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| Project 3400 Roller Cam Block (Page 71/82) |
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La fiera
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FEB 14, 03:44 PM
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"My Formula daily driver also has a 3400 block but uses the stock ECM and Camaro 9.0 pistons...
It's using a ported Fiero intake (the upper I made 187/249 with) "
Lou, what you have to look is WHERE those 187 horses were made. Looking at your graph your HP peaked at 4300, then after that is coming down.
That 4300rpm limit is where your intake system starts to choke. When I say system I mean TB, Intake and cam design.
What I would do is get a bigger cam and make plenum bigger to move that 187 and even more, upper in the RPM range.
I have a upper plenum I can lend you and you can test it. It has plenty of plenum volume and nice runner length tor high hp and torque. It will stick out the decklid. But if you want to try it just pay shipping and I'll lend it to you. Its made out of a camaro intake.[This message has been edited by La fiera (edited 02-14-2017).]
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lou_dias
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FEB 14, 08:25 PM
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| quote | Originally posted by La fiera:
"My Formula daily driver also has a 3400 block but uses the stock ECM and Camaro 9.0 pistons...
It's using a ported Fiero intake (the upper I made 187/249 with) "
Lou, what you have to look is WHERE those 187 horses were made. Looking at your graph your HP peaked at 4300, then after that is coming down.
That 4300rpm limit is where your intake system starts to choke. When I say system I mean TB, Intake and cam design.
What I would do is get a bigger cam and make plenum bigger to move that 187 and even more, upper in the RPM range.
I have a upper plenum I can lend you and you can test it. It has plenty of plenum volume and nice runner length tor high hp and torque. It will stick out the decklid. But if you want to try it just pay shipping and I'll lend it to you. Its made out of a camaro intake.
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Yes - the neck was stock. Also, while the runners where ported, the gaskets were left stock and not cut to allow more air thru to match the larger ports. On page 7, I show a picture comparing the sizes of my ports to stock...
I've since DAWG-modded it and that's on my Formula now with the 57mm bore Fiero TB. On my race car, I am installing a ported 2.8 F-body intake bored to 60mm mated to my twin 42mm TB.
See how much larger my ports are:
http://www.fiero.nl/forum/F...L/075502-7.html#p264[This message has been edited by lou_dias (edited 02-14-2017).]
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lou_dias
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APR 12, 05:16 PM
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BillS
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MAY 26, 03:27 PM
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I think you'd be better off using a Camaro 3.4 intake - it flows better but it is set up for DIS so doesn't use a distributor and needs modification at te rear to clear your distributor (or fitting DIS to your engine).
Someone must have done this before. My application is an in line engine so I didn't have to deal with the location of the stock throttle body.
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lou_dias
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MAY 26, 03:57 PM
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I considered that intake but the fact that the Fiero upper intake is 2 pieces allows for porting and polishing not available on the 3.4 intake.
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lou_dias
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MAY 31, 06:08 PM
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3D printed adapter...
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La fiera
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MAY 31, 07:20 PM
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Whats the diameter on the upper intake manifold inlet?
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Blacktree
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JUN 01, 12:03 AM
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Just out of curiosity, why didn't you use a 60mm throttle body? Is there a particular reason for using the dual 42mm one instead?
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lou_dias
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JUN 01, 12:09 AM
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| quote | Originally posted by La fiera:
Whats the diameter on the upper intake manifold inlet? |
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I had it bored to about 59.x mm
@Blacktree
It's actually a dual 48mm. I got it cheap used some time ago and uses the same connectors at the Fiero harness. win-win
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Blacktree
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JUN 01, 09:20 AM
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Makes sense. That's pretty much the same reason I went with the Buick GN throttle body. The bore is 59mm, and it uses OBD-1 electronics.
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