Today I went to get my RB30 tuned, it has a lt8s microtech single coil and dizzy setup. When we went to set the static timing at 10 degrees the timing was locked thru the computer as you do,but when the timing light was on the motor when you reved the engine it would still advance and i mean ALOT probably up to about 50 degrees! to the point where it would backfire as it tried to fire the cylinder before. The laptop reads the timing as 10 degrees fixed and does not change when you rev it but the timing marks on the crank tell another story, there is no play in the dizzy or harmonic balancer and the advance is very smooth like its being controlled by the microtech. So at the end of the day we could not get any help out of microtech and could not tune the car either, if anyone has any ideas or has ever come across this before any input would be appreciated. Thanks Christian

what happens when you take the lock off?

Quote: Originally Posted by airbagsVL what happens when you take the lock off? Same thing still wont rev and backfires at around 3500, when you first turn the lock on the revs drop slightly and it comes down from 15 degrees( high Idle) to 10 degrees on the computer and settles down but as soon as you rev it the timing advances up to 50 odd degrees depending on engine speed but only on the timing light the timing on the microtech reads 10 regardless. We have also tried 3 different timing lights.

Are you running standard CAS sensor? Change the trigger angle from + to - or from - to + This is normally an issue when using a reluctor sensor not a hall effect like in the RB. Be aware yo will have to reset base timing when yo do. Are you runnig CDI?

Quote: Originally Posted by HYPED6 Are you running standard CAS sensor? Change the trigger angle from + to - or from - to + This is normally an issue when using a reluctor sensor not a hall effect like in the RB. Be aware yo will have to reset base timing when yo do. Are you runnig CDI? The CAS is standard and there is just standard ignition parts, no CDI, im pretty sure Matt played around with the CAS reference and bits and pieces but not sure about trigger angle, i'll have a play this morning, going to put a mates lt10s in today and just see what the timng does when thats in as that will rule out the engine as the problem or the computer. Thanks for your reply. Christian

Any news?

Quote: Originally Posted by HYPED6 Any news? Not yet mate ive sent it back to microtech for repair as its the only possible thing that could be wrong so ill keep you posted, I brought an ltx12 in the meantime anyways but it will be interesting to see what it was.

Quote: Originally Posted by HYPED6 Any news? OK problem fixed, the computer is second hand and and configured to run 3 x 2 output coils as it is an ltx8 BUT the fellow had wired it to run a single coil setup using the tach output as a trigger wire into the igniter! anyways all rewired now and just waiting till computer turns up from microtech to run it with the new coils. Wish me luck!

Good to hear, Keep us posted

Quote: Originally Posted by HYPED6 Good to hear, Keep us posted Had the car on dyno last week and made 355 rwhp on 18 pound, with a powerglide and 4200 stall, we went to queensland raceway on friday night and thrashed the crap out of it and drove home without a hitch! Im pretty happy as the motor has done over 180000 k's! Now I want it to blow up so I can build a bottom end and put some real boost into it and aim for 10 sec zone. Ended up using an AU falcon coil pack which works great the only thing is the two outer pins on the plug need to be reversed compared with the EF diagram that microtech has but using the AU one its smaller and you can use your existing plug leads, Its throwing a 1-1.5 inch spark too out of the lead!