highspeedspecialist

Who here have the racetronix pnp with bap with stock line with a fmfpr and have succesfully at 650hp or higher? Lets here your feedback..

Slowhawk

iTrader: (12)

We've found the limit of that setup around 670-690rwhp.-safely

highspeedspecialist

kool^ any other users?

kp

iTrader: (34)

Well, hard to quote rwhp numbers without a little more info. I am at 520 rwhp and my racetronix, MSD BAP, front mounted regulator are maxed out.

But, I have a supercharger, TH400, 8" converter, HD steel driveshaft, 9" ford w/3.70 and slicks when I dynoed.

If you use forum math I would be ~620 with a 10 bolt/M6 radials plus figure 40 or 50 or so the blower is taking and there you go. Also dont forget that dynos correct up when its hot in the shop so even though you are putting out X amount of corrected HP on a hot day, when it gets cool and the motor needs the extra fuel you may come up short.

Anyhow, if you are planning on 650rw in a FI car just do the fuel system right the first time and be done with it. I put more money into this going from racetronix not being enough, to the BAP + racetronix + rails not being enough to the FMFPR not being enough either. I could have just bought a complete fuel system from speed inc and been done with it for the same to less money.

anarchy99

iTrader: (7)

I'm at the same problem right now as you are kp... bought racetronix then BAP, then nasty rails, haven't gotten the regulator yet, cuz I already know all that's not going to be enough... Is it possible to splice a second walbro into the racetronix plug-in harness and run twin walbro's without the BAP, or should I just sell my racetronix setup and BAP and get something else entirely? Sorry to thread hijack, but this one was already going.

kp

iTrader: (34)

I am going to try a dual intank next and ditch the BAP, I am going to run a seperate wire for the second pump down to the relay on the racetronix harness in case I want to turn it on and off with a hobbs switch down the road. I would do the regulator up front though, that made a huge difference and with dual pumps I would do it anyhow. I used the V6 fuel lines and a aeromotive compact regulator and it turned out real nice, I posted some pics in this section a few weeks ago. I'm a little concerned with the compact regulator handling the dual 255s so I dont want to wire them together in the tank.

It is also possible I just have a weak pump. I went with this because I was tuning a C5 (00 with the regulator in back) with the racetronix alone, stock lines and rails, and made 650rwhp with D1 @ 12psi easy so I was like this will be easy

anarchy99

iTrader: (7)

I haven't installed my Racetronix/bap yet, so should I just go ahead and modify it now with a second pump and get rid of my BAP, or send it to racetronix and have them do it? I'm trying for 7oorwhp.

kp

iTrader: (34)

I'll just pick up a couple new 255s and brass fitting/hose clamp it together - its easy on a 98. I'll sell the BAP and keep the racetronix pump around for another car - cant imagine a used fuel pump is worth much

highspeedspecialist

dang i wish i never purchase that bap but it was only $180 and it was nearly new... Well I guess I'm going dual for sure!!! Kp you think dual with stock fuel line will be ok for 650...hp?

highspeedspecialist

Oh btw you plan on keeping the regulator up front or at the back?

kp

iTrader: (34)

The regulator up front is a must, I will do fine with the stock feed line I think. If you already have the stuff may as well try it, I like to run my car around 11.5:1 in the heat so I am using a lot of fuel. Main reason I want to go with the dual pumps is so I can stretch my 57lb injectors out a little more.

Dual pumps running at the same time with the regulator in back is not a good idea from what I have read but I havent tried it so I dont know for sure.

anarchy99

iTrader: (7)

I haven't purchased my regulator yet, but I do need to get one. What regulator would you reccommend for a turbocharged car?

kp

iTrader: (34)

I am using the 'compact' EFI regulator from aeromotive because thats all I could get on short notice. I had a CAS from speed inc that looked nice but I didnt use it, I also had the bigger aeromotive A1000 regulator on my old car and they all worked just fine. I'm a little scared the the compact regulator wont handle dual 255s though, but aeromotive claims its good for 1000hp whatever that means

Racetronix

iTrader: (2)

Many people make the mistake of using a FMFPR and setting the base pressure at 4 bar / 58PSI. Under boost the fuel pump volume will drop off considerably much over 58PSI. To achieve the best o/p from the system it is best to keep the pressure down in order to maintain good pump volume.

