Kfxguy

iTrader: (1)

I know most of you are just gonna day “dew it!” But seriously, consider some things. Here’s the situation, I’ve started going out to the local car meets and there’s street racing involved. Like in Mexico somewhere. And someone challenged me to a race. Well I was told the car was pretty fast and I watched a video where he beats a car that got beat by a car that beat...follow me. Lol. Roll racing by the way. So judging by that, me and this car should be a close race but I don’t want to chance losing. So....I’ve been considering turning the boost up a could more psi. Here’s how it is now, 1st gear is 8psi, 2nd is 11 and third flares to 13 on the 2-3 shift and settles to 12psi. My map sensor runs out st 14psi so I was wanting to do something like 12 psi in second and 14 psi in third. Im just thinking that where it at now is right on the edge. I’m running pump gas but I’m adding meth and a bigger exhaust. And ceramic coating my whole hot side and then wrapping it too. I’m just scared at 14 psi I’m gonna scatter it. I’ve creeped up to 12 and the 13 psi surge used to scare me but it’s been fine for a while.

Heres the details
2004 ls1 gto stock bottom end
93 octane
12-13 degrees of timing. 11 degrees in and around tq peak because on the 2-3 shift I pick of about 1 degree of knock retard.
60lb Dekas 70lbs at my pressure (I think)


or should I just add the meth injection and add a degree or two of timing? What you guys think? It’ll be ok? Lol

Game ova

If you get rid of the stepped boost, the car will run better. At the level you are at, I fail to see the point of that. That's typically something that guys who are making big power do. With that little of boost, you need all of it, in every gear.

ddnspider

iTrader: (26)

What does your traction say? Can you handle more in lower gear and does it hook the 1/2 and 2/3? If you're concerned about maxing out the map, then consider with the meth adding some timing and see how it reacts. Just make sure there is a failsafe that if it stops spraying you pull timing....that's why some spray directly on the IAT sensor.

Kfxguy

iTrader: (1)

I have the duty cycle set to 100% in first and second, so that’s the boost I get because of how it’s loaded. I don’t have the duty cycle at 100% in 3rd tho, it’s about 80% so I can go up some. Not sure how to make the boost the same. I’ll check into it.

Kfxguy

iTrader: (1)

The 1-2 does spin. The 2-3 doesn’t. I’ve added in tq management to counter the spin. The car works surprisingly well on regular tires. From a roll that is. From a dead I have to peddle it or use my drag tires.

Good idea on spraying on the iat sensor.

jayyyw

Do you have a 3-port solenoid? I'd trade you my 4-port for your 3-port if you want. You'll be able to get more boost out of it.

Kfxguy

iTrader: (1)

Ive got both. I have a new 4 port sitting on the shelf. Just haven’t installed it yet. Guess I could do that, I just didn’t feel like retuning the boost controller

stevieturbo

Stock pistons....how much is a possible win worth to you ?

Meth is one option, or some sort of octane booster would be easier for a one off. I doubt charge temps are of a concern to see major benefits from meth overall anyway.

And after the engine masters test...some proper testing on meth distribution in stock manifolds would be very interesting to see.

And there's very little you need a 4 port solenoid for, that you cannot achieve with a 3 port. And 3 ports do operate faster and over a slightly wider range of duties.

Kfxguy

iTrader: (1)

Oddly my charge temps don’t rise much at these boost levels.
Meth is definitely in the works. I’m waiting on one more fitting to get here and I’ll install it. I’m going to use the smallest nozzle I have, spraying above 8psi.

Of notable mention.
I run my afr at 11.50-11.8 in the lower boost regions, about 7psi and lower. And I run it at 11.2 in higher boost.


I made my tial wastegate adjustable, so I could add a little spring pressure and get the boost in second gear to match third gear. We usually do second gear rolls so that would help a little instead of me having to wait for it to really start pulling when I go to third.

