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Soft timing is good, plug looks good. Was that on "big boost" ? Also if it wasn't a full 1/4 pull, it will get hotter. Figure out your issues before throwing timing at it. Should always be the last thing you once the car is running perfect IMO.
Id look at the converter slip. Lower the RPM the more slip there will be. Your RPM seems low for one. Stop babying it RPM wise and rev it out to 6800-7000. Then calculate slip. If it won't pull that kind of RPM, try to figure out why. What kind of RPM do you see at the end of the 1/4?. Calculate what speed you should be at with Tire size/gear/rpm. Then see where your really at. Calculated the difference between the two. Should be 6-8% or less.
Got the car on a decent dyno place, with the s475 17psi only made 430rwhp, after they checked heat spots out everywhere realised one od my mufflers was ******* all up , so chucked on a elbow bottom of dump pipe boost to 20 and made 580rwhp.
but witht the exhaust back on , we are only making 510rwhp @ 16psi
he thinks should be closer to 590 @ 16psi but the gate opening is creating a turbulent wall at the bend , and possibly the bend even on its own creating problems . 3.5" pipe.
also he thinks 16psi 550ish safe limit for gen3 gear .
finally current timing on tune ,
common for single number input ?
did seem odd why hes done it like that , but does pull just as good as it did before when i had it ramping from 26 to about the same @ 16psi.
i can get someone easy enough to dump the wastegate down , but the dump from the turbo is limited for room , i dont want to fix it and just be restricted at say 410rwkw now
That's a massive WG for what your doing! Is that a 60mm with 2.5" exh pipe? You'd have ALOT more space with something more appropriately sized IMO.
Sounds like the tuner is grasping for straws if he's blaming a free flowing 3.5 transition to 3" for an 80whp loss IMO. It's not ideal, but that seems unlikely to me, esp at the power levels your talking. I'd *think* even straight 3" would easily support those power levels without huge losses like that. I've worked on S475 T4 setups with a 3" 90 right on the outlet and had zero issues making power "normal" power per pound. You might have other issues... Maybe the same issues that were causing your S480 to spool so slowly?
Last edited by Forcefed86; Jan 15, 2021 at 08:16 AM.
That timing table is a mess. That’s why it’s lazy. I’d find a new tuner. Anybody that sets up a timing table like that shouldn’t be touching anyone else’s car. That guys feedin you a bunch of BS because he doesn’t know what he’s doin!
That timing table is a mess. That’s why it’s lazy. I’d find a new tuner. Anybody that sets up a timing table like that shouldn’t be touching anyone else’s car. That guys feedin you a bunch of BS because he doesn’t know what he’s doin!
I agree response could likely be improved. But that doesnt solve the final power numbers at 14* and 20lbs. Should still be higher... assuming the trap speed falls inline with the lower numbers.
That timing table is a mess. That’s why it’s lazy. I’d find a new tuner. Anybody that sets up a timing table like that shouldn’t be touching anyone else’s car. That guys feedin you a bunch of BS because he doesn’t know what he’s doin!
Why not just throw a cutout in if there is concern about merging the wastegate with the downpipe. It's not idea but it should be making more at that boost level even with the glide and 28s.
Yeah Ive taken the pipe out, gonna just vent the gate to the ground.
See how we go with that one.
Need some better tires now to really see what's going on. Slowly getting it worked out, spools up pretty quick once in positive pressure, I think from 0.5psi to 17psi is less than a second.
Its just bit slow to transition from wot into positive pressure.
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