These sound about right. Try to see If the one next to the supercharger has the same size as that of the one on the supercharger its self. I'm assuming your lower idler on the supercharger side is stock 2.5". Let us know the part numbers of your belts on both sides.

Are you talking about the jackshaft pulley? If so, I can guarantee it hasn't been changed because if it had whoever changed it would have had to add a spacer to the sc pulley to compensate for the different offset of the new Vortech jackshaft pulley. I'll bet it's the stock 3.2.

Really hard to tell with it still on the car but it appears to be the same size as the one on the supercharger, definitely larger than 3". I really doubt there's a restriction in my exhaust, but who knows anymore. If I'm making almost 13psi at 7,100 rpm before it starts to fall off (because of either boost leak or belt slip, or both...) I can't even imagine what it would be trying to do if it hit redline at 7,700rpm. What the hell lmao

I'm sure it a 3.2, same as the sc. If it had been changed you'd see a spacer on the sc shaft in order to space the sc pulley out to match the offset of the new jackshaft pulley.

After I got my belt slip stopped, my car hit peak boost at 7400rpm and max power at 7300rpm.

Yeah I do think so. Always good to check more details. I'm thinking if he will see some belt dust around the bracket. If not, then he has to check if there is any leak.

If your using the Art pipes paired with the E370 (but there are two versions of it, not sure which one your running with but I guess it is the one they designed for forced induction according to your description to the pipe diameters), I don't think there isn't enough free flowing. I'm also running Art pipes but using a true-dual 3" catback exhaust. What's your average exhaust gas temperature under WOT?

I don't have an EGT probe, so I don't know. I have a very hard time believing this could be exhaust flow related, as I'm sure there's others with more restrictive exhausts that don't have similar problems. At worst case scenario if I can't figure this out, I'll just unbolt the damn thing and do a pull and see what happens.

Here's a picture of the pulley setup: https://i.imgur.com/wee3Icg.jpg

Looks like the stock 3.2 jackshaft sc pulley. Is that the brass shipping plug on the right side of the sc? It doesn't look like the 3/16" allen head dipstick cap.

The one on the right is the dipstick, the one on the left is the vent plug.

Good, just wanted to make sure.

Looking good. There seems to be no belt dust. Check if there is leak from the intake pipes, silicone hoses, gaskets, and/or valve. I'm always interested in the design and actual performance of the E370, especially its 2-1 Y section where there seems to be only one single 3-3.25" pipe as the merge collector. I think it does help advance the scavenging effect but dunno if this will cause back pressure to hinder CFM of big power. From their web info, it seems the exhaust is capable of supporting 700-hp output. Let us know the dyno results and type of fuel you use when you have them (if possible). Guess this is the only way to justify the hypothesis of the restriction (whether it does flow freely or not).

I was planning on doing the dyno next week, the local shop has an opening, however I did a small 4th gear pull and it feels like my poor stock clutch is already trying to slip. I need to take care of that first unfortunately, it would just be a waste of money if it slips while on the dyno. I did around 4 data logged full throttle pulls today, and checked around the belts and there is zero rubber/belt dust anywhere that I could see. The boost pressure is seemingly inconsistent, I really don't trust this MAP sensor so I'm ordering a boost gauge now. According to the MAP sensor I hit 0.80 bar (11.6psi) at anywhere from 6,300 to 6,600 rpm. The last pull I did peaked at 0.90 bar (13psi) at 6,800 before again, falling off to around 0.80 bar by redline.

Alright guys, car just had everything installed, NO TUNE has been uploaded yet.
MAFS and throttle bodies are connected correctly. My Tech found similar issues here online and thought a proper tune being uploaded or a recalibration of throttle bodies will correct, but tuner says it won’t. You guys have any ideas?

Thanks!

Are these OEM MAFs, TBs, wires, cables, and connectors? Had they cleaned before install and startup? Which extension cables are you using? I'd ask my mechanic to check these first, followed by checking the TPS. Make sure your using the OEM wires, connectors, and the Stillen Gen2 extension cables. As long as they are fully functional, I see no reason the TBs can't be calibrated through the learning process.

We’re using whatever came with the kit, nothing special, so not sure if it’s Stillen extensions or not. We have not started the car yet as it has no tune uploaded yet. I’ll pass along the info. Thanks.


Sent from my iPhone using Tapatalk