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

Dyno blues

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Old Sep 29, 2011 | 12:25 PM
  #21  
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^^^^ ouch lol. Id take it to the track before you rip it apart. Also if it runs leave it in and build a diff motor and throw it in when ur ready. Nothin worse than ur car on jack stands for months!
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Old Sep 29, 2011 | 01:25 PM
  #22  
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My setup dyno'd low But runs damn good at its race weight. Fastest 1/8th to day is a 7.23@94mph with 2000DA. My setup put down 388rwhp unlocked. Clean you MAF take it to the track and then see what you think.

Keep in mind your track times may not be exactly what you were expecting either if your car isnt set up for the track (good tires etc) but at least it will give you a mph to compare too.
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Old Sep 29, 2011 | 02:11 PM
  #23  
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I've said it before and I'll say it again, numbers don't mean jack all that matters is what it'll do at the track. I want a track king not a dyno queen.
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Old Sep 29, 2011 | 03:07 PM
  #24  
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Post the graph so we can see if there are any obvious problems.
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Old Sep 29, 2011 | 03:36 PM
  #25  
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seeing the dyno graph might help us help you a bit

mid-length headers are going to cost you some power

was the converter locked or unlocked? I doubt much loss from suck a small stall which BTW is not a good match for the combo.

what induction is on the car?

I see your concerns with the low #'s, but it's also just a dyno and doesn't dictate how the car will run.
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Old Sep 29, 2011 | 04:34 PM
  #26  
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This is the Dyno Sheet.
Attached Thumbnails Dyno blues-imag0087.jpg  
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Old Sep 30, 2011 | 10:31 AM
  #27  
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This thread is almost identical to my issues a while back when my car was cam only: https://ls1tech.com/forums/lt1-lt4-m...dyno-help.html

If anybody recalls, I picked up 70 RWHP with a simple spark plug change. Not a single person recommended this LOL.....check some simple stuff first before you start blaming your head porter and what not like other idiots on here. Do a leak down test and change your plugs and see what happens.
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Old Sep 30, 2011 | 10:35 AM
  #28  
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Surely your not using E3 spark plugs...that was my whole ******* problem
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Old Sep 30, 2011 | 01:35 PM
  #29  
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Originally Posted by AChotrod
Ya thats the answer ******* stock heads would put down those numbers. Try actually building something that runs then you can put you 2cents in.
I'm a hopin' he was a jokin'
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Old Sep 30, 2011 | 01:36 PM
  #30  
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Originally Posted by ahritchie
This thread is almost identical to my issues a while back when my car was cam only: https://ls1tech.com/forums/lt1-lt4-m...dyno-help.html

If anybody recalls, I picked up 70 RWHP with a simple spark plug change. Not a single person recommended this LOL.....check some simple stuff first before you start blaming your head porter and what not like other idiots on here. Do a leak down test and change your plugs and see what happens.
That's what's funny about LS1tech. You could have issues forever and until just the right person looks at it you may never get the advice you need. I finally gave up a few weeks and *****'d my issue out everywhere, managed to get a correct answer out of the process though.

OP I'd go see what it traps, but as stated those numbers are def. low. My hotcam/bolt ons car put down 356rwhp, granted that is through a t56, but for a heads/cam car you are def. down on power.
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Old Sep 30, 2011 | 01:46 PM
  #31  
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Originally Posted by ahritchie
This thread is almost identical to my issues a while back when my car was cam only: https://ls1tech.com/forums/lt1-lt4-m...dyno-help.html

If anybody recalls, I picked up 70 RWHP with a simple spark plug change. Not a single person recommended this LOL.....check some simple stuff first before you start blaming your head porter and what not like other idiots on here. Do a leak down test and change your plugs and see what happens.

Who blamed the head porter?

Just Lawhead and he was being sarcastic, so who is the idiot? Oh yeah the guy who also tried E3 plugs.
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Old Sep 30, 2011 | 02:40 PM
  #32  
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Originally Posted by 96capricemgr
Who blamed the head porter?

