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Old 04-18-2001, 09:17 AM   #1
Scoober01
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Post More fule..I just can't do it captain..she maxed out..

Alright I though I wasn't going to need to mess with the fuel system till I got a turbo but burninrubber mentioned I may be running lean on the top-end. Now I don't get a chance to get my scooby up over 100 very often, but yesterday the highway was wide open and so was my throttle.
I got up to 100mph in 4th and it just kinda hung there around 4500rpm. I shifted to 5th and it started to pull a little bit more up to about 110mph again around 4500rpm. So I'm way lean in 4th and 5th.

So here are my Q's:
Why only in 4th and 5th; different fuel map?
What suggestions would you guys have for me?
upgrade pump...
jack up PSI on stock pump...
RRFPR...
Should I get new injectors?
What's the stock fuel psi?
How high can I take the stock pump?
What cc's are the stock injectors?
Will a Torque chip II help me.
Any other information about the MY01 fuel system you guys can give me would help out alot.
Thanx guys and gals.
Ryan D.



[This message has been edited by Scoober01 (edited April 18, 2001).]
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Old 04-18-2001, 09:20 AM   #2
Scoober01
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Post

O by the way I have:
GanzFlow CAI.
K&N high flow filter.
Borla GenIII headers.
Borla mid-pipe and exhaust.
Thaxs again all.
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Old 04-18-2001, 09:29 AM   #3
bratmantlz
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Question

uhh so you cant get over 110mph? do you loose any top end from the headers? do you need some other tuning toys?
Brian
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Old 04-18-2001, 09:33 AM   #4
Scoober01
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Post

Yup more toys are needed for sure but what...? Brian your still going to the auto-x right. PM me.
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Old 04-18-2001, 09:46 AM   #5
M a t t 2
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i don't get why a intake and exhaust would affect your fule that much. did you just notice this or has this always been going on.
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Old 04-18-2001, 09:48 AM   #6
Thug
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Post

I really dont think fuel is the issue, but you can always re-wire your fuel pump with 8 gauge wire. That should give you more fuel.
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Old 04-18-2001, 09:52 AM   #7
Scoober01
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I just noticed, I did a ECU reset with the install of the Headers and exhaust it was fine till yesterday I think. This was the first time I got up that high in 4th and 5th.
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Old 04-18-2001, 10:35 AM   #8
Scoober01
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Post

People I need some help here, real suggestions, I'm worryed about my car. If this isn't a lack of fuel issue, what might the problem be. Please help me out here.
Ryan D.
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Old 04-18-2001, 10:36 AM   #9
bratmantlz
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Question

i am guessing the exhaust is 2.5? right? does that make ya loose some top end? was it windy that day?.....
Brian
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Old 04-18-2001, 10:38 AM   #10
Scoober01
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No not really, it was nice yesterday, not windy or anything.
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Old 04-18-2001, 11:17 AM   #11
Strepto
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Post

what kind of gas are you using? do you hear an detonation ever?
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Old 04-18-2001, 11:19 AM   #12
Scoober01
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Post

Well I use 91 all the time. Never had any lower in the car.

Is it possible that a loss of back pressure may cause this?
Ryan D.
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Old 04-18-2001, 11:25 AM   #13
skidplatez
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Post

What makes you think you are running lean?

I don't see any mention of an A/F meter or an EGT guage.

Wait I just noticed that you live in Colorado, That is why you have less top end than some other people on the board(no air).



[This message has been edited by skidplatez (edited April 18, 2001).]
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Old 04-18-2001, 11:27 AM   #14
Scoober01
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Post

It was suggested to me. If anyone thinks it may be someting ells please give me suggestions.
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Old 04-18-2001, 11:32 AM   #15
skidplatez
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Lack of top end is not really a sign of leaning out. Actually engines tend to make more power when they run lean right up until they detonate. You need some sort of monitoring to find out what is going on without A/F or EGT guages you can't really know what's happening.

P.S. I really think it's the altitude
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Old 04-18-2001, 11:36 AM   #16
Strepto
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Post

before you go spending your money on fuel controllers or a chip that no one really knows how it works you really should get an A/F meter and EGT gauge if you think you're running lean. How many miles are on the car? What spark plugs are you running? A cheap fix could be replacing your fuel filter and spark plugs, and cleaning you air filter.
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Old 04-18-2001, 11:39 AM   #17
Scoober01
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I don't know man, I'm able to redline it in 1st 2nd 3rd but not 4th or 5th.

