I'm don't know what to say. Today I went to dyno my car with the plenum installed. Well, I didn't gain any power. Based on my based runs couple weeks ago, I gained maybe 1 WHP. I don't know what's wrong, but I will un-install the plenum and make sure everything is secured and no leak then bring back to the dyno shop to do couple more runs.



Patrick

 

something is definitely wrong here. sorry to hear that man.

 

Is the plenum the only thing added since your last dyno or are you comparing your stock-only base dyno to all those extra mods?
--
Jeff

 

Im sure hes talking about just adding the plenum.

 

Just added the plenum to the setup. Hopefully after checking everything and re-dyno, the number will be different. If not then I will sell the plenum .

 

do a dyno with an a/f monitor. I bet you are running so lean you are losing power. That is what is happening with jason at performance nissan!

 

is there certain mods that (he has listed) that tend to make a car run lean????

 

i second what spazpilot said, use a wideband sensor to check your air/fuel ratio. if they did this when you dynoed please post your dyno sheet, and if you didnt i would definetly go back and pay the extra $20 for it cause it could save your engine. the only mod that could possibly make it run lean is the plenum. it might be the combination of the cai and the plenum, but still that would be a stretch. plus, alot of people on this board are running with a cai and crawford plenum, seemingly without problems (although i havent seen an a/f #'s for this specific setup).

 

This situation sounds familar.

 

With those other mods, I can see a low PEAK hp change being possible. You have done a good job of making a "more" free flow setup. Check your hp at higher rpms. If it is not significantly higher, then you have a problem. Our observed HP gains all happened between 12.8 and 13.5 on the A/F meter, so use that as a basis on your next run. Also if you want to make things more interesting disconnect the AEM for a pull. Not saying that it is a problem as you have dynoed with it before, but Paulo here gained 9-11 HP when he took it off (when base lining before the procharger went on).

 

Has anyone ever flow benched are plenums? And then flow benched the new plenum? How do you know the stock one doesnt flow good?

What is done to the plenum to make it better?

 

Yes, search the past posts. To sum it up, it had a 30% loss to the front cylinders. With the new redesigned plenum it went down to a little under 5% loss.

 

Post up the dyno sheet

 

Do you have a TS ECU reflash?

 

I don't have the TS ECU. Here are 3 runs that I did. Lost 3 MAX TQ.

run2
run3
run4

 

how can I convert the chart into a readable format? My html editor doesn't seem to be doing the trick.

 

how much whp and torque do you have from the dyno? can't see the dyno sheet.

 

go to www.dynojet.com and download the viewer.

 

I stongly suggest the TS ECU with your current modifications. We have tested many differnt "maps" and one way either side makes a big difference.
The MAF is also another area to look at to make sure there isnt anything wrong.
Also resetting the system by putting it in diagnostic made and idle learing is also a good thing to do after those type modifications.

 

Can putting it in diagnostic made and idle learning be done without a Consult unit?