427 Assembled

[tpepmeie]

So, I took the car back to the DynoJet today. Actually, two DynoJets, one in the morning and one in the afternoon to confirm.

Hit 638rwhp (SAE) in the morning session. 548 rwtq.

I cannot get enough fuel in it from 5000-6500... no matter what I try, the AFR is 13.5:1. Fuel Pressure is OK, but no amount of change to the fuel table will fatten it up. Conclusion I am drawing is that the injectors are maxed out.

They were allegedly 26lb'ers, but I don't think that can be. Will have them tested, and probably go for 30's next time. I even changed the table offset to try to gain fuel, but wouldn't budge.

The afternoon session on the other side of town was 634 rwhp, with water temps over 200F. So I am pretty comfortable that the morning session is accurate (also made that number last August). It seems to be consistently at this number.

Will post the sheets and maybe a vid later.

Todd

[XfireZ51]

Todd,

Sounds like injectors are static. Have u confirmed DC% at WOT?
Also, not sure which injectors you are using but you might check the injector bias tables to see if they match the injector spec. Granted that will make greater diff at lower rpm but it just might give u enough headroom to bring AFR down.
Try increasing them 10-20% and see what happens.

[Schrade]

YiKEs!!!

Pretty big twister!

Looks like you're gonna' need the ZR12 Falconer with extended wheelbase to shoehorn it in!!!

[XfireZ51]

Todd,

Sorry. Just re-read ur post and saw that you had tried the Inj Offset, correct?
Or was that the VE offset.

[cvette98pacecar]

Originally Posted by tpepmeie

So, I took the car back to the DynoJet today. Actually, two DynoJets, one in the morning and one in the afternoon to confirm.

Hit 638rwhp (SAE) in the morning session. 548 rwtq.

I cannot get enough fuel in it from 5000-6500... no matter what I try, the AFR is 13.5:1. Fuel Pressure is OK, but no amount of change to the fuel table will fatten it up. Conclusion I am drawing is that the injectors are maxed out.

They were allegedly 26lb'ers, but I don't think that can be. Will have them tested, and probably go for 30's next time. I even changed the table offset to try to gain fuel, but wouldn't budge.

The afternoon session on the other side of town was 634 rwhp, with water temps over 200F. So I am pretty comfortable that the morning session is accurate (also made that number last August). It seems to be consistently at this number.

Will post the sheets and maybe a vid later.

Todd

Sweeeeet C4 ZR-1 638 RWHP, C6 ZR1 638 CHP.
Once Again...... Sweeeeeet.

[XfireZ51]

Todd,

There's a spot available at the Chicago 1/2mile shootout this June. Not far from the Indy area.

[cvette98pacecar]

Originally Posted by XfireZ51

Todd,

There's a spot available at the Chicago 1/2mile shootout this June. Not far from the Indy area.

Dom, I think Ronstar was looking for a spot.

[XfireZ51]

Contact Blake Hutchinson at wannagofast.com. I believe any spots available revert back to wgf and there's a waiting list. Ronstar should try there.

[tpepmeie]

Originally Posted by XfireZ51

Todd,

Sorry. Just re-read ur post and saw that you had tried the Inj Offset, correct?
Or was that the VE offset.

Tried several things, including the VE table offset. These injectors must be very small--VE table is maxed at 140, which clearly is only a band-aid fix to get enough fuel. It's like 13.5 afr from 4700 rpm to 6500. I think there is some more power in it with more tuning.

BTW, for those interested in how much the MAT timing retard affects these motors...on one run the motor was heat soaked and we forgot to turn the external cooling fan on, and it took about 3d spark advance out. Killed it by 20-25 ft-lbs across the board. I zero'd that table, put the fans back on and instantly got it back on the next run.

[tpepmeie]