flat spot... with vcds log..experience please..

[Tucker157]

hi guys n gals,

i have recently noticed a 'flat' spot as the car pulls past 5k rpm. i done some logging tonight, and can see an obvious flucuation of the maf readings and injector readings... looking at this log its a little down on maf readings compared to a while ago.. but its done 137k mileage so im not too bothered by that..
i can run more logs if required.

if anyone could help with any suggestions as to what is causing these changes in numbers it would be most helpful... just say if you'd like anymore data.

logs done in 3rd as i struggle for a long enough piece of private road for anything more...

	Group A:	'002				Group B:	'115			
		RPM	Load	Inj. On Time	Mass Flow		RPM	Load	Absolute Pres.	Absolute Pres.
	TIME					TIME				
Marker	STAMP	 /min	 %	 ms	 g/s	STAMP	 /min	 %	 mbar	 mbar
1	188.12	1720	91.7	9.02	31.53	188.42	1800	94.7	1700	1290
	188.72	1840	97	9.84	35.83	189.02	1920	100.8	1770	1390
	189.32	2000	105.3	10.25	42.42	189.63	2040	109.8	1850	1480
	189.92	2160	112.8	10.66	48.44	190.22	2240	116.5	1940	1580
	190.52	2320	120.3	11.89	54.5	190.82	2400	125.6	2010	1700
	191.11	2520	131.6	12.71	66.69	191.44	2600	137.6	2090	1850
	191.82	2760	145.9	15.99	80.75	192.12	2840	157.1	2160	2090
	192.44	2960	170.7	19.27	100.06	192.73	3120	179.7	2220	2350
	193.02	3240	184.2	21.32	113.53	193.33	3320	186.5	2280	2430
	193.62	3480	185	22.14	121.78	193.93	3600	181.2	2310	2410
	194.21	3720	179.7	22.14	126.64	194.52	3840	176.7	2300	2340
	194.82	3960	175.2	22.14	131.36	195.14	4040	172.9	2250	2260
	195.43	4160	171.4	22.14	137.31	195.73	4240	169.9	2190	2200
	196.03	4360	167.7	22.14	140.89	196.33	4480	164.7	2140	2120
	196.63	4560	162.4	21.73	139.31	196.93	4640	160.2	2080	2040
	197.23	4760	157.9	21.32	143.17	197.52	4840	157.9	2010	1990
	197.83	4920	157.1	21.32	147.64	198.13	4960	154.9	1950	1970
	198.42	5080	154.9	22.96	150.42	198.73	5120	153.4	1930	1930
	199.02	5160	150.4	27.06	150.31	199.33	5240	150.4	1890	1900
	199.63	5280	147.4	26.65	149.56	199.92	5360	146.6	1860	1870
	200.22	5440	144.4	27.06	151.78	200.52	5480	143.6	1840	1860
	200.82	5520	142.1	26.65	149.19	201.12	5560	139.8	1810	1820
	201.42	5640	139.8	26.65	152.11	201.72	5680	139.1	1780	1810
	202.02	5720	136.8	26.24	151.22	202.32	5760	137.6	1770	1780
	202.62	5840	135.3	26.24	151.86	202.92	5880	135.3	1740	1750
	203.22	5920	134.6	26.24	153.47	203.52	5960	133.8	1720	1750
	203.82	6000	133.1	26.24	152.11	204.12	6040	130.1	1300	1750

thanks

 

[ibizacupra]

your injectors are beyond max'd out on that log...

stick your rpms and injector ms into there to see>> http://www.stealth316.com/2-calc-idc.htm

I predict lean as fcuk after then.... Your 5160rpm has 27ms which is 116% injector duty cycle...
Wideband afr on there to confirm and I would be checking fuel pressure follows boost and not sagging like a lot of ibiza's do at this age.

 

[Tucker157]

your injectors are beyond max'd out on that log...

stick your rpms and injector ms into there to see>> http://www.stealth316.com/2-calc-idc.htm

I predict lean as fcuk after then.... Your 5160rpm has 27ms which is 116% injector duty cycle...
Wideband afr on there to confirm and I would be checking fuel pressure follows boost and not sagging like a lot of ibiza's do at this age.

Thanks bill, I'd pay you to fix it, but your far far away! If you help sort it ive no queries sending some beer tokens your way!

Max'd out? It's a k03 on a stg1 revo map,running a 4 bar regulator. Should the injectors not be sufficient?

I guess the only consolation is it rarely sees 5k rpm as the wee biscuit sized k03 stops pulling as hard and I tend to short shift back in to the boost curve..

I recently changed the pump for a 4 bar s3 item. As the old std unit was very noisy and took close to 2 seconds to prime on ign on. I'll try get hold of the equipment to test the mentioned things...

If fuel pressure is ok, but its dipping lean what could be the cause?


Sent from my iPad Mini using Tapatalk HD