Decision Done
Thread Starter
Senior Member
Joined: Aug 2002
Posts: 168
From: Germany
Originally Posted by jspecracer7' date='Apr 24 2003, 07:14 AM
nope. I ran 850 x 4. Never got them bored out to 1300 X 4....
either way, I'm using 550cc primary and 1680cc secondary. Runs real good. I will eventually be going 550 primary/1680 secondary/720 subs....since I'm going T-45S
either way, I'm using 550cc primary and 1680cc secondary. Runs real good. I will eventually be going 550 primary/1680 secondary/720 subs....since I'm going T-45S
so I will use 850s / 1300s on the T78. can't wait to run the setup.
stuff will be here by the next week and on 10.-11.05 we have a promising 1/4mile event called "Bitburg 1 on 1"
I'll be prepared.
Senior Member
Joined: Sep 2002
Posts: 2,550
you'd be better off with 550 x 1680's.. No matter what you need to get the computer rewritten for injector change over etc to get it to really work right with larger injectors. If you get the datalogit I can help you with setting it up to run right and get the injector change over to occure smoothly.
with the 550 primarys it will be easy to tune everyday driving and you'll get good gas milage as well.. We've played around with moding the primary fuel rail and running the 850 side feed injectors but it will always run way rich on the bottom end due to poor atomization of the fuel because the spray pattern of the short 850's doesn't work well in the primary injector area as it sits too high. It will also be cheaper to run the 1680's and sock 550's as well..
with the 550 primarys it will be easy to tune everyday driving and you'll get good gas milage as well.. We've played around with moding the primary fuel rail and running the 850 side feed injectors but it will always run way rich on the bottom end due to poor atomization of the fuel because the spray pattern of the short 850's doesn't work well in the primary injector area as it sits too high. It will also be cheaper to run the 1680's and sock 550's as well..
Thread Starter
Senior Member
Joined: Aug 2002
Posts: 168
From: Germany
yeah, thanks dragon.
I'll put in the 850/1300s for the drag event now (no time to wait for other stuff). later I'll get the datalogit and 1680s for sure. will come back to you
Vosko: I checked the oct. numbers. race gas has the same oct (110) but the pump gas is really different. your 93 is our 98. but we just got the new 100oct at the station which should be 95 in the states.
I'll put in the 850/1300s for the drag event now (no time to wait for other stuff). later I'll get the datalogit and 1680s for sure. will come back to you
Vosko: I checked the oct. numbers. race gas has the same oct (110) but the pump gas is really different. your 93 is our 98. but we just got the new 100oct at the station which should be 95 in the states.
