Pulley down the TVS, and it will whine just fine

 

Lol this is true. It comes with a 2.9 so I'll start with that.

 

yeah, i was surprised at how audible the tvs was compared to the m62(i remember it being noticeably quieter) but now not so much.


heres what i got so far(mind you the tvs numbers i had just started dialing in the maf, so no timing and fuel was off) still managed 9more peak hp with 12less degrees of timing and 11more peak tq on 16 degrees less timing Go Boost!!!

 

What virtural dyno are you using?

 

brad barnhills, saw it on HPT but didnt have info on it for sc's so i got him to add it

BradBarnhill.com

 

Your hitting 21 psi on the stock pulley? What exhaust setup are you on? My car on the stock head with my exhaust setup except on the old 2.5" dp on the 2.9 would not see anything over 19psi even at 7200rpms. Very well could be the exhaust setup difference. Now with the ported head and and 3" dp the 2.7 nets no higher than 20psi.

Also, I wasnt aware that he added the LSJ to the Virtual Dyno! Thats pretty cool

 

ottp LT(blown out cat), 3" res, stock axle back

...here's why i was getting that much boost(at least i hope that's why)

low-mid 30's with 30.31barometer

when i was running this exhaust setup in cali on maybe a 70-80* day stock pulley m62(same setup as the graph i posted minus the CAI) at 7-7200 i'd only hit 10-10.5psi

Cobalt Boost Gauge WOT - YouTube Cold Air Boost lulz - YouTube

 

Oh yeah I forgot you moved to NY, cold weather makes sense lol! And mixed with the stock axleback im sure that makes a little difference.

 

in cali with the noodle and the tvs i dont remember it getting much over 20 even

 

have you dynoed at all with your Long Tube?





my tq curve seems odd though compared to most ss/sc's...maybe i can hit the low end with more timing see if it helps. unless its my engine or logs

 

those of you with the bad bearing, anyone have a vid or describe the sound well?

 

 

thanks, i dont think mine sounnds that bad, but i dont think its right either


What do you think? - YouTube

 

pretty rattly, but looks and sounds good! rev her up i still dont know how these things sound due to lack of yt vids!!

 

anyone else that had this problem wanna chime in?

 

how many miles already on your tvs?

My tvs gets here on thursday!!

 

i have pretty much exact number, but i'd have to get my external HDD less that 10K though

 

It sounds like Jrhdpaintball's but not as loud. Yikes...

 

Cobalt SS with TVS blower - YouTube

bika's

 

thats how mine was some days really loud, i could hear it inside my car while at a stop, and other days id have to pop my hood to hear it..

either way mine had 3k miles on it when mine first started...

inside of tvs housing when i first pulled it apart





when i pulled the rotors out these came out with it

 

Ouch! And ZZP was able to rebuild that even with the housing like that?

 

damn...iono what to do now i was so happy i just got it back on and almost done tuning(needs timing)

so it messed up the aluminum blower housing where the bearings sit? or just where the rotors rubbed the housing?

is that the inlet end or the the snout that got messed up?

 

Mine was pretty similar. Sent it to Josh@OTTP and when I got it back it was nice and quiet at idle. I hope Harrop has fixed their QA problems with this blower by now.

 

rotors got scored on the outside tips where it would rub against the housing... the housing got scored... i sent the housing to zzp to replaced all needle bearings, cost roughly 180 parts and labor, got it back, very lightly polished the housing and the rotors just to take away the sharp burrs.. put it back together and made sure nothing was interfering with each other, sounds ok at the time... put it back on the car, ive had it on for atleast 15k miles, and while its not super quite, its 100 times quieter than before it all happened..

i figured i had little to nothing to loose since it already happened and all i would be out was 180$$...

dyno tested when i first got the blower and ran 298hp, tested after all this, even with the scored up housing, still pulled 295 hp, with the same run, so i dont see this blower being a problem right now

both pulls were 20ish psi, no loss in psi

dont be afraid of this happening, just be aware if you have a doubt about it, i would recommend to take it off just to be safe, and if you can afford send it out to get the bearings replaced...

 

thats the end closest to the snout where the needle bearings had play and was rubbing on the housing...