Ravenrider1k

What’s the cost effective way you guys are getting the fuel system support for 800+whp on these cars without spending 10k on a fuel system

JasonVette

cost effective

Unless you doing port injection, you'll want a cam and some meth to hit 800+ whp. Or a cam and some injectors/hpfp

Kerviper

Port Injection is the most cost effective, that’s why GM also chose to do it.

I’m low 800whp on local dyno. Intake,Exhaust, Larger Supercharger, Secondary Port, Pump E85….have a larger Intake and TB to add next, motor has never been opened.

ZO6LIFE

I run sbe, stage 2 cam, stock intake, stock heads. Centri supercharger at 12lbs, FIC 1000 injectors, DSX aux pump, ZL1 fuel pump and fcm. Huge intercooler. This is on my '13 SS. It's bulletproof.

Kerviper

what are you running in your SS an LT1, LT4, or the LS3 it came with? The OP is asking about getting more fuel on a DI motor.

ZO6LIFE

Mines an L99 with VVT. (A6)

There's no such thing as cost effective when it comes to fuel systems. It's one of the most costly upgrades to make. I lucked out and the aux pump can take me right up to 4 digit power if I want.

Kerviper

That is still an LS3 variant and is a much “cheaper” and different ball game only having port injection……I have FIC 1000s on top of the factory DI , I have an Aux pump that feeds the secondary port and will boost the low side of the factory mechanical pump. My kit cost me 5k to 6k ish doing the install myself (I’m sure inflation hasn’t helped since I bought mine in 2019). It should be good to 1200whp of E85 (vendor claim) and makes this the best cost way to not have to mess with fuel upgrades for a while.

30% DI injectors, last I saw, were $2k alone, 65% were $4k, then you still need low side pump and cam with bigger fuel lobe to utilize them. That’s a lot more labor cost too if you don’t do it yourself.

TJay74

Your comment isnt even relative as you are comparing a LSx fuel system to a LTx fuel system, the only thing that is similar in the two is they both use a low side pump in the fuel tank.

To modify the LTx fuel system it is easily 2x to 3x the cost of the LSx fuel system. The LSx is a port injection setup where the LTx is a direct injection setup. DSX low side kit is around $1k, LPFP for the LTx is $1k, the LPE Big Bore HPFP is $2k, as said the FIC DI injectors are $2k or 4K depending on which ones you go with. This is all without including a cam with either a +32 or +38 fuel lobe, so that is $6k to $8k just to increase the fuel supply on a LTx/DI fuel system setup.

About half of that on the LSx system and you would have all you would need for 800rwhp.

BooSSted

Least expensive route: Cam w/32% or greater fuel lobe, lowside and full meth system.

More ideal way, yes you're looking at that 10K ish mark for either a port setup with fuel controller or stock system upgrades w/xdi belt drive high flow pump.
You can find some pretty good deals on used components.

SwampDog13

I went with port injection as well. After running all the numbers for +30 or +60 injectors, big bore hpfp, low side pump, and cam including labor I decided that if I was going to do it I was going to go all out and build my fuel system one time and have more than I’d ever need.

My fore triple in tank pumps with the 1000cc port injectors and Holley hp running it all I barely scratch the surface of their duty cycles at well over 900whp on E.

Ravenrider1k

So for 900-1000whp on full e85 how much am I looking at I plan to do cam anyways

9sec

1300 for cam/dod delte
600 for vvt dlete
5000 for 65% dfi
4000 high output hpfp
1000 for low side aux fuel pump setup
approx 11k

JasonVette

Why do you want to run full E85? Port injection is really the best way to run FULL e85 on these cars. But a blend with some meth even is much more cost effective and will get you the same power, and you wouldn't even really need to upgrade your fuel system so much past the cam and a lowside.

Ravenrider1k

Just a pain having to worry about filling one more thing and I hate runnning mixtures of pump gas and e85 unless I can do e85 and meth only but not have the motor dependent on meth Incase it stopped working

BooSSted

I was on the fence of building on the stock DI system with all the fuel upgrades now offered. Instead I went with port because it's a sure fire end all solution w/fuel.
I couldn't get a clean answer of what combo of +XX injectors, high flow this and that pump, would actually net enough fuel for 1K WHP. With port, you can just throw in some larger injectors and cut the guess work.

That said you could piece together a port system for 7-10K depending if you source some used items. Someone is always selling injectors and fuel controllers.

Kerviper

FYI
-Weapon X Motorsports SPI kit is just under 7k on their website, parts only. Crawford racing also makes a kit but I’m not sure what it will include but I remember it being cheaper.

If you are doing cam any way….30% Injectors with a 32% Cam lobe will get 750-850whp on E85, I’m pretty sure you would need a low side still though unless your car is a 2019 (then maybe not)…..from Xtreme-Di’s website…..but you will be maxed out at that point.

KD_Z06

What are you running for a low side setup? I have a similar setup to yours going in currently.

Kerviper

I have the Weapon X SPI kit, low side is stock except right before the braided connection at the engine. This is were the pump on the SPI T’s into to boost the low side and feeds the port.

It’s an AEM 400lph In-line External pump with a tank tap.

clekchaum

I’m at 826 rwhp with 2650 cam injectors cai headers no meth, no e85.

Kerviper

what did you do for low side fuel or is yours a 2019 with the ZR1 pump? I’m assuming you are using 30% injectors?