I have the stock plugs with magnecor wires.
The filter has less then 4000 miles on it.
Fuel pump--maybe ya.

I didn't have this problem at all till I installed the Gen III headers,mid-pipe and exhaust from Borla.
Could I have done the ECU reset wrong possible I didn't drive it correctly after the reset.


[This message has been edited by Scoober01 (edited April 18, 2001).]
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Old 04-18-2001, 01:14 PM   #18
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A quick $5 fix would be to go to pepboys and get you some NGK plugs, that will help out, and your probally running reaally rich not lean, is your exhaust tip black already? if so your running rich.
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Old 04-18-2001, 01:33 PM   #19
gavin
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Running 91 could be causing you to run rich. The engine is mapped for 87 and will try to adjust for the decreased detonation of the 91.

I'd run close to empty. Fill it with 87, reset the ECU, run through that tank, fill with 87 again, and then try your experiment again. (Actually, I'd recommend just not driving 110 )
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Old 04-18-2001, 01:36 PM   #20
bratmantlz
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i agree you should do at least 120,mph
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Old 04-18-2001, 01:57 PM   #21
gavin
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Post

You may just be losing too much backpressure, too. You have two things working against you. At that altitude, your backpressure is reduced, anyway, because the atmospheric pressure is reduced. And, as your speed increases, you'll increase the vacuum affect at the rear of your car, which reduces backpressure-exhaust is literally being sucked out of the system, rather than expelled.

Anyway, that's just a guess, but logically it makes sense.
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Old 04-18-2001, 02:09 PM   #22
Scoober01
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Post

Not bad Gavin that may be it. I hope thats it. I might be reinstalling the headers this weekend befor the auto-x, maybe a gasket isn't fitting right, I'll get new ones. I was just out on the HW and got it to redline in 4th gear but I was going down a hill but it was running fine I'm so confuzzed.
Ryan D.
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Old 04-18-2001, 02:31 PM   #23
DaveK
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I'd second the gas comment. I've heard that running 91 up in CO is like running 93 at sealevel. Thats why we can't get better gas up here in Denver. If that's true, you're running better gas than you need to by a bunch. I've got a MY99 and I was running with a 3" exhaust and a drop in K&N and didn't notice any adverse effects.
I'll be at the auto-x on sunday too. (SM#25)
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Old 04-18-2001, 02:51 PM   #24
Scoober01
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It might be the gas. I just filled up on 91 again befor a did that last run down the HW. I've used octain boost befor around here and it ran better than it ever had. But I didn't try it at 100/mph. I need a dang track.

I'm ganna post something in the RMIC forum and see what everyone in CO uses.
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Old 04-18-2001, 09:58 PM   #25
HamFist
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pm'd you Scoober. What's 6000rpm in fifth come out to? That's what I've hit now that the car's been tuned right. No the road wasn't perfectly flat, they don't exist in Colorado. But, it still scared that GSX . (This may come off as a little harsh, but I'm just lit and hyper) It sure wouldn't do that stock. Does that tell you how much fuel means to this car? Some people don't understand how intake and exhuast mods affect fuel. I didn't completely get it either, until I did it to my own car and felt the difference. It's still basic chemistry involving alcohol, oxygen, and a spark... popularly known as combustion! The byproducts of perfect combustion are carbon dioxide, and water. Bypassing the other four years of the degree I don't have, we'll say it's not the specific chemicals produced from the reaction that are the focus here, it's how many of each particle you started with and ended with. The ratios of the molecules involved is what's important! With an intake and exhaust, you've added more airflow, but none of the other part of the equation to make use of that extra air...meaning FUEL!!!!!!!!!!! It's like saying a 1-to-2 ratio is the same as 2-to-4 ...remember algebra? When you add more air and fuel in the correct proportions, you'll get more power. That power you feel is a mechanical byproduct of an increased energy reaction in the combustion chamber. "More in, more out" basically is how it works. I hope that made sense. I'm gonna go watch the Avs kill the canucks!

Gary
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