menlatin

i got on partstrader.com and saw a few ecu's for sale that said 14.5 with eshaust intake and intercooler. im assuming that 14.5 psi on the stock turbos.. is that safe?? reason asking is that im trying to get a 93 r1, by the end of the year im hoping to have full exhaust, crank pulley, tkt cold air intake, boost controller. what psi do u think i can run with those mods? max and normal usage

GoodfellaFD3S

iTrader: (213)

I'd stay at 12 psi all the time. My R1's fast as **** at 10 psi. Why push it? I see you're in Denton; I plan on coming up that way in the next few weeks. If you'd like we can get together and go for a ride; I guarantee you'll agree with the "fast as ****" part .

PM me--

Dimcorner

i'm running about 13.5 - 14 psi on a 117k mile motor and it's good so far...

It's my daily driver and my mod list is below, I have had the pumped boost for about 1 year already.

ZoomZoom

iTrader: (2)

Stock Turbos can run up to 17 psi. Depending on what you cinsider safe thats debatable. Any time you increase boost you put more stress on the stock parts. Depending on the condition your engine turbos and trans are in I dont see any problem. 1 bar of boost. 14.7 psi. Is safe with a stock fuel system etc. I would make sure you didnt have any spikes of more than 1 or 2 psi. if so you may need to port your stock wastegate to dump enough exhaust as not to overboost and go lean. I see no problem runnign that much boost with a healthy car. Also the vacuum lines tend to pop off under higher boost applications so you may want to consider a tie wrap hose job to avoid that. As always cool down the turbos after they have been run hard. Shutting off the car and letting the oil "coke" inside the turbos will shorten the life of the turbos. The more psi you run the hotter they will get so this is very important with high boost applications to egt a turbo timer or cool them down yourself. Good luck.

Andres

when mine is finished beingg tuned iwth a wideband, i will be at around 14 psi street, and 18 psi cam 2 wit hteh stock turbos..

oh, and off to 3rd gen specific..

jimlab

Running more than 14 psi without race fuel is not safe on the street, no matter what your tuning may be, unless you've gone aftermarket with the engine management and the fuel system. You may get away with it, but that's the key phrase... get away with it. Some won't, and you can't base your settings on what someone else in a different state/climate/etc. is able to run.

Borderline injectors and a stock fuel system will quickly get you a blown engine, since at 14+ psi, most OEM ECU programs are pushing 90%+ injectory duty cycle and running dangerously lean. Yes, you'll make a lot of power, right up until you pop the motor.

The best bet is to stick to 12.5-13.5 psi on the street with the stock fuel system and a reprogrammed ECU. If you're on the dyno or at the track, run race fuel and increase boost to 14-15 psi at your own risk. 15+ psi on the stock turbos is a waste of time, because you are outside their efficiency zone, and you're making more heat than the extra boost is worth.

The best bet is to spend as much on the fuel system as you can afford and ensure that you're getting enough fuel to go with the boost. If you bought a used car or you're unsure of the condition of your injectors, spend some cheap insurance money and have them cleaned and flow-matched, or replaced. Add an aftermarket rising rate fuel pressure regulator (injectors flow more fuel at a given duty cycle if line pressure is increased, within reason) and an aftermarket pump. You don't have to replace the fuel lines, but it wouldn't hurt either.

Get the OEM intercooler and radiator out of the car. Your best bet is to keep the engine running cooler and you can do that by keeping water temp down (and oil), and by ingesting cooler air through an efficient intercooler. Get the pre-cat out of the engine bay, if you haven't already, and get a downpipe, preferably ceramic coated. And finally, invest in a good knock sensor. It's cheap insurance.

GoodfellaFD3S

iTrader: (213)

...I'd definitely go w/what Jim says menlatin. Once I get my M2 large IC/midpipe/Walbro fuel pump installed and dyno tune my Power FC (within a month) I plan on keeping boost around 12-13#. It's not worth going higher on stock twins, esp. if you're in my situation and just spent ~$6k for a new motor and assorted other goodies .

Rich

Malachi151

Screw it man, I'm staying at 12 psi, no higher. I've seen too many people blowing engines running 14-15 psi. I know it can be done safely, but it is increasing your chances for detonation. I think that below 13 seeems to be pretty safe. When you go over 12 it seems like the likely hood of blowing the motor goes way up.

Andres

i would like to keep it at 14 psi for a little leeway... i was running around on 10 psi.. and still blew my motor, so i'm not too worried about 14psi, specially cause i have the haltech, fully upgraded fuel, etc...

leeway, because when i was running around on 10psi it was pretty consistent, but then 1 cold night, it spiked to 12... not a bad spike, but if i was pushing 15 psi or 16psi, that could have been really bad..

oh, and my 18 on cam 2, well for those that don't know , cam 2 = race fuel..

Rix7

What about V10 klr? He says he's runnin' 18 lbs. on the stock turbos.

SPOautos

I wouldnt run over 13 unless you have a standalone computer system that is dyno tuned

or

race gas (good up to about 15psi tops)

The upgraded ecus do not have accurate enough tuning for your spacific car to justify pushing the limit like that.

However, you can run high boost if tuned right, there are some guys in the dyno tune section running very low 11's on te stock twins......way more boost than 15psi but they know what they are doing

Later,

FindYourInnerSeven

Some questions:

1. Does the pettit (and other G force style EPROM mods) ECU control the boost? Is it possible for the ECU to control the boost?
Or..is it set mechanically (via restrictor pills, etc)

2. Do you have to upgrade your fuel system (i.e. injector, FPR, fuel pump) with 14.5 psi? Or is it still possible to keep 13 to 14psi with stock injectors, etc?

WhtRocket

Ok I'll bite. I'd staya at 12psi until you have some fuel system upgrades and an IC. It is possible to run higher levels for a while. Your engine will blow soon enough. Why work at it.