hnaskoct

Well i talked to a tuner and i was told that the lt1 engines does not deliver enough fuel pass 450hp also he said that the pump is capable of it but the injectors arent..so it threw me for a loop because i see alot high high hp c7s on this forum and youtube...well i also asked about doing the e85 flex fuel mod and i was also told that it wont have any benefit because the fueling only supports up to 450hp,he said that why most guys run methonal because of the lack of fuel since bigger injectors arent available yet...so guys and tuning gurus any truth to this stuff????#REALLY CONFUSED

Higgs Boson

you could run up to around 600-650whp (around 700 at the engine) on the stock fuel system.

things you can do to bump that up are:
Z06 high pressure fuel pump
Z06 injectors, but not necessary as the Z06 pump probably won't max out the LT1 injectors
Lash Cap on the HPFP
32% cam lobe if you change your camshaft
and of course pushing more fuel pressure with the tune

With just a 32% cam lobe, lash cap on the Z06 pump, and a meth kit there are shops/guys out there making 1200 HP.

I would recommend you find a new tuner unless you want to be a guinea pig.

c6switchblade

I have been upwards of 760whp on the dyno without a cam and a single nozzle, stock hpfp with a cap only... Should be over 800 now easy with a few new things I did and a dual nozzle methanol setup. Find a new tuner.

Motohead279

I started out adding a ECS1500 SC (8lbs of boost) and I was around 585hp.

I then added a month or so later a single nozzle meth kit and I was just over 600rwhp. Still 8lbs of boost)

My next mods were a 416 stroker, cam with a 33% increase in fuel lobe, dual nozzle meth kit, 2" AR Longtubes, and removed the restrictor and smaller pulley. I made around 850 hp but I was now maxed out at the fuel system.

We just swapped out the 1500 for the 2200. But we had to now work on the upgrading the fuel system. We swapped the high pressure pump with the Z06 pump, we used aLash cap and FSP also made an external secondary low pump setup to make sure there was enough fuel for the high pressure pump. At around 20lbs of boost I am now at 1050rwhp. BTW I am still using the stock injectors.

Like Higgs said I would possibly think about talking to another reputable tuner, one who has worked on these cars before.

If you want more HP (depending on how much you want) I would add a supercharger. That alone will get you around the 575rwhp mark, which is a perfect street monster. If you want to go higher a cam and headers, meth will get you to 700+ hp with no fuel issues.

hnaskoct

Thanks guys great info i appreciate it....Are there any awesome tuners out there that u guys recommend, but the thing is can they remote/email tune??? I can data log and go back and forth??

Bucknut2006

If you think about it, ECS, A&A and Procharger have sold a lot of kits that are running on stock fueling. The site would be full of horror stories if fueling was an issue. All of us crazy people swapping out pistons, cams, heads, pumps, injectors and adding meth are wanting to go well beyond 700hp.

hnaskoct

Yeah i had to ask because he was explaining all that stuff and basically trying to persuade me that its all facts lol

Matt @ FSP

We have been doing a tune of testing with Motohead's car as he had explained all the way from 585 to the 1050 mark we sit out now. Definitely been a learning experience on everything, but we are starting to bridge the barrier on the high HP parts and unknown issues LOL.

C7-Beast

I'm at 693 RWHP and have no lash cap and single nozzle Alky kit with an ESC Novi 1500 pushing 10 lbs of boost and I have not had any issues getting enough fuel. YMMV

Motohead279

Are you running a 10 psi restrictor plate?

c6switchblade

raising the desired pressure is one of the key things to making the car run properly up top once you start getting near that 30-33 percent duty cycle range

T/A KID

Switchblade I agree 100%
If you don't mind me asking how high of pressure are you pushing with the lash cap?
I'm about to install mind and was going to use a base z06 file and start close to that

C7-Beast

No restrictor plate. It was 95 degrees outside when mine was dyno'd so it maxed out at 9.9 lbs but expect 10.5 when conditions are more favorable. If you use a smaller pulley i've seen these 1500's make 13.5-14.5 lbs.

4GS7

Your tuner sucks. Tell him to GTFO and send your car to someone reputable.

FYREANT

There is plenty of truth to be said here. here it is: "The truth is, your tuner does not have enough knowledge or experience with the C7 for you to let him tune your car". Period.

Motohead279

Before I swapped to the 2200R I was using a smaller pulley on my 1500 and I believe I was at 13psi.

slesher

Lost my mind in Georgia (VengeanceRacing)and NJ (ECS) and loving every second of it.

Your right we are freakin nuts

EcoBrick Bob

The only thing your tuner said that was the truth is that you DON'T want to run out of fuel. A good tuner is your friend and will make sure that won't happen. Higgs numbers and remedies definitely worth considering if you're gonna play.

My only comment on E85 is that it takes somewhere between 30% & 50% more fuel capacity when tuned to take maximum use of the higher octane. The higher the boost PSI, the more fuel needed from my experiences with my TT Flex, when spraying Methanol with boost levels around 18 PSI. At least we have options with cam lobes, Z06 pump & injectors etc.... Ford, in their DI boosted racing engines & the new Ford GT, adds port injection to the DI system.