Timing?Fuel?Injectors?Nuclear?I dont know how to fix this.All help welcome!

[karism]

Halo Everyone,I have been busy for some months now, trying to get the CA to run proper.

Specs :RPS13 200SX CA18DET : Engine overhauled 7k miles ago.(I suspect it does have NA pistons in, or the head was skimmed too much) Safari T25 Turbo (replacement) running aprox 7PSI boost currently. Stock airbox.2.5”Exhaust. I did not overhaul the engine, I bought it like this.

It starts fine, doesn’t bog or splutter, drives fine except for the pinking.As soon as boost goes above 5 Psi on ¼- 1/2 throttle or so, the engine starts to ping.

So far I have tried the following to rectify it(at different times, not all at once)

1)Replaced the fuel pump with a new high flow Bosch unit.2)Replaced the fuel filter with a new one3)Replaced the plugs with BCPR7ES-11. (1 grade colder than stock)4)Retarded the Cas timing aprox 7 degrees running on 95 Unleaded5)Removed injectors, and had them cleaned. (Not reinstalled yet, will happen tonight)The injectors didnt have much dirt in them,and the spray pattern was very good!6)Ran diagnostics on the ECU, and the ecu threw the knock sensor code (Found out RSA Ca18det`s didn’t have knock sensors) so I ignored it.

I though that perhaps I should have a look at the factory timing map.

*Please refer to the attached map of a stock CA18DET*

I marked the area where the knock occurs.Is it running to much timing,looks to aggresive for something with a 9.5+ Compression ratio???

PLEASE! Help, I don’t know what to do anymore!All help,and suggestions appreciated!

Thanks!!!

[ca18detgabby]

it doesnt have a nock sensor? why?

how is fuel pressure doing?

sounds like maybe a bit too much timing but idk.

[karism]

Well,iam not sure,but i have seen a few of them here,and none of them had knock sensors?

Fuel pressure was a bit low,so i bumped it back to standard FSM pressure.

I installed the cleaned injectors (only took 2 hours,hahaha)

Took it for a quick spin.It is a bit better.It only started pinking at about 7PSI this time.which is an improvement!

I also think the timing is a bit much!I mean the higher end of the scale is 61,when its already boosting.

[r34 gtr]

Yeah, if the head has been milled a lot, and/or it has higher comp. pistons in it you will probably need to dial out a little bit of timing. Try pulling a few degrees and see if it doesn't sort it out.

[karism]

Hmmmm!You think i should take out more than 7 deg that i have already?

Thanks for the ideas so far!

[r34 gtr]

If it really does have 9.5:1 compression pistons in it, you'll have to take out a good bit.

[bentvalves]

yea dood keep retarding that CAS till it stops knocking.

there was another fella on here with that same issue, and thats how he (we...nico) sorted it.

[karism]

Thanks.I`ll retard the timing some more,and give feedback about it here!

[karism]

YAY!!!!!!!!!!

So this evening i decided to have a another go at the timing.

Previously i wasn't using a adjustable timing light.(Didnt have one at my disposal,so i just adjusted the timing accorcing to the 15deg mark)At home i have one,and that is what i used tonight.

At 800rpm the ignition timing was 27deg BTDC!!I was so shocked i checked it again,and rechecked it.What the hell???Now imagine what it was at before i started retarding it??? :O

I set it back to 17 deg,and took it for a test drive.When you hammer it hard in 4th for a few km it starts to ping slightly(like 1 or 2)

Compared to before,5million % better

Its weird how much more lag it has now compared to before.but man on man does it run!

nothing,nothing,nothing,wooooosssssshhhhh!!!1



I will pay some more attention to it.and see if i can get it 100% right.

For now,i`am very,very happy.

Thanks to everyone for the suggestions!

Much appreciated!

Another happy CA driver!

[r34 gtr]

Great to hear you sorted it out! Have fun!

[ca18detgabby]

getting a good tune and some fuel and you can adjust the timing and kick some arse...

glad to see your rolling good now

[karism]

I think it might be fast enough to have a run against some local bimmers!haha

[Nali]

YAY another african CA running well. most of the CAs i know back home run like dirt.

Go kill those gusheshes

P.S RPS13 = Harch, SR20, S13.if ur car has the CA18 its just RS14...no P.

[karism]

Hahahaha!Thanks.You were right

I have a RS13


Modified by karism at 7:14 PM 9/12/2008