Comp 268 is IN....

[truckin151]

Every once and a while yes, specially with the ac on. It never stalled but its had an issue with it yes. It went away completely though about 4months ago.

 

[cheapbeater]

why did you decide to pull the heads?

 

[truckin151]

76k on the truck si figured why not, plus it makes doing the springs 10x's easier as well as degreeing the cam and finding TDC based on cylinder 1.

 

[truckin151]

So my AFR at idle is 12.5 on startup.... hmmmm..... Lets see if the tune that reduces the fuell added to it on start up helps any to lean it out...

 

[Off_Road_Teacher]

So my AFR at idle is 12.5 on startup.... hmmmm..... Lets see if the tune that reduces the fuell added to it on start up helps any to lean it out...

Is that on a cold start or just any start?

 

[truckin151]

Any start up..

Or do I have it backwards and need to install the richer tune to make it not try to compensate for it.... guess I'll try both

 

[Off_Road_Teacher]

What's your LTFT while it is running at 12.5 A/F?

 

[truckin151]

-.3 ltft

 

[Off_Road_Teacher]

Sounds like it needs the leaner tune.

 

[truckin151]

YES IT DID!!!! It still has a slight surge so it could probably stand to have a little more pulled or just give it a little more time to learn, but it is running and running good!!!! 50 to 90 is like a blink of the eye. I have to adjust my shift points though cause they are a little off in the part throttle but it is SOOOOOOOO much better

 

[truckin151]

Oh and it hates my cutout open, makes it want to surge even more so its staying closed til the tune gets buttoned up

 

[Off_Road_Teacher]

YES IT DID!!!! It still has a slight surge so it could probably stand to have a little more pulled or just give it a little more time to learn, but it is running and running good!!!! 50 to 90 is like a blink of the eye. I have to adjust my shift points though cause they are a little off in the part throttle but it is SOOOOOOOO much better

Oh man, great to hear that it worked. Now go get us some performance numbers. I bet she flies!

 

[truckin151]

Ok got one or two more tweaks to get rid of the surging and we should be good. I really need to fix the shift points though. Right now when it shifts at 6200rpms from 1 to 2 (it feels like it could go much higher yet) it drops down to 4000rpms and feels like it clunks on the shift so I guess thats the next hurdle

 

[Off_Road_Teacher]

Bump that 1-2 shift up. I was looking at the dyno chart for that cam and it shows it still increasing hp up to 6800 rpm.

 

[talon6]

i used a 268 cam once.............it was in a toyota 22re though.lol makes it run better though. its my work transportation. probably put that motor up around 140hp.

Toyota-22R-RE-HotLicks


sorry had to say it.lol

 

[sawcut64]

Bump that 1-2 shift up. I was looking at the dyno chart for that cam and it shows it still increasing hp up to 6800 rpm.

Was that the Comp Cams dyno chart for all three cams...260/268/273? The stock intake starts to dive over much lower in the RPM band, probably more like 5700-5800 RPM's. 6300-6500 is the MAX I would set a shift, and that's just because of the shift recovery RPM.

 

[truckin151]

The highest shift I can set with the DSP is 6200rpms, I can raise the revl limiter up 7000rpms.

 

[Off_Road_Teacher]

Was that the Comp Cams dyno chart for all three cams...260/268/273? The stock intake starts to dive over much lower in the RPM band, probably more like 5700-5800 RPM's. 6300-6500 is the MAX I would set a shift, and that's just because of the shift recovery RPM.

Yes, that is from the three cam comparison.

 

[Oefootball_70]

Sweet, glad you got it figured out. Now silver just needs to get a DSP and get his thing tuned up now.

 

[Bad Habit]

sounds great ryan, you have one beast right there ill bet your qtr times will be much better....