I Like This Club

[tquarrell]

Technically I'm not a member, but thought I'd post here anyway (can I do that?).

Yesterday I had a set of headsex's injector's fitted and the car and tuned in Melbourne. The aim was to get 300rwkw's. I'm over the moon with the result but at the same time slightly disapointed. The mods are as follows:

wogcooler

headsex's injectors (mototrons apparently, ie deka copies but whatever)

F6 intake

.75mm gapped stock spark plugs

BMC filter

Walbro GSS341 fuel pump

I still have a totally stock exhaust (the car's a ba auto sedan btw)

first the car pulled 203rwkw's with stock tune, injectors, pump.

Then we had trouble with the injector scaling due to the injectors being slightly different (the car had 15.8 to 1 afr in the mid range, never below 14.7 which worried me) however the car never pinged which gave me a bit of confidence, but I wasn't happy with the afr's and gave 236rwkw. Turns out the pump wasn't good enough (I modified the relief valve) but it maxed out at 270rwkw with lean afrs. The pump's done 70km's and had a dirty filter that wouldn't have helped it. So next came the new pump. It was 4pm and I needed to be at the boat by 6:30 so I wasn't expecting to achive my target. With the pump and adjusting the injector sclaing, the results were as follows with afr's around .83 lambada (satisfactory, especially since it isn't pinging at 1.1 lambada on crapy Tassie fuels lol).

261rwkw 8psi

283rwkw 10psi

299.5rwkw 14psi

so close, but no cigar. I figure the exhaust would let alot more power out (even just a cat would help) with less boost but I decided against changing the exhaust to a)keep it legal, b)costs down and c)show some mercy to the bits that need to send it to the wheels.

Now for the excuses. The car pulled 299.5rwkw's without the fans on the intercooler, and backed it up immediately after with 299.4rwkw (that cooler must be working well, certainly at this power anyway). The next excuse is that the dyno had just been repaired and was reading a little low. Anyway, the bottom line is I got 50% more power with these mods and I'm stoked. Total all up cost including fitting injectors, tuning, transcooler and whatever was under $2500. This is the first car I've spent money on making it faster, but the minute you step on the throttle I can certainly tell and feel where it went. The first time the tuner took me for a spin with the "small" tune, I felt myself being pushed back int the seat like I had never imagined (seriously). I can only imagine what 400 or 500 rwkw's must be like, I thought 100kws at the wheels made a big difference, 300 must be unreal.

[XR06T]

congrats, sounds like a good result in the end!!

[Dagabond]

(can I do that?).

←

No you cant.

[Fat-Tony]

You should be more than happy with that setup. Car I just purchased Runs Nizpro edit, injectors, F6 intercooler, and walbro intank and according the the dyno sheet I have makes 275rwkw through the stock auto. Your mid range of 14.7-15.1 if at WOT seems a lil lean for my liking as my car sits on about 0.83 lambda from 2500rpm to redline. But your making great power and you should be having lots of fun with it. Congrats

[mbjunior99]

Nice work mate, enjoy the new power

[Buf-Phoon]

Got any Dyno charts with AFRs/ Boost for the final tunes ??

[tquarrell]

I haven't got afr's or boost dyno charts yet, these parts of the dyno was not working, afr's were being watched on a digital read out. Final tune starts at 1 lambada, then works it way done to .83/.84 pretty quick and holds it to readline, but wouldn't mind getting a trace on a chart to see it a bit more accurately. THe tuners done heaps of these things (he had done a car similar to mine, he used that tune and just adusted the fueling and timing in the top end til he was happy).

Here's a power graph, sh*t quality pic but you get and idea of the shape. It's got about 245rwkw at 100km/h(140rwkw stock), and 299.4 at 145km/h (203rwkw stock, dyno done in third gear obviously), then it starts losing power (I put my hand up once power started decreasing, no point reving it any further). Tuner put some more timing in the top end but suspect the stock cat is making it hard work in the top end.

Can anyone confirm how to convert km/h to rpm? I did a calc based on the car doing 203km/h @ 6000 rpm in third (that's what the mk1 manual does in 4th, same 1:1 ratio as auto in third per wheels magazine), is that speed/rpm not useful on a dyno? Anyway according to my calcs;

100/203 * 6000 = 2956rpm @ 100km/h (245rwkw)

145/203 * 6000 = 4286rpm @ 145km/h (299rwkw)

either the tires were slipping on the dyno, my adjustment factor is wrong or the car produces a sh*t load of power low down.

[tquarrell]

to help make sense of it, thought I'd mention 50kw increments on the y axis, 20km/h increments on the x axis, did over 185km/h with stock tune (I think he did 5800rpm, busy watching afr's), stopped at 170km/h on final tune

[loopism]

Can't read a thing on the graph ...

[tquarrell]

Yeah, I know, my hand obviously isn't as steady as I thought. Just figured out my printer's also a scanner (that could be useful in future lol). Anyway here's the scan.

BTW driving at 100km/h in third confirms my calcs.