I'm ready to plunk down the $$ for the 10 lb kit, and whatever other stuff that goes best with it. Thanks Jackson Racing, for being such badasses!

 

Sounds like we have 2 kits SOLD on the East Coast!

 

Really considering the 5lb kit. Spoke with tuxedo Motorsports this morning. They are the only authorized dealer/installer for JR in the northeast. They are the ones installing my myth crank pulley and they said that JR rules when it comes to superchargers. Very reliable.

Maybe they will be putting ina a five lb kit for my A/T in the future if someone comes out with a A/T tranny upgrade.

 

Where is Tuxedo Motorsports located and how much are they charging for the SC install?

 

Looks to me like the rev limiter has been raised to around 6750 just in case everyone missed that. I like it, I'll have to get one.

I'm thinking the 5lb s/c would be a nice start. But then how much is it going to cost to upgrade the 5lb to a 10lb setup later?
That would consist of what?
A bigger Rotrex s/c unit?
Or just the Hondata reflash, revised Jackson Racing electronics, and bigger injectors?

My warranty will run out the end of 2007 anyway with the miles I put on the car. But I don't know if I can wait that long. May just have to void the warranty and cross my fingers that looks so sweet.

This has got to void the warranty, am I right?

Not that it would stop me, but seriously would it?
2

Also how would this effect gas mileage?
The 5lb and the 10lb?

 

+1

I also have a 2003 Nissan Xterra SE-S/C that requires PREMIUM Fuel because of the Supercharger...Is it safe to guess that adding a SC to the Honda Fit will also require premium fuel to be used from now on?

 

I would say that an upgrade kit at min would have to inclue pulley, fuel upgrades (at least a hi flow pump, if not injectors) and different electronics. I believe that it would still have to use the same s/c unit.

Anything out yet on the 5 lb kit ?

 

Sounds like we have more questions than answers for now.

If that means +1 MPG but it will require premium gas that's not an improvement. It will be interesting to hear all the specifics when they're available.

 

This dyno sheet is why spending $900. on multiple mods for a 12 hp gain is not appealing. Blow it all on this and do it once! (refers back to this golden oldie thread: https://www.fitfreak.net/forums/show...+racing+dreams )
Thanks Jackson Racing!

 

Ok ,so instead of having to replace the s/c unit to get more boost you just replace the pulley. That means the s/c unit is the same for both kits. Right?

They already said what the kits would contain.
"All our kits come with fuel management. The 5lb kit will come with Jackson Racing electronics. With the 10lb, you will have a Hondata reflash, revised Jackson Racing electronics, and bigger injectors." Pardon the quote being out of context (incomplete). They didn't say anything about a fuel pump.

If that's the case then how much for a 10lb kit + the pulley and Jackson Racing electronics module set up for the 5lb setup?

Basically a selectable kit. That way the pulley and electrinocs module for the 5lb could be used to have the 5lb kit and since it has everything for the 10lb kit it would just be a matter of changing the Jackson Racing electronics module to the revised module or having the revision done, doing the Hondata flash, and changing the injectors to convert it to the 10lb kit whenever ready to do so.

I would like to boost it 5lbs for the first 75,000 to 100,000 miles then raise the boost to 10lbs. Think of it as an extended break in period.

Even if someone only wanted the 5lb kit. It would still be nice if they decided to sell it to be able to say it's been boosted 5lb. But here's everything you need to boost it to 10lbs if you want even more power. I think it would make a good selling point.

Still curious about the MPG being effected and wether or not it would require premium gas with the s/c.

I would think that with more HP it would get more MPG. Since there would be little weight change as compared to the HP increase shouldn't it be easier for it to push it along?

I know that with the 10lb kit you would change to larger injectors. So obviously it would be using more fuel.

But since the 5lb uses the stock injectors and the added HP is from FI raising the compression with the same amount of fuel wouldn't that mean better MPG? If not then why not? What am I overlooking?

