Dyno fail

[03spoolindmax]

Had a local diesel dyno event today. I was first up on the rollers.

Just finished the truck up this past week. 4094/480 twin kit, hsp up pipes, lml manifold, lbz pump, stock injectors, SoCal stg 1 heads and a few other little things.

First pull on my street tune 373hp 697 tq

Decided to put it on my hot tune. Made 504hp 1008 tq

Could not get the 80 the light. Held 25k rail pressure. On the street I see between 10-15lbs from the 80 and around 45-50lbs total. On the dyno I couldn't even get 5lbs on the 80 with around 35 total.

It was on a dyno jet with a 5000lb drum. A little disappointing but oh well. I'll get it to the track in the next few weeks and see what it runs and go from there.

After that it's time for a beer or 30

 

[03spoolindmax]

Here's the dyno sheet

 

[hondarider552]

5000lb rollers proves it wasn't enough weight to load the truck. Don't let it bother ya!:thumb:

 

[03spoolindmax]

Yeah. Everyone said they should of got a picture of my face when they told me I made 373hp.

Last year with my lb7 and a 366 I made 575hp. Singles seem to spool a lot better on that dyno. Even the operator said twins are hard to spool on their dyno.

 

[delong_1]

um you wont ever make power unless you drive the atmo harder, you have a gate at all?

 

[LWATSON]

Correct me if I'm wrong but it takes longer to get a big single to begin spooling but once it begins it ramps up very fast. Twins begin earlier but ramp up slower? which would not do as well on a dyno?

 

[03spoolindmax]

No gate at all.

On the street it lights and comes on pretty hard. Dyno just wasn't loaded enough to spool it.

 

[03spoolindmax]

Correct me if I'm wrong but it takes longer to get a big single to begin spooling but once it begins it ramps up very fast. Twins begin earlier but ramp up slower? which would not do as well on a dyno?

That's almost what it did. Sounded like it was spooling at the beginning then fell on it's face once it got higher into the rpm range.

 

[mike diesel]

I did 721 on the dyno but could only get 35 psi from my s472. Normal is 43 on the street for me.

 

[DieselmafiaLLY]

I was there, his face was priceless!

Sent from my SAMSUNG-SGH-I537 using Tapatalk

 

[03spoolindmax]

Well I guess the dyno didn't lie. Ran the truck at the track today. Had a 1.8 60ft with 285/60r18 terra grapplers with a 13.02 1/4 mi at 103. Comp D calculator comes out to just shy of 500hp.

Rail holds steady at 26k. Egts were 1300* at end of track and I was seeing around 38 psi.

It's starting to look like a tuning issue. I'll be planning a trip to go see mark sometime in July and see what's going on.

 

[LWATSON]

What was your 1/8th? Just wondering if it fell off on the top end?

 

[03spoolindmax]

1/8 was right around 8.3x which seems right for my 1/4 time

 

[03spoolindmax]

I may ditch my 4094 in the valley and put my stock turbo back on instead. It seems as if it's a tuning issue but also wondering if my 4094 is choking it out. Truck barely even smokes unless I'm spooling the chargers at the line. Even then it barely smokes at all.

 

[LWATSON]

Yes an 8.3 seems in line with your 1/4, Id definitely have the tune looked at. If you were under 8 in the 1/8 th Id look towards fuel issues.

 

[CaptPhil]

How big of a tune is it? If you are holding rail that well have more pulse thrown at it and see what happens.

 

[03spoolindmax]

How big of a tune is it? If you are holding rail that well have more pulse thrown at it and see what happens.

It's supposed to be around 625hp. I'm not sure what the pulse is. I'm going to try and find that out sometime this week.

 

[WVRigrat05]

Put some 40's in it and wake it up