Hey guys, I was recently looking at getting a Eurocharged Handheld tuner/pulley combo for my 16' R and was wondering what kind of trap speeds I'd be looking at in the 1/4 mile.

I went last weekend and ran a best of 11.44 @ 124.1mph with my stock R and was interested in getting a few small power adders to take it to lower 11's.

Is Eurocharged tune good with their 10mm pulley?

Or is Eurotoys better? 18mm pulley = more boost.. but I'm still apprehensive since Eurotoys isn't that well-known and prices their pullies for $600 more (a bit absurd for $799 for one pulley even though it's a lower S/C pulley). Is it much faster have a lower AND upper pulley swapped out plus a tune?

I don't know if I'd be comfortable doing eurocharged tune and Eurotoys pullies knowing that one puts out more boost than the other as well?

If there is other reputable dealers who sell handheld units I'd love to know, browsing this forum is a bit difficult with so many different configurations of F-Types and owners.

:P

 

11.44 is quite the time. What was your method for launching/shifting? That's the fastest, stock F type time by far. If you provide the slip, mods can put you on the list.

I would push you towards checking out VelocityAP's tune and pulley setup. They are the general favorite on this site, and offer an 11.8% larger lower pulley, as well as an upper pulley if you want both. Though I will say there's nothing wrong with Eurotoys.

I just installed the lower pulley last weekend (had their tune for a while) and plan on taking it to the strip tomorrow if the weather holds out, so I can get you a time then. Its significantly more powerful than stock, probably somewhere in the 75-100hp region.

 

Our lower pulley kit comes with more than just 1 pulley; large crank pulley/idler pulley/belt/instructions. Our pulley is also made from high-strength/lightweight aluminum and then hard anodized black. Our crank pulley maybe weighs 1 lb, some competitors pulleys are up to 7 lbs.


BTW, we have been making Jaguar performance parts since 2002! Have been making 5.0 crank pulleys for about 6 years now, not exactly new on the block.

 

BTW, 11.44 is a really strong time, you must have had good conditions.


Mike

 

So what is the weight and material of the stock crank pulley ? I see these veiled suggestions that the extra weight of competitor pulleys is potentially a bad thing.

I'm not an automotive engineer, so lets get this out in the open, we know modding carries some risk (apart from the dealer finding out and nixing your warranty) but how does this stack up to increasing the odds of engine failure ?

Does the V6 3.0L even notice an extra 6lbs on the crank ?

 

Yeah, this. Not to mention that trap speed, this is by far the best run from a stock R that's been noted.

Was it at a track? Got a timeslip?

 

A couple of things here:

1. The OEM Crank Pulley is damped. While I don't believe there to be an significant risk in removing that, there's a big advantage in a heavier steel pulley in mass damping vibrations being transmitted from supercharger to crankshaft.

2. We put this one out to a poll, on what materials people preferred. 304 Stainless was the overwhelming favourite.

3. A V8 Crank is probably IRO 50lbs. Add in flex plate, clutch pack, rods, pistons and in the case of the V6, crank counterweights, and you probably have 100lbs of rotating mass in the engine crank assembly + more for timing chain, cams, and the supercharger. 6% difference in crank rotating assembly weight is not going to be noticeable by anyone on an engine of this size, and probably not on a dyno either.

4. All of our pulleys are individually neutrally balanced within very fine tolerances. Balancing is very important in terms of vibration & engine longevity.

5. If anyone wants Aluminum, we can just as easily run these off. Just PM me if you want one

 

2.75 lbs. Aluminum with a rubber dampening donut in the middle.

 

Extra rotating mass is ways going to make an impact, however in this case its probably not noticeable. The closer the weight is to the axis of the rotation, the less affect it has on the rotating mass. All things being equal, the crank pulley is still quite small in diameter, and as Stuart said, extra weight in the pulley will help with dampening of the crank.

In my opinion there is no wrong way to go here. A light pulley may get you a little extra horsepower over a heavy one, but it won't have the same dampening ability. Choose which you care about more.

And with that, i'm off to the strip!

 

The extra belt length adds into the dampening also. We were around when Jaguar started doing this to their crank pulleys (long before the 3.0 & 5.0) and have been making our design ever since with 0 issues.


If someone would like a heavy crank pulley, we can make that too.


Mike

 

Awesome - each vendor offers to build the others product ;-)

Seriously, thanks for the ELI5.

 

Great!
I'll be interested in a aluminum one in a month or so...

 

Sorry guys, no pictures of the slips, since it was stock and didn't think the time was that fast, they did make me rent a fire jacket for breaking 11.5, almost did an 11.3 one run. I remember the numbers though. 1.74 60 ft. 96mph in the 1/8th. I'm going again tonight with a friend.

 

I thought you sold your car?

 

interesting. My 11.63 run had a 1.78 60 ft. and 95.75 mph in the 1/8th. This would suggest all the time you made up was on the top end. Get a slip this time if you can.

Subsequently I've had two runs so far today. One I spun the tires in second, the second was 11.5 with an unknown mph. Conditions aren't great at 81F w/ a moderate cross wind.

 

What's with your 1/4 MPH???

 

Timing has been accurate for everyone, but the mph isn't always registering for whatever reason.

 

11.5 at 6.11 mph. I guess the story of the tortoise and the hare was right. Slow and steady!

 

After a long day at the track in which I only got 4 runs, I've learned two things... 1.) don't go on a Saturday and 2.) I need better tires. Two of the four runs I got wheel spin in 1st or 2nd gear and traction control kicked in to steal power. On the other two runs I did best my stock 11.63 quarter mile time as expected with the new VAP tune/lower pulley combo. Temps were in the low 80s with a pretty moderate cross wind; once I switch over to MPS4S tires and get a better day weather wise, i believe i'll lower this time by a tenth or two.

 

Just ran 11.37 stock!!!
just at the track.. ran a 11.37 stock!