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Old 09-17-2002, 09:56 PM   #1
DSMcG
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Default UTEC roadrace / partial throttle feel?

Have any of the initial UTEC testers had the opportunity to use this system in a low traction, partial throttle scenario. IE: fast sweeper on auto cross course - road course - mountain road...any situation that would require relying on that fine line of throttle control. Not a WOT run down the strip.

My concern is this: would there not be situations requiring a delicate throttle while at high speed - flirting with the transition between closed loop (OE control) and open loop ( UTEC control ). Is the transition a smooth one? Will this be an issue? 55 - 60% TP (Aprox threshold between closed and open loop ) is a fair amount of throttle - I'd hate for the power delivery to change too drasticly at a such a time. Will we have to compromise the tune to "blend" the transition for just such a senario?

- A roadracer at heart - DSMcG
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Old 09-17-2002, 11:06 PM   #2
davidm_sh
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Default

VERY GOOD QUESTION.

I experienced that VERY thing with my Cobb (tps tuned) unichip. Along wide sweeper roads... err race tracks . The car became VERY jerky with boost holding constant leads me to believe that it was the transistion area around the TPS and the timing was being jerked around quite heavily. Could be a overly lean/rich situation as well brought on by this transitional area.

Two things about the UTEC though that will make it less susceptable to this (IMHO as I haven't tested yet just read about it). You can control the TPS % where the ECU does it's own thing and you take over. And they are working on a complete MAP based system which would also address this down the road.
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Old 09-18-2002, 12:13 AM   #3
Wombat North
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UTEC/ECUtek/WI & SD tune

Default

As I don't know your setup I will explain my different ones.

I have raced on road course with Turboxs stage 2 with uppipe with an EBC which works way better IMHO than ABC that comes with stage 2. Feathering the throttle on the limit was not a problem. I also want to point out that you can only run 14psi maximum lap after lap as the stock turbo blows hot air which had my EGT's upto 1650f down the straightaways.

I now have stage 4 with vf34 and the car drives better than stock. With EBC I don't get part throttle boost high egt problems and during racing at 17 psi my egt's are 1550f. The feathering of the throttle is a non issue.
FWIW
I'm pretty sure the UTEC is going to be great.
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Old 09-18-2002, 05:04 PM   #4
DSMcG
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Thumbs up Thank you for reply

Thank you for the info,

My components (for the engine) thus far: VF30, Sti injectors, Walbro pump, PDE up-pipe, TXS turbo back w/ stromung twin tip, Samco hoses, Upgraded top mount, Vishnu pulley, colder plugs, K&N panel filter...ALL waiting, under my bench, for Eng. manag. (I'm on the fence about an AEM intake)
- Auto X, Track days, Mountain roads...that's what I own the car for. I do not want the power delivery to be "on and off the pipe" if you get my drift.
- and I do drive the car to commute every now and then.

Thank you again in advance - DSMcG Beta testers please comment!
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Old 09-21-2002, 03:48 PM   #5
DSMcG
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Old 09-21-2002, 04:21 PM   #6
SGOSWRX
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Default Re: Thank you for reply

Quote:
Originally posted by DSMcG
Thank you for the info,

My components (for the engine) thus far: VF30, Sti injectors, Walbro pump, PDE up-pipe, TXS turbo back w/ stromung twin tip, Samco hoses, Upgraded top mount, Vishnu pulley, colder plugs, K&N panel filter...ALL waiting, under my bench, for Eng. manag. (I'm on the fence about an AEM intake)
- Auto X, Track days, Mountain roads...that's what I own the car for. I do not want the power delivery to be "on and off the pipe" if you get my drift.
- and I do drive the car to commute every now and then.

Thank you again in advance - DSMcG Beta testers please comment!
I have Turboxs stage 4 with upgraded TMIC and race pipe. The AEM intake made my car run slower. I thought it felt slower in the seat of the pants after the installation. Then when I went to the track my thoughts were confirmed. I ran slower on average than I had run on several preceeding weekends.

So I took the AEM intake off my car and I could definately feel the increased pull in 2nd gear that I didn't have with the intake.

After a couple weeks running the stock airbox restrictor mod with K&N filter I decided to install the AEM again (don't ask me why). Same exact results. The car had increased hesitation especially in 2nd gear. Over all performance was down. I switched back to the stock setup with restrictor mod and K&N filter and the car again pulls hard.

I guess my stage 4 program doesn' t like the AEM intake.

My advise would be to save that $200 on something else.
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Old 09-23-2002, 01:41 AM   #7
DSMcG
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Thumbs up Thanks for the reply

Thankyou,
Was there any fueling compensation for the intake after the stage 4 install? - This may be the key to the UTEC, dial in the proper A/F -walla, you're new found additional air is working for you, not against.

I'm still very interested in observations of the UTEC's ability to function well outside the drag strip invironment. How well does it handle the closed to open loop transition during aggressive "twisty" conditions?

Thanks - DSMcG
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Old 09-23-2002, 11:55 AM   #8
Carlo
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Default Re: Thanks for the reply

Quote:
Originally posted by DSMcG
Thankyou,
Was there any fueling compensation for the intake after the stage 4 install? - This may be the key to the UTEC, dial in the proper A/F -walla, you're new found additional air is working for you, not against.

I'm still very interested in observations of the UTEC's ability to function well outside the drag strip invironment. How well does it handle the closed to open loop transition during aggressive "twisty" conditions?

Thanks - DSMcG
Very well

Carlo
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Old 09-23-2002, 01:16 PM   #9
kenchan
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Default thanx abou aem

sgoswrx- thanx for reconfirming that the aem did no improvement over the factory hacked airbox. i was about to place an order for the aem this week..but forget it. hehehe.

is anyone having problems with the K&N drop-in filter's oil getting pulled into their turbo's?
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Old 09-23-2002, 02:25 PM   #10
n2xlr8n
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It lives! ; )

Talking Oil in Compressor

IMHO, your concern would be better placed on the K&N oil getting on the MAF....from what I've seen of the factory turbos (low mileage, even) they EAT oil. For example, my car had 11,000 easy miles on it, and the compressor discharge side was covered in oil film. Oil catch to be installed soon...
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