Low hp #

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Apr 28, 2016 | 05:43 PM

dropedss86

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Low hp #

I just installed a d1sc on a bolt on Ls1 it was pushing 5-6 ps1 and it only put out 366 last time I dynoed the car without the d1sc it put out 344. The tune looked good and the graph is smooth. Afr was right on. I am running the 6 rib setup. From what I found online I would think I would put down closer to 450

Apr 28, 2016 | 06:08 PM

alocker

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From: NW Chicago Burbs

That sounds about right. See the turbo vs supercharger thread.

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What was the AFR? Did you boost leak check it before the dyno? Post up a graph.

Apr 28, 2016 | 06:13 PM

dropedss86

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I did not boost leak I will have to search to see how to do that. I would think I would get more hp with 5 psi than 20

Apr 28, 2016 | 09:28 PM

Razor

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From: SOFLO

Somethings not right.
5 psi and 22hp gain over n/a?

Apr 28, 2016 | 09:41 PM

Forcefed86

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slipping converter?

Apr 29, 2016 | 05:25 AM

helga203

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Sorry but 5-6 lbs of boost will not get you 450hp. You need to be around 10 ish.

Apr 29, 2016 | 05:45 AM

LS1-IROC

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Quote:

Originally Posted by helga203

Sorry but 5-6 lbs of boost will not get you 450hp. You need to be around 10 ish.

Are their trees on the planet you live on? 6lbs on a bolt on LS1 should have no problem hitting 450rwhp. He has a problem in the system.

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Apr 29, 2016 | 06:24 AM

dropedss86

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I think he was getting the boost # from the map sensor.

Apr 29, 2016 | 06:46 AM

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Forcefed86

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Check the RPM VS vehicle speed to see if the converter is slipping. What brand converter is it?

Apr 29, 2016 | 08:30 AM

#11

dropedss86

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It was a Performabuilt converter I will call the tuner to see if I can get the logs I am not sure if he saves them

May 2, 2016 | 10:13 PM

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dropedss86

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Here is the dyno sheet I am wondering if it could be valve float or weak springs. What should I log in my hp tuners to get to the bottom of this

Attached Thumbnails

May 2, 2016 | 10:42 PM

#13

soloman369

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Need more info on setup . What kind of fuel pump and injectors. You said reading boost off map sensor you don't have an actual boost gauge. You got a log of the run and I'm not talking about the dyno graph. Like rpm,tps,ltft etc...

May 3, 2016 | 06:06 AM

#14

dropedss86

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I do not have a log of the run I did not think about asking for one

I am running Semans 80 lb injectors and a Aeromotive 255 with hotwire kit hopefully the weather clears up so I can make some pulls and log

May 3, 2016 | 06:31 AM

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alocker

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From: NW Chicago Burbs

What springs are in there? I initially thought springs but the power usually drops off when you float. Your chart drops a bit but is still climbing at 6K.

May 3, 2016 | 06:52 AM

#16

GJS440

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My car with a stock 99 LS1 with a D1sc, 60# injectors and a 255 pump, Brute speed blower cam and comp cam valve spring kit on 8.2# boost made 543rwph through an auto.

May 3, 2016 | 07:34 AM

#17

Bob@BruteSpeed

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Quote:

Originally Posted by dropedss86

Here is the dyno sheet I am wondering if it could be valve float or weak springs. What should I log in my hp tuners to get to the bottom of this

The squiggly lines towards the peak hp look to me like belt slippage. The 6 rib blower belt has to be as tight as a guitar string. Bob

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