“Big” centrifigual superchargers on low boost?

[TheInfamouSS]

Originally Posted by stevieturbo

With my YSi, nowhere was it a turd.

And never think for one second that just because you dont see boost on a gauge at lower rpm's, that the blower is not assisting power. Because it definitely is.

Try running the same engine with and without the blower and it will be very clearly evident.

As for nailing the throttle at very low rpm's, the blower or anything else doesnt make that a turd...that's just bad driving if you intend to race. But even mine pulled very strongly from very low rpm if for some reason you wanted to drive like that.
It'd never be like a PD blower though, but the two are just intended for different driving styles really.

That was the whole thing I was agreeing with, stuff happens wasn't paying attention, wrong gear went to go and hit it and yup turd. All driver error and even the person I replied to said the same thing. Everybody has had their whoops driving moments, I for one can admit im not perfect.

I love my centri. So much that I am currently upgrading to a YSI as well as some other "goodies" while we are at it.

[BiggFoot]

Originally Posted by TheInfamouSS

That was the whole thing I was agreeing with, stuff happens wasn't paying attention, wrong gear went to go and hit it and yup turd. All driver error and even the person I replied to said the same thing. Everybody has had their whoops driving moments, I for one can admit im not perfect.

I love my centri. So much that I am currently upgrading to a YSI as well as some other "goodies" while we are at it.

Yes sir, what I probably should have added was something along the lines of low RPM's coupled with the wrong gear can cause the centri to act like a turd. I can be at very low RPM's in first gear and when stomped it will pin ur azz to the seat, but if I am going say 40 mph in 4th gear and try to stomp it, lol, nothing but bog and the supercharger cant overcome driver ignorance

BTW, love my centri too. If I could 60' this car would already be in the 9's even with the restriction plate in, but going to the track once every year or so is not gonna cut it for experience.

[eLeSthree]

Reverse will make it laggy also, gotta watch out for that. lol

No I was worried about it being lazy until the higher boost pressure came in, but now that the car is tuned, I can clearly see that is not the case. CFM @ psi has changed, big time.

Now I need a forged shortblock so I can turn it up!

[looks over shoulder to make sure wife isnt around]

[BiggFoot]

Originally Posted by eLeSthree

Now I need a forged shortblock so I can turn it up!

[looks over shoulder to make sure wife isnt around]

Yes I need one of those too (also looks over shoulder)

[TheInfamouSS]

Originally Posted by eLeSthree

Reverse will make it laggy also, gotta watch out for that. lol

No I was worried about it being lazy until the higher boost pressure came in, but now that the car is tuned, I can clearly see that is not the case. CFM @ psi has changed, big time.

Now I need a forged shortblock so I can turn it up!

[looks over shoulder to make sure wife isnt around]

Only good thing out of my last relationship not working.... I can build a short block this year. Nothing special. Just some forged rods and pistons to put me around 9:1, but will be plenty of fun with the YSI.

Glad to see you are liking the new setup. The ESS kit is definitely a well put together kit. I have an ECS kit on mine and I have no complaints, but I don't think you can go wrong with either.

[TheInfamouSS]

Originally Posted by BiggFoot

Yes sir, what I probably should have added was something along the lines of low RPM's coupled with the wrong gear can cause the centri to act like a turd. I can be at very low RPM's in first gear and when stomped it will pin ur azz to the seat, but if I am going say 40 mph in 4th gear and try to stomp it, lol, nothing but bog and the supercharger cant overcome driver ignorance

BTW, love my centri too. If I could 60' this car would already be in the 9's even with the restriction plate in, but going to the track once every year or so is not gonna cut it for experience.

Lol. See I knew exactly what you were talking about. I did the same exact thing word for word. 40 roll, wasn't paying attention to gear, stomped on it.. turd.. all driver error.

I have been following your build for a while. It's a really nice setup you have there. You need to get it out to the track more!

I can't wait to have a car that can actually go A-B (there were a lot of little problems from previous work) so I can really see what this thing can do. Haven't had one solid pass yet. Chasing belt shredding issues (main belt), hack job on my zl1 HD kit causing a whole lot of clunking (and not that normal GM slop), a whole bunch of things but we are getting them all lined out.

