Emira JB4 Tuning Now Available for I4 & V6 Cars!

[NJemira85]

Just a word of caution. JUBU 460 kit actually turns down the supercharger boost with a larger pulley instead of turn up the boost with a smaller pulley. Here is what they say...

"An important, but usually underestimated characteristic that comes with this JUBU upgrade is the reduction of the supercharger boost-pressure compared to the OEM standard setup. This is applied because the OEM-pistons often can not withstand the high OEM boost-pressures permanently - on sporty driven cars with OEM-setup, the webs of the pistons between the first and second piston ring tend break early.

This performance upgrade is specially designed for customers who - in addition to the extra power - also want to focus on keeping their vehicle as original as possible and do not want to jeopardise the stability of their engine."

Benefits / advantages

• Sustained power increase to +460 hp and at the same time a gentle relief of the engine and compressor by reducing the boost pressure (larger pulley)

It should be noted that the gt4 car pushes 460 w bigger blower on stock bottom end.

Jubu are legit but have some intense thoughts about parts to sell.

Not saying who’s right or wrong.

forged pistons, rods, upgraded valve springs & retainers seem like the way.

 

[sbproducer]

It should be noted that the gt4 car pushes 460 w bigger blower on stock bottom end.

Jubu are legit but have some intense thoughts about parts to sell.

Not saying who’s right or wrong.

forged pistons, rods, upgraded valve springs & retainers seem like the way.

NJ,

JUBU might be wrong about the whole boost pressure thing but I do believe it stems from some experience they had with "webs of the pistons between the first and second piston ring tend break early." Just my opinion. I don't think they are lying about that.

I wholeheartedly disagree, on this idea on the forums that JUBU is just "trying to sell parts." I've taken a real deep dive into their parts shop and alot of the parts they sell are directly related to issues people have had. To share a few examples.

1) The cooling kit. Lotus actually implemented a very similar kit into their new SE.
2) The drive shafts. People have had clean breaks here.
3) Engine mounts. You've expressed the need for this yourself.

When I tried to purchase their Super B battery they recommended I buy from a US supplier (which I did) due to potential risks and high shipping costs and they recommended where to look.

I think JUBU takes a cautionary approach to things which I think is an attribute of professionalism and for me personally I appreciate their perspective.

As far as the price tags, they are a bit high but I think there are three reasons for that.

1). US customers, including myself, we are used to great prices. Most places in the world outside the US have higher prices.

2) A lot of their parts seem to be built in Europe. Higher labor etc

3). They also state somewhere on their website that the prices are higher due to expertise.. thats not a direct quote…. I think people should judge this on their own

Just my thoughts.

 

[NJemira85]

NJ,

JUBU might be wrong about the whole boost pressure thing but I do believe it stems from some experience they had with "webs of the pistons between the first and second piston ring tend break early." Just my opinion. I don't think they are lying about that.

I wholeheartedly disagree, on this idea on the forums that JUBU is just "trying to sell parts." I've taken a real deep dive into their parts shop and alot of the parts they sell are directly related to issues people have had. To share a few examples.

1) The cooling kit. Lotus actually implemented a very similar kit into their new SE.
2) The drive shafts. People have had clean breaks here.
3) Engine mounts. You've expressed the need for this yourself.

When I tried to purchase their Super B battery they recommended I buy from a US supplier (which I did) due to potential risks and high shipping costs and they recommended where to look.

Just my thoughts.

The mounts and the monoballs JUBU sent me are gorgeous.

I’m not criticizing them, but they do seem to be very conservative regarding the stock internals.

I’m not suggesting they are lying.

They also are quite fully priced compared to the stuff at MWR for internals.

 

[sbproducer]

The mounts and the monoballs JUBU sent me are gorgeous.

I’m not criticizing them, but they do seem to be very conservative regarding the stock internals.

I’m not suggesting they are lying.

They also are quite fully priced compared to the stuff at MWR for internals.

Definitely conservative with a high price tag

 

[NorCalEmira]

The mounts and the monoballs JUBU sent me are gorgeous.

I’m not criticizing them, but they do seem to be very conservative regarding the stock internals.

I’m not suggesting they are lying.

They also are quite fully priced compared to the stuff at MWR for internals.

It's definitely worth cross shopping MWR for anyone interested in going all in. They offer a forged short block with the option of cylinder liners to grow displacement to 3.7 liters. They also offer head porting, a range of valve springs, retainers and a host of other options at much more affordable prices. They're also US based. I have no doubt that Jubu offers quality alternatives but justifying their price points is more difficult.

The Emira comes from the factory with a forged crank and rods but cast pistons. It's really the pistons that are the weak link in a boosted application. How far you can push boost with cast pistons depends on a variety of factors but high quality fuel and restraint on boost levels are well advised.

 

[sbproducer]

Will take a look.

 

[Porter]

Will take a look.

I won't dig up the specifics, but vendors like Komotec and Jubu also commonly resell some engine parts that they source from US, UK, and Japanese suppliers. Including Toyota OEM stuff that's cross compatible from other models (ex. titanium valves), and from both Kelford and MWR in the case of certain valvetrain and internals. Look closely at the photos of all the things to get an idea of what might be a match.

It's just a good practice as a shrewd consumer buying hard parts from all the way across an ocean to verify which parts might have originated where you already live.