Ravenous T\A

iTrader: (12)

I have been kicking around the idea of goin over to the FAST EFI 1450 TB system but according to the ad its for engines upto @600hp, i'm doing 420rwhp and using a 30% drivtrain loss I should have about a 600hp @ the crank right? I have a TH350 so I was told the drivetrain loss is about 30% plus here in a few I will be spraying about a 200 shot. Whatta u guys think?

jmill96Z

iTrader: (3)

You can look at the FAST, or Accufab TB. Either will support what ou are looking to do. I don't know what the FAST flows, but my Accufab 4150 flows around 1200 CFM

white84z

iTrader: (1)

If you read the Fast system it strictly says no power adders. Its an Awesome ecu, but it cant make adjustments for power adders fast enough to keep things from going boom.

ZONES89RS

iTrader: (25)

30%? That is just an assumption, but a 600 HP motor putting 420 gown? Maybe with a raggedy *** huge stall converter, you usually lose about 60-120 HP to the back tires, depending on the trans and rear. Otherwise, a lower HP engine loses 30-60.

72VenturaII

iTrader: (32)

Actually the company line is no power adders. One of the system designers said that nitrous is possible as long as you adjust your WOT A/F ratio to around 12:1.

Ravenous T\A

iTrader: (12)

4000 Stall Nitrous Converter with 3:73 Gears in a 8.5 10bolt?

ZONES89RS

iTrader: (25)

N2O converters are usually tight, but if you are running anything cammed with 5.7 or more cubes, i would assume 420 to the ground would be about 500ish to the flywheel. No way to be sure without a actual engine dyno, or run the car at the track and measure the MPH and weight on a HP calculator to get a "estimation".

Ravenous T\A

iTrader: (12)

I was just goin by what this sponsor on this thread mentioned to me about drivetrain loss using these old style non lock tranny's. 30% is what I have heard from a couple of shops I have talked to after my 1st intial dyno was givin as a average number drivetrain loss for a high stall Th350/Th400 compared to more modern transmissions and manuals. Wish i would have kept the PM from straightline cause I think he mention that figure too as an average loss but its been a long time as u can see from that post date

https://ls1tech.com/forums/dynamomet...hat-could.html

ZONES89RS

iTrader: (25)

You cannot really put a percentage on it, can be right on some times, or WAY off. Automatics dyno funny with large converters, they should only be used for tuning, the track is where you find out what kind of power you are making.

Ravenous T\A

iTrader: (12)

Yea I was just using that percentage as a rough guess.

BanditDave

iTrader: (11)

Someone mentioned that as long as you run WOT at 12:1 you will be fine but it is my understanding (I could definitely be wrong here) is that the system allows for some tweaks, but WOT and idle A/F are preset and unmodifiable from FAST.

This system is a fantastic system that I am using on my 6.0 LS '69 442 build, but it will be NA only. If you want to still use the carb style intake, go to something more appropriate for your build like a FAST XFI, etc...

Good luck!
Dave

72VenturaII

iTrader: (32)

A/F ratio is preset from the manufacturer, but is fully adjustable for both idle and WOT (I have the system instructions right in front of me) and it is recommended that you adjust them for optimal performance. You can also reset them on the fly, like when you are cruising on a long highway run and want to improve fuel mileage.

I'm about to install the EZ-EFI on my 355 SBC and for the money I think the system is one of the better carb replacement systems around.

The iron block 408 is my next project.

BanditDave

iTrader: (11)

Good to know...thanks!

HPM

I too was considering this. The guys at fast have customers running them on 700+hp motors. The injectors are 88lb/hr and guys are running them @ 70psi to get them to support this much. 70psi is a bunch but I have seen guys run more. The TB flows 1000cfm so it should support it. In order to get it to support any more than 600hp you will have to buy the kit w/o the pump and regulator. An A1000 should do the job easily. Good luck with your decision, sounds cool. Here is a great calculator to play with injector and pressure sizing

http://www.rceng.com/technical.aspx

white84z

iTrader: (1)

Imo Their multiport setup is a much better buy. 800 or so $ and can support 1000 hp is what is claimed. Im going to run this setup with a msd 6010 on my baby cammed 5.3, this way no matter the mods i will most likely never out gro the system.

Ravenous T\A

iTrader: (12)

U got a link to that kit or is that a special order thru them?

HPM

Part # 302000 direct from fast

HPM

http://www.compperformancegroupstore...Category_Code=

HPM

I have sold both and customers have been very happy. If you are making under 700hp, inho the TBI unit is awesome...over that and it's time for MPI.

HPM

We are also getting ready to put one of the new Proffesional Products Powerjection III's on. Hope it works as well.