Now let's see those 9 second passes. I know you got em in ya!

[GHOSST2012]

I did exactly what the OP is talking about I went straight for the f1a on my stock ls3 knowing I'd do motor work eventually. The f1a was running 9lbs (lowest it can possibly do) on the biggest pulley. Car made 620 on pump and 670 on e85. Definetly didnt feel like a slouch!

[racesloth]

I am looking for 10ibs out of my YSI-B but I think that the cam spec will also help it out.... With the ported heads, cam and LT's the 3.6 pulley may not make 10lbs - we'll see.

I bought the YSi-B thinking I was going to go forged and aftermarket block. But now I think I will sell the Camaro. In my old age I have come to realize my true love is a Buick GN with a swapped LS 6.0 liter/TH400 and turbo. I have a spare Turbonetics Y2K 88mm turbo and an extra set of LS-3 heads to get me started.... Or maybe put the Y2K on my 5.0 Mustang and take the BW S500SX 88mm for the GN.

[race24x]

I am no expert, but my own supercharger started with a smaller pulley and the issue I had was in didnt make much boost until higher in the RPM range. So around 4500 before it started to make decent power. by putting a smaller pulley on I made more power and it moved the power down 750 RPMs. May be different with a huge blower like you are talking, just my .02

[eLeSthree]

To answer my own question: It's all relative.

No, the big blower on low boost isn't lazy. The car felt fast. However once you drop a couple pulley sizes and get the blower into its efficiency range, you realize it was lazy, and now you think its fast. Then you get into a twin turbo 1200hp car, and realize your big blower car with its small pulley is actually lazy/slow.

It's all relative, but you can definitely run a big blower on low boost until you get money to turn it up.

[mrimpala02]

Originally Posted by eLeSthree

To answer my own question: It's all relative.

No, the big blower on low boost isn't lazy. The car felt fast. However once you drop a couple pulley sizes and get the blower into its efficiency range, you realize it was lazy, and now you think its fast. Then you get into a twin turbo 1200hp car, and realize your big blower car with its small pulley is actually lazy/slow.

It's all relative, but you can definitely run a big blower on low boost until you get money to turn it up.

Well said my friend!

[stevieturbo]

Originally Posted by race24x

I am no expert, but my own supercharger started with a smaller pulley and the issue I had was in didnt make much boost until higher in the RPM range. So around 4500 before it started to make decent power. by putting a smaller pulley on I made more power and it moved the power down 750 RPMs. May be different with a huge blower like you are talking, just my .02

Someone on another forum posted a graph of a few cars...cant recall which forum. Might have been this one....wherever though.

A Roots car, Centri and TT....now obviously there are a huge array of variables there too, but what it highlighted is what I've said for a long time about centris and people seem to ignore.

And the graph of torque etc proved it....even though you may not be seeing positive pressure on a boost gauge at lower rpms, or even very very low boost....dont for one second think it isnt moving lots of air and assisting power. Because they definitely are.

The TT car, and presumably they were fairly small turbos as all graphs where around the 650-750 range, but the lower rpm torque from the turbo car was noticeably lower than the centri, which actually wasnt that far behind the Roots.

And top end, of course both turbo and centri were the winners. Centri's really do offer good gains everywhere, as well as instant throttle response which can make the car feel far more exciting.

Both are great though.

[dreksnot]

https://www.camaro5.com/forums/showt...=549379&page=2 post #22

The TT had babies 56/61mm turbos.

Yes, centris are powerhounds when set up properly (as any other FI properly set up).

[stevieturbo]

Originally Posted by dreksnot

https://www.camaro5.com/forums/showt...=549379&page=2 post #22

The TT had babies 56/61mm turbos.

Yes, centris are powerhounds when set up properly (as any other FI properly set up).

Maybe the dyno didnt load the turbos up well, but small turbos should have performed better down low. But it does highlight how good centris are. They really do excel everywhere.

And I can speak from direct experience having run the exact same engine in my own car as both n/a, centri and TT at various times.

My YSI was great, although I ultimately moved on to turbos mainly for a wider range of options, quieter operation and I wanted more power. And Vortech are ridiculously slow at responding to customer requests for better units.