420 rebuild thread

1slow95

Founding Member

May 16, 2002

1,797

3

48

ohio

Jul 8, 2010

#21

• Jul 8, 2010

• #21

Hey, it actually runs! I definitely need to work on the tune, it seems to be pretty rich right now. I still need to install my new wideband, I can finish that tomorrow.

YouTube - 420ci stroker first startup

 

Killercanary

The car that set the bar.

Founding Member

Nov 29, 1999

5,676

1

76

Altoona, PA

Jul 9, 2010

#22

• Jul 9, 2010

• #22

That's awesome!!! I need to re-read on how to do the EPM/LS1 coil setup. I still get timing errors and once I put a power adder on the car I know I can't afford to have them.

 

ProKiller

Founding Member

Apr 26, 2002

3,064

15

78

PA

Jul 9, 2010

#23

• Jul 9, 2010

• #23

OT: Does that mean you've made up your mind Paul and put the turbo on?!

 

1slow95

Founding Member

May 16, 2002

1,797

3

48

ohio

Jul 10, 2010

#24

• Jul 10, 2010

• #24

I tried to take it out for a drive today, but I made it 3 miles and it died at a stoplight. It barely started and I made it to a parking lot where it died again and wouldn't restart. Had to get a jump to get it going. I made a bunch of changes to the idle and startup settings in the AEM and I think it's fixed now. Gonna go try it again in a few minutes.

Another video. I think it almost sounds better than it did before.
YouTube - 420ci stroker idle and rev

 

xr8d302

I bought a 27" monitor to compensate for my lack o

Apr 29, 2004

1,113

0

36

Medicine Hat, AB

Jul 20, 2010

#25

• Jul 20, 2010

• #25

Awesome to see you're still going hard man! Looks great!

Off topic, but where in Ohio are you? The only reason I ask is because...well....I'm here....with my mustang....

I completely forgot about everything until I saw the license plates here, then I said...."holy sh$t Mike is somewhere around here"

 

nmcgrawj

Advanced Member

Sep 28, 2003

3,651

4

68

Indianapolis, IN

Jul 20, 2010

#26

• Jul 20, 2010

• #26

Where are you in ohio man? West side of the state maybe?

 

xr8d302

I bought a 27" monitor to compensate for my lack o

Apr 29, 2004

1,113

0

36

Medicine Hat, AB

Jul 20, 2010

#27

• Jul 20, 2010

• #27

Right now I'm in Geneva, which is just east of cleveland. In a few hours, I'm back on the I-80 West all the way to Montana. You're nearer to I-94 right?

 

1slow95

Founding Member

May 16, 2002

1,797

3

48

ohio

Jul 20, 2010

#28

• Jul 20, 2010

• #28

I'm on the Ohio/WV border close to I-77, but I'm in Myrtle beach this week.

 

xr8d302

I bought a 27" monitor to compensate for my lack o

Apr 29, 2004

1,113

0

36

Medicine Hat, AB

Jul 20, 2010

#29

• Jul 20, 2010

• #29

Damn you! Ah well, I'll come back.

 

1slow95

Founding Member

May 16, 2002

1,797

3

48

ohio

Aug 31, 2010

#30

• Aug 31, 2010

• #30

Didn't feel like starting a new thread....Got just over 800 miles on it, still running good. I have the tune just about figured out I think. I know it's still got a little power left in it, just not sure how much. I ran at the track a few days ago and my best run was a 12.28 @ 115 mph. That's down .4 and 5mph from my previous best run. So I'm guessing I lost about 40rwhp from the old setup. I figure I might pick up 5 or 10hp with a better tune, and maybe a few hp once it's fully broken in.

A friend of mine has a S-trim for sale. I'm thinking a couple pounds of boost for 500+rwhp should hold me over next summer while I save for a big ass turbo and fuel system.

 

BlackVert

15 Year Member

Oct 3, 2003

5,589

9

98

Bethesda, MD

Aug 31, 2010

#31

• Aug 31, 2010

• #31

what kinda compression does that monster have? boosting that beast =

did you also redo the exhaust and make it more daily drivable, so you would choose to drive it more now?

 

1slow95

Founding Member

May 16, 2002

1,797

3

48

ohio

Sep 1, 2010

#32

• Sep 1, 2010

• #32

Should be 9.5:1 now, shooting for 600-700rwhp on 8-10# eventually.

Exhaust is the same, I just lowered the compression to help driveability(and add boost). Right now it's the best it's been since I pulled out the stock engine. Only problem I have is some bucking still in the 1200-1500 rpm range, mostly on decel with no throttle.

 

1slow95

Founding Member

May 16, 2002

1,797

3

48

ohio

Sep 6, 2010

#33

• Sep 6, 2010

• #33

Ran a new best yesterday, 12.17 @ 116.5mph with a 1.92 60'. What's odd is my 1/8 was 7.91 @ 94mph, which is down only 1mph from old setup and about .10. So why would I lose 1mph in the 1/8 and 4mph in the 1/4?

I got some good videos with my cousin's camera, just waiting on him to send them to me.

 

nmcgrawj

Advanced Member

Sep 28, 2003

3,651

4

68

Indianapolis, IN

Sep 6, 2010

#34

• Sep 6, 2010

• #34

1slow95 said:

So why would I lose 1mph in the 1/8 and 4mph in the 1/4?

Click to expand...

This goes into the question i posed to Kurt in another thread about what makes a car a strong "high end" or a strong "low end" car.


I'll stay tuned...cause i think i got the explanation but im drawing a blank at the moment.

 

1slow95

Founding Member

May 16, 2002

1,797

3

48

ohio

Sep 6, 2010

#35

• Sep 6, 2010

• #35

A couple things I'm thinking of that could cause it... One is maybe my tune is still a little weak in the mid range and that's why it's not pulling as hard in 4th. I'm at 4600 rpm at the start of 4th and around 5850 at the line.

Another problem is my throttle accel pump/tip in. I have a lean spike between gears and there looks like a moment of hesitation before the car takes off. It seems to be the worst on the 3-4 shift. Once I get that fixed it may pick up a tenth, and maybe a mph or two?

Possibly the most likely situation is that I shift out of 3rd right at the 1/8 mile mark. With my old setup perhaps I was shifting before the line and the extra shift time is why my 1/8 was "only" 95. Now that my car's a little slower, maybe I'm shifting right at or just after the line and that's why I'm still seeing 94 mph.

 

Venom351R

Founding Member

Apr 27, 2002

4,548

40

98

MAINE

Sep 6, 2010

#36

• Sep 6, 2010

• #36

Get some slicks on that thing and rip an 11 second pass

 

1slow95

Founding Member

May 16, 2002

1,797

3

48

ohio

Sep 7, 2010

#37

• Sep 7, 2010

• #37

When I first started the engine I had somebody else check the timing while I set it in the AEM. I knew I should have checked it myself, but it ran ok so I assumed it was right. I just checked it tonight and it was at 14* instead of 10*. That explains why the car seemed faster when I took out timing! I had it set for 34* at WOT in the AEM so it was actually seeing 38*. I'm thinking 34-36* is probably where it'll make the best power... I know the old setup liked 34*.