[Tom Vaught]

Originally Posted by jdw_poncho

After being up 30 hours straight we got the engine dyno'd. Made some big power but had a few problems. Spend at least half the dyno session getting the engine wired and hooked up. Next time I go I'll have a better understanding what is needed to help save the time.

They spent some time trying get the FAST system tuned and capable of running the engine on methanol. Then started making pulls while trying to keep it fat enough. It seemed like he was constantly adding fuel and it would make more power.

We proved that a vacuum pump will not work on this engine. I seen people run their engines with it and without vac pumps so I decided to try it. It pushed oil out anywhere it could.

Finally made a few strong pulls. From the picture you can see it was making good power but we couldnt control the boost. They told me my exhaust housing are way to small and the waste gates didn't work very well.

It was blowing exhaust out the gate it just seemed like we couldn't get enough out to control it. This was the best run in all, then the bad stuff started happening. Next pull power was down about 100hp at the same 4500rpm. We stopped and pulled the plugs looked over the data and realized the fuel pressure was jumping around a little bit. After checking that out we decided to make another pull. This time the upper hose blew off and sprayed water every where at around 5400rpm. Hopefully its just a head gasket failure. But it ended my day with only 2 hours left in my dyno session. I brought a gasket but I didnt think I could get it done that quickly.

EGT's were staying good all day and never got above 1080 degrees. The last run we were worried about watching the fuel pressure and both of missed the egt's going over 1300 degrees. But it happened so fast that most likely I still would have had damage.

After getting some sleep today I'm starting to pull the motor down. All I know is I'll have to sell these turbo's and step up to a mid-size frame or a big single.

But you have to admit 1500ft/lbs of torque at 4400rpm's would make a hell of a street engine for someone if they wanted to buy the turbo's.

What we figured happened was the injectors were losing their signal or quit driving because the fuel pressure was jumping from 73lbs up to 100lbs within a few rpm's. Thats where the 1300 egt's came from on the last run.

Sorry to hear about your head gasket issue. See that you were running the engine at Steve Morris Dyno.

Come back with your refreshed engine and make some better numbers with the right turbos/ turbine housings.

Tom Vaught