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Old 05-12-2006, 07:11 PM   #1
kingtut12
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RIP 02' 2.5WRX PSM

Default Considering switching back to UTEC

I had a UTEC and was told that I needed a Cobb AP with street-tuner. So, after a bit of thought and some selling - I ended up with an AP and street-tuner kit.

It seems to be a good setup except for the specific mods and brands Cobb says you can use and not use. What I was told :

You absolutley cannot use a BigMaf intake -
You should not use a Perrin inlet
You should use VF turbos
You should not use ANY electronic boost controller
You can use APS intake, but only the 65mm one and at your own risk with the possibility of a rough idle.

This is all fine, except that I have a BM intake, perrin inlet, EBC, and I cannot get my injectors scaled properly or my intake calibrated - nor can I get much customer service on making it work through Cobb. Until I sold the Big Maf, Cobb said they would not help me with a Base map. So anyways, I'm thinking on going back to the UTEC - which I always liked from the beginning anyway.

Just venting - any comments are appreciated.
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Old 05-12-2006, 10:06 PM   #2
2phless
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Use both. They do different things.
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Old 05-13-2006, 12:42 AM   #3
roybfr
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Have you tried installing the stock intake then tuning the injectors? I was advised to go this route, scale the injectors and get the latency and tip-in set, then install the intake and calibrate it. I was told if I installed the intake at the same time it would make it more difficult.

As for getting the intake calibrated there is a good write up on iwsti.com by nhluhr
http://www.iwsti.com/forums/showthre...ke+calibration
he goes about it different then Cobb suggests.

The things they say you can't use really apply more to the AP stock cobb maps. With just and AP you could get a custom tune from the right person with those mods. And with the ST every thing is pretty much fair game as long as you can figure out how to tune for it or find someone that can.
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Old 05-13-2006, 04:33 PM   #4
kingtut12
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Default

Quote:
Originally Posted by roybfr
Have you tried installing the stock intake then tuning the injectors? I was advised to go this route, scale the injectors and get the latency and tip-in set, then install the intake and calibrate it. I was told if I installed the intake at the same time it would make it more difficult.

As for getting the intake calibrated there is a good write up on iwsti.com by nhluhr
http://www.iwsti.com/forums/showthre...ke+calibration
he goes about it different then Cobb suggests.

The things they say you can't use really apply more to the AP stock cobb maps. With just and AP you could get a custom tune from the right person with those mods. And with the ST every thing is pretty much fair game as long as you can figure out how to tune for it or find someone that can.
Thanks for the input - I will have to hunt down a stock intake, but I like this idea. I have located a stock inlet as well as an APS intake 65mm. How much HP am I a really losing by going back to stock inlet? Will my FPgreen even fit the inlet (2.4")

Main mods are : EJ25, TXS FMIC, PE800, Green, Wal pump, up/down/headers, no intake for now (just sold BigMaf). 93 oct. platform - 2002 wrx
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Old 05-14-2006, 01:24 PM   #5
TypeC
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Quote:
Originally Posted by kingtut12
Will my FPgreen even fit the inlet (2.4")
Yes, that's the stock size. The 3" inlet requires a different hose or adapter.
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Old 05-14-2006, 03:04 PM   #6
kingtut12
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Quote:
Yes, that's the stock size. The 3" inlet requires a different hose or adapter.
Ok - great.

Quote:
As for getting the intake calibrated there is a good write up on iwsti.com by nhluhr
http://www.iwsti.com/forums/showthr...ake+calibration
he goes about it different then Cobb suggests

This info here is very good. I went through the same headache - logging and changing my MAF airflow, only to find that a different driving scenario wrecked the changes I made. I can see where this spreadsheet info would help with the guesswork.

Question: If you can manipulate any intake readings by using this formula - will it necessarily matter that my injectors are scaled perfectly? I mean, theoretically, I should be able to leave them at a stock setting and just change intake calibration settings and fueling - right?

I can see this thread no longer belongs in UTEC...thanks UTEC guys for helping me with my AP-ST. LOL!!
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Old 05-14-2006, 07:16 PM   #7
gpatmac
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Kingtut, have you played around with the ECUExplorer yet? My car's been down, so I've not spent too much time with it, but I'm very hopeful. There's a guy up in Indy who's already having significant luck with it on his STi. Apparently, the STi folks are way behind because of, I guess, overcoming the DBW and maybe AVCS issues/obstacles to tuning; but the bugeye folks are pretty much doing whatever they want.
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Old 05-15-2006, 04:20 PM   #8
kingtut12
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Quote:
Originally Posted by gpatmac
Kingtut, have you played around with the ECUExplorer yet? My car's been down, so I've not spent too much time with it, but I'm very hopeful. There's a guy up in Indy who's already having significant luck with it on his STi. Apparently, the STi folks are way behind because of, I guess, overcoming the DBW and maybe AVCS issues/obstacles to tuning; but the bugeye folks are pretty much doing whatever they want.
I have looked at it, and definitely am interested in it. PM me for more detail.
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Old 05-16-2006, 10:18 AM   #9
xolosis
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Default

In regards to tools like EcuExplorer/EcuEdit/EcuFlash I've just recently downloaded my DBW ROM image and am getting the XML definitions sorted by a programmer. Thay are all handy tools...

For example you could download (EcuFlash) and edit (EcuEdit) you rECU ROM with a slighty conservative tune then flash it (EcuFlash) back like a 'Base Map'. Then use UTEC for say 'Realtime Tuning' over the top. Also its much easier to scale larger injectors, big maf etc from within the ECU ROM Image than with UTEC. Many know how painful it can be as you need to log Fuel Trims with an ODBII tool (EcuExplorer) etc. Again just an example!

These tools go very well together if you know how to get the most out of them.
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Old 05-16-2006, 10:37 AM   #10
kingtut12
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OK- thank you for the insight.
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