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What is the limit??? 5.3 & Radix

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Old 10-10-2007, 10:38 PM
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Originally Posted by trever1t
Welcome to the forum and welcome to another Ca member too. What are the limits of the 5.3 or what can you do and not stress too much? Lol, Brian you don't think I'm at the limit yet do ya?
Glad to be here. I'm getting a good idea of what I need to do. I plan on installing it in the next month and just want to do everything at the same time.
Old 10-10-2007, 10:44 PM
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Originally Posted by blue2003ls
Glad to be here. I'm getting a good idea of what I need to do. I plan on installing it in the next month and just want to do everything at the same time.
be careful with the "install everything at once" plan. I have found that mods over time are easier to trouble shoot if something goes wrong.
Old 10-10-2007, 11:05 PM
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read that instruction manual many times before digging in. the install is VERY simple and straight-forward. pm me if you have any questions, and ill be glad to help ya.
Old 10-10-2007, 11:15 PM
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Originally Posted by BlownChevy
Lost cyl 7 with the turbo and pushing 12 psi.
Im going the rout of turbo. So its safe to say 8psi is good for a daily driver?
Old 10-10-2007, 11:23 PM
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Originally Posted by Freakenhye
Im going the rout of turbo. So its safe to say 8psi is good for a daily driver?
its all in tuning. the stock gm intake manifold is known to have problems with leaning out the rear cylinders causing them to blow.
Old 10-11-2007, 12:12 AM
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Originally Posted by laynlow77
its all in tuning. the stock gm intake manifold is known to have problems with leaning out the rear cylinders causing them to blow.
They had this problem with the Cobalt SS/SC and the number 4 was the problem on that engine, and it was the manifold also.


Wow. Very Intresting.
Old 10-11-2007, 12:33 AM
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Originally Posted by Freakenhye
They had this problem with the Cobalt SS/SC and the number 4 was the problem on that engine, and it was the manifold also.


Wow. Very Intresting.
ive heard of alot of people switching to the ssr/tbss intake to solve this problem.
Old 10-11-2007, 07:51 AM
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I have the RADIX, mods in sig below, no cam or head mods, with the 3.0 pulley and my RamAir I get 11.5psi 0n a 95deg day and 13psi on a cold day at the top of the shift, I see 10psi from 3500rpm up.
Its my DD and its been doing this for 30,000 miles, it just takes a really good tune, I use HPTuners.
BTW the only way I've been able to fuel this with out 60lb injecters is with the Magnavolt and Meth.
Old 10-11-2007, 08:14 AM
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I don't want to steer this thread away from helping blue out, but LBSBLOWN...holy ****. I have never read about your 13psi before. Must be some restriction in there. 400HP and 13psi doesn't sound right. Not calling you out brutha, just asking more about your setup. Your sig does say alot. With the hptuners...what kpa reading are you getting?
Old 10-11-2007, 09:43 AM
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I was going to buy the meth kit with the Radix but I don't want to have anything on my truck I will have to take off for smog. CA smog sucks!!!


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