How much boost can one run on the stock twins for everyday driving reliability and still have a nice punch?

I currently have Intake, DP, and Catback. Boost gauge shows 10-8-10 pattern. I'm about to get Pettit ECU, SMIC, Hi flo cat. To take advantage to these mods I would like to run 12-10-12 boost if possible. My turbos have 88K miles on them and I got a new motor installed at 77K miles (coolant leak). Would that be too much for my turbos? I will still be driving the FD everyday so reliability is the priority. Please advise.

Thanks

 

depending on what condition your turbos and motor are in 12 shouldnt be a problem...if thats your original engine i woudl be a little afraid to run higher boost...a lot of motors give after 70k some run for 130k....

 

I've got full exhaust and intake on a stock ic, running .75kg/cm2, or around 10.5 lbs of boost.

 

There has gotta be more daily driver out there.

 

i have smic,intake,mp,dp,cb,and pettit ecu, i run 12 pounds, original engine and turbos at 60k miles

 

Just an idea, but if you were to get the profect B boost controller (after you purchase your ECU) then you could run 10 psi in daily driving situations and then, with the punch of a button, run 12-13 psi for those special occasions when you want a bit more boost.

 

I have been running 12psi daily most of the summer with no issues.

 

8 lbs of boost everyday, tooling around town.

12 lbs of boost to add some spice.


14 lbs of boost to remind myself why I keep it at 8 lbs of boost.

I have the switch for the different maps on the EFI PMC in the ashtray, so it is subtle, accesible, and hidden

With 8 lbs of boost, it is enough to spin the tires through 2nd, break them loose in 2nd, and enough to beat most cars on the street.

It is also much better for gas mileage, about 20% improvement versus driving at 12 lbs of boost. (but you shouldnt be driving an FD if you are concerned about gas costs).

I figure the lower boost and stress will be good for the turbos and engine, but since I can change on the fly, why not do it that way.

Cheers

thesaint

 

Thanks for the info everyone. I think I will get an electronic boost controller (thanks chaz) to keep my boost at 10 psi for everday driving and 12 psi max for messing around. Does anyone have the pettit boost controller? Any reviews on it? I think they make their own?

 

My daily driven FD I had 113k miles on the car when it was stolen.

First set up- 1 Bar of boost, Stock Twins, stock motor, GReddy FMIC, XS ECU, HKS EVC IV, DP, MP, HKS Hiper, KnightSports Pulley kit,

Second set up- 1 Bar of boost, XS T04S, stock motor(#2), HKS Type S FMIC, PFC, HKS EVC IV, DP, MP, HKS Hiper, HKS Twin Power, KnightSports Pulley Kit, 1300cc secondaries

I drove the car everyday as it was my only means of transportation...I never turned the boost down it was always at 1 bar.

 

my car is set at stock boost levels, it goes to 12 then to 10 on the secondary, i drive it evry day with 68 k, the motor was replaced at 56 k, i dont know about when the turbos were serviced

 

Used to run 13-14psi on stock twins daily, and 19psi on single turbo daily, never had a problem, but then again my car was tuned properly.

 

Granted I haven't searched on this, but what are the limitations of high boost? My understanding is that the first major limitation is fuel, but once that is taken care of, detonation on pump gas is the next major concern, right? That one's scary cuz I don't see how you know you're doing it until it's too late. The engine itself, will take most any reasonable amount of boost you throw at it, right?

The reason I ask is that I should be picking up my car with a newly rebuilt engine complete with a Apex RX6 single this Friday! I figured I'd run 13 or so on the street just to be safe, and 15 at races, but I wasn't sure where the limit is.......

Also, for what it's worth, my last engine/orig turbos were run at 12-13psi for their life. The turbos had survived without smoking for 120+k miles. The engine died because of a failed rear bearing, which shouldn't have been boost related. I think 12psi or so is pretty much the rule of thumb for a safe amount to run without having to worry about any damage.

 

I run 14 to 15 psi daily

 

I have 12 psi running on the stocks....and it seems to be fine.

 

I've run 12 psi for the entire time that i've had the car(3 years). I have a 10psi setting, but i'm really addicted to the higher power. I would probably be better off running 10psi.
Good luck
Jim

 

I drive mine daily. Its a 94 touring. The car has 92k miles, the engine and turbos have about 38k. About 5k ago the previous owner had the turbos taken apart and seals replaced. I think they were leaking oil.

The car has a downpipe and greddy SP exhaust. It runs about 10-8-12 depending on what gear I am in. So far no troubles.

-Charlie

 

I have the PFC set for .9 bar but it seldom makes it that high. Typically it will boost about .85-.87. The boost gage will usually hit 12 on the primary and 11 on the secondary. When I went over Tioga pass (9965 ft) it would still make over 10 psi

Mods shown in sig.

 

On 93 octane pump gas Pettit recommeds running no more than 12 psi of boost. They say anything above that would require higher octance race gas. Runnig more that 12 psi on pump gas would lead to detonation. I think pettit is a little conservative but I will stick with their recommendation.

 

14lbs daily....

j

 

do you run race gas or any additives?

 

13-13.5 daily with Advanced rotary ECU.

Quite satisfied!

 

While not a "daily driver" since I usually only take mine out once or twice a week, with only the minor mods listed below I hit fuel cut in cold weather, so I am boosting to 12 psi or a little above fairly regularly.