I currently have a 2002 LS1/T56 set up in my 1800lb cobra replica. This car is pretty much a daily driver when the weather permits,

I am considering a magnacharger, and wonder what advice you'd have on a cam for that setup

I have a stock bottom end, so will be using mild boost till winter, when I can do a little more work with the motor

I have a good free flow air inlet, LS6 headers, and straight through exhausts from the cats back.

I need to pass emmissions annually, so can't get too radical with the cam, (nor do I need to with the light car).

Any advice welcome on my plans

 

Damn, that thing must fly just as it sits.

You might look into a 214/220 115.

Have you considered just doing a good set of ported heads with a 224/224 cam? You won't add any weight and you'll pick up 70+ HP.

 

SPG,

What Cobra relica is 1800-1900 lbs?? That doesn't look like a FFR, its got a full space frame backbone thing, instead of the semi-ladder frame looking FFRs.

 

Ragtop
I have thought about heads and cam, compression & strokers, but went that route with my last cobra (383 chevy). It took a lot of downtime for me to get it all together right, and this time I want a "bolt on" power adder - and want to try something a little different. It also left me with a car that was a little tempremental, and I like the thought of something which will perform more like stock. I also spent a while looking at the D1sc, but so many guys on this forum seem to have issues with belts, alignment, flexing and slippage, that I am inclined to go away from that to the magnacharger. less max power potential I know, but easier wrenching I hope. (and I confess to liking the look of the magnacharger)

and thank you - it does go quite nicely as it is, but I do miss the "grunt" of my old 383 - though I love how freely this LS1 spins in comparison


I also discussed with magnacharger the potential for this system should I decide to stroke, or add better cam and heads, and they gave me confidence that I can pulley this setup to get to my goals.

Grant
This is a Gardner Douglas replica, which is based around a rock solid chassis, with all the suspension components made in house, It is very light but rigid, and does weigh in around 1900 lb (though quite a bit more with me in it!)

 

We have seen problems with the magnacharger handling over 465-500RWHP without belt/pulley problems.

I would do a mild cam (224/230 on 114LSA) stock 6L heads (9.1:1 compression) with the 6L gaskets.

Add a Magnacharger to that and you'll make 450RWHP/450RWTQ idle close to stock and pass emissions with a decent tune on pump gas.

You'll need fuel system and injectors as well as LS1edit tuning.

That car will be sick with that setup LOL!

 

Chris, thanks for your input here
please enlighten me on the pulley issues you have seen - I don't want to miss a known issue if I can engineer it out up front.

I was thinking a 224/224/114 for just a cam change without the blower, but the cam you suggest with longer exhaust would be great for the blower - any vendors ramps worth looking at specifically?

The 6.0 heads, I read of issues with valve shrouding due to the smaller bore and larger heads, any views?would you increase valve sizes and port?

I have HP tuner (which I have found great) and am using an aftermarket fuel system , which I'll need to verify is good for this setup. we are fortunate to have 98 gas everywhere here, so I hope it'll be happy on that (my last 383 sbc 10.5:1 was fine on that, hated 95 though!)

what are your thoughts on pulleys and target pressure? I still have time to amend those if I need

The last part of my thoughts on this are the headers. currently I have LS6 stock headers, cats, and the rest is straight through 3 inch. What would be gains if I spend another $600 on getting a set of stainless headers made, and what size would be best

"That car will be sick with that setup LOL" -

Thanks - its quite fun without the blower, but it'll be soooo much more fun with!

and thanks for your patience here, there are only a few LS engined cars in the UK and only a couple of places which work on them, (none of them specialised) so any advice is really useful as my experience with this engine, and the options is limited

p.s - I bet your cam sounds wicked!

 

Thats great you can get 98 Octane. I'll check on the pulley issues. I believe it is an issue when you try to pulley up for more boost. You are limited by the space for the pulleys and also belt wrap.

I would pulley for ~8-10#s boost with the 6L heads and 9.1:1 comp on 98 octane.

Shoot for 11:1-11.5:1 AF ratio on the chassis dyno/wideband and start your timing around 16 degrees and work your way up.

Are you looking at an intercooled kit?

Headers with highflow cats will make a TREMENDOUS difference. 50-60RWHP easily.

Look at Magnaflow 93009 3inch highflow cats or RT ceramic 3 inch cats. You can run bullets for additional sound control but the cats do a pretty good job of controlling noise.

Sounds like an awesome project best of luck with it!

BTW as far as lobes you have a lot of choices. I am running Comp XER lobes but they require a good spring. You can also look at Lunati lobes in the mid 500 lift range that are based off their "big block" lobes. XE lobes are good as well and provide good valvetrain stability.

 

Ive been doing research on this exact setup for a customer, and according to LPE, the cam they developed to work with the Magnusson SC is as follows: PN is GT2-3, .207/.220 566/580 on a 118.5 LSA. Obvioulsy very mild, but seems to be a blower cam up one side and down the other. Just a suggestion.

 

Many of the Corvetteforum are guys are getting great #s out of the 21st Century Muscle car blower cam. Its bigger that the LPE GT2-3 but not sure of the exacts.

 

I'd still opt for a D1. You can go with a 8 rib setup that will eliminate belt slip especially if you're going to stay @ or under 12#. D1 is a proven option with lots of growing space.

 

Chris,
this will be an intercooled kit. Will the stock bottom end be good for 8-10?

phanta
polo

thanks for the cam suggestions, and the comment about corvette forum - it might also be a good place to look for comments about the magnacharger system,

cyphur
I have given lots of thought to the d1sc, and am sorely tempted due to its increased potential over the magnacharger, but although I am fine with wrenching, I am not a fabricator, and I know the d1sc won't fit in my chassis where ATI would have it mounted on the LS1, so right off the bat I would be into re-engineering the mounts/standoffs etc.

 

If you are making custom headers you could go turbo

 

As others have mentioned, and after looking through the www.corvetteforum.com ,apparently LPE has developed a cam to work with that particular blower. Giving them a call might be worth your while.

I believe typical power to the floor is ~500hp. With an 1800lb chassis that would be hella fun

 

twin turbo's would be kinda funky - but my fabrication skills (and my patience with a custom setup and all that entails) would be very limited.

to do that properly I guess i'd alsoi have to do the forged internals at the same time, and I can't afford that as well right now

I really wish I were as skilled as many others who really do build cobs (and other cars), rather than bolt the bits together as I did.