kazdevil

Hi,
I need you advice. I went to the dyno shop and I was disappointed with the result- I dont know if I should but I expected more power- .The engine made 671rwhp @ 6500 rpm and 583rwtq @ 5400 rpm. That's with 15psi boost,_ YSI with 2.75'' pulley and 7'' crank pulley, 95 octane fuel and 35 deg of total timing air/fuel ratio was 11.8- 12.2 . Charged air temp was 24 deg C.I need to know what I did wrong or is it the engine combo.your suggestion will be appreciated. Thanks.

engine specs,
- Vortech supercharger- YSi-trim.
- Vortech aftercooler.
- 396 ci, 8.0:1 Comp
- AFR 227 heads part# 1076
- Victor JR single plane intake
- LS1 90mm TB
- Cam: hydraulic roller Duration@.050 248/254 lift .562/580 lobe 114.0
- JESEL shaft mount rockers 1.5
- AFR hydra rev
- Hooker Long tube headers
- FAST Classic ecu.
- Edist- coil per cylinder-LS1 coils

jason02Z

iTrader: (10)

that low of comp. might do it. the motors gotta make some power to turn a blower too. you will prob need some more boost and meth

LS1-NAVY

iTrader: (1)

auto or 6 speed??

white01ss

iTrader: (37)

Cam seems kind of big for this application. I'd bet your forcing unburnt mixture right out the motor. I'd give Patrick G a buzz and have him spec out a new cam specific to your motor. At the very least he would know if that cam is costing you power or not. A bump in compression (to 8.8-9.2) would help as well. I just know enough to be dangerous.

T/A KID

iTrader: (12)

What type of inlet on the blower? I would think that combo wouldnt have trouble doing 800rwhp. 6-speed or auto. What type of dyno, any graphs? May be having belt slip also, many variables.

SincalT/A

iTrader: (16)

You should log boost readings in the intake track.Check for excessive backpressure in the exhaust or vacum before the blower.

How much cfm is the after cooler rated at?

Can you get a preaftercooler boost reading?

Sumthin definatly holden you back.Also at that compression/setup your sweet spot should be somewhere round 18-20psi on straight pump gas.

Z8'S

iTrader: (6)

I added what my combo was the only time it was on a dyno(mustang dyno)750 rwhp @5000 rpm 17 lbs. of boost went into valve float . Then upgraded the springs and ran the engine to 7500 rpm . There is definetly something wrong.

Jon@BruteSpeed

iTrader: (3)

Need more compression...9.5 or a little better.

KissMySSo1

iTrader: (2)

looks good to me. run 20 lbs it will make 850

kazdevil

Its manual trans with mcleod street twin clutch.Boost reading before the cooler and after are almost the same.The cooler is water to air that Vortech make for LT1.Below is what my wideband commander recorded.I will post the hp an tq later.

