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| 250 WHP Supernatural 3.4 Build (Page 14/47) |
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La fiera
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DEC 02, 12:21 PM
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| quote | Originally posted by unboundmo:
...and I "have" to say it's a 2.8L... Cali laws 😏 |
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Nothing wrong with the 2.8. I don't know if yo know but before my 3.4 I had a wicked 2.8. Check this out:
https://youtu.be/dayXz0arXZ0
In action
https://youtu.be/apPx7Tu3Q9E?t=4m47s[This message has been edited by La fiera (edited 12-02-2017).]
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unboundmo
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DEC 03, 01:22 AM
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I really like the crackle sounds..especially in the supernatural video.. the warm up... were you running a muffler at the time?.. and is it with a catalytic?
Definitely cammed!.. is that a 272 or 260 range? Did you have the full roller rockers too like I saw on the 3.4L?.. interchangeable to both engines of course... curious if the 272 lift was able to mesh with the 1.6 ratio?.. if that's what you have.. I've read that it's too extreme).. I like the 1.6L with the 260 myself.......
What fuel pump are you running?.. mine just went out--AGAIN.. number 2 from Walbro-junk 255. Does yours not reach the full pressure on the 1st turn of the key?.. speaking the supernatural video.. I noticed you turned off and on again the switch
.... you stripped your interior for weight also.. I wonder what the technical weight difference is?....
I love our cars.. cool little racecar for its class.... and yes, this is my go-cart too 😬... just sayin
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So what's next in your plans with this 3.4L??.... and the rest of the car[This message has been edited by unboundmo (edited 12-03-2017).]
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unboundmo
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DEC 03, 02:02 AM
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I hope you don't mind.. this video is cool too
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La fiera
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DEC 03, 08:41 AM
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The 260 and 272 cams are smaller than the one my 2.8. The 260 is 204int/216ext duration @.050 and the 272 is 216int/228ext duration @ .050.
The cam on my was 230 @ .050 with .512 lift on 1.6 roller tip rockers. But the heads on the 2.8 as well as the 3.4 are machined to take adventage of the plethora of valve springs of the Small Block Chevy. You must use good springs with big cams[This message has been edited by La fiera (edited 12-03-2017).]
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La fiera
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DEC 03, 07:00 PM
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| quote | Originally posted by unboundmo:
What fuel pump are you running?
So what's next in your plans with this 3.4L??.... and the rest of the car
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I was using the stock fuel pump and noticed it had a hard time keeping up with the AFR so I upgraded to a 340GLH. After installment I had to re adjust the fuel pressure. Now the gauge on the regulator is steady, before it was bouncing up and down and the AFR's are steady.
I'm building this car for Time Trials so the next thing will be smoothing out the body for better aero. I want to make it flat bottom. I'm also working on another Supernatural short block to get 300whp with the iron heads that I'd rather not say the displacement because I can already hear all the negativity and harassment, so I'll just do it and show it after its done. Mean time I'll just use the winter months to fine tune this engine and start testing by March.
My motto is "If you didn't try, you've failed because failure is the beginning of success"
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La fiera
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DEC 03, 07:32 PM
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Today I took a break from the Fiero and installed an upgrade on my '83 Porsche 944, I love driving this sucker!! 128WHP and I can be on the bumper of a Vette through the twisties!!
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pmbrunelle
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DEC 03, 07:36 PM
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| quote | Originally posted by La fiera:
I was using the stock fuel pump and noticed it had a hard time keeping up with the AFR so I upgraded to a 340GLH. After installment I had to re adjust the fuel pressure. Now the gauge on the regulator is steady, before it was bouncing up and down and the AFR's are steady.
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Did someone check the pressure during a WOT run on a dyno?
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La fiera
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DEC 03, 07:52 PM
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| quote | Originally posted by pmbrunelle:
Did someone check the pressure during a WOT run on a dyno? |
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The dyno runs were very erratic without any changes on the software. I could keep my eyes glued to the AFRs and it would oscillate way out of proportion. And yes, I also had someone look at the fuel pressure regulator gauge and he said it bounced so bad he couldn't keep up with it. After the pump was replaced the AFR's and gauge pressure are steady. I don't take chances when I'm on the dyno so I always run dynos on 112 octane in case something goes wrong. I didn't do that with the previous build and it twisted a rod. After that I always run 112. After everything checks out good then I go to 93 octane. My compression is 10.8:1[This message has been edited by La fiera (edited 12-03-2017).]
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La fiera
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DEC 03, 08:18 PM
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Look closely.
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unboundmo
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DEC 04, 03:25 PM
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| quote | Originally posted by La fiera:
The dyno runs were very erratic without any changes on the software. I could keep my eyes glued to the AFRs and it would oscillate way out of proportion. And yes, I also had someone look at the fuel pressure regulator gauge and he said it bounced so bad he couldn't keep up with it. After the pump was replaced the AFR's and gauge pressure are steady. I don't take chances when I'm on the dyno so I always run dynos on 112 octane in case something goes wrong. I didn't do that with the previous build and it twisted a rod. After that I always run 112. After everything checks out good then I go to 93 octane. My compression is 10.8:1
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Am I wrong that when talking about octane ---- 87 - 112.... the higher the number, the more delayed in explosion?... not sure if my Dad was right but he always said the higher, the more junk is in the gas to delay the explosion.... so it would be a timing thing to fine tune a certain octane to a certain timing for maximum efficiency?... higher octane, the less advance the timing?
I run 91 with my built Fiero - set at 10*.. but I use 87 for my stock jEEP.. stock ecm setting.. whatever that is
****Can someone explain this?---- no guessing!****
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