It is odd how some people are able to get their Racetronix fuel systems to support high HP and others do not. It has nothing to do with product tolerance and everything to do with the way it is implemented. The details are everything.

Either way if you are planning on making 650-700RWHP FI it is best to consider a DP for safety margin.

VINCE

iTrader: (1)

Are you talking just FI? If not then my setup qualifies. I run a Racetronix Plug and Play and a KB Boost a Pump. So far I have not had to use the KB BAP yet. I have put down over 760rwhp on the spray with the fuel pressure dropping to low 50's. When it drops below 50psi I will use the KB BAP.

Racetronix

iTrader: (2)

The Vette is a slightly different animal.
This problem is more common with high HP (600RWHP+) FI motors as they are much more fuel hungry than NA motors.

kp

iTrader: (34)

i myself personally have tuned 99+ corvettes with D1SCs that made 650-660rwhp (m6)with a single racetronix in tank and no BAP. The C5s have 3/8 line going up like the rest and the same rails, may have a better regulator though.

Like I posted above you just cant give a rwhp figure since a car like mine with a supercharger thats takes 40-50hp to run, 8" converter, TH400, nitrous driveshaft, 9" ford rear and slicks is going to chassis dyno a ton less then a turbo car with a manual trans, stock 10 bolt and radial tires and use the same amount of fuel. Thats why you are seeing some people getting more power then others, if we all engine dynod and had the exact same BSFC then you could say well its good for 700bhp and be pretty accurate. Not to mention different brands of dynos vary and then you throw the whole correction thing into it.

I would love to run these 57lb racetronix injectors at 3 bar but they wont be enough. With dual pumps I'm sure the pressure will stay up

BTW, I'm not saying there is anything wrong with the racetronix setup, I have installed a dozen of them and they are a really nice piece and work as advertised and would recommend them 95% of the time but if someone is shooting for a forced induction 650rwhp right off the bat why fool around. I think you would sell a ton of dual pump assemblies Jack if you had info on your web page about them and some pricing - heck I'd probably buy one because it would be a work of art like the single..

Racetronix

iTrader: (2)

No argument with this. There are people who have setups which do not have all your DT loss and high BSFC but they still have trouble supporting 600RWHP. Properly sized injectors are just as important as a stout fuel pump system. Dual in-tank pumps can obviously support much more power than a single in-tank pump.

Wish we could offer the DP on a regular basis but they are VERY labor intensive to make and mainstream product takes priority here. Anybody who is lucky enough to have one quickly appreciates the quality and value they get for the money spent.

kp

iTrader: (34)

Unfortunate on the duals, I can understand the labor intensive and not wanting them to be high priority. Either way the single racetronix + MSD BAP ran 130mph @ 11.5:1 a/f in a 3500lb FI car so its doing the job - as usual I was going to be happy with 10.90s @ 125 or so when I first started so thats why I went single (plus the excellent C5 results I had) but you know how that goes - more more more

anarchy99

iTrader: (7)

Hey Racetronix, I still have my brand new, in the box racetronix in-tank setup for a 00' WS6 Trans Am. I know you guys are busy and all, but I'd like to know if there was anyway that I could send it back to you, still in the box, and have it converted to a dual in-tank setup? I'm not in the worlds biggest hurry right now, so not having my pump for a couple of weeks isn't going to kill me, but I am going to need a dual in-tank setup and I'd hate to chop up a work of art to do it. If you could PM me, I'd be your biggest fan!!!!!