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Old 07-02-2000, 07:57 AM   #1
alastair
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Post low end power loss... solutions: (tec2 ?)

i have ran a scoobysport (with cat-back) for several months: i got the little benefit this offered in the mid to high range, with no loss of low end power. i just went with a good quality intake and the mid to high end gains were substantial. however, my buttdyno tells me that i have lost in the low end. it feels as if the throttle is not as responsive at low speeds/rpms. (auto MY2000). before the intake the car would surge foward from a stop or slow start. now i get the familiar exhaust tone without the initial surge in power. i am enjoying the new found power that i have at higher rpm's but i thought one of my car's strengths was this low end grunt; so i want it back. what do you guys think is the best way to reaquire it? a lightened UD pulley is supposed to enhance accelleration so is this a viable solution? or is fuel managment the best and most comprehensive option?
of the electronic options Shiv's seems the most versatile. so (shiv or anyone with TEC2 experience) is the TEC2 going to get the most out of these mods?
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Old 07-02-2000, 11:59 AM   #2
M8
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good question. i have an exhaust and will be doing the intake thing after tires. anyone?
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Old 07-02-2000, 05:58 PM   #3
M8
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so, if i understand this correctly the tec2 may be overkill for those of us that want to stay NA? simply based on cost effectiveness.
not that it won't improve things but as you say, Shiv, the total amount of money could be spent on forced induction and make alastair's problem obsolete. so what then is the most cost effective solution to the low end loss problem? i don't mean in theory; i mean what item(s) will definatly alleviate this problem?
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Old 07-02-2000, 06:01 PM   #4
shiv
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A 50 shot of nitrous sure would help

shiv
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Old 07-02-2000, 06:39 PM   #5
M8
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Cool

well that clears everything up then!
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Old 07-03-2000, 12:08 AM   #6
8Complex

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Post

Quite a bit of throttle response on the low end is from the plenum box on the throttle body. It is a reserve of air that doesn't have to lower in pressure as quickly as an intake that is tube-based would.

Generally when you install an intake you lose low-end and gain mucho high end because of the design of that plenum box. It is good for low-end and bad for high-end (bad flow, but good as a resivour).

The UD Pulley would free up a few hp and give you a little better throttle-response, but I'm not sure about whether it'd give you high or low end more (I'm thinking low end, though).
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Old 07-03-2000, 12:11 AM   #7
shiv
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A good engine management system, the more versatile the better, will get the most out of any mods as long as it is tuned correctly. One could conceivably get a noticeable bump in low end torque by running 92 octane and revised (more agressive) ignition timing down low. Typically, the low end is the first thing that improves with EFI tuning. Down low, a few more degrees of advance can go a long way. Adding timing with the ITC may not be as effective as the stock knock sensor will yank it back out, forcing you to play around with microphone isolation.

But make no mistake, while prog. engine management is probably the cleanest and most effective solution, it's also the most expensive by quite a large margin. For NA, some could argue that it's not cost effective. Afterall, for $2000-2500, you're NOT going to get close to turbo or SC in terms of performance. But it can make the car run better, safer, optimizing what you have, while setting you up quite nicely for future mods (cams, forced induction, nos, etc,.) Just make sure you don't eventually look back to see that you've spent $1500 on add-ons and piggy backs. That money could have been better spent. That's my take on it at least. Good luck,

shv

[This message has been edited by shiv (edited July 02, 2000).]

[This message has been edited by shiv (edited July 02, 2000).]
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Old 07-03-2000, 12:19 AM   #8
alastair
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Shiv,good point, about cost effectiveness; thanks.
8Complex, yeah that's more or less where i would expect to notice a UD pulley; in the low end. maybe thats the thing to try first. thanks.
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Old 07-03-2000, 10:49 AM   #9
josh
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I just put my big black box back on, and noticed my low end power came back. The top end is still there, but not quite as strong. I just took my Weapon r, cut off the big bend, and re-attached it to the big black box. The filter sits right next to the fender now, and I plan on rauuning cold air to it, or putting the filter back into the fender(had it there before). So far the car is MUCH smoother, from idle to WOT.

josh

 
 

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