1jz ignition maps

[240jz]

Hi all,

I've just got back from a power run of my 1jz 240z (running a haltech E6K) after fitting one of lews dumps, to check fuelling. The operator said the fuelling was OK, but there was a hint of knock through his knocklink headphones over 5500 at 1 bar. He had a look at my ignition map and said he thought it looked quite aggressive. Having looked at other maps on here, to me it looked ok. But before I go for another mapping session, I thought I'd ask to see what people thought.

The last mapping session I had, I wasn't told of any knock issues, and I am using the same optimax fuel.

He also made a comment about the off boost/cruise fuelling being quite rich, so I was thinking about getting a wideband lambda and knock detector rather than spend ages on a dyno sorting out my off-boost and low boost maps

These are the two I am looking at:

detalarm:
http://www.roojai.co.uk/detalarm.htm

wideband sensor
http://www.ngksparkplugs.com/product...000&country=UK

anyone used any products like this and have any comments? would be much appreciated.

[thechuckster]

i don't know about knock sensing, but wideband sensors,, you might find these more sensibly priced:
innovate LC1 (2 outputs, should connect directly to ECU so you dont have to log two devices)
techedge (1 output i think)

There's probably an innovate reseller in the UK ... not so sure about the techedge, but it's highly recommended. I ordered an LC1 from the US from DIY Autotune who were faster than any local seller.

Chris should be able to provie feedback on the timing map.

[chris davey]

firstly re knock sensing. I am using a knocksense (funnily enough ) from Canada. It comes with a bosch knock sensor, all cables required and LED warning. It also has an output to go to an ecu for datalogging through the coolant temp sensor (which acts as a safety as temp goes down, fuel will go in). It was $140AU so pretty cheap. It is adjustable so what you do is put it on the dyno once and get the operator to tell you when it is actually knocking through the headphones and then adjust to suit. I also use jaycar super ear kit to listen to the engine.

I use the techedge 2EO for wideband. Also has a datalogging output which is GREAT! I don't think there is a great deal of difference between a lot of them just some extra things.

Re ignition maps. email me at [email protected] and I will give you an excel file to compare against. From the looks of it though, yours runs more timing than mine on the boost transition from 0 to 14psi and up to 5000rpm but at 5500rpm they are the same. Some have said that my map may be a little aggressive at 14psi but I haven't had any issues with it. I was tuned for 100RON plus octane booster but I have been using this map on 98RON plus octane booster also with no issues. (When I say this map, I mean the 14psi boost and above section as I have made some changes in vacuum and boost transition). I have bought mine from very low figures up a bit but yours are still between 2 and 8 deg more advance than mine. You will see on the excel file

email me

[chris davey]

BTW do you have a dyno print out? What turbos do you use? Does the power taper off past 6000rpm? It looks to me like you could ramp up a bit more post peak torque.

[renxun]

how do u guys actually put all the figure in excel file ? do u actually copy one by one of the figure and key it in ...

and from my observation its quite aggressive compared to mine ... but again the whether , humidity and the fuel are very big in difference... i dare not to comment much bout it...

[chris davey]

For MT people I just whack in the T-rpm and T-map figures and it is all done FOr this one, I just went through and picked the boost lines that are closest to my MT figures ie. 4.3psi instead of 4psi and whacked the figures in. Only takes 5 mins or so

I have about 5 or 6 different 1jz ignition maps now.

[240jz]

many thanks for the responses, sorry for the delay in reply, a dyno is here:


I'm running standard turbos, and the plot is before the fitting of the dump pipes., so should be making a bit more higher up the revs.

I'm running a haltech, so I just save the maps to file, and import into into a spread sheet - easy!

I'll send an email tomorrow chris, very interested!

I run optimax, but not usually with an octane booster, but will now use some NF stuff for track work after your advise.

Thanks again, much appreciated.

[chris davey]

Thanks.

You expect the torque to drop after peak torque obviously but I think if you can run a few more degrees up top without knock then you should be able to increase that torque a bit and therefore flatten out the hp line post 6000rpm.

The general torque curve of the 1jz has a lot to do with the stock cams as well as the small turbos though. Do you have stock cams? Do you have cam gears?

[240jz]

Thanks again for your help, am running stock cams and stock cam gears. Don't know how the curve would look with the new exhaust and decat, but worth knowing about trying to get some more timing in after peak torque.

[renxun]

how much booost u running wit that dyno figure? seems not bad though...

one ting i would like to ask also .... does all the dyno in australia equipped with retarder? so that the reading out put will minus the wind expected wind resistance on the road... ?

[chris davey]

Most common dyno in australia is dyno dynamics. There is a thread in the general area if you do a search about all the different modes etc. Typically, our dyno numbers are 15% lower than dynojets (what americans use). I don't know that UK one. I was just looking at the curve anyway not the actual numbers. Dynos are just tuning tools

It says flywheel hp on it but I can't see how it could figure that out. Unless it is an engine dyno obviously.

[240jz]

the dyno is a dynapack - a hub dyno, as it measures at the hubs, you don't get tyre losses so it'll read a bit higher than a dyno dynamics. The figures are at the hubs - not flywheel, the tcf value of 1 shows that there is no accounting for drive train losses. I think you can set that value if you want to estimate flywheel figures.

Did you get my email Chris? i'll PM you mine just in case.

[240jz]

thanks for the email Chris - great stuff

[1jzracing]

does look a little aggressive compared to what we have used, would be a good cold weather map!

in general its the lower reagons that look a little strong 38degrees at 0 boost would be wide open for an atmo engine and is a lot more than general

up on boost it looks ok, all relative to the fuel quality thou

[rokusan]

ignition map is pretty much the same as what i run?

with all due respect, i have had trouble with optimax, try another fuel..maybe