Just Lawhead and he was being sarcastic, so who is the idiot? Oh yeah the guy who also tried E3 plugs.
You missed my point completely. Instead of accusing the OP of having a poorly thought out setup that you don't like being the cause of his low HP why not give some constructive advice?? I'm not "Ms. Cleo" the psychic..Lawhead never said he was sarcastic or joking...I don't even think he has a LT1 anymore so his opinions are moot now Obviously those results are sub-par, why not try to actually help the OP instead of insult and talk smack? Isn't that the whole damn point of this forum or am I missing something here?
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Old Sep 30, 2011 | 03:19 PM
  #33  
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I had the car on the dyno with ac delco platinum plugs and the power numbers were nearly identical to the ngks that are in it now. I will start checking the basics this weekend and hope fully find something easy...
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Old Sep 30, 2011 | 03:32 PM
  #34  
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The first time found out my fuel pump was dieing and at 4500rpms was at 22psi. installed the walboro 255, changed spark plugs, set fuel pressure to 40psi, and replaced the fuel filter. Also had a driverside o2 that would not read and ended up replacing the pcm to get it reading. The numbers that time were 321hp and 305 lb/ft. so even after those issues it only gained minimal hp. This car is going to drive me insane....
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Old Sep 30, 2011 | 03:36 PM
  #35  
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Check the plugs wires, do compression check, clean maf. Did it have any knock retard? How much timing are you running? This may sound stupid but are you running 90+ octane fuel. If you cant get to the track. Find one of your buddies car and race them. So you can compair.
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Old Sep 30, 2011 | 03:44 PM
  #36  
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Originally Posted by Lt1chicken
Also had a driverside o2 that would not read and ended up replacing the pcm to get it reading.
You had to replace the PCM because of an o2 not reading? Sounds odd...sure it's not a tuning issue with the PCM or bad o2? Any exhaust leaks?
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Old Sep 30, 2011 | 09:36 PM
  #37  
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Originally Posted by ahritchie
You had to replace the PCM because of an o2 not reading? Sounds odd...sure it's not a tuning issue with the PCM or bad o2? Any exhaust leaks?
I was able to get on with my snap on solus and found it would not read. Tried a new sensor and an overlay with no resolution. Replaced the pcm and it began working instantly. Also i only run sunoco 93.
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Old Oct 1, 2011 | 07:08 AM
  #38  
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Originally Posted by ahritchie
You missed my point completely. Instead of accusing the OP of having a poorly thought out setup that you don't like being the cause of his low HP why not give some constructive advice?? I'm not "Ms. Cleo" the psychic..Lawhead never said he was sarcastic or joking...I don't even think he has a LT1 anymore so his opinions are moot now Obviously those results are sub-par, why not try to actually help the OP instead of insult and talk smack? Isn't that the whole damn point of this forum or am I missing something here?

My advise was constructive, it was don't buy on price and expect the topend result which is what so many here do.
I think a post from Ed Wright is fitting here.
https://ls1tech.com/forums/15444736-post17.html
I know how to get a result, and am happy to help those who are willing to be helped.

The point of the forum should be to help eachother BUT most want to come here after putting together something mediocre and be blindly praised for it.

People want their decisions praised not resolved when they don't work.
Far as not understanding Lawhead's sarcasm forums are useless without knowing the cast of characters that is what newbs have to learn before paying attention to the tech content.

You get a LOT of folks benchracing what a setup should do even when the actual real world result is consistently well behind that. Those drastically outnumber those who do know what they are doing and so the guys who should be listened too, get ignored.
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Old Oct 1, 2011 | 07:57 AM
  #39  
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This is DEFINITELY not the reason why you are make super low RWHP, but switch to a 58mm throttle body. That 52mm is way to small for your build. I've got 2 I'm selling if you need one. One is ported and polished BBK, and the other is a BBK non modified in any way like new.
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Old Oct 9, 2011 | 04:48 PM
  #40  
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Looks a little rich on the afr. Definitely go over basic ****. Like most said, the dyno is not the be all end all. Run it down the 1/4 and see what the mph is, it will tell you what the motor is doing and power being made.
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