Reckless

iTrader: (9)

Sounds like that will be a very fast car. I like the styling of those cars, and 500hp? More than enough.

hellbents10

iTrader: (10)

What fuel. Seems like a lot of timing.

John B

iTrader: (10)

I spoke with one of the most respected head porters here in the Pacific Northwest and he said that a round header tube on a "D" port exhaust is actually a benefit rather than a detriment! In a nutshell his explanation, which was based in theory and on proven dyno results, was that when the exhaust valve opens and the exhaust gas is exiting it is being pushed by a pressure wave created by the combustion process. As this wave passes over the "D" port in the head and transitions into the header tube, which is up against the head (below the "D" portion) that this wall acts as a barrier to help prevent exhaust gas reversion at lower engine speeds thus ensuring better exhaust gas scavaging and better cylinder filling without a diluted intake charge. Bottom line, the lost 4HP was due to header design (tube length, size, collector, etc) not the lack of a "D" port header design! Mystery solved!

Paynful

Are those number J-609 or J-1349 corrected?

427

iTrader: (3)

This engine was run in standard corrected. 60f-29.92

Kurt

Cyborg

iTrader: (8)

Awesome numbers! Now that you have proven BS3 to work w/ the LS7 I can see a lot of possibilities here! Question, did you have a chance to do a baseline with a stock LS7 computer and if so could you post those numbers for reference?

427

iTrader: (3)

The engine only ran with the BS3, should be no real difference between the two other than the speed density/mass meter difference. They both use seq control.


Kurt

Paynful

The factory rated 505 is SAE J-1349 (29.23" Hg and 77F) corrected, which most people refer to as SAE corrected. Kurt's numbers are SAE J-609 (29.92" Hg and 60F) which is referred to as STP corrected. The difference is about 3.8%, STP being higher. This makes the peak HP 527hp J-1349 or SAE corrected.

So...22hp gain with headers, dyno exhaust, and calibrations sounds about right.

chuntington101

Builder, not long before you will gunning for Gman and the 0-100-0 record!

and he only has a little 377!

Chris.

Builder

According to American Speed, his little 377 is putting out 680 bhp (with a big, unexplained correction factor on the dyno ).

Unfortunately, I can't make a record attempt. The 9.8 second record for 0-100-0 is for a car as available from the factory. I could only go for it if Ultima would start offering the LS7 and G50/52 combination for the GTR.

That's not to say I won't be working on beating it anyway.

gmangtr

Steady on now boys !!

I have to say that if I was to do a Canam ( which I am think about ) I would use an LS7, a motec m800 , fly by wire throttle, traction control.

I think this project is as important to the Ultima brand as my 377ci was ....

chuntington101

hehe, sorry gman, didn't think you'd read it!

so do you think Ultima might look at doing a LSx GTR/canam?????

would be nice as alot of the other kit car builders are starting to use them.

Chris.

gmangtr

I know the factory are very interested in the LS7 engine, we spoke last year about doing a Canam ls7, they were up for it !!

It really has to be the new engine of choice .. issues would be the the exhaust manifold and catalyst convertors that a new engine would require in the UK and Euroland. But considering it has the head designed by Chapman who did my head, Ti rods and valves it has the right parts for $14K (£8K) is unbelieveable

You would in my opinion have to run the reverie carbon side pods with a cold air feed to the throttle body

jsworkstd

Ultima recieved one of my ready to run Supercharged LS2's in England last week.
And yea, I'm Scott's friend doing a twin turbo LS2 with a pair of Turbonetics T61's
Jeff S
www.schwartzperformance.com

Builder

Hey Todd,

Didn't catch your post earlier. Thanks!

Do you think it will be competitive in the quarter? I hope to run mid-10s at ~140.

HPA BILL

nice numbers

427

iTrader: (3)

We are done tuning the LS7 with Big Stuff 3 controls.
In final runs, we fell just short of 560hp with the FAST TB upside down on a spacer. After installing the UMI tb upside down with the spacer, we made 564hp@6000 rpm. The UMI seems to drive up smoother on the transition from idle.
Thanks Scott(Builder) for sending your LS7 to be used in the test, I will be the one crying when it ships out......


Kurt

Builder

Kurt and John (from BS3)...you guys rule! Mark, your UMI TB rocks!

I can understand your tears, Kurt. Take comfort in knowing that it will be tears of joy at my end. You guys have accelerated my build in more ways than one and I am truly grateful.

564!!! Ohhhh, yeah baby!!!

MSURacing

iTrader: (1)

So Kurt,
Do you think that the UMI throttle body is worth the price???
How did it compare to the FAST unit by quality standards?? Is the throttle as cheesy as the FAST or not. I think we are all waiting to see what you have to say about this new throttle body.

427

iTrader: (3)

The off idle response was much smoother than the FAST. It has bearings on the shaft and comes with the hardware to attach the IAC and TPS. Overall this would be the one for a driver for sure and overall HP it was good for about 4hp over the FAST.


Kurt