Looking for a good cam for street driven Lt1. I don't want to go lower than 113 on LSA. Close to stock idle would be good, but not a necessity.

I have a 97 TA LT1 M6, stock cubes (350ci)

Tea Stage 2 Ported LT1 Heads flowing like so:
.200 142 111
.300 200 165
.400 242 204
.500 270 229
.600 267 243

Plan to use one of the following: (T76GTS, T76 Q trim, or equivalent) on a TTI setup (yeah I know it sux, but that's what's going in for now), Delta Waste Gate, 42lbs injectors. Spearco FMIC.
Starting at 8lbs of boost, will move to 13lbs but not in near future.
Looking for good throttle responce from 2800ish to 6000ish RPMs, don't plan to rev higher than 6000 for now.
I do have N2O I want to use with this, no more than 150 shot. Probably just a 50 shot to cool intake temps. might possibly do a meth injec syst.

Wanting high 400's hp with this, maybe into 500's without N2O.

 

For those modest goals, there's no reason to go over 220 duration. Something like 218/218-114 would be perfect for you.

 

Well, seeing as how you want to use a tti street kit (which becomes restrictive with more boost and rpm), I suggest getting a cam that will peak around 5500rpm max. Try and talk to some cam experts to see what lobe combo will get you to around 5500rpm peak power. Perhaps some of these combos will work well and still sound fairly tame:

Regular lobes:
210/210 .533/.533 (112 or 113 LSA)
215/215 .533/.533 (112 or 113 LSA)

 

side note.

Mike how do you like the 224/236 with the turbo set up ?

 

It works. Reverse split cams in turbo's are waaaay over-rated. When I get the kinks worked out of mine, it will be in the 750+ rwhp range through the auto / loose converter. ForcedInductions just built a 370 cid LS1 that made 980 rwhp through an auto / loose converter with a turbo at 22 psi and a 236/242-112 cam.

 

what are the disadvantages to running a larger cam for turbo, or fi motors? i have heard so many people say certian things about cam and fi motors but most of them arent the ones running the turbos or superchargers. im going to build a turbo setup for my t/a and i am going to run the cam i have right now and see what power i make. then i thinking im going to switch cams and see how much difference there is. btw, the cam i have now is a solid roller 250/256-112.

 

what do you mean by loose convertor? sorry kind of a newb when it comes to autos

 

My converter flashes to 5400 rpm when the boost comes in.

 

That's a good question.

The risk has to do with rpm range and is quite different from a turbo to a supercharger.

Supercharger: Since boost is proportional to rpm, a centrifugal supercharger will typically raise the power band 1000 rpm or more. When you have a large cam, then add a supercharger, you wind up with an engine that's relatively weak on low end, but screams on top.

Turbocharger: In many cases, you can't or don't put a large enough turbo on a V-8 engine. So, unless you go with a Thumper T-6 turbo, the turbo can only support x cid to x rpm. The rpm range of the engine has to match the turbo's capabilities. For instance, if the turbo can only support 383 cid up to 6000 (such as a T-76) and your cam is 260 at .050, then it's counterproductive.

 

again im pretty stupid when it comes to autos, whats "flashes"? and is this a streetable setup or track only?

 

When I hit the gas, the converter slips enough to let the engine go to 5400 rpm. If it were a 5400 rpm stall naturally aspirated converter, it would be way too loose for the street. However, with a turbo, the torque output is so much that it makes a streetable 2800 Vigilante flash to 5400.

Mike

 

hmm that is very interesting, may i pm you with some more auto q's?

 

sure

 

How would a 221/221 558/558 lift 114LSA lunati cam compare to the Comp XE 218/218 114lsa 110icl .528/528 in terms of driveability and power/performance range on this setup? Will a little more durration and a little more lift help or hurt and if so at what range?

 

They will make similar power, but the lunati will be slightly higher. Acording to the engine analyzer pogram was playing with, they both peaked around the same time (6k rpm). Either one will work good. Thats my opinion.