Do you have any other pics of the s/c engine from different views? Man, that looks soooo sweeet.

Nice job Jackson Racing!!!


I'm even considering selling my 2005 Suzuki King Quad 700 ATV with full body armor, warn winch, mud lite XL's, DNA rims, alarm and more to get it. Hey Jackson Racing! You up for a trade? I even have the stock wheels and tires with 0 miles on them. And a custom setup for loading it in a pickup that secures it to the trucks frame for transporting (1 of a kind).

Couldn't hurt to ask.


I still think my $207 racing headers were a good choice. They may not be as nice as the Jackson Racing headers but they'll still work with the s/c. As for the CAI I'm glad I made mine instead of dishing out $200 or more for one. Which I would be regreting now.

 

I asked oscar jr about the MPG with the kits. He said he was getting 41mpg with the 5lb, and he hadnt really been keeping track on the 10lb. He said you should still be getting over 30mpg with the 10lb kit.

 

Did he say if the 41mpg was an improvement from what he was getting without it? The 5lb that is. Doesn't mean much without knowing what he was getting before installing it. I'm averaging about 37+mpg right now.

What about the fuel? Will it require premium?

Thanks JDMchris.

 

A few things. The pulley swap is my guess, but historically, superchargers have always increased output by changing pulley diameter.

It seems that JR will have an upgrade kit, as you are suggesting.

There really isn't a way that a supercharger will increase gas mileage...usually they decrease mpg. At cruise condtions (part throttle) the best superchargers still place a small amount of load on the engine...and at cruise, they usually are not doing anything. And they almost always require the use of high-octane gas.

I have trouble following your logic. The fuel injectors (and perhaps the fuel pump) are replaced to support the increased air flow through the engine, to keep the mixture right. The added horsepower is created by pushing more air/fuel (than would occur at ambient pressure) through the engine at any given RPM. Fuel injectors do not raise compression of the engine nor do they directly make more power...they are sized in consideration of the engine's air flow capacity and duty cycle.

 

OK, lets see what I can answer...

Vehicle Warranty:
The warranty on your vehicle is obviously void when you install our kit. You are modifying the car beyond the Factory intent...there is no way to get around this. With that said, you might find a dealer that overlooks the supercharger... but don't count on it.


Fuel:
All Jackson Racing kits REQUIRE 91 Octane Premium fuel. There is no substitute.


Electronics/Misc. in Kits:
The 5lb kit uses-
Jackson Racing Electronics

The 10lb kit uses-
Hondata Reflash
Revised Jackson Racing Electronics
Big Injectors
10lb Pulley
10lb Belt


Fuel Mileage:
Fuel Mileage is all dependent on who is behind the wheel. OUr kits are efficient, and are famous for being able to keep good fuel economy at cruise, closed loop state. But like I said, who is driving?

Example: The 5lb kit fuel mileage has ranged from 25-40 MPG depending on who was driving. Our sales staff got a whopping 25 MPG, while Oscar Sr. got 40.
-Drop clutch starts and 110+ MPH... 25 MPG.
-Cruise speed travel and light boost driving...Higher MPG.

The 10lb kit has not been tested for mileage. Expect gas mileage to go down. If you have bigger injectors, you will throw more fuel into the combustion chamber in boost. This is where you lose your fuel mileage.

Remember, fuel mileage is based on the driver... Your current "Fuel-Friendly" Fits can reach below 30 MPG... if you are at 100% throttle position for extended periods of time, driving the wheels off if it! The problem is, when you have boost, you want to be there all the time!

Hope that answered a few questions...

-Oscar Jackson Jr.

 

Yeah, make it spin faster for more boost.

Ok, I figured that it would be making more power in excess of what it takes to turn the s/c then there would still be HP available to move the vehicle. What you're saying is that it's similar to a turbo in that it only kicks in when you accelerate so when just cruizing you have the drain of spinning the s/c unit for nothing. Got it.

