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Dissapointed in JB4 Performance, Questions?
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06-05-2011, 05:05 PM | #1 |
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Dissapointed in JB4 Performance, Questions?
I drove a JB4 equipped 335 sedan today, it was an automtic w/o sport package. I honestly could not tell too much difference at all between map 0 and map 1/2. The owner of the car mentioned he ran map 7 with just downpipe/exhaust and he even ran map 7 bone stock after he removed bolt ons.
Wondering if this is normal, was his motor hurt by running map 7 without supporting mods (meth, FBO)? Or does the JB4 just not add as much HP on an auto? I was surprised as most the reviews I read about JB4 are glowing with people saying the difference is HUGE. |
06-05-2011, 05:12 PM | #2 |
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that's weird, stock PSI is around 6-7 PSI, map 1 is 13 I don't think there's much difference but you would absolutely feel something, map 2 is 14.5 wich should be more noticeable, I wonder why you didn't feel the difference....
Running map 7 on a stock car is a killer, I used to have sometimes timing drops with FBO and meth on map7. I can't imagine the timing drops on a stock engine with no meth or anything.
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Last edited by Elie335; 06-05-2011 at 06:16 PM.. |
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06-05-2011, 05:18 PM | #3 | |
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06-05-2011, 05:20 PM | #4 |
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06-05-2011, 05:21 PM | #5 |
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Yeah I was really surprised, I rode in a Cobb 135i with some boltons and it was fast, much faster than my stock 335. It's also about 95F here in Dallas so maybe the heat is making a difference? The oil temps on the auto car I drove were around 250 and my car is around 220 usually.
Was really surprised not to feel a big difference at all. It was small enough of a difference that one time I thought it was in map 2 and it was actually map 0. I told the guy he shouldn't run map 7 bone stock, will probably mess up his car but he said it's not a big deal and he usually does it to mess with Corvettes on the highway etc. |
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06-05-2011, 05:22 PM | #6 | |
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06-05-2011, 05:24 PM | #8 | |
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Is it mainly the transmission? I should be able to tell instantly if I put a JB4 in my 335 right? |
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06-05-2011, 05:24 PM | #9 | |
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Also, FYI, with hotter temps, the JB4 won't be raising the boost higher and higher like most of the flash tunes.
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06-05-2011, 05:24 PM | #10 |
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The heat is probably taking away some power but still, you should definitely feel the difference between map 0 and 2... 8PSI<<14PSI
GOOD NEWS GUYS! apparently knock is not a problem when you're on the highway!!!
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06-05-2011, 05:26 PM | #11 |
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Uh, map 1 is 13 psi, so it's a pretty big difference. I definitely noticed it in mine. I'm assuming OP waited for the oil temp to warm up?
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06-05-2011, 05:27 PM | #12 |
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Pretty sure it was a JB4, he said the red power wire was a pain to put in also it had all the steering wheel controls to change maps on the fly etc like JB4. It's hot here in TX. I think the guy is going to damage his car if he keeps doing it unless the computer has some way to intervene and cut boost/pull timing.
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06-05-2011, 05:29 PM | #13 | |
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You would feel lots of difference on map 2 from stock, wich can be felt instantly yes.
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06-05-2011, 05:29 PM | #14 |
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Map 0 and 2 is a huge difference. I have FBO and when I run on map 0 I feel slow as fuck compared to map 2.... Maybe your "feeling" wasn't that sensitive?
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06-05-2011, 05:30 PM | #15 | |
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06-05-2011, 05:30 PM | #16 |
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woops my bad, thanks, corrected.
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06-05-2011, 05:31 PM | #17 |
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np
To the OP - did you have DTC disabled?
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06-05-2011, 05:31 PM | #18 | |
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And in those hot temps, it is cruel to the engine to be running it so hard...tell him to get meth and it will make a world of difference.
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06-05-2011, 05:35 PM | #19 |
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when it comes to piggybacks, I'm a jb4 fan, so I'm not starting a war just telling in advance.
can you explain how could a stock car on map7 NOT knock please?
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06-05-2011, 05:42 PM | #20 |
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try a 0-60 run against him.
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06-05-2011, 05:49 PM | #21 | |
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You wrote "Running map 7 on a stock car is a killer, I used to have sometimes timing drops with FBO and meth on map7, I can't imagine the timing drops on a stock engine with no meth or anything." |
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06-05-2011, 05:55 PM | #22 | |
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