Not the best day in terms of heat to look at this but......

Essay time:

After the PE EcuTek Open Day my car was set to a boost target of 17PSi and held a bit longer than the standard TEK2, all other parts changed as necessary. After just being done went out with Steve and Delta DAsh recorded boost as around 16.4Psi. Got home that night, went out again and waaahhooooo - car was flying, boost was more and the gauge was reading about 1.2 kg/cm (around 17Psi) held in 5th (going by delta dash the gauge is fairly accurate).

Fitted a K&N 57i induction kit last week and wanted to check all was ok after fitting so we did a run at lunchtime (v. hot lol - well for Blighty anyway )

All seems to have checked out ok bar a few things. Had driven through town, plugged in Delta Dash and did a run. Boost was only 14.5 ish Psi - a 2Psi drop on a hot day seems alot to me. So to compare we took out J's car. He started it up (had been sat on the drive) went out in his and he was getting 16ish, dropping into the 15's. The difference between J's and mine being the slightly higher boost target on mine and the 57i otherwise both are decat.

Surely I should have got the same boost if not more so I wonder if something is amiss.....

After fitting the K&N it felt like I had slightly more boost and the gauge readings slightly increased and it pulled like a raging bull through the revs...... Going by these readings though there is something amiss....

I have fitted the induction but the resonator is still in place - could it be that its drawing in too much hot air and thus the low boost? Should I get the resonator out of the way? What about those little scoops for the louvres on the bonnet to feed cold air to the filter?

Also, compared to J's mine was showing less air flow but with the induction surely it should be higher? On spool up my O2 sensor is showing very low readings compared to J's but the same a few hundred rpm later......

I'll post the raw info below and will be gratefull of any comments.
(Apologies for the quality )

Mine in 3rd from 1.5k revs to the redline:



Mine through 3rd, 4th and 5th changing at 4.5k rpm:



J's (top) vs mine:



More J's (top) vs mine:



Thats about it then - any comments please?

 

[sweeping statement]Ram Air Pods usually make the car run leaner, and often, they make the MAF underead the airflow as well which leads to less fuel = even more lean. This is usually worse at the bottom end than at the top....[/sweeping statement]

See also this thread.

Matt

 

Aye, but with the richened TEK I wouldn't expect the problem with a 57i???, and all the graphs look ok - not like that huge lean spot in the APS thread......... ????????????

 

2 PSI is not an unsurprising drop I see it all the time - getting only 17 today in lower gears with the car just warmed up and then a mile down the road, 20 in 4th. To be brutally honest, I have ended up setting a new duty cycle and then live with it for a few days and drive it in different conditions. The only way to be happy and avoid fluctuations is to have it so it just reaches or breaches by up to 0.5 PSI your target in the most favourable conditions for high boost, and live with lower boost the rest of the time it seems.

 

Stop playing with boost / computers and drive the bloody thing!



MB

ps mine felt better after taking the K&N off.

Mb

 

Ok, so it would seem to be normal then I've gotta live with less on the hot days But otherwise that all looks ok then?

I imagine it would be better the more cold (well colder than the engine bay) air I can route to the induction kit.........

A dual carriageway blast on my way back to work showed 5th as 1.15(16.3Psi which I suppose isn't too bad) so perhaps earlier was suffering from heat soak.....

The bit that baffled me the most was in the spool up J's 02 sensor is:

RPM/O2

1936/0.775
2005/0.785
2104/0.81
2207/0.855
2313/0.87
2444/0.885
2595/0.895
2723/0.915
2913/0.92

Against mine at:

1916/0.69
2055/0.015
2199/0.035
2362/0.03
2500/0.055
2670/0.715
2844/0.88
3019/0.89

How come there is such a difference between the two, whats this showing?

DBM - lol yeah @ driving it!! To be honest mine felt soooo much better after putting the K&N on, having spoken to Steve Done at the open day and him and Merv saying the map was really done with induction in mind I decided to go for it. After fitting 5th was holding 17Psi(1.2 kg/cm) with a peak of 1.3max where before it was between 1.15 and 1.2 and peak of 1.25.

 

The absolute values for the lambda are not so crucial - a value of 0.0xx is not massively leaner than 0.7xx because of the response curve of the sensor - it is just getting nearer to stoich. Your car is leaner during spool up assuming all the lambda sensors are working well. Your airflow may underread slightly. You will however be sucking hot air in from the engine bay. I went back to the OEM setup ages ago and have not looked back. Sorry if you have wasted your cash on a lampshade.

 

lol - nah got it for a good price (cheers Plantie!!)

I suppose the only real way to tell is whack the old airbox back on and do another run on a similarly hot day!! Ah well!!!

 

My pleasure fella

 

Is there a lambda voltage to CO% list anywhere? There's the one from the Link manual, but it's a tad vague. Which is probably right... 0.4-0.6V is stoich, .84 13:1, .86 12:1, .88 11:1. But what do the very low figures mean? Presumably very little as there's not enough CO to measure? (anything under 0.6 is less than 1% anyway). So actually 0%-0.6% is stoich, actually.

 

Plantie you lurker Soz didn't reply to your message but wasn't in - was out for the weekend but my phone was in !!

[Edited by ScoobyJawa - 7/15/2002 5:30:07 PM]