Engine pulling back at 3500rpm

dj_dee99 · January 31, 2006, 11:25:22 PM

I\'ve only just got my RX. And I can\'t seem to get it past 3500 revs in 3rd gear (not tried it properly in other gears just yet). The car feels like it\'s pulling back, like there\'s some sort of restriction.

Now, there\'s a Blitz electronic boost control, which I need to find out how to use (will hopefully try to dig up some instructions or something online), but it beeps just before it pulls back, so I\'m guessing that this may be involved in this?

I know it\'s a bit vague at the moment, but any suggestions would be greatly appreciated.

Thanks.

Oh, yeah. It pulls perfectly & hard up till then. I\'ve not kept my foot down after this, just in case it could cause any damage.

jonrx7uk · February 01, 2006, 01:29:50 PM

Try turning the boost controller off and see if that makes a difference. Do you have a seperate bost guage?

dj_dee99 · February 01, 2006, 05:43:32 PM

Yeah. I have a boost guage, too.

I need to find some instructions for the boost controller, really. It says "off" on the screen, but it still beeps and sometimes the display changes red as some kind of warning.

Maybe I should check how to completely switch it off first!!!!!!!!!!

Sorry if I\'m being a bit of a newbie. But it\'s my first foray into this stuff! :confused:

EDIT:

To give a better explanation of what\'s going on. Basically, on hard accelleration, when it reaches around 3500 revs, the whole engine feels like it has some sort of restriction, and starts to pull back and there\'s a "buzzing" (

?? not the best explanation of the sound!!!) noise. Everything is fine if I change gear or ease off the gas. And it has no problem pulling up to 3500.

But I\'m not sure if the boost controller has anything to do with this. One of my mates said it could be the secondary injectors, or could be through some modifications which would need checking.
There\'s a Pivot Air Flow Conditioner, which I\'ve been told is best left either switched off or set to "0". but I doubt that would be the cause.

tyson23 · February 01, 2006, 06:50:49 PM

hi
dj
i had similar type of problem on mine found that it was earth strap on exhaust close to cat, if the earth strap is broken then the wrong signals get sent to ecu and cause probs due to the lambda sensor on manifold see if its that mate if not it might be what this web site is on about take alook at this web page got usefull info on there like 3000 revs hesitation fix
http://www.fd3s.net/3k_hesitation.html

let us know how you get on
i might be able to help further as i am a technician....

dj_dee99 · February 01, 2006, 07:00:47 PM

Thanks Tyson! I\'ll have a look at that and check out some of those suggestions on that site.

Cheers for the info! :Thumbs-up

Kash_ · February 01, 2006, 11:53:21 PM

A freind of mine had exactly the same problem in his 200sx, the car would accelerate fine up 3000 rpm, then.... nothing. The car seemed to back off power and the rev needle wouldn\'t go over 3000rpm. We had a good look in the engine bay at his house, and it turned out one of his intercooler pipes had disconnected from another pipe. It was very difficult to see it and just by chance we found the pipe. Basically have a look at the intercooler piping to see nothing has disconnected. Also check your boost guage, if it does not boost properly when you hit 3500rpm, this would mean you have a boost leak somewhere.

I know its not a rotary but hopefully might help...

p.s. I also heard that this problem can be caused by some earthing problem which can be fixed with a earthing kit?

Kash

Oedipus Rex · February 06, 2006, 09:37:47 AM

If you\'ve got a BLitz SBC ID booxt controller, which it sounds like you have. It bleeps and flashes red when the set level of boost is exceeded and it will cut the boost back within the paramaters set.

Post a pic of your boost controller and if its an sbc ID I\'ll talk you through upping the boost back to the stock levels.

Oedipus Rex · February 06, 2006, 09:39:55 AM

also --- what happens if you push it up past 3500 revs with the accelerator down gently?

Sounds like it could be in limp home mode and need an ECU reset.

dj_dee99 · February 06, 2006, 01:26:51 PM

Yes. It\'s the Blitz SBC. And it does indeed sometimes light up red.

I can ease it past 3000 and then it will usually continue to accelerate after that.

rmagictastic · February 06, 2006, 01:38:39 PM

sounds like overboost and fuel cut to me.

N

Oedipus Rex · February 06, 2006, 03:52:56 PM

Quote from: rmagictasticsounds like overboost and fuel cut to me.

N

at 3k revs, before the second turbo kicks in?

I can\'t see it. I\'ve only ever known a boost cut at around 6 - 6.5k revs, when the second turbo is boosting freely without any kind of control over it.

dj dee, can you tell me what level the boost is at when the SBC flashes red and beeps, it should display it on the screen. I\'m almost certain that the problem you have is the boost controller set way too low and is cutting in waay early.

Martiny · February 06, 2006, 03:57:28 PM

I think you could hit overboost at 4.5 when the second turbo comes on line. 3K is weird though.

Oedipus Rex · February 06, 2006, 04:13:59 PM

If the SBC is flashing and beeping then its definitely that causing the problem. You set it a certain level of boost that is acceptable and if it goes over then it cuts it back very heavily.

dj_dee99 · February 06, 2006, 05:46:39 PM

I\'ll go for a spin tonight and kind take note of everything that\'s happening. The Boost controller isn\'t showing a reading, it says "off" on the left, but still lights up the screen red & beeps.

I have a separate analogue boost guage, although I couldn\'t say how accurate it is, but it does seem to be jumping up to 1 bar pretty fast. I\'ve also noticed that there is turbo usage when I\'m in 5th gear doing around 60-70. As my turbo time counts up & the boost guage is showing some activity.

Also, There Doesn\'t appear to be a secondary feeling of any boost from the second turbo. It just boosts hard from quite low revs.

EDIT: Incidentally, I have noticed that the earth strap from the engine to the bulkhead looks rather pathetic & actually has a tiny spade connector joining 2 parts together. Whether this could be affecting it, as pointed out by Tyson earlier?

Oedipus Rex · February 06, 2006, 05:52:51 PM

Quote from: dj_dee99but it does seem to be jumping up to 1 bar pretty fast

If you\'re at one bar well before 4.5k revs then you\'ve not got a standard sequential turbo set up. Maybe not as simple as I originally predicted, could well be a boost cut.

Out of interest where did you get the car and what mods it has.

Engine pulling back at 3500rpm

jonrx7uk