202 turbo

[seal12]

removed vacume advance line and yes the timing still climbs by what looks like another 15mm maybe with a rev so either my dizzy is not locked at all or the ecu is controlling the timing,
but if this was the case then wouldnt the timing increase to as much as 66 btdc when i use a standard vn chip to run the car? because it obviously doesn't or it would be pinging its head off right?

[antus]

no, the 66degrees is the reference angle. this means the engine is at 66 degrees when the ecu sees a reference pulse. its kind of like a global offset for the timing. as your distributor will be sending pulses at 10 degrees you need a tune with the right angle. right now your timing is probably under ecu controll, but wrong. also make sure your distributors advance is locked.

[seal12]

ok that sounds probable but doesn't explain why the tuner could not work that out as he cant be spoken of more highly when it comes to working with this system for all i have heard.
anyway time will tell as its being sorted next week and if it comes down to the tune being wrong due to incompetence then i obviously wont be impressed.
thanks for all the advice as ive learnt a great deal in two days of becoming a member on this site and only wished ide done it sooner.

[vn5000]

It really depends on how the base timing has been set.If the base timing was set staticly then yes timing would be way out , but if timing was set in diag mode then timing will be correct but the dizzy posts/rotor button wont be in the correct position.

[vn5000]

Also i had a look on you tube at your HR ,thats one cool piece of machinery youve got there .Im actually really looking forward to tuning it.
Nice work.

[Holden202T]

15mm is alot of timing! if you think about the timing .... 10 dgrees is probably less than 15mm so your probably looking at 25 odd degrees of timing at 15mm .... add to that vacuum advance and that aloT!!!

i'd be leaving the vacuum advance disconnected, then it probably shouldn't be too bad, but i'd also recommend keeping it out of too much boost tillyou can get some logging done!

[seal12]

thanks! that hr is a bit of a custom job with a bit of this and a bit of that thrown in but i reckon it looks about right, it has been along time in the making and get most of my attention which the partner is not very amused with
with the 15mm advance yeah its probably around the 25 28 mark so that means my dizzy is not locked or the ecu is actually controlling the timing right?

when i remove the vaccume it runs real poor with misses and stumbles etc with the base of 10btdc which i have manually set it at to keep it safe in boost,
i wont be driving it until vn5000 gets a chance to take a look and if it is my dizzy not being locked then i hope he has that capability in his bag of tricks as the guy that supposedly locked it is long gone.

i have checked the dizzy and there is no play between rotor and shaft only the top part can be slightly rotated and im guessing that is the vaccume advance part.

[Holden202T]

yeah the vacuum advance moves the outer ring i think .... but if the hose is not hooked up it should stay put ......

when you say you manually get the base timing at 10 is that in diagnostic mode ?

[seal12]

yeah it still climbs with the vacume off and i set the 10btdc manually by turning the dizzy by hand with the timing light, as that is the only way i know.

with turbo size would you guys suggest something bigger for daily driving and a bit of fun then a t3 .50/.63 as this is what i have and it seems to spool really quick and always making noise. i also think it is a cheap imitation as its only new and is already leaking and noisy.

aslo with diff gears i have heard the taller they are the more the turbo will like it and may even be a quicker car for it loads the turbo up or something. i have a supra 5 speed and 3.36 diff so would you think this combo is about right? i dont get long in first gear and sometimes skip it.

[antus]

vn5000 should be able to figure out whats going on and help you get on to 12p so you have a nice tunable package, but i would not be suprised if your timing is 66-10=56 degrees out, and since 360/6 is 60 degrees its probably -6 degrees out and 1 cylinder offset. could speculate all day though, will be interested to hear what is found. being distributor 1cyl offset doesnt matter and there is probably 6 degrees adjustment in the distributor!