Being a happy JB+ owner I'm considering purchasing a Forge BOV. The question I have is they make two types that are apparently suitable for the N18 engine and 2011+ Cooper S. The Forge website is a little confusing (http://www.forgemotorsport.com/conte...102&cat=020102) although two of our most common suppliers sell both for N18 Cooper S vehicles. One model (The "R" model) is recirculatory in design and the other is atmospheric (The "A" model). What are the advantages/disadvantages of each unit? Is there one that is clearly preferred from a performance standpoint? I realize that the atmospheric model will create a significantly greater sound as the turbo back pressure is vented to the atmosphere.

Thanks in advance for your help.

 

The atmospheric one may cause problems with how the car will run. Most cars will start to act funny on the factory tuning when changing from a recirculation diverter valve to an atmospheric blow off valve. Just my experiences with volkswagens and subarus.

 

To answer both above questions.

The forge recirculation valve is basically a stronger and better engineered version of the stock diverter valve. It works in the same way, but is better constructed and more robust. In my experience with various springs you will not notice any significant performance increase, just get a more reliable operation less prone to failure and boost leakage. I have not noticed significant boost differences

The atmospheric valve is different in design. It is basically the same design, but with holes so air vents to the atmosphere rather than recirculates. I have no personal experience with this. Many people have tried it and ended up with cels and codes, presumably due to "metered" air mass being lost from the boost circulation and confusing the ecu. However, there are other people who claim to have run them with no problems. It is possible there are variations in how well this works in different world markets, as some cars have different MAF setups etc.

 

I have had the atmospheric valve for almost a year running without any issues.

 

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I sure hope so!!!!! Haha

 

We're still looking at all options for future upgrades but for now just the JB+ is planned.

 

Small update:
Got the methanol issue handled.

JB+ @ 100% with 100% methanol is good to go.
Timing and AFR's are good.
No more E85 for me, yay!

 

Congrats!!! What was the issue?

 

So could I mix 110 octane(2 gallons) with 93? Or would that be a bad idea? I'm trying to see what options I can run besides E85.

 

I'm no expert but I believe that could work. Just data log once you've put on 50 miles (take it easy otherwise you'll have misfire codes). If everything looks good then have fun!
Another alternative would be to use water meth injection. I fill with 91 octane since I live in Cali and I run 100% meth and the JB+ is set at 100% and the car is running great and the data logs look great!

 

So.....are there any performance gains? If so please share.

 

For whatever reason my P/I trimmer was set to 100% boost bias, which wouldn't be good on a load based car like ours lol.

I set it back to 50% boost 50% IDC and all was good.

 

Well the JB at 100% is pretty beastly lol.

But when comparing E85 with methanol, I've always described it as shot of NOS when it starts spraying. Might be because the car is running on 91, and when it starts to spray the octane is raised close to 100 points, which is needed when I go into positive boost.


Even when running E85 with meth on top, there was a noticeable difference with the system on vs off. The same can be said even when the car was running stock pressures.

I'm just glad I don't have to go out of my way to get E85 and the meth kit was actually worth it. Also no carbon build up for me either lol.

 

How much did it cost to upgrade to run 100% methanol? Any links for set up would be helpful,

Thanks....

 

It's just the kit.
HFS 2,3 or 4 it's an aquamist system.
I'm currently running an HFS 4. The car can except 100% methanol easy. It's very good at adjusting fuel trims on it's own.


I know Terry offers a meth system that's at an even lower price point. Won't hurt the wallet as much lol.

 

Thanks...

 

Yay! Glad you found it and easy fix

 

Seriously, glad the methanol was worth it haha.

Now I just need to get to a dyno when I have some free time.

 

It's all about tuning and how much time you wanna spend tweaking settings. I finally got my subwoofer dialed in right. Only took 20oz of fiberfill, a 1-band parametric EQ and lots of listening to get it sounding decent. And if you open the windows BOY is the bass better

 

So when I move the position to 2, do I need to put the car to sleep again for 15 mins? And then plug the JB+ back up until it adapts again over the 100 miles? Thanks.

 

I don't even unplug it. I open the case and just turn the dial. It doesn't really need to adapt.

 

The kit is next on the list. I'm thinking of going with the HFS-4.

Currently I using Torco octane accelerator which costs $20 per can and I use 1 can per tank, so the pay back is about 1 year and if you factor in the cost saving of not having to carbon clean than methanol is a great investment.

 

Cool, thanks!

 

So I add 32 oz bottle of Torco Octane Accelerator to a full tank of 93 octane gas which should raise it 8 points to ~100 octane.

I increased the JB+ to 3 o'clock and did some data logging. First off the outside temp was 42 F and normally when the JB+ is set at 50% I'd be boosting to about 13 psi at that temperature so turning it up to 3 o'clock saw an increase of about 1.5-2 psi. Everything looks ok to me but I'll keep an eye on it.