SARX7

I had My car dyno tuned on the 8th @ Rotary Performance and I've finally been able to transcribe the maps.

I started off with a slightly tweaked version of Chuck's new maps, basicaly using his ignition maps and messing with the fuel maps to get it to run less rich.

Chris @ RP tuned the car and found that I was having ignition problems straight off so the first run right in the door was 246RWHP. He swapped the plugs and wires and the very next run was 261RWHP. Then he looked at my maps and tweaked them changing the timing maps and the fuel map and the final pull was 271RWHP (264 SAE).

I found a few spots of negative split and fixed them.

I do have a question though, namely the accelerator timing.
I've changed mine greatly from what's shown in these maps because when cruising at near 3000 RPM's and I punch the throttle the A/F goes full lean and then jumps back to rich. So at 3000 I've set the enrichment to 14ms which seems a bit excessive to me. Any sugestions?


Also the map is very rich at cruise, I'm going to take a friend up on an offer and put it on a dyno with a wideband O2 to get the cruise area down to an acceptable level. it won't even goe closed loop right now.

cewrx7r1

iTrader: (2)

From your listed power, it looks as if your engine is almost stock. Which of my maps did you start off with? From what I see in your timing maps, RP did you a great injustice!

Yout timing between N11 and N15 for P17 to P20 are fine for a stock engine. But you have too much advance below N11, and not enough above N15. Even for a large port engine, by N20, you should be about 2 to 4 degrees higher than at N15. This is causing you a great loss of power above 5000 rpm!

Look at the attached base stock map.

SARX7

The mods are listed on the spreadsheet, and the motor has a fairly healthy street port going on.
I started off with the map just prior to your ingintion tuning.

Chris was explaining the changes he made, and said that the base PFC timming maps are set too aggressively on the timing side, and that after the first few runs with your timing maps he could imporve the curve by moding the timing maps.

I'll try to get my dyno sheets scanned and posted, but he pointed out a few areas where he could improve the curve by changing the timing maps. The first few runs on my original maps were quite different from my final map. There was a very large transition spike and now that area is a little more flat.

He also mentioned something about my exhaust having a very raspy note, and I have to admit that the raspyness is gone now and it has a deeper note.

I should have prefaced my post with : I asked Chris to tune it with reliability in mind not max power.

Now with that said I do have limited access possibly to a dyno here in town to do some refinement on this map, but unfortunately I probably don't know anywhere near enough to tune the timing properly. So with some coaching I could learn.

What kind of power loss do you think I'm seeing. If I can make changes to this map I'm all for it, but I probably won't be making any serious changes untill after my wedding.

Any input is greatly apreciated and I'm all ears. Do you belive the advance in the timing is the cause for the acceleration enrichment problem?

What kind of power should I be looking for? I went in without speaking to anyone with the figure of 260RWHP in mind for my mods, should I be considerably higher?

What do you mean exactly by a great injustice, you think the timing maps are too tame and I'm loosing a considerable ammount of HP?
Like I said I'm open to suggestions. I figured I would have them tune the car as a baseline and then finetune it myself later, so if I need to bump my finetuning schedual up then I can do that.

cewrx7r1

iTrader: (2)

My comments about the low and high end timing still aplies. Look at Houston map set two, it has more retard in the middle rpms than yours and more advance in the high end. He runs a 50HP shot of nitrous with street porting, otherwize he would need more advance everywhere.

OK, I found your mods hidden at the bottom of the first sheet on basic PFC data. What was you boost at the high end? My first dyno non tuning session last summer with a cat, small IC and stock injectors gave 280 SAE(corrected) hp at 12PSI.

Your 264 is bad unless it was at about 9PSI which is lower than your #1 boost setting is for. Most people use close to 12PSI as a base point for comparing HP per mods.

Get your fuel AFR adjusted first, then go back to the dyno and work on the timimg. Your power should be over 320 RWHP SAE at 12psi.

Don't let us down!!!

SARX7

Ok so timing on the low end is too advanced and timing up top is not advanced enough.

My boost was set to run 10PSI, but it was a cold day so it was probably more like 12, I've upped the settings a bit and am runing 12PSI all the time now. setting 2 seems to run 13-14 PSI, on a cold day this setting would hit 1 BAR easily.

When I go to do the A/F fine tunning tuning, I'll mess with the ignition and see if I can get any more HP out of it. Unfortunately the dyno only reads up to 300 HP so I'll have some limitations on what I can do, but it is free.

Even with my mods:
DP, MP, Cat-back, Pulleys, and Ported Motor, ALL intake side is stock, I should be hitting 320 HP, or is 280 a more resonable estimate? I figured I wouldn't top 300 untill I got an Intake and Intercooler.
What should I be shooting for at my next dyno session?

ech

Ahah!, I just started another thread about your maps chuck (cewrx7r1).

I have a copy of your maps called pfcchuck02.xls - what do you think their compatablity would be for my car, with stock motor, '99 turbos (basicaly stock) y-pipe, PFS IC/Air, high-flow cats (yes 2 of 'um), and RB catback. ??

thanks,
-Erik

evot23

iTrader: (17)

Chuck,

Can I get a copy of your maps?

the_glass_man

iTrader: (2)

The numbers seem low, I made 305 rwhp @ 10 psi. with about the same mods.
Stock motor 24,000 miles.
PFC
Greddy Pulley Kit
ASP Race IC
ASP Exhaust (dp, mp in one) with Borla XR-1 Muffler
ATR DP
FTL Intake
Crane Fireball
1300 secondaries
Denso Fuel Pump

I had mine tuned @ KDR and in various stages (temp levels, timing, a/f ratio, etc)
It made 276-305 corrected hp.

SleepR1

I'm confused, with a ported motor, you have to retard the timing?

I'll have a ported motor from KD Rotary, intake, IC, dp, hiflo cat, catback, underdrive pulley, Japan spec twins with boost set to 10.5 psi...Will the A'pexi Power FC base maps work with those mods?