dropedss86

iTrader: (5)

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

alocker

iTrader: (10)

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

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

dropedss86

iTrader: (5)

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

Razor

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

Forcefed86

iTrader: (4)

slipping converter?

helga203

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

LS1-IROC

iTrader: (4)

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.

forcd ind

iTrader: (7)

Could be a lot of things, converter, tire spin, etc-where were you taking the boost readings.
Sometimes dynos are not friendly to certain combos, but the weight/MPH tell the truth.

dropedss86

iTrader: (5)

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

Forcefed86

iTrader: (4)

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

dropedss86

iTrader: (5)

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

dropedss86

iTrader: (5)

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

soloman369

iTrader: (13)

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...

dropedss86

iTrader: (5)

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

alocker

iTrader: (10)

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.

GJS440

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.

Bob@BruteSpeed

iTrader: (16)

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

dropedss86

iTrader: (5)

It's stock springs

dropedss86

iTrader: (5)

Would that cause low hp numbers

rpturbo

iTrader: (47)

It would be a contributing factor for sure.