Some interesting results from the GEN 5 fuel system

[vortechc5@A2B Motorsport]

This summer I've been testing how far our fuel system on the Gen5 can be pushed and I'm pretty impressed.

Since my car is a 15 1LE it came with the ZL1 pump-so with a set of 90lbs injectors and single nozzle meth kit and supplied ECS BAP I was easily able to make 740 rwhp-but the real test was on the street and track-that's where the real load is.

So a week after I installed the ECS kit I took the car to Smith Falls and ran 150mph in 2310 feet, 330 feet less than the half mile.

My duty cycle was 78% at 7000 rpm and pump pressure dropped from a commanded 58 to 48 psi.

So even thought the pressure dropped the system still was able to maintain the AFR commanded and still be safe.

So of course I wanted more so I opted for the 3.45 pulley which led to a power jump of 814 rwhp. With the same fuel system the duty cycle jumped to 88%. Fuel pressure dropped from 58 to 46-still the system was able to maintain the AFR I commanded. It was safe but the headroom just got smaller.

Now I wanted to try the FPCM's that come with the ZL1's-these allow us to increase pressure over 58 psi. Unfortunately you can't just pull one from a ZL1 and pop it in since it the ZL1 uses a E67 pcm-swapping pcm's was an option but ADM makes a modded FPCM to work with the E38-easy breezy.

Voila-the fuel pressure commanded now is 65psi and the system is delivering 63 psi at 7000 rpm. Duty cycle is now only 66% at 7000 rpm-and the AFR is where I'm commanding it.

So basically out of a stock system and 90lb injectors we are over 800 rwhp with room to go even further yet.

So for the cars that don't have the ZL1 pump-swapping is a simple upgrade and pumps can be had for around $300. The ADM FPCM can be had around $225-add an injector and 800rwhp can be done pretty simple without killing the bank.

And if you wanted to keep it even simpler-you could just add the FPCM to get more out of the stock pump.

Guys always ask me what injector and the simple answer is the biggest you can afford-the Bosch 90's we use are only $570 US and there plug and play-no adapters to connect or fail-and after tuning they drive perfect. So if you have a ZL1-just skip the popular 60's and go straight to the 90's. One and done.

I'm pretty impressed with this fuel system-no return line and 800 rwhp is pretty impressive. GM really did a good job with the pump and FPCM setup.

So if your making fuel system decision this offseason-this bit of info may help.

[fif_gen_powa]

Very nice, thanks for sharing. Did you leave the Boost a pump in or remove it when you added the ADM fpcm?

[vortechc5@A2B Motorsport]

Originally Posted by fif_gen_powa

Very nice, thanks for sharing. Did you leave the Boost a pump in or remove it when you added the ADM fpcm?

I left in there since It was all wired in-if I was starting over I probably would of just done the ADM FPCM first.

[Outlaw77]

So what's the limit with the stock SS pump? Not the ZL1 pump.

[vortechc5@A2B Motorsport]

Originally Posted by Outlaw77

So what's the limit with the stock SS pump? Not the ZL1 pump.

I have a car here making 700 rwhp with the stock pump and dual meth nozzles. Duty cycle was 78%. if it had a FPCM-it easily make more-bigger injectors-even more-this car only had the Deka 60's as well.

The only negative I have heard is that the 10 pumps don't like the higher pressures for too long.

[CanadianSS]

I totally agree on the injector size. I went straight to id850's and did a ZL1 pump & ADM FPCM. When I added them, I went to a 3.4 pulley for my SLP blower. Since then I added a cam, meth, and 3.0 pulley. When tuning time came, I didn't have to worry about fuel. I nailed 676 whp & 611 wtq!
Now I need tires lol

[Trackman]

The numbers are a little skewed when you add meth to the formula.

[ZYBORG]

Thanks for sharing Vortech,

In your opinion, what would be the route you would go when going e85 conversion on a 2014 1LE (LTs, cai, ported TB). Would the FPCM be able to pull this off on stock injectors safely? If not, what injectors would you recomend?

[vortechc5@A2B Motorsport]

Originally Posted by Trackman

The numbers are a little skewed when you add meth to the formula.

Trackman-I agree 100%.

But I do have some data without meth which should help.

730 rwhp-no meth, bap, 90lb inj-duty cycle is 88%, IAT was 133 degrees at the end of a dyno pull.

So meth was basically worth a 10% drop as indicated by my first post.

I actually I did not want to use meth but the IAT temps concerned me and meth was the only answer to cure that other than building whole new intercooler.

I didn't want to chance the hi IAT's at a runway event with a stock motor and pump gas so meth was my solution. I've been using it for 10 years now on my last 8 second C5 to this car and when setup correctly has never let me down.

[vortechc5@A2B Motorsport]

Originally Posted by ZYBORG

Thanks for sharing Vortech,

In your opinion, what would be the route you would go when going e85 conversion on a 2014 1LE (LTs, cai, ported TB). Would the FPCM be able to pull this off on stock injectors safely? If not, what injectors would you recomend?

Zyborg-I wish we had E85 up here but we don't. If we did I would be all over that stuff.

Just like I stated earlier-run the biggest injector you can tune in properly-especially if your going to use E85, and there are plenty of 1500-2000cc injectors out there now. I know F1C has a good 1500cc injector that would probably be perfect for a stock pump since they don't like hi pressures.

The bigger the injector the easier it will be on your pump.

[ZYBORG]

So Im guessing you wouldnt chance it on stock injectors with only the mods I listed (LTs, cai, ported TB) on a 1LE car? Would stay well below 500rwhp.

[vortechc5@A2B Motorsport]

Originally Posted by ZYBORG

So Im guessing you wouldnt chance it on stock injectors with only the mods I listed (LTs, cai, ported TB) on a 1LE car? Would stay well below 500rwhp.

No-my duty cycle with the same mods was 68% so E85 would need more injector for sure.

410 rwhp-68%

470 rwhp-78%

Hope this helps.