Perhaps when I used FI for Forced Induction you may have thought I meant Fuel Injectors. I know that we're adding more air by Forced Induction thereby raising compression, so more air means more fuel has to added to keep the mix right. They said nothing about needing a different fuel pump in their post for either kit.

I'm sure the Jackson Racing module makes it do that by way of the injectors. The 5lb kit uses the stock injectors like you said rated by flow capacity. So they can only deliver so much fuel before larger injectors would be needed like for the 10lb kit. That much additional air would require more fuel. Got that too.

I was thinking that since the stock injectors worked for the 5lb that it couldn't be requiring that much more fuel to produce the additional HP since they are "flow rated".

Basically thinking that if it had a bigger engine say the K20Z3 swap but the vehicle weight was still the same, wouldn't it get better mileage?
More HP and no increase in weight = more mpg
That was the comparison I had in mind. I wasn't thinking of the s/c drag.

So on a long flat trip the cost of spinning the s/c would cost you. And on a hilly trip it would be advantageous since you have the extra power for climbing the hills and the drag of the s/c would slow you on the downgrades. Right?

Got it. Thanks

 

Thanks

I live in a hilly part of the Country so the boost would be nice going up hills no doubt.

When you say "cruise speed travel at light boost". Now that's what I'm talking about. At 70 MPH on reatively flat ground. Will the 5lb s/c provide light boost?

Considering the drag coefficient of the Fit. That would be optimal for effeciency. And that's where I could see a s/c being more fuel efficient than without.

Assuming I could keep my foot out of it.

 

Yep, I thought you meant fuel injectors. The fuel pump is often changed in super or turbo charged applications...the Fit pump evidently has enough capacity to suppor the power levels we're talking about.

To correlate an increase in engine displacement (and corresponding power) to an increase in gas mileage isn't really correct, especially in cruise conditions. I love the V8-powered cars with gobs of torque down low, but these burn quite a bit more fuel than a 1.5L honda engine! With more HP you must burn more fuel, all else held constant. WIth greater displacement, you must burn more fuel, again holding all else constant.

Think of it as x amount of work needed at a specific RPM (determined by gearing) to keep the car moving on a level road at constant speed. If X is calculated to be 20 hp, and the stock engine supports this, how can increasing power (by whatever means you'd like, turbo, swap, etc) get you better gas mileage?

From what I understand, Honda designs their engines with the philosophy of producing 'just enough' power at low RPM for cruise conditions to overcome vehicle aerodynamic drag, thus maximizing fuel efficiency. So for the cruise scenario, any added power begins to get wasted, and gas mileage would suffer. But for the acceleration scenario.... That is why I like the JR dyno charts...gains are really super above ~3k, but hopefully down low, the torque is slightly better but not by much...this means that I can get the car in 5th and get great mileage, and put it in 2nd, and get fast!

 

Not to try and nitpick, but he didn't say that... he said:

-Cruise speed travel and light boost driving...Higher MPG.

Meaning occasional 'fun'. I'm not a 'know-it-all' with superchargers by any means, but they are usually regulated with some form of bypass valve which is tapped into engine manifold pressure. The pressure drop (gas pedal down) closes the valve and the boost goes on...so really the compressor impeller is close to free wheeling at cruise (hi vaccum). Experts, is this right? I'm too tired to look it all up at the moment!

 

So we've seen dyno graphs for the 10-lb kit and for an NA setup a couple of times in this thread. It sounds like Jackson Racing handed out these graphs at SEMA, but they didn't hand out anything for the 5-lb kit.

Jackson Racing, any chance you could also provide dyno results for the 5-lb kit?

 

Of course this is correct...bad choice of words. What I was getting at was that the pressure (hence load) on either side of the impeller would be relatively equalized at closed or part throttle cruise due to the bypass valve being open...this essentially means no 'boost' and a relatively small drag increase on the engine.