Update,
First and foremost, my apologies for getting this up a week+ after we were at the dyno. That said, thank you all for your patience. We are proud to announce a few breakthroughs in this update.
1. After years of testing on the return-less fuel system with the Walbro 255 LPH and Aeromotive 340 LPH fuel pumps, we wanted to see what the stock fuel pump could handle. Given the physical size and shape of it, we assumed it could flow enough to support "some" power...This is all speculation of course until we try it. We kept an open mind going in to the testing and were ready for the stock pump to run out on the first pull. First things first, we installed a fuel pressure gauge to the damper at the stock fuel rail tube. Now we are ready, Sebastian in the car ready to do the first pull on 91 octane, boost controller off, so we are basically on wastegate spring pressure. I am at the rail monitoring the gauge like a hawk! BOOM...run #1, the car performs flawlessly. We make 6.5 psi without a hitch. The fuel pressure did what we expected it to, it dropped. Though, it did not drop any more than it does when a Walbro 255 LPH fuel pump is installed. In fact, the fuel pressure dropped less! Reason being, the stock fuel pump is clearly smaller than the Walbro 255 LPH fuel pump. It draws less and demands less. Hence, less drop off in fuel pressure.
From there we turned it up, gradually and carefully, monitoring the parameters on every pull. We took the car all the way up to and slightly over 8psi. The highest we pulled was 467 RWH. Ok, experiment done, don't push it we said to each other! I will add to the discussion, we used a brand new fuel pump and canister from Nissan. The entire assembly will run you about $400. I had the other canister sitting standby retrofitted with the Walbro 255 LPH and FAST-500 return kit installed. Having the extra canister makes for a 20 minute swap. Conclusion...
If you are in the market for a FI TT Kit and only want to make 390-425 RWH, you can run the stock fuel pump. Here are the recommended stipulations:
The True Stage I- No boost controller (This will put you right around 6 psi +/-)
- If you have over 30,000 miles on your Z, replace your stock fuel pump canister. The higher mileage cars will cause the OEM fuel pump to reduce it's duty cycle strength. Note: I will reiterate, we tested this configuration with a new canister!
The list below is an average cost of what we factored the end consumer will save by going this route.
- Boost controller: $500-$1,000
- Labor on BC: $350-$500
- Fuel pump & related accessories: $150 (We will remove from the cost of our complete kit.)
- Labor on fuel pump and related accessories: 2 hours so about $200.
As you can see, the savings add up! In closing on this topic, this is a great start for the consumer on a tighter budget. You will leave the door open to add the FAST-500 and Boost Controller down the road.
2. The FAST-500 performed flawlessly as to be expected. This is not it's first rodeo after all. It is a very straightforward install and clean finished product. I have yet to release any teaser pictures but am hoping to have everything finalized within the next few weeks. As always, our finished product will not disappoint. As you can see from the dyno chart below, we were able to make just shy of 500 RWH on 91 Octane with ZERO detonation. The testing conditions were not the most optimal either. 105* in the dyno bay makes for a trying afternoon. Nevertheless, the fuel system works as advertised, increasing and holding adequate fuel pressure throughout the dyno run.
3. 100 Octane...Prior to this car, we have made well over 600 RWH with 3 separate cars. The common denominator, they were all running E85. We are proud to announce that this is the first car with our TT Kit to break the 600 RWH barrier on pump gas. Correct, pump gas! I got it straight out of a pump at $9.89 per gallon. That will make you think, the next time you complain about high gas prices! Again, due to the good fuel and adequate fuel pressure, we are able to raise the bar. The car performs like a top. From the Whiteline rear end urethane bushings, to the SpecialtyZ clutch/flywheel combo, to the EBoost 2 boost controller, to the FI TDX CBE.
Fast forward to today, I get good news out of South Texas. The boys @JMS Racing just tuned the exact same TT Kit and exhaust configuration (minus the HFC's) to 616 RWH & 532 FT LBS of Torque. This was performed on a 93/109 Octane blend. 2 Dots left on the fuel gauge of 93 and then 5 gallons of MS109. This car is also equipped with the CJM Stage I Return fuel system.
We appreciate the continued support and business from the community. We value the consistent and reliable knowledge and work from Sebastian @SpecialtyZ. He definitely makes us look good! I value my business partner and brilliant mind, Dan@ Fast Intentions, for never letting the hamster wheel stop in in head and always pushing for perfection. Last but not least, we thank our dedicated and hardworking team, Michael, Dan & Dan. Having you three allows Dan and I to continue to raise the bar.
Thanks to all.
Tony