Has anyone had the fluctuating load sensor woes with these things? Just made 303kw@ 17psi, but the mixture would change from pull to pull causing it to go lean and rattle when everything was perfect the time before. Its an LT12, X6 etc. Stock engine, GT35 and wade cam. Its looking like a good wheel chock at this rate.

id be more looking at injectors...

Nothing to do with injectors, timing is changing too.

maybe a haltech with fix it shane, you no you want too Some original photos have not been recovered yet.

Over 300 @ 17 psi is good going fark. Twin cam?

Quote: Originally Posted by Shane_954 [View Post] Nothing to do with injectors, timing is changing too. another guy on here copped that as well, have you got a log of it?

No log, when it went lean we quickly threw 6% in the mixture trim and it was somewhat close....its a big change, will cost me an engine. Its still sitting on the dyno, might log a run tomorrow.

Quote: Originally Posted by Shane_954 [View Post] No log, when it went lean we quickly threw 6% in the mixture trim and it was somewhat close....its a big change, will cost me an engine. Its still sitting on the dyno, might log a run tomorrow. so it did blow your engine? what bar map sensor do you have? to be honest my view of microtech is quickly heading down the toilet, my experiences with them 2 years ago is nothing like what im experiencing now TERRIBLE customer service feedback im hear of as late isn't good i just hope once i eventually do get my car going i don't have to go through this either, i've got a built in data logger so i'll record what ever tuning i do and let you know if i come across any issues i've also got a base rb30 LT8-s map for anyone needing it, set as an excel spread sheet because the only way to up load them is via a hard copy on either laptop dongle or hand controller (or punch it in manually from the sheet)

What caused it to shoot lean? MAP sensor craziness? or voltage drop from the altenator?

Could be something to do with the crank angle sensor. It may be on its way out and having difficulty getting an accurate reading, especially at higher rpm. If serious engine I would be looking to instal an external referance off the crank or cam wheel and disregard the disributor CAS.

mm i had a prob similar to this but was more the timing fluxuating..went to a crank trigger and fixed it all

get a motec Some original photos have not been recovered yet.

Quote: Originally Posted by Petros [View Post] get a motec haha i knew you'd dive in with that Some original photos have not been recovered yet.

MicroJunk..........not the best, but im sure you'll be able to fix it.

Hasnt blown the engine, but its not ideal. No good at the track like this. It was changing dramatically just as it was coming onto boost, the mixture would be lean by over a full point and tuner said it was rattling. Its coming on strong with the .82 rear and making 680nm at the engine. Still stock n/a engine, untouched apart from cam and springs. Cant see the crank sensor causing the issue as its tempramental from pull to pull, with perfect mixtures for most of the runs but on the odd occasion this problem would occur.

Quote: Originally Posted by Shane_954 [View Post] Hasnt blown the engine, but its not ideal. No good at the track like this. It was changing dramatically just as it was coming onto boost, the mixture would be lean by over a full point and tuner said it was rattling. Its coming on strong with the .82 rear and making 680nm at the engine. Still stock n/a engine, untouched apart from cam and springs. Cant see the crank sensor causing the issue as its tempramental from pull to pull, with perfect mixtures for most of the runs but on the odd occasion this problem would occur. depending on when it comes on boost what valve springs your running etc you can get timing jitter from the timing belt and it varies pull to pull just run a **** load of fuel and trim it to accomodate for worst case scenario, no point being jewish with the fuel supply to make a little extra power

Maybe check the map sensor line that the ECU is getting a good signal. Also TPS switch may be tempermental and can cause ecu to flick between map points. Possibly check your earths also, but bit of elimination process I guess.

Log a run. If the Load/boost signal is fluctuating then put a very small restrictor in your map sensor line. This will help the fluctuations. If you are getting timing jitter, and this is very easy to test. Lock the timing in the microtech, Grab a timing light, rev the engine slowly through 2k to 6k and watch the timing. It will jump all over the place. If this is your issue, Put a crank trigger on it. We deal with these on a daily basis, and you wont get them perfect, but you may get a respectable level of tune. And they are useless at wheel chocks. Too flat, most things just roll straight over em

hehehe you knew I would Some original photos have not been recovered yet.

hyped6 what size restrictor do you recommend to put in the map sensor line? We need to do with with my brothers car is the signal is all over the place