Detroit Steel

It’s now becoming crystal clear that the guys over at Late Model Racecraft are pulling off some impressive performance upgrades for Corvettes.

One of their most recent showings includes what's believed to be the fastest quarter- and half-mile speeds to date for a C7 at 148 mph and 175.5 mph, respectively ... on boost only.

The feat was accomplished on street tires at the Texas Half Mile, which you get a sense of from the lack of traction. The team says they also had some problems shifting it at higher rpms, which made for some very long shifts.

See the video on the Corvette Forum blog.

turbo8765

What kind of shifting problems?

How much power does this car make?

Late Model Racecraft

Shifting problems from trying to shift above 6800rpm at 1000+rwhp and the clutch pedal going to the floor.

turbo8765

WoW

~Stingray

What did you upgrade?

Late Model Racecraft

This car has the factory Transmission and Rear end in the car.

Late Model Racecraft

It is a LMR 416ci engine with YSI supercharger making over 1000rwhp on boost only. Also has nitrous to push it close to the 1300rwhp marker when used.

There is another 1/2 mile event coming up in a little over a month. We are going to see if we can have our twin turbo system installed for the event to see just how fast a C7 Corvette can go with 1300 plus RWHP!!

SS 1LE

Transmission speed ratios do with any amendment?
its very badddddd
thanks

irun4cops

what DI injectors are you using? something in house or obtained where?

Theta

Fairly sure the injectors are still stock unless they changed it recently - they're obviously using a larger fuel lobe on the cam and most likely a different fuel pump (or BAP).

irun4cops

bap isn't an option as the pump is at the engine and ran mechanically off the motor.

Im pretty familiar with these cars, we don't need guessers cluttering up threads.

irun4cops

through the grapevine, i thought i recalled someone stating the cars ran out of fuel around 650 or 700hp. Not sure how accurate that is however.

If the fuel system is still stock, then awesome.

But if they upgraded it, then the only 3 options that i know of are a larger volume sending pump from the tank...

a higher pressure or higher volume DI pump at the motor...

Or larger holed, or more quantity of hole, DI injectors.

If I'm mistaken, please correct me LMR.

irun4cops

Last i had heard,

extending the fuel injection duration, via a longer lobe, had negative consequences of cylinder wall scorching as a possibility, as well as a few other factors that seemed to amount to... increasing the injection duration times werent the simple fix.

However, this could also be wrong, because if the cars do cap at 700hp... then these guys obviously did something to remedy it.

NastyChevelle

Actually, for your information, a BAP is an option. They still have a pump in the tank and until you've actually worked on a c7 (notice I didn't say own one, but worked on one) you can get down off your almighty high horse of assumed knowledge. People are on here to learn, not to hear someone talk down to someone because they think they know more than them. Theta actually works on his car, not just talk about it.

Maybe Try to be less of a dick in your post next time.

Higgs Boson

irun4cops, you sure have a lot of questions and uncertain statements for someone who is "familiar with these cars."

irun4cops

the way you are describing the boostapump... is an additional inline pump to the in tank pump... which I'm aware is there. My above posts states that it is 1 of 3 possible bottlenecks in the fuel system when one goes to upgrade it...

1. the amount of FLOW the in tank pump provides the the DI pump up at the motor (if the in tank pump doesnt flow enough fuel, then the DI high pressure pump at the motor can be starved of fuel)

2. The DI high pressure pump itself, can be upgraded to provide more pressure and/or flow.

3. The injectors... the size of the holes or the quantity of holes, allowing for more flow.

those are the only way to upgrade this fuel system.

BAP the way you are describing it pertains to the in tank pump, and adding to its flow.

Sure its a viable option, but in the past, with the 3 high hp cars i have had, i shy'd away from boostapumps as i was having cavitation issues with them.

perhaps those experiences I've had have me a little unwilling to entertain boostapumps as a good solution.

In addition, if the injectors or the DI high pressure pump at the motor ARE the bottlenecks to the system, then a boostapump up stream of them back by the tank, isn't going to change the amount of fuel pushed into the chamber... only IF the in tank pump is the weakest link, would a boost a pump be of any use whatsoever. If thats the case, then a boostapump is an option, but i will be upgrading the in tank pump... in my car to a larger one.

However, most people, when the refer to boostapumps on this c7 setup, are speaking out of ignorance, as they believe a boost a pump can be mounted between the high pressure pump at the motor, and the injectors to BOOST fuel pressure at the injector where it matters.

This is incorrect, one cant be mounted here, and thats what i was referring to.

The term boostapump, on the C7, if utilized, is more specifically an upgrade of FLOW pump... so that the DI high pressure pump at the motor doesnt starve... IF it is.

Hopefully by now its dawned on you... i work on these cars.

Sorry to sound rude if i did... i just came to a specific thread to ask a question to a specific person... who does build the cars.

i could guess all day long and try to sound intelligent also...

but rather than do that.. i asked a question.

When others started talking just to talk... i demonstrated i can do the same thing. But at the end of the day LMR has the answer and none of you do.. am i correct?

So lets wait for them.

NastyChevelle

You must be an engineer huh? That was a nice story you wrote but in the end it is you who has the wrong idea of a boost-a-pump. I think you need to do some research on a Boost-A-Pump and get back to me. And by working on these cars I don't mean at a dealership washing them. I mean modifying them and finding the weakness of certain areas. Knowing how many high hp c7's are out there, something leads me to believe you aren't one of the ones with one, because you keep preaching some theory you've come up with. Well I have news for you, ditch the theory's and try something in application. You'll learn a whole lot more that way.

Theta

That was uncalled for, and distasteful. Sorry I'm "cluttering up threads" as a Tech Contributor with direct ties to General Motors. It's not like I speak to these shops on a regular basis, or they all have my cell number...

My sincerest apologies for offending you, whoever you are.

Call Reid @ LMR tomorrow instead of resurrecting old threads. Thanks.

Theta

Glad I'm not the only one who saw that...

For someone who doesn't like people "guessing" about the platform he knows quite well, he does surely have a lot of... well, guesses.

Oh well, sorry Reid. It takes all kinds...

irun4cops

sorry theta, sincerely.

Most people on these threads don't have a clue.

As for chevelle up there, i do own and build the cars. But i have a feeling no matter how much talking i do, you don't want to hear it.

So have a great night.