And dont forget, this was my opinoin when I say " I dont feel the kick in the butt that much". If you rode in my car you may say very different, everyone concept on whats fast is different. So I may have chosen the wrong words, maybe find a car that has this flash in your area and go for a ride in it?

 

UPDATE: I let the wife do some driving since I had a few drinks and I told her to drive it hard so I can feel the kick in the pants. I must say when she nailed it everytime it held me in my seat good and hard. You can feel the car is very heavy like a tank but has lots of power to push it. So my outlook on it now is it does give a kick in the pants feel

 

I think I have a decent understanding Bruce, but would love to hear a more educated explaination if you don't mind breaking it down for a newbie.

Thanks!

 

Engine torque is multiplied by the transmission gearing and rear end ratios, and the important thing is how much torque the car makes at the wheels. Since lower gears multiply engine torque more than higher gears, we can generally get more power to the wheels by holding each gear to redline, or close to it (unless engine torque falls off significantly near redline, which the 5L S/C does not). Shifting up to the next higher gear means the engine's torque isn't being multiplied as much. So the torque we're interested in for maximizing acceleration is the torque made at high rpms.

Horsepower and torque are related mathematically with hp = tq x rpm / 5252. You'll find that a slight increase in torque across the powerband will yield an ever greater increase in hp as rpm increases beyond 5252 because of that relationship, where a 30 lb-ft increase in torque is exactly a 30 hp increase at 5252 rpm, but becomes a 37 hp increase at 6600 rpm. Since the engine will be operating at only high revs during maximum acceleration, knowing the increase in horsepower is the most meaningful measure.

Some engines have a very pronounced torque peak in the mid rpm powerband, and falls off at higher rpm. As the car accelerates at full throttle in any given gear you get pushed back into your seat more forcefully at its torque peak and you "feel" the strong torque. But as you rev beyond that the engine makes less and less torque, less and less tq at the wheels, and acceleration falls off until you up shift. Revs drop back into your higher tq range, but you've given up the advantage of the lower gear ratio, and acceleration again suffers for it.

So that's a real quick and dirty on why torque at high rpm makes the car accelerate faster, and why the increase in peak horsepower is more indicitive of acceleration than the increase in peak torque. In the case of the 5L S/C, you'll notice the torque peak is below 3000 rpm, and while that makes the car "feel" powerful for daily driving, its the engine's ability to retain a high portion of that to redline that makes it accelerate as well as it does, and the fact that the engine's factory rated hp (ie 510 bhp) is higher than torque (461) is a good indication of that desirable powerband.

While wheel horsepower always measures lower than factory brake horsepower, BigCat09's very serious increase in whp to 475 will have a pronounced impact on acceleration, even if the more modest increase in torque doesn't make as pronounced an impact on the "feel".

There are several good articles on-line for those wanting more in-depth information by doing a Google search under "horsepower vs torque".

Bruce

 

You have two horses. One-horsepower is a Mustang
and one is a Clydesdale .
A horse is a horse. The Clydesdale has torque.

 

Hello there -


I'm very interested in the ECU tune + SC Pulley for my 2009 Jag SV8. I've noticed that you post results of 470 to 590hp w/ TUNE/Pulley.

Can the same be offered for my 4.2L SC? I'd very much like 120HP extra haha

 

@mdm https://www.jaguarforums.com/forum/j...upgrade-68305/

 

Hey Guys!

An ETG representative will be around Boston and Connecticut until Sunday. If any of you are interested in having your vehicles programmed, please contact me immediately.

Sorry for the short notice!

Kind regards,

ECU Tuning Group

 

Why don't you guys come to New Jersey?

 

ETG, I agree come to NJ and take a spin in your worlds fastest cat first hand.

 

I think you need to explain more on this flash you have. That link has some incorrect data listed in it. We or shall I say I will need more info to back it up. Got any dyno sheets of a US spec car from before and after? That would be a start. Waht is the US$ conversion cost of the flash? And it says up to 560hp only?

 

So what are the stats? I emailed rica and didn't get a reply. What's the hp increase in a us spec car? 1/4 mile improvement? 0-60mph improvement? Is the top speed limiter removed? If so, what's the top speed? What the price in US dollars? And how do we insult all the tune in the NY/NJ area??

 

Is it just me, or is there something missing when there are no empirical track times for any tuned cars? To just say that a tuned car will have 560 hp, but have no proof as to how that power translates in real performance, makes it sound like any gains could potentially be academic or fictitious.

 

I can't even get an answer of whether or not it removes the top speed limiter and how to get the tune in the NY/NJ area.

 

You can find a list of dealers on our website. The closest one to you seems to be 212 Motoring. Give them a call.

 

BigCat09 has posted video's, time slips, etc about the tune. Since we have introduced this tune, not one complaint has been made. It seems like the only people who "talk", are the ones who have not purchased the product.

 

BigCat did it done deal. He the flashed his ECM himself with the ETG supplied laptop. Installed the pulley by hacking if off, but still did it himself. Now he informed us that they will loan a pulley puller for that job. SO simple. He dropped in a couple of K&N filters and bolted on a staniless steel exhaust. Going from 470 SC or 510 R to 580 HP is a good result. I am confident his result is the best and the simpliest. If I was not sending my son to college I would jump in no problem and follow his plan. Nice job Big Cat. You sold me.

 

There is no difference between a 470 hp 5.0 and the 510 hp 5.0 supercharged engines, not is there between the new 340 hp and 380 hp V6. It's only the software. Jaguar gets to charge (what? $10k) for the higher tune. I have a friend who seen the engines being dyno tested at the factory (he is in charge of the mid west) and he said they all (for a split second) show well over 600 hp, before the tune slams the power down. It's also ZF's fault as well. They are the ones posting the torque limit they do not want exceeded. Jaguar is hugely into long term quality. After what happened back in 2003 with the ZF 6, they are very, very careful. These engines are really held back. I spoke to the engine builder of the land speed record XFR, while standing next to it. It was just the normal pulley, air tube and CAT back, and of course took off the limiters in the software. It was Rocket Sport Racing that did it. Very cool guys and a wild looking Jag. The NO2 (which was only there for rad. cooling if needed) wasn't used. After they spun the tires at 200 mph, they put on the huge wing and added lead to the trunk. They replaced the plastic spare tire holder with sheet metal and filled it up with lead for more traction.

It's a crime that more companies (or some genius) hasn't come up with a inexpensive way to tune these cars software. It just sucks!

 

Why haven't some of you contacted Rocket Sport Racing to have them sell you the tune they use since they done it already and just flash everyones cars and make some $ off it?
The only part I see they did different then the rest of us is they made some kind of intake for the XFR which I have not been able to see. Anyone find a picture of the hood open so we can take a peek?
And the XFR they used looks like a 09 XF fitted with the 2010 motor and trans and not a 2010 XFR. Look at the body parts as the ylook like the 09 styling?

 

Your right, it is a 2009 SC fitted with the 5.0 engine. Good idea, I may give them a call.