I plan on buying the on3 turbo kit with my tax money in spring! I'm going to upgrade my fuel pump and injectors as well. Going with there 76mm turbo. I have the speed inc SI6 cam now. I was looking at there TU1 cam for the turbo set up. Does anyone run a big cam with a turbo? I know it's silly, but my wife wants the car to still sound like it has a good size cam with the turbo. Yes, she helps me with my builds!

 

Give the cam you've got a go,
won't be perfect, but will still make more than a factory cam..
Your gonna be limited to what the factory short block can handle powerwise anyway.

 

That's way too much cam for that baby turbine. Tu1 would be tons better or use something with a bigger turbine.

 

What about the tick performance stage1?

 

I use an XER273, 224/230, .581/.588 114. Not sure what you call big. This cam has worked really well in my 5.3 twin turbo. Here are a couple video's so you can hear it. First video is just idle. Second video is "raping" it. Third one is an in car video. Kept blowing the tires off in this one.

 

His current cam has 15.5° overlap at .050". Yours has -1° and twice as much turbine.

 

Man, I swear. . . when did cams start getting called out by letters? They used to be specified by a series of numbers, like duration, LSA, and lift. I was going to attempt to offer some insight, but refuse to research a cam name to see what it really is.

 

His current cam is a 235/240 on 111 and the tu1, I think, is a 225/225 on 113.

 

Would work alot better with a procharger,if your set on turbo i think it would be worth it to swap cams,

 

wicked69 where you from? MO plates

 

I don't think many people will be able to comment intelligently on the 235/240-111 on a small turbo because not many people have done it. My opinion is that most people get too conservative when it comes to overlap and turbo's. However, with yours, I would be more concerned about rpm range. A 76mm turbo will have a limited rpm range on your engine (6000-6200 shift), whereas that cam will unnecessarily lose low-end torque for gains at an rpm range where you can't use it.

BTW, I don't like the 225/225-113 either. I tried a cam just like that with a 76mm and it was a slug. Not many people try running a split pattern (NOT reverse split), but those who do have good results. I had been running a 224/236 cam and wound up putting it back in to get my power back.

 

Going from a 224/228 to a 231/236 in my single turbo 5.3 this spring.

Also trying a 244/254 in a drag only twin 70 5.3.

Have someone look at the valve events of your current cam and maybe advance it and run it.

 

What are the lsa's on those cams?

 

The 224/228 was a 114 straight up.
The 231/236 is a 114 plus 4 I think.
The 244/254 is a 114 plus 4 and advanced another couple degrees.

 

I just contacted Comp and had them build a cam. What most shelf cams don't tell you is what lobes they use, plus Comp can grind it for what most anyone else charges. Spent majority of a day emailing back and forth, next day had an email with a cam card screen shot.

My cam is spec'd for a LH6 5.3 (9.9:1 CR), with 799 heads and On3 76mm with .96 AR.

231/230 .617 .608. 115+4 LSA 111 ICL

 

Just as long as you relieze that comp ussualy just copy's what the LS shops order the most of. The shops like myself do the testing of the cams.

 

I say it can't hurt anything to try it, id personally try it anyway just to see. I don't think it's optimum, but might do better than anyone thinks, and if it does what makes you happy that's all that matters. My cam is 212 @.050 and makes pk power at 5200 rpm. Sounds like a pos to some but does exactally what I want and shows the power at the track.

 

Yes, I'm set on doing a turbo set up!

 

I think with a smallish turbine relative to the compressor wheel on a largish cam like that you will probably end up with a fairly high exhaust to intake pressure ratio. Might not be a problem, but I think you'd be happier with a bigger turbine...