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Parts Mismatch??

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Old 07-25-2003 | 09:28 AM
  #1  
Black 91 Z28's Avatar
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Joined: Oct 2001
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From: Starkville, MS
Car: 1991 Camaro Z28
Engine: 350
Transmission: 700R4
Parts Mismatch??

Well, I got done with my intake and Cam install and I'm not happy with the results. I pulled the motor and polished and gasket matched my heads and put a Comp 08-302-8 cam in. I also added SLP runners and siamesed my base about 1.5" in. The SLP runners were already siamesed in 1.5" in on both ends. The plenum was also ported to match the runners.

The cam's specs are:
Int dur 210* at .050
Ext dur 220* at .050
Lobe seperation 112
Lift in Int and Ext .48"

Othere than that I've done full exhaust. Well, I've dynoed twice and that is what is shown below. The "old" dyno is from when I just had exhaust. The "current" dyno is where I'm at now with the cam, intake, etc.

I went to the track and managed a 14.7@92.96 So as you can imagine I was a bit unhappy. I looked at some data I logged and noticed it was pulling 5.5* of timing out on the 2-3 shift. Since them I've put my timing back down to 6*.

So, I'm curious if I have a large pars mismatch or that I need tuning really bad. Tuning will be my next thing to do because it's bottomed the BLMs out at 108.

Anyways, I'm kinda in limbo about what is wrong. So any light that you can shed on it would be nice.

Thanks,
David
Attached Thumbnails Parts Mismatch??-dyno.jpg  
Old 07-25-2003 | 01:04 PM
  #2  
RedIrocZ-28's Avatar
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Joined: Mar 2002
Posts: 328
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From: Grand Rapids, Michigan
Car: Iroc-Z
Engine: 355 AFR'd HSR
Transmission: 700R4
Your BLM's are 108 at idle or cruise and you wonder why you're running so slow?

I'll tell you right now you need tuning.
Old 07-25-2003 | 01:39 PM
  #3  
daxfas26's Avatar
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Joined: May 2003
Posts: 168
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From: tyler
Car: cobalt ss/sc, 91 z28, 92 z28
Engine: 385 stroker
Transmission: 700r4
Axle/Gears: stock 10 bolt 3.73
what is BLM?
Old 07-25-2003 | 02:03 PM
  #4  
Black 91 Z28's Avatar
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Joined: Oct 2001
Posts: 571
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From: Starkville, MS
Car: 1991 Camaro Z28
Engine: 350
Transmission: 700R4
Originally posted by daxfas26
what is BLM?
In a nut shell, its part of the computer system used adjust the Air to Fuel Ratio. If it's perfect it has a value of 128. Less than 128 its compensating for being rich. Over 128 its compensating for running rich. If you want some more info search through the DIY Prom board with BLM in the subject.
Old 07-25-2003 | 02:12 PM
  #5  
TRAXION's Avatar
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Joined: Jul 1999
Posts: 2,844
Likes: 3
From: Maryland
Car: 2005 Subaru STI
Engine: 153ci of Turbo Power!
Transmission: 6-Speed
I'm confused here. Your horsepower went from 280 to 330?!? Something does not add up here. With 330rwhp you should have easily achieved better than 92mph. Where did you dyno?

My only guess is that something happenend between the dyno and the track.

Tim
Old 07-25-2003 | 03:09 PM
  #6  
camarojoe's Avatar
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Joined: Nov 2000
Posts: 812
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From: Indpls IN US
Car: 91 Z28
Engine: Forged 383
Transmission: Pro-built 700R4
Traxion, his hp went from 215 to 240rwhp, I think you were look'n at the tq curve.

I definitely think that most of the problem is in the tune as stated above. At least start from there and move on.
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