umm, snap on have a timming light gun which can show you rpm

 

when my coilpack redtop corsa was dyno tested its rev limit was 7200

 

I would of expected it be nearer to 6750rpm???

 

6800 standard, 7500 for the Group N Chip.

 

Hi i do have a engine speed tach gun i still have to check this any one know what the ecu uses to sense the speed i.e crank sensor or distributor as this might point me in the right direction cheers

 

Crank sensor

 

Dizzy (earlier type) 6750
Later DIS/Coilpack varients 7000

If its over that (rev counters arent 100% accurate) it will be chipped.

 

Red line on mine is 7k - whilst I don't know how accurate (?) that is, the limiter cuts in exactly on the line.
Before you go too far, I'd recommend using no more that 7k until you can check the accuraccy of the tacho' (any instrument specialist will be able to check and, if required, recalibrate it for you AND you know exactly what the internal spec of the engine is.
Then you'll have an idea of what the engine can actually be turned to with a good expectation of reliability.

 

i have the early type engine out the astra gte mine goes straight off the clock to but when i put it on the rolling road it revs upto 7500 but they said to get best power output change at 6500 an it seems to be doin the job just remember goin all the way to the limiter aint always better

 

if it doesnt make anymore power after 6.5k then like you've said, theres no need to rev the arse off it and potential wear components out quicker.

 

second that^^^ you lose power after 6250-6500, so acutally your just wearing down components for no reason. hence limiting the engine life.
unless you have your car chipped, raising the rev there is no point bouncing your rev pointer.

 

hi thanks for all you replys i am happy changing up at 6500 all day long i was just trying to see what the limiter would cut in at just incase as a few friends dive it on track days and i would not like them to be overreving it does the css control the limiter

 

Regarding these comments
"if it doesnt make anymore power after 6.5k then like you've said, theres no need to rev the arse off it and potential wear components out quicker."
and
"second that^^^ you lose power after 6250-6500, so acutally your just wearing down components for no reason. hence limiting the engine life.
unless you have your car chipped, raising the rev there is no point bouncing your rev pointer"

Seems you don't understand why a shift point will ALWAYS be above peak power unless that corresponds to maximum rpm for the engine which would suggest the customer or builder cocked up the specification.
The shift point should be where the power/torque at the wheels in any gear drops to the same power in the next, higher, gear - what you are looking for is the maximum AVERAGE power. Where the shift point is for any engine/transmission combination will vary - usually even between the different gears.
However, as most engines, especially those not using racing boxes, run out of rpm before the above point is reached, changing at the red line is normally the best option.