8ALTNG

iTrader: (1)

Ok. Last year I made one run with my built trans and was making 389 rwhp. I ran 12.6 @104 and i was lifting one of my heads of the block so i was only at like 80% power. I go out this year and run a 12.6 @106 the other day. The track was cold but my 60' were still 1.7x's. Also i now am making 435rwhp and have 4:11 gears. What is goin on. I need some help on where to set the shift point on edit bc i am going throught the traps at like 5000 in 3rd. help me please!!!!!

whitt1

If you are running a smaller pulley you might be getting knock reduction that is negating most of your power gains in third gear.Or you may be maxing out the revs on your supercharger and losing boost at higher revs.I think you need to log a couple of passes to see what is going on.You might just need to run 104 octane unleaded at the track and switch to a larger pulley on the street.

Flyer

iTrader: (1)

What are symptoms of lifting a head? I thought when that happened all hell broke loose.

I wish I could get 1.7 60' times. I can only manage to get 1.88's. I think I do get a little tire spin though. Are you getting any tire spin?

I'm with Whitt, get some logs

8ALTNG

iTrader: (1)

on the dyno i made max hp at about 6400rpms. I am only running a 3.25 pulley and i race with 94 octane.

Flyer- when i was lifting the head it would pressurize the cooling system so once i let off of the throttle it would blow coolant out the overflow. and this may sound silly but what are these "logs" you guys are talking about???
thanks
matt

Flyer

iTrader: (1)

I see ... How much PSI are you seeing? Are you getting any belt dust around the SC pulley.

The logs are from EFIlive or ATAP. Gives you some detailed info of what all the sensors are seeing.

Do you have a boost gauge ?

zippy

sounds like it's simply in the tuning.

8ALTNG

iTrader: (1)

i am seeing 10 lbs of boost on the gauge.

GoldenVelvet

You can data log with most any scan tool. With logging you can see what the motor is doing

like knock retard, fuel trim, ignition addvance, MAF flow, injector pulse width, ect.

Flyer

iTrader: (1)

Is the boost dropping off any up top?