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408 Fuel System
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clay
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Joined: 24 Nov 2002
Posts: 3209
Location: South Carolina
318129.23 points


1972 Chevrolet Nova

PostPosted: Tue Aug 26, 2014 3:46 pm    Post subject: Reply with quote

I wouldn't say it necessarily needs more cam. It's just stopped climbing at that point. Unless it just falls on it's face it'll still probably be close to a 7000 shift. AFR's definately show room for improvement. When I started with the blow through I had a great looking, flat graph. Then I tightened the converter up and everything went bad. Since I had a much wider rpm range to work in I had to do some more work. Depending on what rpm range you'll actually race in you might not be as bad as you think and actually might need to add some fuel up top. I would think the rpm range where you're still rich might either be below launch rpm or gone through so fast in low gear that it might not be a huge deal. Clay
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Paul P
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Joined: 15 Aug 2002
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Location: Townsend, Mass.
81616.60 points


1971 Chevrolet Chevelle

PostPosted: Thu Aug 28, 2014 12:44 pm    Post subject: Reply with quote

Thanks Clay for the input.

All of these were high gear pulls from 2500rpm up. Stall is at 4000. Nothing but possibly just clearing out the accel fuel added when I hit the throttle.
Paul

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2001 Focus 2.0 Zetec
stock cams, bolt-ons and tune
15.63@87 MPH 1/4mi

1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi
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Paul P
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Joined: 15 Aug 2002
Posts: 2404
Location: Townsend, Mass.
81616.60 points


1971 Chevrolet Chevelle

PostPosted: Tue Sep 09, 2014 12:04 pm    Post subject: Reply with quote

Done tuning. Could not get any more out of it at least in the mid-range. Looks like I have to find time to get to the track finally.
Burn Out

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2001 Focus 2.0 Zetec
stock cams, bolt-ons and tune
15.63@87 MPH 1/4mi

1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi
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SMOKEmUP
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Joined: 30 May 2002
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65097.54 points


1979 Chevrolet Camaro

PostPosted: Wed Sep 10, 2014 8:54 am    Post subject: Reply with quote

Let me know when you plan on heading up. I'd like to go but I have a few things to do first.
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Paul P
Member


Joined: 15 Aug 2002
Posts: 2404
Location: Townsend, Mass.
81616.60 points


1971 Chevrolet Chevelle

PostPosted: Fri Jan 02, 2015 8:22 pm    Post subject: Out for a ride on Jan 2. Not typical Reply with quote

Took the car out for a ride today. No traction but it was fun. Fuel system tune was really ugly when it is this cold. Really thinking about another alternate. Oh well still burned half a tank and had fun doing it. Salt free roads this time of year up here in the Northeast is a rarity. Happy New Year to All.
Paul

_________________
2001 Focus 2.0 Zetec
stock cams, bolt-ons and tune
15.63@87 MPH 1/4mi

1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi
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clay
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Joined: 24 Nov 2002
Posts: 3209
Location: South Carolina
318129.23 points


1972 Chevrolet Nova

PostPosted: Sun Jan 04, 2015 8:54 pm    Post subject: Reply with quote

How cold is it? No doubt you have to deal with some serious cold up there compared to me. Wonder why the Projection has such a hard time after the engine gets warmed up? I'm guessing in comparison a carburetor can respond to increased air density somewhat and maybe the older Projection system doesn't. Glad you're out riding around though. I'm sure that is a treat during the winter. Clay
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Paul P
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Joined: 15 Aug 2002
Posts: 2404
Location: Townsend, Mass.
81616.60 points


1971 Chevrolet Chevelle

PostPosted: Mon Jan 05, 2015 3:08 pm    Post subject: Reply with quote

It was in the low 30s. What I did notice that I didn't mention in the post was the engine never gets warm. It runs anywhere from 150-180 depending on how I was driving it. That had a big effect on how it ran because the primitive computer thought it was still cold and then not. The only real issue was WOT Mix up top over 6k and some lean stumble off idle. Midrange was sick. It was still a treat none the less even though traction was near non existent with the cold tires and pavement.
Smile

_________________
2001 Focus 2.0 Zetec
stock cams, bolt-ons and tune
15.63@87 MPH 1/4mi

1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi
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Paul P
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Joined: 15 Aug 2002
Posts: 2404
Location: Townsend, Mass.
81616.60 points


1971 Chevrolet Chevelle

PostPosted: Tue Jan 06, 2015 5:09 pm    Post subject: Reply with quote

Pro Systems or AED if I am going carb? Might pull the trigger on this.
_________________
2001 Focus 2.0 Zetec
stock cams, bolt-ons and tune
15.63@87 MPH 1/4mi

1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi
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clay
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Joined: 24 Nov 2002
Posts: 3209
Location: South Carolina
318129.23 points


