JB4

Scotty89 · 11-22-2014, 12:27 AM

Well I'm not an expert so don't take my words as the truth, but I would expect if you somehow could run a e85 map on non-ethanol fuel, then it would knock earlier than if you had ethanol...

So if the factory knock failsafes are still intact, I'd expect it would just cut timing and/or boost if you didn't put e85 in.

I don't know though.

fo55il · 11-22-2014, 06:22 AM

Would work if u saved the map without e85 and used it and never used e85 but then remember to map 5 if you do.

Is it possible to save the stats?

Socket · 11-22-2014, 06:30 AM

Quote:

Originally Posted by fo55il

Would work if u saved the map without e85 and used it and never used e85 but then remember to map 5 if you do.

Is it possible to save the stats?

My brain just melted trying to work that one out fossil

fo55il · 11-22-2014, 06:31 AM

Its ok babes, will make sense once u get used to your jb

Socket · 11-22-2014, 06:33 AM

Quote:

Originally Posted by fo55il

Its ok babes, will make sense once u get used to your jb

Testercles · 11-23-2014, 04:28 PM

Quote:

Originally Posted by fo55il

Would work if u saved the map without e85 and used it and never used e85 but then remember to map 5 if you do.

Awesome, thanks. Hopefully that could remove some of the variability reported from some users allowing for a smoother more consistent experience.

_ink · 11-23-2014, 04:38 PM

there's an e85 app that can calculate this for you on iphone and android - check it out in your respective app store. I use this regularly.

Socket · 11-24-2014, 04:18 AM

Quote:

Originally Posted by _ink

there's an e85 app that can calculate this for you on iphone and android - check it out in your respective app store. I use this regularly.

Whats the name of the app Ink?? wouldnt mind downloading it

s2kadrenalin · 11-24-2014, 04:52 AM

Okay, this could be a long rambling post, so bear with me.

Yesterday I attended a Circuit and Coffee event at Queensland Raceway hosted by Downshift Aus Facebook group.

I was a bit disappointed to be honest - I lost to some cars I thought I'd beat,a C63 for example (to which I later found out is the fastest NA C63 in Oz!), but only lost by a slow car length over the full front straight to an F430 Scuderia.... yet beat a 997 911 Turbo, every Lexus IS-F, a tuned E46 M3, and every modified Golf platfrom out there.

I newb'd it from 2nd to 3rd at least a half dozen times, twice against a friend of mine. Frustrating as fuck! One guy was go proing in a black Mazda 3 / MPS and I looked across at him like WTF! and he just laughed because it was completely out of the blue, and then I lol'd. Would of made great footage. Anyway....

Problem I suffered was 2nd gear at like 80km/h is circa 4,000rpm. You jump on the gas and before you know it you're already at 7,000rpm after only a few metres and you have to swap gears and punch 3rd. So I'm really not a fan of my gear ratios. Also because it has the JB4 ecu, if you over rev a smidge past the shift light, the JB4 ecu kicks in and sends the car into like a limp mode to protect against the A/F ratios and I had to restart the car. Did that I swear.... 10 times both in pit lane and in between the circuit break points. Then I ran out of brakes on the back straight and *nearly* ended up in the sand pit but thankfully it pulled up in time by about...... 5 inches LOL. Parked it for a good 1/2hr after that and went back out afterwards. My "2nd session" was much more fun and enjoyable though.

Basically, I was disappointed, and expected better. The car felt inconsistent under WOT, the gear ratios felt stupidly short, and I was only running 98 with RB upgrades + accessories.

So after yesterday I'm left wondering. There is no point adding more power and going E85 with the JB4 if I'm just going to run out of gears. Diff gear swap might be on the agenda instead, however the idea of running E85 purely on map 5 with TC off also interests me. With some serious mods, like this car has, can I simply swap to E85, and do some WOT runs on map 5 and have the ecu (or is it a piggyback? Hell I don't even know!) and it will auto tune map 5 to the E85?

I guess I'm also still stuck in the s2k world where more revs = more psi = more faster with a centrifugal supercharger setup and the world of turbo FI and much lower revs making power is relatively new to me.

_ink · 11-24-2014, 06:06 AM

Quote:

Originally Posted by Socket

Whats the name of the app Ink?? wouldnt mind downloading it

https://itunes.apple.com/us/app/e85-...877131777?mt=8

https://play.google.com/store/apps/d...ssel.e85&hl=en

Socket · 11-24-2014, 06:20 AM

Quote:

Originally Posted by s2kadrenalin

So after yesterday I'm left wondering. There is no point adding more power and going E85 with the JB4 if I'm just going to run out of gears. Diff gear swap might be on the agenda instead, however the idea of running E85 purely on map 5 with TC off also interests me. With some serious mods, like this car has, can I simply swap to E85, and do some WOT runs on map 5 and have the ecu (or is it a piggyback? Hell I don't even know!) and it will auto tune map 5 to the E85?
e.

Alpina flash would help if you were running an auto... someone like Scotty or DRJ in fact anyone would know more about manual gearing than me

Map 5 should auto adapt to mods and fuel as far as I know
BTW car sounds like a massive beast

Socket · 11-24-2014, 06:21 AM

Quote:

Originally Posted by _ink

https://itunes.apple.com/us/app/e85-...877131777?mt=8

https://play.google.com/store/apps/d...ssel.e85&hl=en

Thanks Ink dude

Scotty89 · 11-24-2014, 06:35 AM

Quote:

Originally Posted by s2kadrenalin

Basically, I was disappointed, and expected better. The car felt inconsistent under WOT, the gear ratios felt stupidly short, and I was only running 98 with RB upgrades + accessories.

So after yesterday I'm left wondering. There is no point adding more power and going E85 with the JB4 if I'm just going to run out of gears. Diff gear swap might be on the agenda instead, however the idea of running E85 purely on map 5 with TC off also interests me. With some serious mods, like this car has, can I simply swap to E85, and do some WOT runs on map 5 and have the ecu (or is it a piggyback? Hell I don't even know!) and it will auto tune map 5 to the E85?

Maybe you should try e85.

I've no racing experience, but the way I see it, you're always going to have to changed gears at some point. At least with e85 you'll pull that little bit harder while in gears.

Depending on how much extra you get out if it with e85 (and yours sounds heavily modded!), you'd probably find you can get out of lower gears earlier from exiting turns.

Short of swapping out your final drive ratio (which I'm not even sure what else is available for these??), I don't think you can fix the short gear problem.

Next best thing to do is get as much low down torque as possible in the next higher gear... if you've not tried e85, what else have you got to lose? it's like a free mod.

Edit: And yes, just fill up with some e85 (about 20L max in 60L tank if you still have factory low pressure fuel pump), then do some WOT runs through the full rpm range. Most do it in 3rd, as in 2nd you will just spin like crazy (and the car won't learn well). You need to do it with DSC/DTC off, otherwise it will cut throttle/boost on slip and not get a smooth run.

I have read that you need to run about 60% ethanol to run the race map 7 which targets 17-18 psi. I believe this requires you to upgrade the low pressure fuel pump, as ethanol fuelling requires a lot more volume flow for the same power. I've never tried this as I don't have the setup, so you might want to research it some more.

Edit2: And for your perusal, here is a video of a RB turbo 335 rolling start against a GTR. Granted, he is running methanol injection, but still if you get your car sorted, I think you'd start walking them at the next cars and coffee meet

s2kadrenalin · 11-25-2014, 04:37 AM