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That muffler sounds great. I wonder what it'll sound like once it's broken in. Probably a little quieter outside too when there's no reflected sound from the garage.
That muffler sounds great. I wonder what it'll sound like once it's broken in. Probably a little quieter outside too when there's no reflected sound from the garage.
Thank you.
Agreed; I think it will be quieter outside. In-person, I like the deeper tones but there is a bit of a "spitting" component that sounds a little bit like "header tinkle" (or exhaust leak) but seems to be coming from the tailpipe. Hopefully that aspect of it settles down after some use. (or I figure out it's exhaust leaks and I fix those) Even so, doubt I'll hear it inside the truck or as much outside.
I guess I'm getting old. First time I messed with exhaust on a project and didn't knee-jerk, at least initially, to 2-chamber(yes; I know that's not technically correct but it's what we all called them) Flowmasters.
Have to reinstall the sway bar, move a couple of transmissions and 10 daiquiri machines that have since occupied the space behind it, then it's off for a road test.
Fingers crossed, I'll be seeing Geoff tomorrow and then perhaps dyno next week.
Definitely going to have to find somewhere else to stash some of the wire and build a little panel for the ashtray. More excess than I planned for but it all fits for now and will get me down the road I think.
Added one last piece; 1/8" nipple as On3 supplies 1/4" with their vacuum manifold and the gauge needs smaller.
After realizing the grille wouldn't go back on because of the intercooler. It was even hitting on the inlet/outlet so I predict this would have been somewhat an issue with their "standard(shorter)" intercooler. I sawed a few bits off and then realized there is an inner shroud that attaches to the backside of the grille face with about 8x 7mm screws. Next up was two ~1.5" square mounting bosses in the backside of the grille face. Chopped those off and it looks like a truck again.
Tuner asked me to keep it out of boost until I can bring it by but I still got to make some wooshy sounds on the way home. Laughed like a maniac half of the trip.
Hopefully tune tomorrow-ish and Dyno next week or so.
Driving it...making lots of whoosh sounds..but boost is hard-limited at 2.5PSI. I suspect the BOV spring and have ordered the "brown" spring from Tial. This is "-12psi, for vehicles with -21-23in/hg vacuum" which with stock cam this truck generates. A tiny bit above 23 most of the time, actually, by MAP reading via Torque.
I currently have the black spring which is "-6psi / -8-11in/hg" which I suppose is for a cam in the donkey range. It was what was in stock at Jegs when I ordered. Wastegates come with a pile of springs; BOV only one pre-installed.
Boost was also measured the same way because the #$ !@ AEM gauge software won't recognize the gauge. Also factory it comes set to display AFR and ethanol and not boost. So I need to get in there and change it to get a second opinion on the boost number as well. 🙄
What do you guys think about my theory on the BOV? Reminder: I have no boost controller connected to the WG and only the spring combo that should net 8.7psi there. Port connected straight to intake manifold(behind TB) reference.
The BOV has nothing to do with the amount of boost you can make. It'd held **** 1:1 with boost pressure on top of it as boost comes up. A soft spring in it will just keep it open all the time at idle.
The WG is what controls the boost. If your only getting 2.5lbs with your spring selection of 8.7, you either have a lot of back pressure in the exhaust or you forgot to put the valve seat (fire ring) in the wg housing and its leaking a tone of exhaust past the valve.
I just reread your post and you're using the stock MAP to read boost?? It can't see boost, that's why it's only going to 2.5psi. Unless you've changed it, it's only a 1 bar sensor and you've maxed it at 2.5psi. You need to get a gauge working in there to see where you are really at.
I just reread your post and you're using the stock MAP to read boost?? It can't see boost, that's why it's only going to 2.5psi. Unless you've changed it, it's only a 1 bar sensor and you've maxed it at 2.5psi. You need to get a gauge working in there to see where you are really at.
DUH. I've been playing with some LSA/ZR1 stuff lately and have some of those sensors around and just assumed that the new stuff was the same. Fail on my part for sure.
AEM also pointed out that there is a different software download for the Failsafe/Wideband/Ethanol vs. Failsafe/Wideband gauges. Having an end-user kind of day today.
So throw me a consolation prize perhaps: Am I at least on the right track getting the right spring in the BOV or is that a waste of $30?
Jan 10, 2018 | 05:39 PM
I've been playing with some LSA/ZR1 stuff lately and have some of those sensors around and just assumed that the new stuff was the same. Fail on my part for sure.