I know this comes up all the time, but it's always good to see if you're going wrong somewhere.

I've tuned my UK Spec Evo 8 with the following parts:

10.5 Ex Housing
Evo 8 MR Cams
255 Fuel Pump
Sports Cat
3" Downpipe
Powertec Cone Air Filter
HKS Super Drager Exhaust (Standard on the UK FQ Car)
Apexi AVCR set to hold 1.5 bar to the redline
I always use 98/99RON UK Fuel

I've had a few problems with idle since putting the cams on, it doens't seem to hold a steady 14.7, seems to cary around it quite a lot as seen in the log.

The car seems to pull nicely on a 3rd gear run, but once into 4th,5th and 6th it seems to struggle to pull above 4.5k RPM, it not that it's slow, just that it doesn't seem to have the pull.

I can't seem to add much timing to the standard map and in some places I needed to take timing out to stop it knocking. The log i've got show some knock in one of the pulls, this is not always there and is the worst I've seen so I've left it for now.

Anyone got any comments on what I have got and any suggestions on improvement. I was wondering if peaking to slightly more boost and tapering off near the redline would help at all?

Cheers

Keith

LOG ATTACHED BUT ZIPPED ----vvvvvv-----

 

Some things that I have noticed, in constrast to my maps...

First off, your timing from 1000 to 3500 can be improved quite a bit. In those areas, starting at 1000, I am running 6* starting at 1,000 to 1* at 3,500 rpm, in my 280-300 load columns. (But, I am also hitting loads of 280-305's. If you posted a log, we could tell much better. You can most likely can up your timing in those areas a lot. (However, don't do it all at once, and your high load colum (In a log) is probably different than mine)

What AFR's are you running throughout a pull?

Your timing at 7,000 rpm's seems like you can up it to around 15*.

Try posting a log, as we will be able to give you a ton more information if we are able to view a log file..

 

Thanks for the comments.

There is a log, attached but I had to zip it down.

Cheers

Keith

 

need AFR's and your timing at the highest loads starting at 2500 rpms shouldnt be in the negative area

 

The log attached has all the info in, but here is a snippet of a run that has slight knock:

Cheers

Keith

 

Richen the mix just a little at 240/5000 and drop the timing at 240/5000 and 5500 to get rid of that knock on the high end. If this is a 3rd gear pull, that knock will definitely be there in 4th. You are running pretty lean across the board as well and that's probably why you can't add any timing w/o knock.

 

as much as I like lean tuned cars, one has to always be suspect of their wideband.

as has been observed by individuals and testers, readings can vary from manufacture to manufacture and from new to old.

what I am trying to say, try richening up a half point everywhere and see if that helps with your timing efforts.
perhaps you are reading a half point richer than you are

other than that, you are sure of your cam timing, clean filter and that sort of mechanical. no rubbing exhaust or such?

 

You could be right about the Wideband, even at idle it seems to read just rich of 14.7 and it's got a brand new narrow band in there.

Maybe I'll do a calibration on the wideband and see what happens then.

Cam timing is possibly a issue and I suffer with real poor idle. The cams are Piper copies of the OEM MR cams. I've got verniers on them and timed them up with a degree wheel as best I could. Pretty much on the standard marks though.
No boost leaks, new MAF, new Narrow Band o2, new filter, throttle body nice and clean.

Downpipe is very close to cross member stays underneath the car so could be banging, but I've never heard it.

I'll have a quick run at 0.5 richer accross the board as you say and see what happens.

Cheers

 

Looking at his speed vs. rpm (and assuming the speed column is accurate) I'm pretty sure that's not a 3rd gear run. I'm going to guess it's a second gear run but even so something is not right. For example from ~7000-7250 his speed shows ~47 mph which closer to first gear (but just a bit too fast). I realize that logged speed isn't all that accurate but it doesn't even seem close as the end of a 2nd gear run should be around 60mph.

 

I'd ignore the speed, it's a UK car so has a speed converter. The calcs in evoscan are wrong for this. It's being fixed in V1 apparently. I think that run was 3rd gear run.

 

6 speed right?

What boost about 23?

I would default timing to stock (fq300), but rescale the load to your equivalent lean a little more then adjust timing. Thats what I would do

Was the pull uphill? 4000 - 6000 time was 2.3 sec for 3rd which is a little below what I would guess your car should run with 6speed

 

It is a 6 speed yes and the run was uphill, I like to load the engine during the run and my normal work route is all hills.

Boost is about 1.5 bar so about 22psi

I'm not quite sure what you mean by "rescale the load to your equivalent "

What do you suggest leaning more? the AFR's seem about as lean as I'd want to go really as they are around 11.5

cheers

 

I was misled since the log was uphil - thought you were under power for the fq.

Your goal is to wake up the higher gears, and 3rd seems good right? It is way too difficult for me to look at those .cvs logs and decipher what is going on (been pampered with logworks), but my guess would be to campare the AFR. But this is from someone who runs 12 - 12.5 AFR constantly with easy timing.

 

Ah, okay. I was just confused since they didn't match.

 

I would suspect after looking at the fuel map that its actually lean not rich. Unless you have the lean spool disabled, with a pump your fuel map will typically be in the 10.8 range or less at redline (and I have seen it with the lean spool disabled at 10.8 with a 255). As far as the idle, they bounce quite alot while in closed loop anyway I wouldnt be overly worried about that. There are some alternatives you could investigate as far as the idle, but I would start with the wideband as you already indicated you were.

JB