Anybody making any serious hp with a blown lt1? I was considering buying the GMPP LSX 454 for my car. What can I do to my car with the money it would cost for the crate engine? Jeg's has it for $9200. My car has 160k on it so rebuild with 4340 rotated can be figured in. Plus that would give me the chance to lower the compression to run more psi. Other thing is don't want to spend money on stand alone efi and $548 for the adapter to keep the zf 6 spd. The lsx 454 makes 620 hp. What can I do with my lt1 and $10k ?

 

Looks like you've already answered your own question. Do the LSx swap. That's a serious motor and large-cube Ls series engines have been known to put down well over 580rwhp. There is even a few e85 NA 650rwhp LS7's on the c6 forum!

$10,000 wont get you what you're looking for in an LT-x with blower.

 

The "highest" power blown c4 (with LTx) is a tough question. Some guys likely haven't made the information public, but TJ Wong has a customer that put down 620-650rwhp with a pump-gas, alky, T-trim, 383 LTX a few years back. It was a reliatively streetable LTx, but TJ says that's the MAX they've seen. Greg at blowerworks.net was also involved in that project.

The F-body guys tend to run larger blowers and exotic intake manifolds to obtain higher power levels. Packaging might be an issue for C4 owners.

With that said, I think Russel is the "only" c4 on this forum running a YSi V7 blower. Likely able to support 700+ rwhp

there are a few other high-power blown c4's, but those cars get into the "race only" catagory.

 

Shopview made 717 rwhp w my blower before I bought it on a mild 383. I made 668 flywheel with a 383 ysi@10 lbs running out of fuel at about 4700 rpm. I have a few small things to address w my new tranny and then I'll get onto the tuning and big numbers. It'd be really hard to get big #'s with 10k though. The blower kit alone will run you at least 5-7.

 

Fab a turbo setup and make that power for 10K. You can have 3K in a complete single turbo setup or even a twin if you do it right. I got about 3500 in my twin setup. Then spend rest on the supporting mods/motor. Should do as much power as you can desire.

If you want much over 600whp with a blower i think you start getting into F1 blowers which dont really have kits for the cars. D1SC i've seen do over 600whp on 383 sbc's but a kit is 5-7K depending really and that doesnt leave much in the motor and supporting mods for 10K cap.

 

Engine management is another issue on our cars since they (the cpu) don't see boost. Some of the fbody guys change from the obd1 and obd2 original setups to a ls1 type computer.

 

Turbo if you want to go real fast.

http://forums.corvetteforum.com/c4-f...installed.html

http://forums.corvetteforum.com/c4-f...-corvette.html

Check these out and see if it interests you at all. If so, search out all of Lcvettes posts and see what he did. It has got me thinking about singles.

I dont know if 10K will do it all, and that is for LSX vs boosted LTX. But whatever way you go, I am sure it will be cool.

 

I dont know this guy, but just dug this posts up.
http://forums.corvetteforum.com/c4-p...tercooler.html

Thought it was interesting.

 

IMO anyway you go, that 9200 is just going to be the start at making that kind of power. This motor http://www.jegs.com/i/GM+Performance...44611/10002/-1 is actually just a long block, so you will still be looking at motor mounts, headers, intake, fuel injection, ignition, computer, alt. ps. etc.
A good forged LT1 with heads, and all the other misc. parts needed is going to run 8000 or more. And then again what about a computer? Another 2000 or more, and even at that, now its time to buy the blower.
I hope you do build it, and look forward to watching the build, but you will need deep pockets.

 

You can match 600+ hp on motor with a cam/heads/nitrous setup on a forged bottom end if you are looking to compete with a 427+ inch LSx motor. Alot of those motors are capable of 550-600whp on motor in a hot setup, so a 383 LT1 can make 400-430whp with a decent top end and spray a 150-200 shot setup to get near 550-600whp.

 

You should be able to match and/or exceed an LSX for $10K.
620 FWHP is only about 520-530RWHP, and a blown C4 on steroids should be able to meet or exceed this.

For an LSX, you also need to factor in custom headers for a C4 since an LSX has symmetrical exhaust ports. Custom accessory drive, custom computer and/or ignition. Wiring harness.

For an LTx, I think you would need to wrench yourself, But if you set up a forged LTX with AFR or TPI's heads that would put you in the 400FWHP Range. I think you could get this done for well under $5K, maybe even $4K. Add 8-10 pounds pounds boost would get you at 600FWHP. 12 pounds beyond that. Years ago I had Lingenfelter do all of the machine and head work and I assembled the engine myself. Total cost was under $2500 and it was fully balanced and blueprinted.

If I were to do it, I would buy an 8 rib bracket from Blowerworks for about $1500, go to a discount retailer and get a D1SC procharger (Not sure of blower cost $1500-$2000??). Dampener would be another $500. You can get a good intercooler for about $400 or just go alcohol. You would need to fab the intercooler into the car, which I plan on doing myself this spring.

You should be able to stick with stock computer if its a later year with sequential EFI (94-96).

If you are capable or transplanting an LSX into a C4, you are most likely capable of doing the work above.

The only thing worth mentioning is that with a centrifugal blower, the peak HP is not reflective of the torque curve. The LSX would have a flat curve and pull through the whole range. The blower car will peak at high RPM.

Having said all of that, at this power level I think #1 problem is getting it all to the ground and the blower car may actually be more civilized to drive on the street. The way the centrifigal blower will come on is that each shift will come at a lower torque peak which will be easier on the driveline and will also allow you to stay hooked and keep the power to the ground and then let it spool it up for peak power.

My car is approx 400RWHP and I have a hard time keeping it hooked on street tires. I can not imagine what a 500-600 RWHP car is like, let alone the C5/C6 lunatic fringe of 700 to 1000 RWHP. This comment is all relative to a car you drive daily on reasonable set of street tires that you would not be afraid to get caught in the rain. Not that you would intentionally drive a car like this in the rain, but ya never know when you might get caught.

 

1000 WHP car in the rain is no fun....