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

Lost 100 HP over a Cam swap - HELP!!

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Old 05-18-2008, 01:19 AM
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Can you post up the dyno graph?
Old 05-18-2008, 10:58 AM
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I just got the cable in to hook up to the computer - i'll see if i can figure out datamaster and post the results on here asap.
Old 05-18-2008, 04:53 PM
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Here is the dyno sheet - i had the car re-tuned b/c the wide open throttle switch was not opening all the way. it gave me about 20 more hp. on the way back from the shop though, coming to a stop, the car idled low and then died - i had to crank it for about 10 seconds before it would start back up. after that, it would idle slightly higher (around 1.5 rpm).
Attached Thumbnails Lost 100 HP over a Cam swap - HELP!!-dyno1.jpg  

Last edited by spdracr713; 05-18-2008 at 04:54 PM. Reason: typo
Old 05-18-2008, 07:18 PM
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Originally Posted by spdracr713
-gas mileage has dropped from 280-300 miles a tank (18 gallons) to 120 miles a tank.


That's a big tank!
Old 05-23-2008, 06:03 PM
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Ok i got the datamaster readings - these are from sitting at idle for the most part - got the rpm up to 3 and let off. i also tested the fuel pressure - it's reading 36psi. when turning the key, it will go to 42, then drop and hold steady at 36. it has an aftermarket fuel pump on it that is 255lph.
i had to upload this file as a .zip since it did not recognize the .uni extension on the datamaster file.
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corvette052308.zip (57.1 KB, 17 views)
Old 05-26-2008, 12:26 PM
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I have another file i collected using datamaster - i did this one right - it's showing everything it should be. It's too big to post, so if you'd like to look at it, i can email it to you.
also, i hooked a fuel pressure guage up to the car while i was driving. It holds steady around 36-40 PSI, but when i'm at WOT, it drops to 32 PSI.
Old 05-26-2008, 01:02 PM
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what size injectors?
Old 05-27-2008, 11:56 AM
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Not for sure on the size of the injectors - i will pull one out and get the PN and post tonight.
Old 05-27-2008, 12:37 PM
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Email me it, I'll host it and provide a link. Click my name, it's my Y! Messenger email.

I think your fuel pressure is too low personally. Should be 39psi(could be 38) at idle (42 is right for turn key) and with the vacuum line off while idling, 43-43.5psi.

So your FPR might have kicked off :\
Old 05-27-2008, 09:12 PM
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It looks like i have stock injectors - i couldn't find the model number on the injector itself. here's a pic in case that helps.
Attached Thumbnails Lost 100 HP over a Cam swap - HELP!!-fuel_inj.jpg  
Old 05-27-2008, 11:21 PM
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Damn, shame I can't compare mine for you, 93s had 22# and 94+ had 24# :\ I'll see if they're black, I think they are.

Yep, look the same. I would pretty much assume they're stock. If you can read the small numbers off it, I bet the LT1 FAQ part number catalog can match them up.

Last edited by Formula350; 05-27-2008 at 11:29 PM.
Old 05-27-2008, 11:35 PM
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the only number i see on it is a W and then there is 73. othter than that...nothin,
Old 05-28-2008, 12:40 AM
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I'm going to go ahead and say that it's the stock one, especially after looking at this one on eBay.
http://i9.ebayimg.com/05/i/000/f3/15/e9be_1.JPG



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