Great power for a 403.

Dynojet is the standard for a reason.

 

Great results out of a 403. Glad to see that intake on a well thought out combo too, that is a fun torque curve!

 

Thanks guys.

 

Injectors were at almost 90% duty cycle….so there’s a little room to grow yet. Again, these were OEM LS3 42 lb injectors.
Sorry for the late reply here.

 

I'm surprised 42lb injectors supported that much power. Does the fuel pressure ramp up ?

 

BSFC in a well tuned engine is typically near .5 lb/hphr. So 42 lbs/hr. times 8 injectors is 336 lbs/hr., which theoretically could support 672 hp. It's very close, but I guess it's enough.

 

Its a 2011 GrandSport C6. Original pumps and injectors. I didn’t change anything regarding fuel delivery.

 

I think I'm going to try the stock LS3 injectors. I'm expecting my engine to make about 600-610hp at the crank. You made just under that at the wheel, so I should be fine.

 

BSFC for LS engines can easily go below 0.50. I'd say 0.47-0.49 is more the norm, not the exception.

Stock LS3 injectors are excellent, as long as they are genuine Bosch.

Andrew

 

Your golden. This little 403” is 700ish at the crank.

 

Any updates Nick? Have ya had a chance to run it yet?

 

Nick is picking the car up Tuesday. He’s been a busy boy this winter.

 

Update on this long term project and what might be a cautionary tale for guys that want to jump in a powerful car thats alot faster than anything they have previously driven

After Scott had wrapped up the street tuning and taking his customer for a spirited ride with the new package, he simply advised the owner "Don't get on it in 1st....just don't (I believe the car just had street tires....not any kind of drag radial)
Then Scott added....."Don't get on it in 2nd either but if you do make sure its pointing straight and be ready to lift if the rear end wants to swap places with the front end".

Per Scott this car could spin the tire a bit in 3rd also but was much more calmed down by then. I suspect the tires were pretty old and hard and should have been upgraded before getting this car back on the road
So Nick picks the car up from Scott and he cautions him one last time to take it easy and respect the power. They placed alot of extra parts and what not in the back of the car so we assume he took it easy on the way home.
The very next morning on a long kind of dirt road that exits his rural home Nick decides that's the right place to explore his newfound power and immediately puts the car into a tree totaling it (a C6 Grandsport)

The good news is he didnt sustain any serious injuries....the car took the brunt of the impact and did what it was supposed to do (protect the occupants)
When Scott was telling me the story I was pretty sure he was busting my nuts and I asked him again....."No really....how does Nick like the car" cause I thought the dirt road bit was where he was surely messing with me....LOL

Not the case....Once I realized Scott was serious I was actually kind of gutted as this project consumed more time than most folks would imagine orchestrating all the details and sending Scott all the parts over time and the results from all the effort were obviously fantastic
Im sure this feeling was magnified 20X over on Scotts end and he orchestrated a bunch of new driveline components from RPM as well and handled all the labor which was substantial (months of work).

I just kept shaking my head on the phone not wanting to believe this was the end of this project which until then had been nothing but positive energy. That said Scott informed me this guy liked highway roll racing and Im pretty convinced this unfortunate experience may just have him living a bit longer.
He was probably in way over his head and some aren't as fortunate to walk away in that situation. You have to respect the power guys....and if you know your getting in a car alot faster than anything you have ever driven before you have to respect it twice as much and be smart about where and when you decide to explore its potential. Tires are critical....even drag radials on the street aren't very confidence inspiring in the lower two gears when your knocking on 600 wheel and 700 or more at the crank

Not sure what his plans are regarding the car....The driveline is probably just fine and at some point all this may be for sale....not sure. Scott would have more info on that should that situation ever arise
I don't know why this story affected me the way it did but I thought it was worth sharing as all (or most) of us reading this plan to push their project to the next level.
I'm pretty certain in Nicks case this build represented a big leap forward from any type of power he was previously accustomed to and that amplifies the point Im trying to make even more.

The "veterans" reading this have all learned this lesson the hard way with a few "oh ****" moments they might have made it out unscathed or with minor damage but for guy's not that experienced in this hobby maybe this quick post is worth something
I know Im one of them (school of hard knocks veteran right here)....stay in this hobby long enough and you will get into trouble but if your smarter about the respect and the "where and when" your in much better shape to have a different outcome

Catch you guys later

-Tony

 

DIRT Road!?!?!?
WOW

 

Why oh why did he think it was a good idea to try out the new power on a dirt road?? What kind of reasoning could you possibly have for that??

 

I'm sure he's heart broke. Hard lesson right there.

 

The dirt road is actually nick’s driveway. It’s a long northern Florida driveway, comprised of mostly sandy soil. Nick told me he was only going 25ish and he simply goosed the throttle. Busted his lip and crushed his pride. He’s hoping to repair the car soon but finding a nose for a C6Z/GrandSport is very hard to do. If you’ve got a nose you’d sell, send me a PM.

 

How bad is the actual car? Tony's post says it is totaled.. You are saying it is just a bumper? Maybe a whole front clip?

 

@Gt4urass where are the pics? Might as well post em. Are the wheel well housings cracked? Luckily it is a steel frame car, so if the frame is tweaked, it ain't the end of the world.

 

Hope it is fixable. I've had my share of black eyes and near misses including totaling a brand new multi-year build as a kid. This can be a very unforgiving hobby. New builds always take a bit to learn. If you haven't been humbled and hurt your pride a few times in this hobby....it is comes for all of us eventually. Best of luck to the owner.

The biggest thing is you can never take traction for granted even if 99% of the time it hooks and books, the 1% of the time your guard is down can really screw you over. My car never spins 3rd, but I've been sideways in 3rd at 90+ because of cold tires when I had NO desire to be doing that. Any time you put your foot down you gotta be ready for something crazy to happen.