Full Power

Short stroke mouse motor needs to REV.
3.42 gears are terrible for NA truck.

elg180

I just got my set of 4.10s to install. Ill be adding the boost and terminator x when i get a free couple days.
i guess i was just expecting too much out of it NA. I always planned to boost but wanted to get through initial start up and check for bugs. I had no idea it would be so bad... i originally had a 3200-3500 converter which obviously felt better bc it took off in power band but wasn't the greatest to drive around. Doable, not ideal. Im sure someone will now say they drive through rush hr traffic with a 10000 stall converter lolol.

Thanks for input. Ive had alot of good input here.

Full Power

You will LIKE the 4.10 gears. you will like it a LOT
Immediate gain of 20% torque at any engine speed, in all gears.

grinder11

iTrader: (1)

So, are you saying nobody else has any credible recommendations??

Forcefed86

iTrader: (4)

Going at things backwards. You likely don’t need or want 4.10’s once you go turbo. Depending on what you use the truck for anyway. It will have the potential to make more than enough power to pull the current gear. Get the turbo on it first. Then sort your bugs. Your compression ratio is fine.

Not the first area I’d spend money on anyway. Get that converter out of there, it will be terrible. A change in converter will make much more of difference than a gear swap. If you go with Circle D shelf stuff beware. They are always a lot tighter than advertised IMO. Id ask for a 4500rpm stall if you wanted 3400ish on a mild 5.3 like you have.

Aside from all that, it sounds like you don’t have the setup tuned and don’t have the equipment to monitor it? Get a WB02 on there and stop guessing and throwing parts at it.

elg180

Added 411s and 3100 stall converter. Now its turbo time.
cutout through fender or big problems with exh flow when capped?

elg180

I'm just about to install my Turbo I have a prefab downpipe and my question is would it be ridiculous to weld a y on to that down pipe and have a dump come out the front fender with a cutout cover. When the cutout cover is on with that cause all sorts of problems with exhaust pressures or should I just let it go out the bottom and abandon the idea of the cutout coming out the side fender any ideas?

LS1Formulation

iTrader: (13)

Everything I've read says steep gears with a turbo are bad news. Unless you're running 31" tires, then 4.10's won't be so bad. Turbos work best when an engine is loaded. Stabbing high ( numerical ) gears into your axle will instantly diminish the load your engine sees, which allows it to rev faster. But the turbo won't spool as quickly because the engine isn't blasting as much heat into the exhaust. If your engine revs faster than your turbo can spool, the turbine can appear to the engine as a restriction akin to a potato in your tailpipe. Think of the turbo and engine as being in a race. You'll be faster as long as the turbo is winning.

Y2K_Frenzy

Even with a 2.48 first gear and 1.48 2nd gear ratios? Cruising on the highway might suck a little after awhile with a 4.10 rear and a .75 4th though.
3.73’s and a .68 got old for me cruising at the 70-80 mph range.

LS1Formulation

iTrader: (13)

Yes, even with those ratios. I've seen 8 second cars with a TH400 that run a 3.08 rear gear. You're going to rev through first pretty fast with 4.10s and a 28" tire. You should have only been turning around 2500 with 3.73's and .68 overdrive, though. That's not that bad.

Y2K_Frenzy

What got old was not having an “over drive gear” anymore where it’d just settle down and cruise. Running around all the time in the power band gets tiresome after awhile. I’ve since went to 3.31’s and it’s better.

elg180

Holley terminator x
holley 100lb injectors
Walbro 450
5.3 gen 3
Engine fully rebuilt and all forged internals all arp fastners
Btr cam 224 227 605 lift
dual springs
Ls7 rockers
Tbss intake
92mm TB
243 heads
Question is, do i install my cheapo gt45 ebay or slightly less cheapo on3 76/75.
4l80 segment swap.
O5 sierra
31 inch tires
vsr BOV and 44mm wastegate
3" mishimoto air to air intercooler
Im a little afraid of the gt45 destroying my engine ive worked so hard on.
​​​gr45ive read the on3 may starve engine though.
hoping to run about 12 tov15 lbs boost

Any advice on which turbo to run?

LS1Formulation

iTrader: (13)

Your engine combo is nearly identical to what I'm building, and I have a VS Racing 78/75 Gen 2.5. I'm not going for max effort power-wise though. Size your turbo for the maximum power you want to make. I'm looking for 750-850 RWHP, which this turbo is capable of making easily. I have a stick shift too, so I designed my combo to compliment that. Boost level isn't as important as ultimate power goals.

Y2K_Frenzy

How is it now with the 3.42 rear?

elg180

its no longer 342, i swapped to 411s. Wondering if that was a mistake. Feels good now na but with turbo i think 1st and half od 2nd will be tire fire

elg180

I'd really like to have someone's input on installing the on3 7675 or the cheap eBay turbo GT 45 clone I know they're both cheap garbage but I can't afford a Garrett at the moment which would you install? I know the on3 will spool faster but I'm afraid it's going to run out of juice around 5K

elg180

I'm looking to make around $600 wheel horsepower that would make me real happy I'm not shooting for the Moon

Y2K_Frenzy

Which of the two has a better reputation for not falling apart? That’s the one I’d opt for.

LS1Formulation

iTrader: (13)

One thing to remember with a turbo is, as long as you keep the same configuration ( T4 vs. T6, same size downpipe and outlet configs ), you can upgrade down the road to a better performing turbo and only have to change the turbo itself, and touch up the tune.

customblackbird

iTrader: (2)

Whats the target HP? Thats how you spec the turbo and the cam. Stay away from the GT45, the price is nice but the smaller frame turbos will destroy them on spool, efficiency and size. Those Gt45s are huge and heavy with bad exhaust design and tiny impellers. They work but on a 5.3 need RPM to spool where a 78/75 wouldn't need a whole lot plus be able to package easier. How much HP you want? how much boost? Are you limited in space?

Designing to a t6 gives you more options for overall growth but your going bigger turbo right off the batt. Like stated designing the system off the line so you can swap turbos for more power will make your life easier. If you planning 800hp then you could prob get away with a larger T4 but your in t6 territory if your planning on all the boosts. WHich you build suggests which is 100lb injectors (assuming pump gas) and forged internals.