a 402 or 416 stroker with a itb or sheetmetal intake but the supercharger is probably more streetable.. I'll have to wait and see what i do this summer i want to get the supporting parts first then not have to worry as much about breaking parts.. Thanks for the info guys

Got Me SOM

iTrader: (2)

good flowing heads will help without a doubt but aren't as critical in f/i applications.

when you start making more power in general, the weak links are going to surface. it also depends on how hard you are ragging on your car.

I ran on my stock trans with a shift kit and stock 10 bolt on my setup and they have lasted but I dont go racing my car every weeek. I do have fun with her when I drive it.

NemesisC5

Just as in N/A, you want to decrease restriction from intake to exhaust. Case in point: I have LS6 intake/ported throttle body/ported MAF and make 657rwhp with 9.4psi. I am switching to FAST 90/90 with 85mm ZO6 MAF and hope to gain 15-20rwhp while I see small decrease in boost. I'll keep you posted once I get my car re-tuned and dynoed. This is the theory, I hope it works for me

98 Z28

Good luck with the upgrades. It will be interesting what it picks up with the fast intake. Some people say all you need is the ls6 intake so it will be interesting.. Let us know how it does with the new intake