08-04-2014, 08:40 PM | #1 |
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How much Power gain from just jb4?
Hey guys I'm thinking of getting just a jb4 with EWG and ff harness on m235i running just 93 gas. What kinda of power gain do you guys reckon I get from that?
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08-05-2014, 12:16 AM | #2 |
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08-05-2014, 07:40 PM | #5 |
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Drives: 2019 G30 M550i
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Garage List 2019 BMW M550i [0.00]
2021 BMW M3 Competi ... [0.00] 2019 BMW M5 Competi ... [0.00] 2016 BMW M3 [0.00] 2014 BMW M235i [0.00] |
I'm running Map 2 on 93 with EWG/FF harness and managed 351whp/390wtq.
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09-07-2014, 08:26 AM | #6 |
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09-07-2014, 09:11 AM | #7 |
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I have EWG car with MPE and HFC DP. JB4 without FF / EWG harnesses. Running 99 RON fuel I had map 6 mapped on a dyno. I got power and curves similar stock and went from 320bhp/330lbft at crank to 380/450 at the crank. V happy. Car runs really well and goes like a scalded cat !!! |
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09-07-2014, 06:48 PM | #9 |
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Sometimes as I read these posts it seems so hard to get more HP out of our 3 ltr, 93, E85mix, 99 etc. the M3/4 runs a 3 ltr and comes with 425hp....you would think we could get more and still only have to run 91/93 like they do.
I am about to jump into the mod game for the first time.....just trying to read and learn. What is the expectation we can squeeze out of the 235 and still just roll up to the pump, no race gas, meth, mix etc Not trying to be a tool....just thinking out loud |
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09-07-2014, 07:37 PM | #10 | |
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EDIT: when I say stock components, I also mean pump gas |
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09-07-2014, 07:50 PM | #11 | |
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I don't recall the M3/4s turbo's specs, but I'll guess they are each either very slightly smaller than the N55's single turbo or roughly the same size. Companies have barely scratched the surface of tuning them and with few mods they are in the mid to upper-500 RWHP range. Last edited by FC4; 09-07-2014 at 08:11 PM.. |
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09-08-2014, 05:28 AM | #12 | |
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Higher boost demand from turbo will increase EGT's which will be compounded going through stock DP with restrictive cat. ECU will reduce boost and or retard timing and or go into "limp mode" as a reaction to higher/too high EGT's. Freer flowing cats/decat DP helps dissipate heat much quicker away from turbo outlet so EGT's stay within more useable limits. PD.
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09-08-2014, 06:27 AM | #13 | |
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Thanks that make sense PD, I guess I should pick up a DP! |
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09-08-2014, 05:53 PM | #14 | |
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Best time so far in close to 3000ft DA on E30 1s 12.39. Only MOD is JB4(and MPE) on map 7 at 17-18 psi boost. Traps 112 mph off the highway consistently then starts to run slower after 2-3 passes. I am looking for 11.99(then I will stop beating up on the car-hopefully still in one piece- nervous lol) and hoping to get there as weather cools and DA is reasonable. I was trying to avoid down pipe(have a mustang with long tubes and catless-so have noisy car already) since my wife drives the car and may pass on to 16 year old daughter(detuned of course!) After reading above post it may be harder than I though or not possible and may explain why car heatsoaks? and slows down so quickly |
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09-09-2014, 01:47 PM | #15 |
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Does the JB4 limit boost on 1st + 2nd gears? I can't remember where I read that but I could swear I saw it somewhere...
if YES, can that option be removed? With the x-drive version I don't think there will be traction issues for the need to limit boost on those gears? Anyone know? |
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09-12-2014, 11:52 AM | #16 | |
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This option is very useful to control traction when targeting high targets at 1 and 2nd gear. By the way you can remove it by setting max psi boost 1 and 2 to 0 (this is the default value )
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12-09-2014, 05:07 PM | #17 |
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Im interested in knowing this as well.
Can u just run JB4 alone for some more overall power over stock? Or do you really need supporting mods (do, intake, chargepipe) to benefit from the tune? Will running JB4 alone put stress on other components throughout the longevity of the engine? Like if u run the tune alone would it be a good idea to upgrade the chargepipe because it will likely break off under more than usual pressure? |
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12-09-2014, 10:09 PM | #18 | |
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12-09-2014, 11:38 PM | #19 | |
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It is a bit less than the JB4 Stage 2 on Map 1. But it would be less headache on the installation and firmware upgrade etc.
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12-10-2014, 12:13 AM | #20 | |
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Would running it on map 5 push more psi and more pressure on the stock turbos? Sorry for all the noob questions |
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12-10-2014, 12:24 AM | #21 | ||
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I would recommend JB4 Stage 2 if you have plan on the mods that you are going to do. Otherwise, without any mods, the JB4 will be a waste. You can start with JB Stage 1 and upgrade to JB4 Stage 2 if you decided to do more mods.
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12-10-2014, 03:22 PM | #22 |
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So with stock everything, but running E85, what map can I run? Will this be a problem with the stock charge pipe (I've read they can blow out)?
Also getting a xdrive here, so I like the idea a few posts back about removing the boost limit in 1st and 2nd. |
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