SPOautos

Hey guys, what is the highest RWHP you've seen with the stock fuel system and stock turbos??? Does anyone have or seen a dyno run with all the standard bolt ons....intake, full exhaust, IC, computer at 14psi???????

Thanks,

RecKleSs

I talked to a few rotary shops and they said if you plan on running 13 psi or higher your fuel injectors should be upgraded. As of right now I have the stock fuel setup. However, the only thing I upgraded so far is my fuel pump.

Johnny

that's not exactly something you want to push to much...if you know what I mean... you have the PowerFC...look at you injectors %...something tells me at 14 psi you are already there.

GoodfellaFD3S

iTrader: (213)

I'm seeing ~90% running 13 psi. That's definitely as far as I want to go.

I have a friend w/a similar setup to mine running 15-16 psi and his inj duty is up to the 98% range. I told him to turn down the boost immediately.

Looks like a secondary injector group buy is in the works ...

SPOautos

Yea, what I want to do for now is tune for 14psi with race fuel/gas mixture to run at the track. I'm going to turn it down to 12.5-13 on the street.

I'm just wondering how much boost you guys have seen with similar setups???

GoodfellaFD3S.....I'm running 13.5 right now with my duty cycle hitting 90% but NEVER getting over 90%. Right now I'm basically running .92 boost (13.5psi) on the PFC with a .90 duty cycle. I figured I'll turn it up to .95(14psi) and throw in a little race fuel for insurance.

Just wondering what kind of power the stock turbos put down around 14psi???

Thanks,

GoodfellaFD3S

iTrader: (213)

I've been operating under the impression that 1 kg/cm^2=14.2 psi, thus .07 kg/cm^2=1psi. So .91=13 psi. This was discussed entensively in the Power FC section months ago and I believe that's the consensus arrived at. Looks like we're at about the same point as far as boost/inj duty cycle. Check out my mods; I feel w/dyno tuning in conjuction w/a wideband lambda O2 sensor I can make ~350 wheel hp on pump gas at 13psi. I'm also working on getting a rotary propack or other ignition upgrade.

It's looking like we're at the point where we need to upgrade our injectors or perhaps get a Fuel Pressure Riser.

--Rich

SPOautos

Yea, sounds like we are at the same point. I just mailed my Power FC to XS engineering and when I get it back I'll go to a dyno and see if it needs any "clean up"

I want to be able to run 350 RWhp at my dyno visit. I'm going to upgrade my fuel system but really want to wait a few more weeks. It just depends, I'm going to talk to the XS tuner when he starts in on my PFC and see what he thinks. If he says I'll need inj to hit 350+ I'll prob get him to tune for 1200 secondarys and mail some 1200's and a pump back with the PFC for me to install.

Later,

SPOautos

Oh yea, I think one of the engineeres from Apexi said that 1.0 or boost on the PFC is the same as 14.7

This was listed on the Lightening in a World of Thunder web site under the Apexi computers/Power FC......I cant remember his name though

suganuma

1.0 bar = 14.7 psi but the PFC is using kg/cm^2 and not bar so it equals out to 14.2 psi.

thats what ive been told at least

SPO....are you running an IC?
i dont see it on your list of mods, but recall you talking about selling a custom made one that you had designed....definitely need IC upgrade to run 350rwhp :p

RX7_RCR

Just something to consider guys. Would you rather spend ~$500 now for fuel upgrades, or $3k+ for a new engine later?

Personally, I wouldn't even think about raising boost with the stock fuel system. I'm not saying that it's not possible or you can't, but I wouldn't risk the chance, especially when you do HAVE the $$$ to upgrade. Now if you're really in debt, I would just wait it out and save for a bit.

Just be careful...a hint of detonation can kill a motor easily, especially a rotary.

artguy

I learned my lessun

upgrade your fuel if you touch the boost....

I was boosting 12.5 lbs...one good spike on a hot day at fontana two weeks ago and my engine was toast. now I have a 9.3.2 compression on the back rotor..

Im putting the 3mm ceramic seals in for better chance of making it thru a surprise detonation......adding the cosmo fuel pump..doing the dowel pinning...and finally upgrading my injectors...over the next two weeks or so.

dont do ***** til you do the fuel system...I figured that upgrading my ecu would do it...didnt work..now Im on one rotor and not on the road.

but I have learned my lesson...am doing it right to the best of my ability.

jason
94rx PEG modded.

SPOautos

Yea, I've got a IC but I havent changed my sig yet. I'm waiting to get everything done so I can get a new 1/4 time and update everything on my sig all at once.

What ecu upgrades and boost controllers are you guys with upgraded ecus running. I'm running a Power FC and can honestly say that I've NEVER seen a boost spike, not even in 15F weather running in 4th gear on the Interstate all the way to 140mph. The power FC controlls boost sooooo well!!!!! You guys should get one.

I;m haveing mine tuned by XS for 14psi but I'm only running that at the track with race fuel. One the street I'll be running 12.5-13 and that should be pleanty safe for the stock fuel sys. Thats only around 80% duty cycle.

95R2-89TII Ground Zero

I don't know what the more rwhp that you can get with the stock turbos and fuel system. But if you are playing with the boost, I would definetly do some work on the fuel system. If you lean out and cause detonation like I did on my TII, you will have a mess. Hell I can't walk outta my house without looking at my TII sitting next to the FD, and know that I screwed the car up because I was a dumb ***. I would definetly do some fuel upgrades asap.

KZ1

if anyone is really concerned with huge boost spikes, just get a pop off valve. I haev noticed that eth PFC is not as quick as a boost spike. I had one to .94 kg/cm^2. when limit was set to.90.

I am in ther same boat as Goodfellas and SPOautos, I have PFC running .90 at about 89% injector duty. I haev heard that just going twith a fuel pump helps as the stock one cannot maintain pressrue at high boost/high rpm. Is that true? I am thinking of either going 1000 secodnaries or raising the system pressure with nre regulator. I think it will coem down to price and drivability.

Goodfellas, how did you fuel pump install go?