ecoman35

Have a LQ9 with 1 3/4 longtube headers, martin smallwood custom cam 222/226 586/569-114+2, stock heads and intake.
2800 stahl in a 200 4R trans non lockup. 4:10 gears.
just had tuned 350rwhp 405 rwtq. in a 72 Chevelle.

Any thoughts

G Atsma

What are the cam specs?

ecoman35

added cam specs. FYI this was on a Mustang Dyno.

Tuskyz28

Mustang dynos are very stingy. I've seen stroker LS motors struggle to clear 500 rwhp on a mustang dyno.

gagliano7

What rpm did he stop at? With 405 torque i would think the horsepower would be higher.

tech@WS6store

iTrader: (2)

A dyno graph would be very helpful!

ecoman35

here is a copy of the dyno sheet. said he found a burnt plug wire after the pull and was already off the dyno so the numbers should be a little higher.

tech@WS6store

iTrader: (2)

Something seems very off. And there is quite a bit of tuning left in it it looks like.

Did i read that right of 75# injectors? Im guessing boost later?

Starting the dyno run so late causes the graph to look odd, but so does the forced scale.

ecoman35

they are resized truck injectors he had on hand. said the stock ones were maxed out at 5000 rpm. was not really thrilled with the tune. torque seemed to drop off like a rock.

tech@WS6store

iTrader: (2)

75lb on a stock engine is a waste esp a resized stock inj.
Id go somewhere else and get some 8.1l or 5.3l fle fuel injectors and have it retuned and dynod.
Slowhawk may be in your neck of the woods.

sbf2

i think the numbers are very good with that small cam,on a dynojet it would be close to 400rwhp.i bet it has alot of usable power

ecoman35

this is the first time on a dyno. is it normal for the torque to drop so fast? most dyno sheets i have looked at are totally different not such a extreme drop.

KW Baraka

iTrader: (7)

No. It's not.

100% agreed.

I would go with something like 42LB injectors. But that's just me.

KW

tech@WS6store

iTrader: (2)

On a truck the flex fuel 5.3 inj or the 8.1l inj are plenty for quite a bit of power and drop in.