PT54 am I running out of air?!?!?!
- Thread starter Grandnat
- Start date
It is official!
I wired it shut and boost did not increase any.
20-21 psi with 24 degrees of timing
so the turbo is maxed out at about 20 psi.
I did run a 6.77@102mph with that tune tonight.
and I did it on DRAG RADIALS
I think that equates to a 10.4 -10.50 in the 1/4.
I wired it shut and boost did not increase any.
20-21 psi with 24 degrees of timing
so the turbo is maxed out at about 20 psi.
I did run a 6.77@102mph with that tune tonight.
and I did it on DRAG RADIALS
I think that equates to a 10.4 -10.50 in the 1/4.
I have a precision .85 exhaust.
the rest is
TH400 / 3500 art carr
GN1s unported.
212/212 hydraulic flat tappet
shifting at 5400 rpms
stock throttle body and headers.
RJC Powerplate
CAS V2 FMIC
F.A.S.T.
single walbro 340
83# injectors.
3" THDP
Tuned by yours truly
oh and column shift with leather seats
Are you absolutely sure that you dont have a pre turbo exhaust leak? Have you also closely checked out all of the intercooler hoses ? I always thought a loose intercooler hose would make a heck of a racket. But this is not so. If this has been going on for a while you may not notice it as you have been familiar with how it sounds.
I am probably not 100% sure Louie, but as best as I can tell everything is fine.
I did 102.3mph in this pig (3700#)and I just think that is all the PT54 has.
This is a relatively TINY turbo for the MPH I am pushing.
I did 126.58 mph with only 100mph inthe 1/8th on a previous run.
I am doing over 102.3 now and I expect the 1/4mph to be near around 129-130 mph
I just do not think the PT54 can go any faster with this heavy of a car.
I am thinking about the 71GTQ now. or the TSM 70
any opinions.
Well if it is my boost gauge it is also my 3 bar map sensor and my fuel pressure gauge.
They are all indicating 20 psi and they ALL have 3 seperate refference points.
not to mention I can run 18 psi on straight 93 pump gas
if my gauge was reading low I do not think I could do that.
why is is so hard to believe that I am just out of turbo?
How fast is fast enough with a PT54?
nines? LOL
Well, only 20-21psi is very hard to believe! Maybe on a BBC, but not on a 231".Again, I can easily see 30psi, and that is not the end of mine. Both turbos have a 61mm compressor wheel, and a 69trim turbine wheel. I am 99%sure about that. You must have a leak somewhere. Intake manifold, intercooler, etc.
Thats my opinion, get some more.
With your combo, I would expect some high 10s.
Thats my opinion, get some more.
With your combo, I would expect some high 10s.
you said bone stock motor...
thats the difference!!!
Boost is a measure of restriction... and on stock heads your 30 psi is probably close to 18 psi on my heads.
a stock GN turbo will make 100+ psi on a lawn motor..... and maybe 5 psi on a big block.
get it?
you do not measure a turbo by the boost it can make, that is irrelevant.
You measure it by the CFM or Lbs/min or the horsepower it can produce.
boost just gives us a comparison point and assumes that all else on the engine is equal.
notice you made 30 psi and only ran low 11s with a good 60ft... I am making alot more power, and with 10 psi less.
you have more restriction.
the question you should ask yourself is..."how much power can be made with this turbo?"
then you will see that I am clearly "out of turbo".
put down the glass of hateraid for a second and answer this simple question
How fast do you think is possible on a PT54/TE61?
once you answer that.. look at my times and decide if I am or am not maxing out the turbo.
forget about boost... I do not care what boost I run, just how fast it goes.
I know what my boost is without a doubt. I have THREE independant refference points.