run 4.djl


Time TP Boost RPM AFR W R

75.036 2 -6.3 1681 12.8 0 0
75.145 2 -6.3 1690 12.7 0 0
75.255 2 -6.3 1692 12.5 0 0
75.364 2 -6.5 1696 12.4 0 0
75.473 2 -6.5 1698 12.4 0 0
75.582 2 -6.5 1710 12.4 0 0
75.691 2 -6.5 1717 12.4 0 0
75.801 2 -6.3 1710 12.4 0 0
75.910 2 -6.5 1717 12.4 0 0
76.019 10 -6.0 1726 12.5 0 0
76.128 99 0.9 1816 12.5 0 0
76.237 99 1.1 1856 12.5 0 0
76.347 99 1.2 1931 12.4 0 0
76.456 99 1.2 2010 12.4 0 0
76.565 99 1.4 2100 12.5 0 0
76.674 99 1.6 2168 12.5 0 0
76.783 99 1.8 1931 12.6 0 0
76.893 99 2.0 2332 12.7 0 0
77.002 99 1.8 2413 12.7 0 0
77.111 99 2.5 2499 12.8 0 0
77.220 99 2.1 2589 12.8 0 0
77.329 99 2.3 2677 12.8 0 0
77.439 99 2.5 2778 12.7 0 0
77.548 99 2.9 2873 12.6 0 0
77.657 99 3.2 2972 12.5 0 0
77.766 99 3.2 3075 12.5 0 0
77.875 99 3.4 3176 12.5 0 0
77.985 99 3.9 3270 12.4 0 0
78.094 99 3.9 3392 12.4 0 0
78.203 100 3.9 3494 12.3 0 0
78.312 99 4.3 3600 12.1 0 0
78.421 99 4.7 3712 12.0 0 0
78.531 99 4.8 3823 11.8 0 0
78.640 99 5.4 3932 11.7 0 0
78.749 99 5.7 4066 11.6 0 0
78.858 99 5.9 4194 11.5 0 0
78.967 100 6.1 4304 11.4 0 0
79.077 100 5.7 4431 11.3 0 0
79.186 99 6.3 4565 11.3 0 0
79.295 100 7.2 4702 11.4 0 0
79.404 100 7.4 4834 11.4 0 0
79.513 100 7.2 4973 11.5 0 0
79.623 99 7.9 5112 11.5 0 0
79.732 99 7.7 5228 11.6 0 0
79.841 100 9.0 5375 11.6 0 0
79.950 100 8.8 5521 11.6 0 0
80.059 100 10.1 5620 11.6 0 0
80.169 100 9.5 5770 11.5 0 0
80.278 100 9.7 5888 11.5 0 0
80.387 100 11.0 6010 11.4 0 0
80.496 100 11.1 6139 11.4 0 0
80.605 100 11.5 6261 11.4 0 0
80.715 100 11.9 6376 11.5 0 0
80.824 100 12.2 6496 11.5 0 0
80.933 100 12.0 6621 11.5 0 0
81.042 100 13.3 6711 11.5 0 0
81.151 100 13.8 6790 11.4 0 0
81.261 100 14.7 6871 11.2 0 0
81.370 100 14.7 6926 11.3 0 0
81.479 100 15.1 6857 11.5 0 0
81.588 98 15.1 6672 12.0 0 0
81.697 0 3.2 6672 12.4 0 0
81.807 0 -8.3 6545 12.4 0 0
82.087 0 -8.8 6496 12.3 0 0
82.197 0 -9.2 6424 11.7 0 0
82.306 0 -9.6 6388 11.3 0 0
82.415 0 -9.7 6341 10.8 0 0
82.524 0 -10.3 6330 10.5 0 0
82.633 0 -10.5 6238 10.7 0 0
82.743 0 -11.0 6205 11.2 0 0

SincalT/A

iTrader: (16)

What does your exhaust do after the headers?

Boosted One

iTrader: (6)

A better cam for boost and Higher compression are where I would start. The rest should fall into place. You still made great power considering the overlap in that cam. You have the cam card?

kazdevil

Cam card:
GRIND# LT1 3318S/3319S HR114.0
Valve timing open close
@.050 int:10 btdc 58 abdc
exh: 61 bbdc 13 atdc

Boosted One

iTrader: (6)

That's over 40 deg overlap! take your intake duration + exh. duration divided by 2 then Minus (lsa x 2)

You are blowing boost right out your exhaust.

YSILT1

iTrader: (6)

Take the hydra rev out. I had that in my old setup and it cost me over 80RWHP.

I made 700RWHP with a stock intake and ported stock heads. Smae YSI with 15 lbs of boost. The car should be in the 750 to 800 rwhp. I would lean in toward the rev kit. post a graph so we can see.

My machines said the only thing he could figure is that the rev kit was causing some sort of weird harmonics in the valve train.

engineermike

The cam and the compression can be made to work. However, the intercooler is on the small side.

You NEED to take pressure readings before and after the intercooler. When I switched from a T-trim @ 13 psi to a turbo at 21 psi, my vortech aftercoler became a restriction. I was losing around 4 psi through the intercooler alone. I upgraded to a huge Bell unit and made the same power at 17 psi that I had been making at 21.

MillsMotorvation

+1 I got a Grandnational with a V6, and 8.5comp, i make approx 600HP with 24psi, i have turbo tho. I s taht all the supercharger can put out?

venom ws7

iTrader: (13)

I'm not an expert but isnt 35 degres of timing is way too much for Supercharged or Turbo car even with 8:0.1 compression??

IMO The car either needd more boost (20lbs or more compression 9:0.1 or 9:5)

stevieturbo

35deg does sound like a lot of timing.


And dont get too hooked on numbers. Some dyno's read low, some read bullshit, and some read in the middle.

How does it perform ?

With a CR as low as that though, wind more boost into it.

lmt0705

iTrader: (7)

my vote is for way to low on compression and wrong cam for boost