Is this spool @ 4k rpm right for td04h-15g or am I missing something ? I don't have the psi chart but it settles up to 0.6 bar soon after peaking to 0.8 bar. Actually I hate that low spooling and help would be nice :(
bone stock 1.6l -93
TD04H and Greddy manifold
Custom 2.5" dp
Custom 3" dp->back with magnaflow muffler , no cat
18x12x3" bar&plate china ic and custom 2" piping
Fuelab afpr running 60psi base pressure (vac line disconnected)
Mspnp, no maf
turbosmart bleed valve, basic ball&spring -type
Here's my .msq and dyno chart. Running 0.6 bar (8.7psi)
(I have some problems with greddy manifold bolts to loosen up but it wouldn't mess this much, would it ?)
I though so. Any ideas what would help the spool and what's wrong with that setup. Other than wg and loose studs...
I didn't answer as fully in the last post as I wanted to since I was rushed to get out the door.
Alot of people go with the hardest grade of studs they can find. That's caused shearing issues for me in the past, I think it's because it doesn't have as much tolerance for expanding and contracting with the heat especially when tightened down too much. They also become a pain in the *** to remove if they shear because of the hardness. I prefer a larger diameter stud with a softer grade of metal.
"Stage 8" (brand name) header bolts are said to be really good and haven't heard anything bad about them. I haven't gone that direction because I know I'd lose the retaining clips frequently.
If you are know how to use safety wire you know it's a pain in the ***, but McMaster-Carr carries several sizes of predrilled bolts in american sizes. Often you can get predrilled bolts in metric sizes from motorcycle racing supply houses. If you want to cheat Aircraft spruce carries saftey wire washers that fit under the bolt head and has tabs that fold up to grab the nut, one of the tabs has a hole you can run the safety wire through.
Sorry, I don't have megatune loaded on this machine, what's your timing map look like?
Naturally, I figure I can set down and throw this together in minutes and an hour later, here I am. Anyways, I transposed my dyno at almost exactly the same PSI onto yours. Mine spikes to 11 psi and settles at 9, which is identical to your spike to .8 bar (11.6 psi) and settle to .6 bar (9 psi). The red #'s are conversions to hp and ft-lbs.
As you can see, though you seem to spool only a bit slower than me, your spool is not that lacking. Really, your graph looks like slower spool than it is because of the scale of the rpms. P.S. Nice dyno man.
I very well may have the same poor connection as you did. So you changed to studs instead of bolts? I've never heard of nord-locks, looked them up and they look like they should do the trick - my normal lock washers don't seem to be working well enough.
what length did you go with for the studs? I'm going to get grade 10.9 studs and nord-locks, but want to get the right length or else I won't be able to fit the nut onto the stud once the turbo is on.