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Hello everyone, First post here. Also new to turbos. After doing quite a few google searches, I dont believe this topic has been beat like a dead horse yet. I know alot here are gonna suggest a supercharger but please humor me. Platform is a 85 g body fairly gutted, and some trick suspension parts.
Lm7 w/gen 4 rotating
lingenfelter Cnc 243
hylift johnson Ls7 race lifter (variable duration)
Upgrade rod and main bearings
Upgrade timing chain
Arp everywhere
Good gaskets
Edelbrock pro flow xt
102mm throttle body
Btr custom cam
Btr push rods
Btr high temp valve seals
Ls3 oil pump
Holley hp
Siemens 80lb deka
thinking 10.5:1
93 oct/e85
6 speed manual
Thats as much as i can think of. For turbos i am leaning toward borg sxe line. Seems like a great value for performance vs cost and reliability. Specifically twin 252sxe, 257sxe, or 362sxe in 76mm flavor, all seem to be capable on matchbot but i dont believe thats always realistic. Im open to suggestions! Thank you.
Last edited by Bearden4242; 08-22-2017 at 11:23 AM.
That's a pretty expensive shopping list. Sooo why a 5.3? I'm glad you acknowledged the blower already because that's something that's been up for debate for a hot minute. I mean if you are going twins for autox you're looking at some tiny turbos. With a 6 speed you will need quick spooling turbos and not much turbo to make big power. Like twin 6262's would be good for well over 1000.
Whats full boost? Manual trans? When do you start positive manifold pressure?
I've got a 7875 on a cammmed 5.3 with an 80e and a 3200 stall and make positive pressure around 2400. I also road race (different car, not the turbo car) and you should not normally ever be below 3k rpm.
The problem you're going to have with a turbo setup is that the turbo is going to generate so much torque in turns it's going to blow the tires up, especially in a truck-like *** light G body.
Honestly, having raced for almost a decade, i've never seen anyone run a turbo car. This is grassroots/semi pro stuff. There's a reason for that.
I'm not even a big supercharger fan. I bought a g35 a few years back that came with a centri. I took it to the track for autox a few times since it sucked in drag racing. It was soooo much fun. I loved the way it made power. It almost felt like it was naturally aspirated but made double the horsepower of a stock g35. I will always recommend centri for track days.
I've got a 7875 on a cammmed 5.3 with an 80e and a 3200 stall and make positive pressure around 2400. I also road race (different car, not the turbo car) and you should not normally ever be below 3k rpm.
The problem you're going to have with a turbo setup is that the turbo is going to generate so much torque in turns it's going to blow the tires up, especially in a truck-like *** light G body.
Honestly, having raced for almost a decade, i've never seen anyone run a turbo car. This is grassroots/semi pro stuff. There's a reason for that.
I absolutely agree. Turbos don't tend to come online very gradually. They tend to hit and hit hard which is why every turbo cars dunk graph has a huge spike. That is the point where it almost has the effect of dumping the clutch and sends tires up in smoke. My SRT4 did that. Every time I'd change gears and not wot shift while giving it gas the turbo would lag a second them just ramp in all at once and light the tires up. Burn outs in 4th gear on the freeway leaving trails lol
I've got a 7875 on a cammmed 5.3 with an 80e and a 3200 stall and make positive pressure around 2400. I also road race (different car, not the turbo car) and you should not normally ever be below 3k rpm.
The problem you're going to have with a turbo setup is that the turbo is going to generate so much torque in turns it's going to blow the tires up, especially in a truck-like *** light G body.
Honestly, having raced for almost a decade, i've never seen anyone run a turbo car. This is grassroots/semi pro stuff. There's a reason for that.
You aint kidding about the *** light part. Hoping 315's and some weight will help. Even with proper boost control? Like boost by gear or speed? I understand its not your traditional road race setup using turbos but if possible im just trying to do something different.
If you go with turbo's heat management will be critical for autoX. I'd choose a PD blower or centri before turbo's in that application due to the ability to control power more predictably.
08-21-2017, 09:59 AM
Road race/autox 5.3 turbo suggestions 
