How would I check if I have a tune? Given the A/F goes from lean to progressively rich, I don't know how this could be without a tune, so it must have had one in it's past life with a different owner.

I agree it starts off way too lean in the lower rpms. I will keep a close eye on the a/f ratio on each run. I have bought a a/f gauge to put in the car to reduce the chances of melting something before it gets to the dyno.

Since I now have ported intake parts a new baseline cannot be done. But we do know that my baseline was very close to Robs and Marcs, so that is just how this dyno reads. The brand is dynaflow, this is just how they read. Dynaflows read low, Dynojets read high.

Also as to the boost. I've found a fresh genV blower with very low miles that will be fitted with an upper pulley. When I get the TB back from Maxbore I plan on adding the new blower then doing a new dyno run with the added mods of:

82.5 mm TB
port matched elbow
ported and polished intake manifolds
Fresh blower with upper pulley.

If the air fuel gauge says I am not about to melt something, I will take it to the dyno to see what gains these mods give me. If Mr. Air Fuel gauge says too lean, I will install the fuel pressure regulator and see if that helps get back into a safer zone first.

 

I agree they do whine. Here is a link to an XJR with ported blower, smaller upper pulley & larger lower pulley. I think the car made 370 rwhp.

 

I like the whine!

So was Viapa's car at 373 RHP the highest Eaton powered yet?
This 370 is within the margin of error so can be considered equal?
What type of dyno was this?

 

If you do have a tune, it's not helping anyhow, so why not just re-flash the ECU with the factory program using an IDS?

At least you know where you'd be starting from then...

 

I have some feelers out in different directions, so we'll see what comes back

But yes, this could be a safer way to start fresh again.

 

Viapa and Thundercat made 373 and 380 rwhp respectively with same mods on a dynojet.

Looks like they still had the stock restrictive intake tube. A proper intake would be good for 30 hp or more. If they had stock cats, add another 10 hp for downpipes. Porting inlet, manifolds, larger ported TB; another xx? hp.

Not saying you can just add these gains directly to their numbers above, but gives you an idea.

 

The Youtube video is the Thunderkitten's car. I was there during the runs.

 

oh, I see it was a dynojet. OK good to know similar mods gave similar results on the same type of dyno

 

I would still ask why there is a difference in power levels between the Superflow and the Dinoyet ones. Here is just a quick search where an article displays relativly the same numbers between a Dynojet and Superflow
Chassis Dyno Guide Photo 18

Dynos that can apply load need to be calibrated/baselined (don't know the right word) as far as I know, so you could check when theirs was.

Also ask if they used the inertia method (like an Dynoyet) or with a load (eddy current).