I just picked my son up from football practice, told him I’m adding some boost. He said he has a feeling I’m gonna break something if I don’t stop lol. He said to just leave it alone. I don’t think I know how to do that. Lol.

stevieturbo

It's not oddly...they shouldnt rise too much at low boost with any half decent IC setup. That's the point.

I would tend to agree...don't tempt fate. It probably will be ok, but the risk/reward is entirely up to you.

That Boostane Professional or NF Ultra seem to be at the preferable end of octane boosters according to some online videos etc.

Or if your fuel system has the capacity and you have methanol already, you can run up to around 20% methanol in the fuel tank. But you will also need to adjust fuel tuning to suit, as doing this you'll need to add more fuel overall.

customblackbird

iTrader: (2)

U could lean out the AFR to 11.7:1 and adding a few degrees. I’m in the 17-18* range at 10psi and about 14-15* at 14-15psi on 93 pump spraying wiper fluid and a FMIC on a cammed and ported 5.3. Abet I have slightly lower compression than your 6.0 I assume. I think some good drag radials will do you some good and removing tq management due to tire spin.

If u put on the meth I would def add a few degrees at minimum.

BCNUL8R

iTrader: (2)

I'd install the meth and up the boost just for the race. Leave your current boost level for regular driving, but on race day I'd rather leave it up to me as a driver than risk not putting enough power in it for a roll race. If you get beat then you get beat, but don't lose because you didn't give it everything you had. I've been at 14 psi peak for a while and recently just took off my air filter and gained another psi. It felt like more, but looks like I just barely maxed the map sensor. Never went lean or anything and was at 85% idc with 70% ethanol afr on gas scale between 11 and 11.4. At 4800 rpm I have 13.5 degrees, 14.5 at 5200, 16.5 at 5600, 17 at 6000, 18 at 6400, and 15 at 6800 with a shift point at 6700 rpm so it pulls a couple degrees right before the shift no torque management other wise.

Even if you could do flex fuel and only make the trip for ethanol on race days it would be beneficial.

yenkomike

iTrader: (2)

just dyno'd a 1998 ls1 today. stock engine with rings gapped at .025. comp small 206/212 at .050 cam china 78/75 on e85 . 17.2 psi max boost 15.4 degrees timing . 638 hp to the wheels . 12.0 afr gas scale . not bad for a china 78/75 and small cam idles smooth. deka 80's and single aem 380 pump

Mavn

iTrader: (3)

Gen 3 200k 5.3 stock everything but cam .

ddnspider

iTrader: (26)

Is that on 93? Seems awfully lean for that boost in a stock LS1.

yenkomike

iTrader: (2)

no that was e85. it seems to make the best power at 12.0 or so . I don't worry much as long as it stays under 12.3

ddnspider

iTrader: (26)

Ah, that's a HUGE difference being on E85 compared to 93 pump.

Kfxguy

iTrader: (1)

I might just have to bump it up and only use it when I absolutely have to. If I’ve been giving it 12lbs this long, another two psi shouldn’t hurt it as long as the time is good. I won’t bump it to that until I do the wiper fluid tho.

At 5200 rpm I drop the timing a degree or two because on the 2-3 shift it pulls a degree or so of timing, picking up spark knock. I think it’s because it would surge to 13.5psi at that point. However, today I was experimenting with the boost controller and enabled a gear change setting that stops the surge. It actually worked too. So I may be able to give back that timing now. I guess it’s a process of dialing it all in perfect. The car works on the street tho. I’m just trying to squeeze a little more out of it without having to put tires on it. Why? Drivetrain is all stock besides the trans. Seeing how far I can push it. I probably should stop driving it so much. I drove it out of town two hours today to go look at a mint 80k mile 2004 z71 regular cab, short bed 5.3 Silverado. For my kid. I’d like to have it myself, I can’t lie. Slap a turbo on that. Lol. How but it’s the same color as my car too. Coincidence?

TrendSetter

i ran 18-20 psi in a full size heavy truck with all stock motor parts. keep the iats under control and make sure it gets enough fuel. you will be fine. these motors like it.