R50/53 Rebuilt R53 Motor and Timing Chain Concerns
#1
Rebuilt R53 Motor and Timing Chain Concerns
So just rebuilt my R53 motor and even though I triple and quadruple checked my timing chian marks, what would happen if I skipped it by a tooth?? I started fresh with a new chain so I had lined up the 2 arrows on the crank sprocket and the one on the cam sprocket before buttoning up the front cover. I heard if it was off it would have loss of power and hard start ups, but it certainly fires right up, no loping, and it builds more power as the new pistons seat themselves. BUT, if I run it for awhile, turn it off, then restart it warmed up, it starts right up but then it starts to lope and then smooth out. Is that a timing issue or possibly ignition or fuel? It's not throwing any codes so nothing is freaking it out, but for peace of mind I'd like to get some input if anyone knows what a timing chain off by a tooth might do. Thanks!
#3
Actually brand new injectors from RMW so they hopefully aren't messed up. I'm gonna start with fuel pump and filter since they've never been changed since I bought the car new. Might just be starved of fuel. Hopefully that fixes it.
#4
I would recommend diagnosing the problem before you start just throwing parts at the car.
You need to watch your smooth running values, fuel trims, have you checked your fuel pressure at the rail? Compression numbers?
What stage of tuning are you in? Have you done your final tuning, or are you still doing your base mapping? The car will run better and better each step you take in the tuning process, but will start off with quirks like you're describing.
You need to watch your smooth running values, fuel trims, have you checked your fuel pressure at the rail? Compression numbers?
What stage of tuning are you in? Have you done your final tuning, or are you still doing your base mapping? The car will run better and better each step you take in the tuning process, but will start off with quirks like you're describing.
#5
Ditto, fuel pumps rarely fail, you'll probably just be throwing money away.
And Nick is probably right, sound more like an actual tuning issue, there possibly may need to be some new injector scaling simply because of the difference in the way new parts are working together as opposed to the old ones.
Talk with who tuned the car originally and see if you can get them some data logs.
Remember, custom tunes work by optimising settings for the parts that are working on that car at the time of the tune, if you change any of the parts, esp. major ones, it may effect the tune itself.
And Nick is probably right, sound more like an actual tuning issue, there possibly may need to be some new injector scaling simply because of the difference in the way new parts are working together as opposed to the old ones.
Talk with who tuned the car originally and see if you can get them some data logs.
Remember, custom tunes work by optimising settings for the parts that are working on that car at the time of the tune, if you change any of the parts, esp. major ones, it may effect the tune itself.
Last edited by BlwnAway; 06-17-2016 at 12:24 PM.
#6
Ditto, fuel pumps rarely fail, you'll probably just be throwing money away.
And Nick is probably right, sound more like an actual tuning issue, there possibly may need to be some new injector scaling simply because of the difference in the way new parts are working together as opposed to the old ones.
Talk with who tuned the car originally and see if you can get them some data logs.
Remember, custom tunes work by optimising settings for the parts that are working on that car at the time of the tune, if you change any of the parts, esp. major ones, it may effect the tune itself.
And Nick is probably right, sound more like an actual tuning issue, there possibly may need to be some new injector scaling simply because of the difference in the way new parts are working together as opposed to the old ones.
Talk with who tuned the car originally and see if you can get them some data logs.
Remember, custom tunes work by optimising settings for the parts that are working on that car at the time of the tune, if you change any of the parts, esp. major ones, it may effect the tune itself.
#7
Yes, coil pack and plugs will be a good place to start, and since you've talked to the tuner then it may be something else, I didn't want to see you just throwing parts at it, without talking to them. But I still would possibly look into finding a fuel pressure gauge before replacing the pump, in the open line you should see a constant 60psi or so, "I think" (it's been a while) it was about 45psi at idle off the fuel rail.
It wouldn't hurt to change the fuel filter, no matter what.
It wouldn't hurt to change the fuel filter, no matter what.
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#8
Yes, coil pack and plugs will be a good place to start, and since you've talked to the tuner then it may be something else, I didn't want to see you just throwing parts at it, without talking to them. But I still would possibly look into finding a fuel pressure gauge before replacing the pump, in the open line you should see a constant 60psi or so, "I think" (it's been a while) it was about 45psi at idle off the fuel rail.
It wouldn't hurt to change the fuel filter, no matter what.
It wouldn't hurt to change the fuel filter, no matter what.
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