HELP!!! look at attached dyno sheet
 

http://members.cox.net/aw0/Photos/En...s/DYNORUN2.jpg

Ok as you can see at 5000 to 5500 rpm I am losing alot of HP with that dip. here are my car specs.

D16Y8 @ 9psi boost
f-max (turbonetics kit) using the MF2 fuel controller with the two extra fuel injectors.
JE / SRP forged pistons 9.0:1 compression ratio
Crower Econo Billet Rods
Crower stage 2 camshaft with valve springs and titanium retainers
Greedy Profec B-Spec boost controller

when I am driving and this occurs at 5000 - 5500 rpm it feels like all boost is gone and the car stops pulling hard. But if I take my foot off the gas then go WOT the problem goes away and starts to pull hard again.


another problem I noticed as of yesterday is that the car is detnating coming off the line in first gear only???

I pulled the plugs and they are black which I believe indicates that the car is running way to rich. Do you think that when I'm taking off from the line it is dumping to much fuel causing the detnation.

I believe the problem at 5000 -5500 rpm is also a rich / lean problem.

here is a website that talks about the MF2 controllerhttp://www.aquamist.co.uk/cp/mf2/techmf2/mf2tec.html

with this controller I can adjust the amount of fuel at 1000, 2000, 3000 RPM and so on...

any help is appreciated thanks.

I forgot to metion that I am using an OBD1 ECU

Could be a boost/exhaust leak pre turbo. What size piping are you using?

is the turbo in need of rebuild.

Was wondering when Josh would be here to the rescue :driving:

It sounds like somthing you would hear somone say if they had stock springs and a aftermarket cam..... My buddy had this hapen to him in his MR2. His A/F was way off and he had an Exhaust leak, the leak caused air to get in and mix with the unburnd fuel and caused it to ignite in the exhaust chamber while the valves were open and it messed alot up..... What type of plugs are you running, sounds like you need to read the tread about the Hot and Cold plugs for Turbo.... Colder plugs could solve part of the problem...

well thanks for all the responses and I am glad to say that I have solved all the problems at this time.

here is what I did.

The filter had come out of the missing link put a new one in solved the detnation problem.

Bought new NGK plugs.

adjusted the the MF2 controller to be leaner through 5000 - 7000 rpm and that solved the down curve it was boosting and pulling right through all rpm range.

I thought I might be getting to much back pressure in the in the catalitic converter so I made a straight pipe and took out the cat. all pipe is now 2 1/2".

It pulled very hard so I have a big :) again.

Now I just wonder what the true HP is with the drop at 5000rpm gone??? any one got a guess.

time to dyno again.

its time for another dyno run.

and if you have all that, why only 9psi, sounds like the internals could handle more.

does your dyno have a wideband? If not, maybe you should find one... fuel tuning on a hunch can cause serious trouble. Next time get on a dyno w/ a wideband O2 sensor, and I'd take it easy until then. ;)