Right CAM Lift for turbo Motor
I have a TTi TT setup with a small cam with .551 lift. I'm going to forged the motor sometime in the next 12 months. looking at 346, 370 and LS2 402....
I'm leaning toward the 346 (cheaper) and I can just turn the boost up for added hp & TQ. I know with the 370 or 402 I'll have more TQ low and mid range then now- but with over 600rwhp and over 550-585rwtq(rich tune, run Torco sometimes 2, mix 100/93 or 100), it hard to get the tires to stick in the lower gears now..... Speaking about tires, I'm running Nitto's 555R2's and I like them very much. Don't drive in rain. If I was looking for the next "small" jump in tire sticky, what would that be.... I'm not looking at MT or ET Streets... I want something that I can handel better(Road Race 3-5 times per year, run on the street), stick a bit better and can take warp speeds runs in the 160-180 mph without any issues. I only go to the track 1/4 2-3 times per year, I'm not going to switch tires and I don't want to have to upgrade all of my rearend because I have very sticky tires. I want the fusable link to be the tires and well- let then smoke and not my rearend smoke and explode... If I stay stock rear and don't launch harder than 3K, how long might the read last? If I just upgrade the output shaft(s) for the 700-750rwtq, will the rest hold up- again, no launches over 3K...

Anyway my real question is- I was told that running any cam's over .550 lift is a waste or said another way limited returns and just hard on the springs/valvetrain??? I was looking to go with a .583, .591 or .602 lift on my next cam choice.... I'm not planning on running the best heads AFR's or ET, anyway- Patriot's or Dart's are fine for me. I rather invest money in larger TB and Fast (90/90), upgrade fuel system(which I'll have too- running with BAP only) and a twin clutch- McLoed?.. Is this even worth the money(90/90) with boosted motor??

My goals are 750rwhp max.....

Thanks!

 

Take a look at the build we did on this C5 Corvette. http://www.exoticperformanceplus.com...Car.php?car=40

740 rwhp with mild cam, 346 ci, stock LS6 intake, stock maf, Patriot LQ9 heads, forged bottom end, nothing exotic. I'd put your money into a good fuel system, check out what we did on the Corvette's fuel system shown above. Bob

 

High lift cams do tend to put more strain on the valvetrain but I wouldn't say it is a waste. Of course the more lift you have the better the springs, locks and retainers will need to be and typically the more often they will need to be replaced but keep in mind it would have to be some serious lift before any of that came into play. Another point of interest and one that some seem to confuse sometimes is that it is a rule of thumb that with forced induction that you DON'T NEED allot of lift to make good power but this isn't to say that more lift is a waste. Good luck to you.

Jim C.

 

The question is how much lift is going to mean doing the springs every 20,000 miles. I would think under 600 is ok in that regard ? I am thinking just go to 1.8 rockers on my pretty low lift gt7 cam to get a bit more lift.

And while I can't speak from ls1 experience on higher lift and bigger duration cams in my dsms the bigger cams definitely make more power and of course the powerbands tend to go farther up the rpm scale as you go crazier on the cams as well.

 

231/226 601/591 115 lsa

Thats what I am running and some other guys have gotten good numbers off this same cam.

 

250/259 @.50 637/631 114 Center.

 

^^^^^^I'd like to hear that idle...^^^^^^^^

 

Yeah so would I.

 

639/649 on a 114

 

"stick a bit better and can take warp speeds runs in the 160-180 mph". At rpm's to attain that speed, I'd say a very durable valvetrain is a must.

 

Talk to Patrick G. I was running a 551 lift cam and wasn't making the power it should with a 402. I had one spec threw him unreal difference. My power band with small cam was only holding power for about 1500rpms.

 

Depending on what cylinder head you go with(sounds like a budget head u have in mind) there wouldn't be any need to go much over .600 lift range IMO. I would be more concerned with what Duration #s @.050, ICL/ECL, and LDA along with proper valve spring pressures your going to need for this combo. Your Duration # @.050 will dictate what amount of lobe lift the cam will have anyways, so start selecting from there, but .570-.600 lift range should be fine for your application IMO. Hope this helps.


Joe

 

Joe, thanks for the feedback- this has been the feedback yet....
Thanks again,
John

 

Any feedback on "I rather invest money in larger TB and Fast (90/90), upgrade fuel system(which I'll have too- running with BAP only) and a twin clutch- McLoed?.. Is this even worth the money(90/90) with boosted motor??

My goals are 750rwhp max....."
The 90/90 for boost......

 

I would use a LS6 intake and ported t/b and save your money and put it towards a PROPER/CORRECT fuel system. This is where the motor will thank you for that.

 

Very good- I have an LS6 intake and my Tbody id ported..... What kind or should the specs be for a proper fuel system to handel 750+RWHP.....
I have 60lbs injectors, who much will these handel safely?

 

Joe, cam cam spec(s) would you recommend with a 346.... Currently i'm running a small cam- 210/218 .551/.551 LSA 112- it provides great low and mid range TQ and over 600rwhp with just 9psi of boost.... I use this car as weekend fun and don't want a BIG cam sound, but a bit agressive sound is nice...
I'm thinking of the following:
220/224 .581/581 -114
225/225 .581/581- 113
224/228 .575/ 582- 114 or
228/232 .583/602- 114

Thanks
John

 

I just got a twin turbo setup done with a texas giant.

 

218/224 .585/.585 115

 

I would go to 6-8° split and close to 600 lift if you want it on 114 but i would advance it to 110°