JANNETTY RACING FORCED INDUCTION Q&A

[Greenhornet2]

Originally Posted by HellEssX

Great thread for sure.
I thought was interesting no mention of ring gap. If within the 700 hp limit of 93 Octane can one presume it's not an issue?

That's where I'm at, engine has never been torn down. 10k miles on boost so far. last 5k at my power level now

[JANNETTYRACING]

Originally Posted by HellEssX

Great thread for sure.
I thought was interesting no mention of ring gap. If within the 700 hp limit of 93 Octane can one presume it's not an issue?

There is a lot of talk about ring gap but with a supercharged LS it is a non issue except for NOS.

NOS accelerates heat production on the piston like nothing else.

So the rings can expand faster than the cylinder bore.

Ted.

[HellEssX]

That's reassuring has been a worry since I started messing with 15psi and Methanol with a stock L99. I'm certain I'm not flirting with 700hp but I am in a wrestling match with my knock sensors.

Thanks for the info.

[TheFlyingBananaSS]

Originally Posted by JANNETTYRACING

use a 1/4 mile calculator

600 rwhp will go 131 mph

Most likely with ideal conditions, parts, tune, and an experienced drag racer.

My tuner went conservative on the tune because the ECS blower was noisier then expected. It has since settled in.

This was also my first time ever on a track.

So there's that. I was running faster on each pass. I stopped at 11.40 due being exhausted and hungry lol. Took a good part of the day finding the tire pressure sweet spot. Still got a good 15-20 runs in between me and my son.

Good thread indeed.

[HellEssX]

Originally Posted by Greenhornet2

That's where I'm at, engine has never been torn down. 10k miles on boost so far. last 5k at my power level now

What kind of timing are you seeing ?

[Greenhornet2]

Originally Posted by HellEssX

What kind of timing are you seeing ?

I would have to look, I don't keep a datalogger hooked up or anything. It is tuned by Ted and I just watch fuel pressure a/f and knock, never seen knock and my fuel pressure stays within 1psi. Car is away for the winter now.

[HellEssX]

Was hoping you would tell me you can use 15 deg at 15 psi which would totally make my day.

Whipple 2.9.....nice ! ! !

[TheFlyingBananaSS]

The all time question..... 2.5 or 3 inch exhaust? I'm being told a 3 inch exhaust will make you loose power.

I keep insisting there's no way putting on a 2.5 inch will give me better numbers. I'm sticking with the tried and true 3 inch.

Has anyone actually done this as a real world back to back test with same car, on same dyno, on same day?

[JANNETTYRACING]

Originally Posted by TheFlyingBananaSS

The all time question..... 2.5 or 3 inch exhaust? I'm being told a 3 inch exhaust will make you loose power.

I keep insisting there's no way putting on a 2.5 inch will give me better numbers. I'm sticking with the tried and true 3 inch.

Has anyone actually done this as a real world back to back test with same car, on same dyno, on same day?

This can not be a blanket question or answer for this.

It all depends on Power level, pipes should be sized for targeted power level

So 3 inch exhaust would hurt a v6 or stock v8 but helps a 700 rwhp combo.

[JANNETTYRACING]

Originally Posted by TheFlyingBananaSS

Most likely with ideal conditions, parts, tune, and an experienced drag racer.

Good thread indeed.

No sir that is hard math that can not be disputed.

[JANNETTYRACING]

Originally Posted by HellEssX

Was hoping you would tell me you can use 15 deg at 15 psi which would totally make my day.

Whipple 2.9.....nice ! ! !

Do not set your timing to what someone else is doing every engine, cam blower fuel combo has a personality.

It would take some really high octane fuel to run 15 psi and 15 degrees of timing on an LS3

Timing is not a flat number either.

[TheFlyingBananaSS]

Originally Posted by JANNETTYRACING

This can not be a blanket question or answer for this.

It all depends on Power level, pipes should be sized for targeted power level

So 3 inch exhaust would hurt a v6 or stock v8 but helps a 700 rwhp combo.

That's pretty much the consensus among most tuners. The need to be concerned about exhaust gas scavenging from a 2.5 becomes null at high power levels. Once your at those levels it's all about higher flow, higher power. There's a couple youtube vids of dyno testing the theory and on a 620hp engine the 2.5 lost 20hp and 30lbs of torque. But the 3 inch was nearly as good as open headers.

[JANNETTYRACING]

Just like throttle bodies, you have to find the point at which there is a restriction in order to see a gain.

Scavenging is still in play and an important design feature in any size exhaust system.

[NYCss]

What is the minimum fuel system needed to run an E60mix with a Whipple on a stock L99? Will the gains if any worth the investment? I see you did this type of work on a 6th gen with good results.