“Big” centrifigual superchargers on low boost?

[dreksnot]

Ok, doggone it! Making it more apple-to-apples, I had a higher boost run with the twins (performed a year later), so I deleted the 10psi boost plot and overlayed the twin 15psi boost (got braver and braver each year dialing up boost). Same dyno, different year.

Now, this plot really shows the potential of turbos, more power output per pound of boost (no parasitic loses).

This remains to be my thinking - the area under the curve (powerband) is gonna win races - the more area, the more power applied during a race. And, real life demonstrated it with our little competition at the strip (until the Maggie got a 100shot). That said, you still need a good launch to make a good run.


Plot Legend:

Garth has a roots [forged LS3, heads, 16psi]
Hubbard has a centri [SBE LS3, D1, 15psi]
Ray has twins [SBE LS3, head work, 15psi]
Allen has nitrous [SBE LS3, 200 shot]

The lower start of the plots is the Horsepower, and the higher start of the plots is Torque. Obviously, they cross at 5,252rpms.

[stevieturbo]

The headwork will obviously help a lot, so the D1 is at a disadvantage to start with. And whilst it is a very good blower...in line with this thread, I wouldnt call it a "big" blower.

I'd expect a bigger blower to see gains everywhere by comparison for same boost.

Big centris do work great...as do turbos.

I just cant see any real reason most would fit a small blower, unless they really did never intend to grow.

[dreksnot]

I think most folks could optimize the FI setups to obtain more power - making the setup efficient. It's so many people who just throw FI on and expect the world.

(headwork was only BTR springs, rockers and LS9 gasket - no porting)

You wanted apples-to-apples : that's about as close as I can manage, with about the same boost levels and LS3 setups. Like I said from the beginning, look over the graph to see how power is delivered by the different types of FI/power adders. I think an optimal setup would be turbos/centri with nitrous. But, that's another motor....

[stevieturbo]

A pair of big turbos and a Roots would be great. Instant power/torque at all rpm's and let the turbos takeover at the top end.

Just not sure how much impact the Roots would have at impeding airflow at the top or whether you could safely get away without a charge cooler for the blower side given it wont really be doing a lot of work..

but it'd be easy to implement on most cars.

[dreksnot]

Don't know of anyone doing that compound boosting. I'd think it would be an IAT nightmare for heat. Got the heat of compression for the turbos then the heat of compression from the rotors (and all the metal parts of the blower). An ice tank would be a must, and meth would just reek havoc on the rotors. Still, I'd think it would be a fun monster to drive!!! Think I'd still prefer turbos with nitrous (wouldn't need meth).

[mrimpala02]

There was one guy on this forum that attempted compound boosting with a heartbeat and AGP setup. The heartbeat ended up being a restriction for the turbos so he ended up dropping the supercharger. It did make ~1100 rwhp IIRC.

[blake-b]

Originally Posted by mrimpala02

There was one guy on this forum that attempted compound boosting with a heartbeat and AGP setup. The heartbeat ended up being a restriction for the turbos so he ended up dropping the supercharger. It did make ~1100 rwhp IIRC.

It was JessRayo
He made over 1400whp
https://www.camaro5.com/forums/showthread.php?t=355731

Not a 5th Gen but there was a compound boosted ZR1 that made just under 1500whp with a single 88mm rear mounted turbo going to the LS9 blower. I have no clue why it worked with the LS9 blower and not so much with the heartbeat Jess had.

http://www.superchevy.com/features/1...wer-at-36-psi/

And I think Brian Tooley owns the ZR1 now.

Here's a little story about the difference between a TT and a PD. The camaro I had made just over 1000whp on low boost (13.6 lbs). After I sold it, I bought a ZR1 with 850ish whp. When I would spiritedly drive the camaro with my wife in the car, she never said anything. When I did it in the ZR1 (only once with her in it) she said "If you do that again, I will throw up in your car." As has been stated ad nauseum, it is where you want the power to be delivered.

Also, I had a Ysi before the TT and made just over 1kwhp with it, too.

[joshnmn]

HAHAAHA. Well, there you go.

[stevieturbo]

The Roots blowers should have a bypass, so there shouldnt be too much reason for them to be a huge restriction, as in theory you should be able to have two airflow paths if designed right. ie through the blower rotors...and also around them via a bypass.

I've seen a centri/roots setup before down under. Probably not the best use of either unit, but cool all the same.

[Moreair1]

Originally Posted by blake-b

It was JessRayo
He made over 1400whp
https://www.camaro5.com/forums/showthread.php?t=355731

Not a 5th Gen but there was a compound boosted ZR1 that made just under 1500whp with a single 88mm rear mounted turbo going to the LS9 blower. I have no clue why it worked with the LS9 blower and not so much with the heartbeat Jess had.

http://www.superchevy.com/features/1...wer-at-36-psi/

And I think Brian Tooley owns the ZR1 now.

Here's a little story about the difference between a TT and a PD. The camaro I had made just over 1000whp on low boost (13.6 lbs). After I sold it, I bought a ZR1 with 850ish whp. When I would spiritedly drive the camaro with my wife in the car, she never said anything. When I did it in the ZR1 (only once with her in it) she said "If you do that again, I will throw up in your car." As has been stated ad nauseum, it is where you want the power to be delivered.

Also, I had a Ysi before the TT and made just over 1kwhp with it, too.

Weight has a big thing to do with this as well In this case how the cars platform handles, my grand prix gxp felt alot faster than my camaro when it was stock which it wasnt. it was due to weight and how the suspension worked on the gxp, so I dont think it's really a valid comparison (the camaro with the ysi and turbos would be), but on that note I would still love to have your zr1 it's one sick car, and yes I would of chosen that car over your high hp camaro

[Moreair1]

Blake im curious, how much boost is your zr1 making?

[blake-b]

Originally Posted by Moreair1

Weight has a big thing to do with this as well In this case how the cars platform handles, my grand prix gxp felt alot faster than my camaro when it was stock which it wasnt. it was due to weight and how the suspension worked on the gxp, so I dont think it's really a valid comparison (the camaro with the ysi and turbos would be), but on that note I would still love to have your zr1 it's one sick car, and yes I would of chosen that car over your high hp camaro

Totally agree. Several hundred pounds makes quite a bit of difference in the giddy up.

Originally Posted by Moreair1

Blake im curious, how much boost is your zr1 making?

It will touch 18 and fall just a little into the 17s. I just ordered the Kong HD tensioner which should eliminate any belt slip. I can see belt dust so I know it is happening.

I have a 2.35 pulley with a 14% crank pulley. There are also 2.2 and 2.175 pulleys. I am not sure if the juice would be worth the squeeze (HP gain vs shortened blower bearing life) to put one of them on. I did ask Greg "Kong" Keosayian about it and he said to stick with the 2.35.

[Moreair1]

18 psi is good, I know you will get that all straighten out, just wish there was a track close to you to see what that beast would do

[blake-b]

Originally Posted by Moreair1

18 psi is good, I know you will get that all straighten out, just wish there was a track close to you to see what that beast would do

Tuning is in a couple weeks and the weekend of Apr 27-28 is SCT in Topeka (1 hour away) and I am going to try to go there.

A very very similar car (with a better driver!) went 9.05 at 156
https://www.instagram.com/p/BtudKuPn..._web_copy_link