[asthmamax11]

Had an awesome time driving in North Georgia mountains today. Car felt amazing with the 888r's on the back.
Thinking of getting smaller pulley for the Magnuson.
Thinking someone needs to talk me out of it.

[Joshinator99]

Originally Posted by asthmamax11

Had an awesome time driving in North Georgia mountains today. Car felt amazing with the 888r's on the back.
Thinking of getting smaller pulley for the Magnuson.
Thinking someone needs to talk me out of it.

If you’re still on the stock LT1 fuel system, maybe another 30-40 horse safely I’d guess (your sig says you’re at 551 now). Start upgrading that fuel system if you want to play with boost...

[laynlo15]

I'd say 600 will be your limit. Are you running the 90mm pulley?

[asthmamax11]

Originally Posted by laynlo15

I'd say 600 will be your limit. Are you running the 90mm pulley?

I'm still on the 98mm...lots of opinions about fuel limits, heat soak, etc have swayed me away from going smaller.

I think people have learned alot more about the platform now than when I got the kit almost 3 years ago

[appleman22]

i'd more worried about the pistons then the fueling

[Joshinator99]

Originally Posted by appleman22

i'd more worried about the pistons then the fueling

Get the fueling right, and the pistons magically get stronger... I was over 650 wheel last year on stock pistons and rods with no problem.

[toohighpsi]

Originally Posted by Joshinator99

Get the fueling right, and the pistons magically get stronger... I was over 650 wheel last year with no problem.

So true - if you get enough fuel and octane, pistons will go pretty far.

We've run at 728 RWHP all summer (10.3s @ 135) with straight E85. We'll be bumping the boost up a bit more for our next track outing to drop into the single digits. Will that be the limit? Maybe - we'll let you know.

[asthmamax11]

Ok thanks alot guys
Good to hear other's experiences
My car still puts a smile in my face everytime I drive it. Can't imagine not having boost now. Lol

[KingLT1]

I would leave the boost alone, upgrade the fuel system, flex sensor, and run a mix of E for added octane and cooling. You will make more "safe" power then upping the boost with the stock fuel system on 93. I bet you would hit around 600whp with E60. 93 pump isn't really enough octane for these high compression engines unless we are talking very low boost levels(5-7psi tops) which is why many are pinching the rings. Yes they have tight ring gaps but if the compression was a point lower like the LT4 they would tolerate a lot more power on 93 and likely be less failures.

[PeteSS2018]

I'm at 9.5psi, apparently a relatively conservative tune, about 560whp. In a year of driving Ive had no issues, although I dont drive it hard too often either and rarely get anywhere near redline ....

[asthmamax11]

Originally Posted by KingLT1

I would leave the boost alone, upgrade the fuel system, flex sensor, and run a mix of E for added octane and cooling. You will make more "safe" power then upping the boost with the stock fuel system on 93. I bet you would hit around 600whp with E60. 93 pump isn't really enough octane for these high compression engines unless we are talking very low boost levels(5-7psi tops) which is why many are pinching the rings. Yes they have tight ring gaps but if the compression was a point lower like the LT4 they would tolerate a lot more power on 93 and likely be less failures.

Upgrading fuel system is a big commitment.
I would upgrade the Cam also.
It just seems when you get close to 600whp it is exponentially more expensive to push past it than to just let it be at a "safe" level based on what kind of octane is available.

Aftermarket is still atrociously expensive for alot of parts on 6th gens

[laynlo15]

I think the fuel system is a good route. Probably around 2000.00 with labor. Its a pretty easy job on a 2300 Maggie. Injectors are not plentiful at this time and hard to get unless something has changed in the last week or so.

[KingLT1]

Originally Posted by laynlo15

I think the fuel system is a good route. Probably around 2000.00 with labor. Its a pretty easy job on a 2300 Maggie. Injectors are not plentiful at this time and hard to get unless something has changed in the last week or so.

I agree 2000.00 for another 100whp + of fuel system headroom isn't really that bad. Honestly if I was starting over I would of bought the +30 FIC injectors instead of the LT4 because I could probably run Full pump E at this boost and some. Especially since they have came down in price. The FIC literally take 5 minutes to tune.

I think the best approach is to invest in the fuel system first, then build the motor second depending on goals. These engines will tolerate some pretty good power if you keep the cylinders cool.

[Eldi Z]

Originally Posted by KingLT1

I agree 2000.00 for another 100whp + of fuel system headroom isn't really that bad. Honestly if I was starting over I would of bought the +30 FIC injectors instead of the LT4 because I could probably run Full pump E at this boost and some. Especially since they have came down in price. The FIC literally take 5 minutes to tune.

I think the best approach is to invest in the fuel system first, then build the motor second depending on goals. These engines will tolerate some pretty good power if you keep the cylinders cool.

And for 93 Octane pure pump (no added Meth), between the 550 - 600 RWHP even at the stock LT4 Charger Pulley size - producing ~ 9- 9.5 PSI:
Would the upgrade to the LT4 fueling safeguard the pistons from heating too much (and then potentially causing the rings to butt)?