Printable View
hey guy just got my car back not long ago from getting it turbocharged and realised that there is greyish smoke coming out of the exhuast wen i put my foot to the floor. anyone know wats causing it?? and btw as well as wen my car is in 1st gear. wen im just cruising no greyish smoke
is it not unburnt fuel??/u should have a realy rich tune under WOT and close to 14.7 A/F in closed loop
huh done really understand wat u saying
Quote:
Originally Posted by CUL8R
ok....under mild load,u should have an A/F ratio of about 14.7, this is called the stoiciometric (spelling?) ratio. a very high percentage of the fuel will be burnt. this is why at cruising u dont have smoke
when tuning a turbo engine to safeguard from detonation/pinging ect. a tune A/F of prob low 12s for ur higher loading cases, like u say wide open throttle. this leaves alot of unburnt fuel expelled from the exhaust and thus u see smoke
so is this normal?? how can i fix it
Quote:
Originally Posted by CUL8R
its normal dude, u dont want blue smoke, thats oil....ur fine
thanxs
i just hate it coz makes my car looks like got problems and hate it
i was thinking of the turbo or the rings thats causing it
Quote:
Originally Posted by CUL8R
I have never seen a well tuned turbo car blow smoke at load. I would seriously consider anyone telling you it's ok.
How many stock turbo cars do you see smoking under load? None. They still have to run the rich a/f ratios.
There's a bigger issue occuring here.
What kind of tuning has been done? New or used turbo? Kit or diy set up?
Generally when I see smoking in a new turbo set up, the first thing I look at is the placement of the oil return line.
yeah ok listen to him!!! lol
the only thing i wonder is, my cars all na...hell all stock preludes are na....and they all blow smoke because of a rich tune....since i got my standalone ecu and had that tuned it blows more due to a richer tune.....i woulda bet money on it not being a problem but i suppose u should listen to saxman.....i dont have alot of experiance with turbo
Well black smoke is fuel, you were saying grey smoke. Generally white smoke is coolant, blue is oil, black is fuel.
I doubt it is anything major. I've seen a H series lose its rings and you definitely know when that happens. Oil return is a possibility, or running a ball bearing turbo without restrictor is another possibility. A bit more info on the setup would help, along the lines of what Saxman asked. Was it a kit, what turbo, ECU etc.
CUL8R: you have a richer tune than stock since getting a standalone ECU?? You do realise that the stock ECU runs quite rich under load and that the standalone should be running leaner than stock.
im like 13.4Quote:
Originally Posted by poid
we did lean it out but my car responded better when given more fuel. 13.4 was optimal
hey filoaccord,
i agree with saxman, my car had the same problem and it was to do with the oil return line, hoses that were goin to the catch can were ****ed around with, check urs out.
13.4 isnt rich though ;)Quote:
Originally Posted by CUL8R
i've seen AFR's in the 10's on a stock ECU at high load/high rpm.
here is the setup
Precision sc61 turbo rated at 680hp (usa specs) similar to gt35
- 61mm front wheel and .86rear housing
Custom s/s turbo manifold and hpc coated
Rc eng. 450cc
Tial 38mm wastegate
Custom intercooler kit
Full 3'' exhaust with screamer pipe
Microtech ltx8 ecu
Quote:
Originally Posted by poid
well my catch can is connected to the beather at the back of the engine, a hose running it to the catch can and other hose running on the air fliter connected tot he turbo is that correct
Quote:
Originally Posted by [SDCTVE]
this is a used turbo
Quote:
Originally Posted by saxman
why are you running an sc61 and only 450cc injectors?
How much boost are you running?
Are you losing any coolant?
Any shaft play in the turbo? Picture of your return line?
Pull one of the intercooler pipes before the intercooler and check for oil film in the charge pipes.
sounds like you got the catch can set up right.... im not too sure about that smoke..... although mechanics have told me a bit of blow by wen i floor it is normal.... it doesnt sound like its anything to worry much about....
possilby check your oil return line and make sure that it isnot drilled too low on the sump
Charlie's old set up correct?
if charlie = chubs you are correct ....
im only running boost under 8psi and im
not losing coolant at all. will post a pic soon
i will check the intercooler for oil and if there is wats the prob??
Quote:
Originally Posted by saxman
if you've got oil in the charge pipes, the issue is with oil getting past the seals at the turbo... either as a result of blown seals from the turbo being used, or an incorrectly installed oil return line... or a combo of both.
also, why are you running an sc61 on an 8 psi set up? There are MUCH more applicable turbos for that boost range that would give you a way better powerband and have the turbo running much more efficiently.
He bought a 2nd hand kit off a guy with a fully built motor.....
so the oil line could still be installed wrong or the seals could still be blown... doesn't change anything
i was referring to what you were saying about the turbo ;)
Any of you guys have Charles contact details still?.. Pm me if u do, Cant get hold of him!!
you the guy chasing him about a motor that never got ur way? Dave told me..:(
yeah dude... people can be so kind can't theyQuote:
Originally Posted by honda_b_blastn
did a compression test and got 200psi on 3 cylinder and 125psi on the other. i think it might be the rings or valve anyone know?? is it worth fixing it or just buy anohter engine. anyone know wat cause it
leak down test would tell you if it's the rings, which valves, etc if the place that does it is competent.