LS1 Daytona finally on the Dyno - FFCars.com : Factory Five Racing Discussion Forum

mmarshall · 07-18-2012, 09:27 PM

I finally worked out all the major problems with the engine install and was comfortable getting a final dyno tune. Today I took the car out to Omer's (STL Tuners) and did about 8 dyno runs.

We only found about 10 HP at the peak but picked up 70 ft lbs at 2500 rpm. It was running very rich with the stock tune. The amazing thing is the engine made 350 HP at the wheel! That is what the engine was rated at the crank in 2003 and was a full 50 HP more than I expected. That means the engine is making around 400 HP at the crank. I really am shocked at the numbers it put down.

Here is a pic of the before and after tune:

RobbieD · 07-18-2012, 10:39 PM

Pretty cool!

If/when I do another project like this, an LSx will probably be what I use. Bang for Buck, hard to beat...

MPTech · 07-18-2012, 11:35 PM

Glad you got all of the bugs worked out. Can't wait to see it in action again. When's the next meet? (and where?)

mmarshall · 07-18-2012, 11:43 PM

Next event is this Sunday at Gateway. I run heat 1 so I will be running between 9 and 11.

Here is video of one of the runs:

Ls1 Daytona dyno - YouTube

Cone Basher · 07-19-2012, 11:54 PM

Sounds real strong. This combo should be real quick from corner to corner. Just an idea on brakes from your last reply about why you thought you were slow. You might take a look at Hawk HP+ pads or another agressive pad. I have them on my Coupe and I'm pleased with the performance. Lookng forward to the next video.
Just an Idea:
Neat car:
CB

mmarshall · 07-20-2012, 01:18 AM

CB great minds think alike. I just installed the HP+ pads last night. Initial braking feels better. I will know more on Sunday.

CHOTIS BILL · 07-20-2012, 02:12 PM

The best pad I ever used was Wilwood polymatrix type A. Great initial bite even when cold and very high friction but easy to modulate.

Bill Lomenick

JohnPR · 07-20-2012, 03:38 PM

That is great! I was also wondering about how a LS engine would work out in a coupe. Congrats!

John Dol · 07-20-2012, 04:07 PM

Nice work Mike!
I'm sure you'll post video of your run this weekend. looking forward to it.

John

turbodon · 07-20-2012, 09:01 PM

Why was the Dyno done in STD Smoothing in stead of SAE?

STD will show 8 to 10 HP more than SAE.

mmarshall · 07-21-2012, 04:35 AM

Quote:

Originally Posted by turbodon

Why was the Dyno done in STD Smoothing in stead of SAE?

STD will show 8 to 10 HP more than SAE.

I am not sure why. My guess is that using 15 degrees C and 29.92 is a more standard day than a 25 degree day. All of aviation uses 15C as a standard day.

I have witnessed a Roadster with a 588 ci big block make 500 RWHP on the very same dyno, so me making 350 is not so bad. Even if he used SAE and it made 340 HP I would have been happy.

I do realize though that if my engine made 340 HP on a 80F degree day (SAE) that it would make 360 HP on a 40F degree day. We did the dyno on a 100+ degree day and went for a ride afterward. The car spun the tires pretty hard in 1st and 2nd and seemed very fast. With all this in mind it makes me look forward to those 40 degree days with an extra 30 HP!

Cone Basher · 07-22-2012, 12:17 AM

mmarshall: I know it will cost you a few more $$ but you really need to try a set of Hoosier A6 tires on your car. I ran Kuhmos on mine when I first built my Coupe and the turn in was much improved with the Hoosiers. I was running over cones with the inside rear tire, they bite big time on the first run and do not need two or three runs to bring then up to temp. You might have to spray them after the third or fourth run depending on tire temps. I check tire pressures after each run but I recommend them. If I lived closer I would let you try mine. Made a big difference in my car. Looking forward to your next post.
Good luck:
CB

turbodon · 07-22-2012, 01:03 AM

just asking. The industry accepted standard is sae.

The Car companies use sae when they give hp ratings.

If using some other smooting can possibly give inflated #'s.

Atmosphere temp is always measured and incorporated into the software at the time of the run.

mmarshall · 07-22-2012, 06:09 AM

Quote:

Originally Posted by turbodon

just asking. The industry accepted standard is sae.

The Car companies use sae when they give hp ratings.

If using some other smooting can possibly give inflated #'s.

Atmosphere temp is always measured and incorporated into the software at the time of the run.

Don I am not sure I would use the term inflated. If anything is inflated it would be how they all rate their engines at the crank instead of at the wheel. I remember Mazda getting sued because none of their cars would make even close to the rated power.

One just has to realize that the dyno numbers I was given are what the car would make at 15C degrees and that at 25Cdegrees it will make about 10 less HP. I don't consider it deceptive as it is impossible to say a engine always makes exactly 350 HP. It is just common sense that engines make more power in denser air. Then again common sense is not so common.

CB I currently run Hankook C71 R-comps 275/17 front and back. I really need more rubber in the rear to help with oversteer but that will have to wait for next season.