secondarries

[PhillipsLT5]

mine are eliminated, no problems, extra 10hp

[Pete]

Originally Posted by RHanselman

Pete,

I was able to get 450 rwtq from my stock block 350. Just a little top-end porting (excluding heads) with the secondaries remaining. Wasn't really that hard

Nice
Ron,i almost fell off my chair when i saw this.
How much boost?
If i had to guess i'd say around 5lbs.
Pete

[XfireZ51]

I thought the same thing. That can't be NA!

[Paul Workman]

Originally Posted by PhillipsLT5

mine are eliminated, no problems, extra 10hp

10hp....Ain't too shabby, depending on whatcha pay for the chip calibration.

[RHanselman]

Originally Posted by Pete

Nice
Ron,i almost fell off my chair when i saw this.
How much boost?
If i had to guess i'd say around 5lbs.
Pete

4-5 psi... Don't you love the area under that torque curve!

I'm going to do a single project when the stock car returns.

Raptor LT1/4 Single Turbo system on the LT5
Stock LT5 w/Jerry's Head Gaskets
The new ECM
Meth (for safety not power)
Fuel System upgrade (pump and inj)
6-8 psi
Goal is 525 - 550 squared...

[janozr1]

i get it .................Marc thanks , anybody see mr.Jeery ?


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[RHanselman]

Jerry is on vacation. I believe his last text was from a black sand beach in Tahiti...

Cheers,

[Hog]

Originally Posted by grahambehan

At the time of the project ending announcement Roy Midgely made a presentation to the LT5 team at Lotus which included a page and a half of A4 bullet points on the technology transfer from the LT5 programme to what would become the LS engine family, guess I need to dig that out.

Meanwhile, fuel to the secondary debate

Thanks for posting that dyno graph Graham I have never seen a Secondary open vs. Secondary Closed dynograph overlayed before.

As expected extra airflow adds power and torque, and also raises the rpm at which peak power and torque occurs.

Looks like having the plenum throttles open costs about 30 lb/ft of torque at 2500rpm, I assume that if we exrapolated that graph to lower rpm, we would see even more torque loss with the Plenum throttles closed..

Both PT open and PT Closed both make the same 290 horsepower at 3900rpm.

Thanks again Graham.

peace
Hog

[Hog]

Originally Posted by Pete

1: That can be fixed in the tune.

2: From the torque #'s this a 368ci ?

I've seen a lot of tuners programs none had any low rpm tuning.

I have looked for quite a while for this dyno readout that shows a pull with the Port throttles closed and another with the Port Throttles Open. Appears to be making more low rpm torque and less power with the Port Throttles closed, and less low rpm torque but more upper rpm power with the Port Throttles Open.
Thanks again for posting Graham.
I couldn't find it as I wasn't spelling secondaries the same as the title of this thread in the search box.

Graham, did you ever find that page with the bullets that illustrated what engineering from the LT5 program was used in the eventual GEN 3 LS1 engine program?