LT1-LT4 Modifications 1993-97 Gen II Small Block V8

nitrous is done and testing this week

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Old Sep 16, 2009 | 03:53 PM
  #41  
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Are you running 2 ECUs w/ one for the spray?
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Old Sep 16, 2009 | 03:55 PM
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no..little hard to swap being under the dash. Jim is writing me 2 files for the car.
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Old Sep 16, 2009 | 05:29 PM
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The car is on the dyno tweaking the NA tune. The reason being my hotwire kit burned out as mentioned before and I am only running 1 pump now. The amount of fuel volumn did alter the way the car ran. I always had a cold start issue and had to throttle the car for a few seconds and now that is gone...reach in and turn the key and it idles great. The A/F was a little leaner on 1 pump v's the 2, so we are just playing with the A/F some.

I'm super happy with the combo since it just made over 460 rwhp
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Old Sep 16, 2009 | 06:28 PM
  #44  
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Originally Posted by LS1 SPEED
The car is on the dyno tweaking the NA tune. The reason being my hotwire kit burned out as mentioned before and I am only running 1 pump now. The amount of fuel volumn did alter the way the car ran. I always had a cold start issue and had to throttle the car for a few seconds and now that is gone...reach in and turn the key and it idles great. The A/F was a little leaner on 1 pump v's the 2, so we are just playing with the A/F some.

I'm super happy with the combo since it just made over 460 rwhp

Locked or unlocked?
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Old Sep 16, 2009 | 07:02 PM
  #45  
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runs were done locked

NA

462/431

N20

525/512

nitrous graph looks a little odd due to the converter flashing then locking,unlocking and then locking again

yeh I know it's not the best to do, but I trust my Yank/FLT combo

We ran a real safe tune to just make sure it's working and did not pull it past 6600.

20-21 degrees of timing
11.3-11.5 A/F
116 in the dedicated
93/100 in the fuel tank

I will work on the nitrous tune at the track to get it in the 12.0-12.2 area.



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Old Sep 16, 2009 | 07:50 PM
  #46  
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how much of a hp loss is usually seen when running with the converter unlocked?
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Old Sep 16, 2009 | 08:19 PM
  #47  
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unlocked was about 20 rwhp if I recall when the car was first put together

little more info :

62/46 with 11psi v's the 10psi recommended which is the reason it's rich

950 bottle pressure

I discovered when purging the system down after closing the bottle it did not look clean. Then after taking my bottle out ( which was over 1 year old ) it was damn near out of spray and seems to have air.

bottle is getting fully emptied and filled tomorrow for testing Fri

I know the #'s are low on spray, but I was not really looking for a # and rather the A/F being o.k to start with.
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Old Sep 17, 2009 | 10:31 AM
  #48  
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Damn those NA numbers are impressive!!! Was that N20 dyno just the 100 shot?
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Old Sep 17, 2009 | 10:45 AM
  #49  
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thanks Mike

it was the 150 shot, but as mentioned above the tune is very conservative and A/F rich. I was not looking for big #'s on the bottle, but to just wanted to check the A/F to be o.k to start tuning at the track.

+ I just weighed the bottle after removing it and it's is just about empty w/ 3#'s. This could not help and seems to be some air as well.

I will work on the tune at the track for the N20 tomorrow.
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Old Sep 17, 2009 | 10:53 AM
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3# of air deffinitly wasnt helpin. lol! See ya in the morning and hope to see ya at the track tomorrow night and watch that beast get down!
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Old Sep 17, 2009 | 11:00 AM
  #51  
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I'm not saying all air, but it does appear to be some air in the bottle when purged and or opening the valve.

I will not be in tomorrow, so the guys will take care of you @ 9a.m. There better be a red Formula at the track tomorrow testing with the new combo and good air.
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Old Sep 17, 2009 | 11:07 AM
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If things go well on the dyno it will be there!!!!
PS,I was JK about 3# air
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Old Sep 17, 2009 | 11:10 AM
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good and gooder
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Old Sep 17, 2009 | 11:12 AM
  #54  
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Engine seems to be loosing up nicely

Looks like I need to start thinking about a fuel cell soon too.

GL tomorrow, looks like the weather will be perfect for getting some nice runs in.
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Old Sep 17, 2009 | 11:17 AM
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YEP..seems to like the dyno

I will post results Sat. good or bad.
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Old Sep 17, 2009 | 11:57 AM
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Originally Posted by LS1 SPEED
YEP..seems to like the dyno

I will post results Sat. good or bad.
And the track
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Old Sep 17, 2009 | 11:59 AM
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yes..it does run a # as well.
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Old Sep 19, 2009 | 10:58 AM
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Sorry couldnt make it out. What happened? How did it run?
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Old Sep 20, 2009 | 08:57 AM
  #59  
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sorry to see you not make it...the track was there, but the air could have been better

NA 10.86@123 1.41 60 ft

N20

I want to work some more on getting the most from the 150 shot both traction and tune wise and move from there.

I did not go over the plugs Fri, but got the A/F in the 11.8-12.2 area and I was very happy with the results for the 1st time out

1.36 60 ft ..still more in it
6.40 1/8
107 mph 1/8
10.09 ET
132.5 1/4 MPH


I plan to put a little more timing in it, play with shift points and keep working on the window switch to get it to 60ft harder...went 1.41 on HP the same night.

I was a little worried this night so I tightened things up after Z8s put his LS1 street car on the bumper. I drove the car to and from the track and wanted to make sure I could make it back the 1.5+ hr trip.

I have to getting a alternator issue sorted out here and be back at the track in a couple weeks.
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Old Sep 20, 2009 | 09:18 AM
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SWEET!!!!!!!!!!!!

Funny, my alternator dumped on me yesterday 50 miles from home and no one had one. When the battery voltage gets low the trans and car do strange things LOL.

SUCKED.
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