Genesis Update - Chassis Dyno Numbers

[JRoss]

Hey All,

For those who have been interested in my Genesis build here is round two info. So far I have put about 400 miles on the new motor. Today while at Keith Craft Motorsports in Plano I was talked into some dyno tuning, everybody there wanted to see what kind of numbers I could put to the tires. A little tweak here a little tweak there and WOW even I was impressed. I have to admit these numbers exceeded my expectations expecially the torque curve.

511 - HP
502 - TQ
At the rear tires.

I will try and attach a picture of the dyno sheet here.


Just as a reference point (not to start another dyno argument) my last motor was also run on this same chassis dyno. The other engine builder built my 428 CJ and provided me a dyno sheet where the motor made 458 HP When running on Keith Craft Motorsports chassis dyno it put 345hp to the rear tires. Same dyno same car same everything but motor.

John

[decooney]

Does anyone on this forum have first hand updates on Genesis Iron FE 427 blocks?

Are they for sale now to the general public? When?

How much do they cost?

Any possibilities for multiple quantity discounts, and for dealers?

What machining is required?

Any updates on reliability and quality of workmanship?


Thanks, any reports would be helpful.

[CSX 4027]

I am confused by your numbers. At 649 HP, you should me making about 584 to the rear wheels. What's up with the difference? One of the dyno's seems to be off and it sounds like the initial one.

[750hp]

Steve - not looking at the power levels so much as the percentage loss through the drivetrain. His first engine got 75% of the engine HP to the tires, second engine got 78% to the tires. That doesn't seem as though the dyno numbers are out of whack, rather - they're fairly constant.

Your 649 / 584 idea suggest a 10% total power loss from engine to chassis dyno. I haven't seen any street cars that can get that percentage of power to the tires.

[slithering]

Duane,

The new Genesis 427 S/O cast blocks are available now through Keith Craft Racing (in the advertisers). You might give him a call. I have one in transit to me now, should be here on Friday. I'll post when it arrives. Keith and his crew are excellent to work with.

Chris

[MidOHasp]

I didn't think 22-25% loss was very standard, in any event. Nor is 10%. I thought 15-18% was a pretty reasonable assumption.

Am I making those numbers up? I make a lot up, I could be making those up.

[blykins]

I lost 32 (13%) hp to the rear wheels on my Mustang GT....Flywheel hp is supposed to be 260....it put 228 to the ground.

That's another reason I wanna splice some decent mufflers into my sidepipes instead of standard issue glasspacks....Hopefully I'll gain some rearwheel horsepower....

[427Aggie]

Everything adds to a loss of horsepower....the type of rear end...the tunning....the drivetrain...everything adds up...

I have seen anything from 15%-30+% depending on how restrictive everything is.

Nothings off Steve...

Matt

[JRoss]

Hey Steve,

the guys at Lone Star tell me that 22% is a very typical loss for their cars. Part of the problem is that lone star does not have a balanced set of headers so I am sure I am losing some power there. Add to that all the other street parts that could be robbing power and 22% is not bad. Also Rob at Keith Kraft said he could get me another 15 - 20 hp at the tires but I would be giving up some of the low end drivability on the street. Since the car spends most of its time on the street I opted for drivability over power and right now I am very pleased with both drivablity and power. Not bad for a pump gas street motor huh.

Duane,

shoot me an email with your contact information if you like. I would be happy to discuss anything about my genesis block. So far I have been very impressed. The genesis block is best described as overkill. It is about 30 lbs heaver, thicker walls, bigger crossbolts, stronger bottom end and improved oiling. I know of two running here (mine and one in a fairlane 725hp) and he is very happy as well. I believe there are also a couple sitting on garage floors awaiting installs that should be on the road this summer.

Chris,

keep me posted on your build!!

John

[CSX 4027]

I once read that 67.8% of all statistics are made up completely!

[427Aggie]

Steve,

I think we can solve this...give a guy named Sal a call up in NJ...he bought and ERA and put a KC motor in it...ask him to give you a ride.

Matt

[VitaminC]

There are a couple of factors at work when it comes to Dynojet numbers.

Transmission and differential are major factors. Front wheel drive (typically import) manual transaxles are at the high end of the efficiency scale, often around 10-15%. Bone stock vehicles rated at 170 hp for example will Dynojet in the 150 rwhp range. On the other end of the scale are rear wheel drive automatics and lossy differentials. A great example of this is to convert from a stick to an automatic with no other changes. I've seen it done. The customer was sick over it! But the car performed great when all was said and done.

This gets into the other issue. Rear wheel numbers are neither a percentage nor a set amount. Officially they are "sort of both." You can hear a much more flowery version of this explanation if you call a chassis dyno company.