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Old 07-05-2007, 01:02 PM   #1
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Default My car'* 1/4 mile time is poop.

Hello. I was influenced to throw at everyone some problems I've been having with my car. Here'* the forum where it started:
http://www.bonnevilleclub.com/forum/...ic.php?t=81205

I went drag racing, and I got a 16.434 sec quarter mile time with my 94 SSEi. I haven't changed the car mechanically since then, but I raced it with a FWI as the only major mod, and the change in it was that some muffler place couldn't weld together my deteriorated exhaust pipe, so they replaced the stock 2.5" with a 3". I've still got a stock cat & muffler.

Also, I realized iridium plugs are smoother than Autolites for some reason. Those were used as well. Here'* my last post on the previous thread:

Quote:
I actually drag raced that one time for both fun and a good basis for several diagnoses. I filled up my tank, did city driving for ~70 miles, filled it up again, and saw that I get 16.55 mpg. Same for the highway, and it'* 24.

My MAF sensor is kind of offset. I guess I should have cleaned it before drag racing, but it was following the race that I used an electronic cleaning spray to wash it out a bit. We let it dry, and immediately I had more "oomph."

I'm going to do some sensor replacement, and I've already got a brand new fuel filter whose replacement I'm debating based on the weather. I don't feel I need one, but based on the mileage, it would be a good idea given the mileage.
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Old 07-05-2007, 01:11 PM   #2
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Your 3" exhaust is part of your problem. You've lost a significant amount of low-end torque.

However, that'* not what'* causing your freeway fuel mileage to be 5mpg lower than average for a well-tuned S1 L67. You have multiple issues.
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Old 07-05-2007, 01:14 PM   #3
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I agree. You need to obtain a scantool and see what kind of KR you are pulling and such. WIth your mileage, it is possible you have some massive cracks on your exhaust manifolds. What about your transmission, has it been rebuilt while you owned the car? There are so many variables that can cause your slow 1/4 mile time, but if anything, obtain a scantool.
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Old 07-05-2007, 01:15 PM   #4
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Immediately the thing that springs out at me is the 3 inch exhaust. Thats too big for your application. You need to be MUCH more heavily modded to need it.

Did you replace the plug wires when you replaced plugs?

What sort of fuel pressure are you getting?

Some other thoughts would be that the stock cat might be clogged, because if I understand correctly, the cat has 287,000 miles on it right?

An O2 sensor might help to perk up your gas mileage, but wont do anything for WOT performance.

A scantool would be an excellent idea, especially since youre considering modding this car. You need to see if you have KR (Knock Retard) in stock form, figure out why, then you can mod.

EDITED: Sorry Will, I got confused, I know Rogue was using a stock muffler, so I thought the rest of the system was as well. Ill have to keep my naturally aspirated trap shut unless I know what Im talking about I guess.
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Old 07-05-2007, 01:24 PM   #5
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Most of the cars running 13.5 or quicker are now running 3" exhaust, including Rogue, the Bullet, and Chadow427.
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Old 07-05-2007, 01:40 PM   #6
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I would like to get rid of my resonators ASAP regardless of my crazy performance. It seems like a quick, easy "fix."

I replaced the plug wires with stock-grade wires from O'Reilly.
I don't know my fuel pressure. I'll find out soon.
No one has said much on the cat, but I want to get a high-flow one.
I think I have pretty new O2s, but I'd like to change them sooner or later.
Are there differences in scantool quality based on price, shape, etc?
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Old 07-05-2007, 02:32 PM   #7
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You only have ONE O2 sensor.

Don't delete your resonator (but I doubt you have one now considering what you said about your exhaust).

You need an Actron CP9110 scantool with GM cartridge and the 9115 cable. Try ebay. There'* a member here who will make the cable for you if you can't find one.

Search General Chat for OBD CABLE
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Old 07-05-2007, 02:39 PM   #8
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Check this out:
http://cgi.ebay.com/ebaymotors/ws/eB...m=290133213977

My ebay name is 1337computers. I hope I win. Also, would a laptop, a certain connector, and a program do the same job/similar thing/still need the scantool?
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Old 07-05-2007, 02:42 PM   #9
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Laptop scanning the hybrid OBD1/2 94/95 cars is somewhat difficult, can be expensive, and won't do anything that scantool won't do.

It looks like that auction includes the hard to find 9115 cable you need. I would suggest not bidding on it until the last minute. You just drove your own price up.
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Old 07-06-2007, 03:01 AM   #10
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Is was wondering if...
You checked your coil packs? Due to age they may not be providing a hot enough spark.

Do you know at what milage was the coupler last changed? Since your engine is such high milage I am curious as to how the supercharger has been maintained.

Also what is the peak boost you see at WOT?
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