I'm liking this easy setup the more I see it. The was one that tuned up at Woodbridge dynotech, wish I was there to see/ hear it run. Maybe it's better for my marriage that I wasn't there :^)

Payam, I like the white convertible man, very sweet.

Another beauty of this setup is the around town gas mileage shouldn't be affected, that's a big plus in my opinion.

Are you guys using FMU's and MSD BTM's to manage the boost timing and fuel requirements for now?

-Christian

 

no FMU's and no BTMs.

 

Okay, then I guess people are dyno tuning with a wideband the setups to maximize performance? I looked through STS's site and saw they sell diablo's handheld, but they didn't mention it being included.

Since the Lt1 fuel pressure regulator is vacuum balanced I hope people are at least running a boost sensitive regulator to equalize the fuel pressure and manifold pressure.

If people are just bolting these on and not addressing things like this they're definitely leaving performance and durability on the table.

-Christian

 

they highly recomend tuning on ls1 cars, they do sell the diablo and it is not included with the kits.

they did do a lt1 car that had forged dished pistons and ls1 rods with 15 psi it dynoed over 520 rwhp on stock tune, stock manifolds, stock heads, stock cam...you get the picture.

they suplemented fuel and cooling at the high psi with meth injection.

and yes a wideband custom tune will get the most out of your motor. but for lt1s it can be a bolt on basic kit. tuning is recomended for the ls1 cars though, but jeepo has been on his stock tune for a few weeks now without problems but we will be doing a dyno tune in the next week or so.

 

Wow, he should really see a huge performance gain once he has it tuned. Stock timing and fuel would be way far off, even if running race gas.

Do you remember or can you check with Jeepo to see if he changed the fuel pressure regulator to a boost referenced one? If not I'd pick up one for sure, no question it's needed, otherwise the fuel injectors behave like smaller injectors (due to manifold pressure.)
The LSx fuel pumps are voltage controlled, so the pcm can be reprogrammed to offset the positive manifold pressure.

He's going to need much larger injectors regardless. I'd recommend going SVO 42#, can be found at the same price as 30# and give him room to breath, they idle like stockers no problem.

I definitely love the sound of this setup (literally), it's been a while since someone did something different for the f-bodies like this.

Looking forward to hear how the tuning goes,
-Christian

 

yeah im not too up on my ls1 knowledge but we will see how the tuning session goes, were using hp tuners so we will do a full reprogram of the pcm. the wide band will show us if were leaning out or not, then we will take it from there.

ill keep your advice in mind though about the boost referenced fpr. everything on that car is stock right down to the stock cats

im guessing it will make close to if not over 420rwhp at around 5 psi.

and the sound is just killer, the sound of when you get of throttle, the wastegate sounds like a rattle snake, and when on acceleration it sounds like a jet taking of, woooooooooooooooosh so it deffinatley doesnt have the "cop attention grabbing" nascar sound to it.

 

Yeah, I had a blast showing the video to a bunch of coworkers today, they all loved the sound.

A boost referenced FPR is a must, shouldn't be too expense. For 420 rwhp 30# injectors will do fine, but might as well go 42# while you're doing it.

injector calculations:
At 5 psi here's how stock 24 lb injectors are acting without a boost reference:

new lb/hr = sqrt ( new psi/ old psi ) * old rating
new = sqrt (46 - 5 psi / 46 psi) * 24 lb/hr
new = sqrt (41/46) * 24
new = 0.94 * 24 lb/hr
new inj = 22 lb/hr

So until the boost get referenced 6% of the injector delivery is being lost. Stock injectors can barely handle 340 rwhp, take a look at the duty cycles I'm betting they're going static. Anything much over 90% duty cycle isn't too great. Going lean is the quickest way to detonate and crack the weak ringlands on LT1 pistons.

You might have one already, but if you don't have a datalogger yet I'd recommend Datamaster by TTSpowersystems. The download lets you record 20 runs, which might be enough to tune everything. The nice thing is that it calculates duty cycle for you, saves time.

Okay, I've ranted enough about tuning, enjoy it, let us know how it goes.

-Christian

 

jeepos car is a 02 ls1 BTW, the injectors run a little differnent on them dont they? and some make 320rwhp stock so im sure his injectors are doign okay for 420rwhp, but then again we will know for sure when we dyno tune it, maybe doing some loggin on the weekend though thru the hp tuners kit.

and i have the datamaster for lt1s the full version.


have you been thinking that jeepos car is a lt1?

 

Dunno why I thought Jeepos was a LT1. Good that it's a LS1, makes sense why it's handling stuff so well (since the spark tables and fuel control are airflow (MAF) based.) Don't have to worry about the fuel regulator now :^)

Should be neat to see what that baby pulls.
-Christian