rpm cut at certain rpm

allm0t0rGSR · Post by **allm0t0rGSR** » Fri Sep 25, 2009 8:34 pm

set up
gsr fully built top and bottom
w/type r cams
new ngk spark plug bkr7e gap to .30"
and new spark plug wire
tdo4 tubo wish to boost 9
2.5" stright pipe w/n1 muffler

i just got the s300 install on my ecu and tune at part throttle everything is good but everytime i try to run to high rpm the rpm just cut of between 4000 to 5000.... i replace spark plug and the wire because i thought thats the reason why, but after i changed it still doing it... i know my ecu is good becused i sold my old s300 that i am used b4 i sold it for needing some money and i can run it to 9000 rpm with no problem.
and i cant think of anything what is wrong with it....
plsss help me out....

Post by **Spunkster** » Mon Sep 28, 2009 10:08 am

The datalogs do not show a rev limit. Check to make sure you do not have the MAP and TPS plugs swapped and that you have the thermostat housing ground properly connected.

allm0t0rGSR · Post by **allm0t0rGSR** » Mon Sep 28, 2009 11:37 am

i know thats the problem too it doesn't show on the datalog what makes the engine rev limit, the map and tps sensor plug are in the right place and my ground on the thermostat is good too.. my car doesn't rev limit below 50% of throttle but when i over 50% the engine revlimit and when i let the pedal go a liltle bit the rpm goes up again, i just change my tps and the volt is at 0.45 i also calibrate but it still doeng it whenever i over 50% of throttle...

what do you think Spunkster the problem?

Post by **Spunkster** » Mon Sep 28, 2009 1:28 pm

In that datalog yoru TPS never reads over 36%

Wolli · Post by **Wolli** » Thu Oct 29, 2009 8:17 am

i have exactly the same problem at 3700 rpm. did you find and solve the problem?

Wolli · Post by **Wolli** » Thu Oct 29, 2009 8:43 am

this is a log on the dyno. @3700 rpms, it felt like the rev limiter. with less throttle, we came above this point, and it worked fine again. after this dynorun, my engine broke cause of a broken oil pickup. now i have rebuilt the engine, and the problem is exactly the same. any help would be great!

newsoltsc · Post by **newsoltsc** » Thu Oct 29, 2009 9:54 am

I was logging on a private road yesterday and I think this happened to me as well.
It stopped logging all of a sudden before 4k rpms.

I'll post the log later today.

allm0t0rGSR · Post by **allm0t0rGSR** » Thu Oct 29, 2009 5:47 pm

i solve the problem by looking on my oil level n it was low? after adding a oil everything is working again and also check your spark plug?

Wolli · Post by **Wolli** » Thu Oct 29, 2009 10:21 pm

i'm using the moroso drag oilpan and a gt35 turbo, the oil can not be the problem. level is good. what kind of ignition to u use? i have the hi6 from crane with the lx92 coil and ngk bkr7ey plugs, allready changed.

fly_n · Post by **fly_n** » Fri Oct 30, 2009 11:35 pm

Wolli wrote:i'm using the moroso drag oilpan and a gt35 turbo, the oil can not be the problem. level is good. what kind of ignition to u use? i have the hi6 from crane with the lx92 coil and ngk bkr7ey plugs, allready changed.

that looks more like ignition misfire or mechanical problem rather than rev-limiter.

my guess is your motor broke from the shitload of timing your running on top of 20odd pounds of boost,not the oil pickup.....

Wolli · Post by **Wolli** » Sat Oct 31, 2009 11:51 am

i have no knocking!! and there was a metal sheet under the oilpickup, which broke away from it. so my rods got no oil and failed. that was the problem.
but what has the oillevel to do with the revlimit?? i know that the vtec will not switch with to less oil, but a revlimit?
and i changed to the ngk bkr8eix today, but no change.

pvt_awol · Post by **pvt_awol** » Tue Nov 03, 2009 12:23 pm

I would love an answer to this as well. My car started doing this EXACT same thing.

I find that when I enable secondary tables, it goes away and the car runs fine. But the secondary tables have NEVER been used before, and they weren't tuned.

Still, I don't see why this is a problem. It started after the last firmware update.

newsoltsc · Post by **newsoltsc** » Wed Nov 04, 2009 12:32 pm

newsoltsc wrote:I was logging on a private road yesterday and I think this happened to me as well.
It stopped logging all of a sudden before 4k rpms.

I'll post the log later today.

Here is my log. Sorry for the LONG delay.

It only happened this one time though. Going to the tuner today and I'll get another log.