1972 Chevrolet Nova

PostPosted: Tue Jan 06, 2015 7:41 pm    Post subject: Reply with quote

AED is the only one I've had experience with. Can't tell you about customer support because it worked very well out of the box. It was built for the application and we never changed anything. It is on a friends 408 in a Mustang. When he got the chassis ironed out and working he sorta lost interest and we never got to try jetting it. However I don't think it is very far off at all if any. CSU did my blow through any I was very happy with it. I called them a few times in the beginning and their support was excellent. I thought I had a lean issue but it turned out to be mounting location of my O2 sensor. They do naturally aspirated carbs too so I'll help add to your choices. Clay

http://csucarbs.com/1-home.html

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10sec.et
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Joined: 29 Mar 2006
Posts: 3473
Location: Houston,Texas
346658.74 points


1969 Oldsmobile Cutlass

PostPosted: Thu Jan 08, 2015 10:34 pm    Post subject: Reply with quote

ive used a couple of these. so far, i like them.

http://www.summitracing.com/parts/qft-q-850/overview/

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af2 wrote:
It seems we can look at our magical Balls and come up with a fix?

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Paul P
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Joined: 15 Aug 2002
Posts: 2404
Location: Townsend, Mass.
81616.60 points


1971 Chevrolet Chevelle

PostPosted: Sat Jul 04, 2015 10:32 am    Post subject: Reply with quote

Been driving the car a bit since traveling for my new job. I got away from the worst boss I have ever had. YES!! Now I work for a UK owned company. What difference in the way things work. Anyway back to the subject. The more I think about this now it makes sense. The car is tuned with this system but I think it is just too small CFM wise. I spoke to Tim at Bullet Cams and he said we could add some duration to it by tightening up the lash to see if it picks up which is something worth trying. The fact is he told me that the engine should be peaking 1000 rpm higher than it is. That being said makes me conclude the Pro-Jection may just be too small. It can deliver fuel ok and it doesn't go lean it just peaks early the same as if you had too small of a carb. Right now it runs great. I went back and scrapped the dyno tune and tuned it the way I did without the AFR gauge. Warms up correctly, pull hard and responds really well. Going to drive it for now but the inevitable is that it needs to be replaced as many of you have said but only because it is too small CFM wise. Just a brain dump.

I did pick up a new tach which I installed last night. Autometer Sport comp with playback and big shift light. What I did as not to hack the dash was just pull the Chevrolet plate above the heat/defrost controls and made a stainless bracket the bolted under the dash pad. Really looks sweet and i have the trans brake linked to it also for launch RPM on the shift light. See Pic the old tach is still hanging on the column in front of the Speedo. I'll be able to see the speedo now which is a bonus.


_________________
2001 Focus 2.0 Zetec
stock cams, bolt-ons and tune
15.63@87 MPH 1/4mi

1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi
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af2
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Joined: 01 Sep 2003
Posts: 5558
Location: grassvalley, ca
71227.76 points


1933 Willys Coupe

PostPosted: Tue Jul 14, 2015 7:38 pm    Post subject: Reply with quote

Paul P wrote:

2. Not enough cam sort of done at 6200.


Seriously I would be thinking spring first.....
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Paul P
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Joined: 15 Aug 2002
Posts: 2404
Location: Townsend, Mass.
81616.60 points


1971 Chevrolet Chevelle

PostPosted: Wed Jul 15, 2015 10:01 am    Post subject: Reply with quote

Done meaning power is peaking early. Still revs past that no problem with valve float. Springs are Pacaloys with only 500 miles on them. I don't think it is springs.
_________________
2001 Focus 2.0 Zetec
stock cams, bolt-ons and tune
15.63@87 MPH 1/4mi

1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi
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View user's profile Send private message
Paul P
Member


Joined: 15 Aug 2002
Posts: 2404
Location: Townsend, Mass.
81616.60 points


1971 Chevrolet Chevelle

PostPosted: Thu Jul 16, 2015 10:17 am    Post subject: Reply with quote

There is a use for the center speaker mounting tabs in the dash. Holds the tach bracket solid.


_________________
2001 Focus 2.0 Zetec
stock cams, bolt-ons and tune
15.63@87 MPH 1/4mi

1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi
Back to top
View user's profile Send private message
Paul P
Member


Joined: 15 Aug 2002
Posts: 2404
Location: Townsend, Mass.
81616.60 points


1971 Chevrolet Chevelle

PostPosted: Wed Sep 02, 2015 12:13 pm    Post subject: Reply with quote

Making the jump to EFI. Going to go with the Holley system.
I ordered the fuel pump and filters yesterday. A1000 Aeromotive pump, fittings and pre and post filters 12304 and 12301. Going to be expensive Crying or Very sad but worth it in the end Razz

I'll need to run a -10AN line up front and some small mods from the tank to the pump which will be under the car where the projection pump resides.

System and injectors will take some time to get the $$ for them.

_________________
2001 Focus 2.0 Zetec
stock cams, bolt-ons and tune
15.63@87 MPH 1/4mi

1971 - Chevelle 408 SBC N/A
6.86@102.5 MPH 1/8mi
10.78@122 MPH 1/4mi
Back to top
View user's profile Send private message
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