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  #31  
Old 17-10-2011, 05:40 PM
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Birdman Birdman is offline
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That is one nice looking firebird Scotty, enjoyed going over the post

Cheers
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  #32  
Old 01-02-2012, 03:21 PM
SBC-68-FIREBIRD SBC-68-FIREBIRD is offline
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A rainy day today so I finished early & got some time to take the car up to the dyno for a checkup after the intake change. Previously I had been told when I changed my exhaust pipes from 2.5" to 3" that the engine would be running lean so I went & had it checked on a dyno & it was perfect. When I changed the intake I was again told it would probably be running too lean so I had it checked today & it is still fine so it basically just had a couple of power runs. This was done at Ultra Tune in Blacktown, they have just installed a brand new Dyno Dynamics dyno so it should be fairly accurate, not that I am all that phased about dyno figures, the track time is what difference I want to see.
Anyways it made 383.2RWHP with the dual plane intake & today with the single plane it made 399.2 so an extra 16RWHP which is probably a low 20's engine HP gain

http://www.youtube.com/watch?v=SCXiq...1&feature=plcp
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1968 Firebird - 421 Chev - Turbo 400 - 5000 stall - 12 bolt 3.73 - 10.92 @ 122MPH.
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  #33  
Old 01-02-2012, 07:17 PM
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gke60 gke60 is offline
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good numbers from the little engine scott, could you not of pushed the pedal a little harder, lol
cheers
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  #34  
Old 01-02-2012, 07:22 PM
SBC-68-FIREBIRD SBC-68-FIREBIRD is offline
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good numbers from the little engine scott, could you not of pushed the pedal a little harder, lol
cheers
Thanks Graham, Playing around with timing / jets etc I am sure it would have cracked 400 but its all extra cost & I dont really like dyno's & especially dont like walking home so while it was all going well I was happy to leave it alone
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  #35  
Old 01-02-2012, 08:01 PM
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That sounds awesome.
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  #36  
Old 01-02-2012, 09:34 PM
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Originally Posted by SBC-68-FIREBIRD View Post
A rainy day today so I finished early & got some time to take the car up to the dyno for a checkup after the intake change. Previously I had been told when I changed my exhaust pipes from 2.5" to 3" that the engine would be running lean so I went & had it checked on a dyno & it was perfect. When I changed the intake I was again told it would probably be running too lean so I had it checked today & it is still fine so it basically just had a couple of power runs. This was done at Ultra Tune in Blacktown, they have just installed a brand new Dyno Dynamics dyno so it should be fairly accurate, not that I am all that phased about dyno figures, the track time is what difference I want to see.
Anyways it made 383.2RWHP with the dual plane intake & today with the single plane it made 399.2 so an extra 16RWHP which is probably a low 20's engine HP gain

http://www.youtube.com/watch?v=SCXiq...1&feature=plcp
Scott,

We have talked about is matter before . You need to get a bigger convertor or some steeper rear end gears! 121 MPH is good enough for 10's, so get to it and run that number. You know you want to .

Seriously, that is a good pickup HP wise. Did you pick up any torque? Maybe down low if possible to get out of the hole quicker. That way you are even closer to that 10 .

Greg.
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  #37  
Old 02-02-2012, 01:58 PM
SBC-68-FIREBIRD SBC-68-FIREBIRD is offline
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Thanks John.

Greg, no 411's or 5000 stall for me, its not much more than a stocker , drives like a baby as it is & I dont want to spoil that as it see's lots of street miles although a 10 would be mad. This manifold is pretty much the last of what I will be changing so whatever it does, it does. Am starting to collect bits for a new engine which will be either 414 or 421 cubes, depending on what I decide on regarding heads & this one will have a touch more HP than what it has now so it will do 10's - one day
The last two times it was on a dyno they were different dyno's & this one gave me AFR readings instead of torque readings.
Hows that engine of yours coming along ?
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Last edited by SBC-68-FIREBIRD; 02-02-2012 at 02:02 PM..
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  #38  
Old 04-05-2012, 10:47 PM
SBC-68-FIREBIRD SBC-68-FIREBIRD is offline
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Got to take the car for another run at the track with the new intake. Its an Edelbrock Super Victor. I had a few people say to me it was going to lose bottom end & with the hydraulic roller not revving real hard you wont see much improvement. It did not lose anything down low as the 60' times were exactly the same as what it ran with the dual plane. It did also run more consistent 120-121mph. If it had a solid roller & could rev real hard then it may have seen more improvement.

28th April 2012 @ WSID Test n Tune.
60' - 1.595.
330' - 4.575.
660' - 7.100 @ 97.17mph.
1000' - 9.296.
1/4 - 11.162 @ 121.64mph.

Heres a video from the track - http://www.youtube.com/watch?v=yjjQF...4&feature=plcp
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1968 Firebird - 421 Chev - Turbo 400 - 5000 stall - 12 bolt 3.73 - 10.92 @ 122MPH.

Last edited by SBC-68-FIREBIRD; 04-05-2012 at 10:54 PM..
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  #39  
Old 05-05-2012, 06:55 AM
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chevval chevval is offline
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nice vid scott....are you running cal-tracs or comp. eng. trac bars???? I bought a set of hotchkis chassis connectors off this bloke and I'm also thinking about getting the set of comp. eng. slide-a-links from him as well.
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  #40  
Old 05-05-2012, 07:20 AM
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Nice times Scott,very tough. Congrats.
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  #41  
Old 05-05-2012, 08:30 AM
SBC-68-FIREBIRD SBC-68-FIREBIRD is offline
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Thanks Guys.
When I built the car I fitted a set of JEGS subframe connectors, just the bolt in ones & they fitted perfect, was very happy with them. I done lots of reading on forums & most of the stuff I read said Caltracks were the best so I bought a set of them while I was in the US. Also if you need any info on adjusting them up to get the best out of them the guys at Calvert are very helpful. If you do go with the Caltracks there is now a set you can buy that only has one hole up the front. When I bought mine these were not available, they had two adjustment holes near the front of the spring. I was told to use the top hole only which I did but the bottom of the bracket hung down low enough to hit speed humps ( my car is lowered ) so I cut the bottom holes off mine. I have never run my car without the Caltracks but on a well prepped track I never get wheelspin off the line.
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  #42  
Old 05-05-2012, 10:27 AM
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chevval chevval is offline
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Quote:
Originally Posted by SBC-68-FIREBIRD View Post
Thanks Guys.
When I built the car I fitted a set of JEGS subframe connectors, just the bolt in ones & they fitted perfect, was very happy with them. I done lots of reading on forums & most of the stuff I read said Caltracks were the best so I bought a set of them while I was in the US. Also if you need any info on adjusting them up to get the best out of them the guys at Calvert are very helpful. If you do go with the Caltracks there is now a set you can buy that only has one hole up the front. When I bought mine these were not available, they had two adjustment holes near the front of the spring. I was told to use the top hole only which I did but the bottom of the bracket hung down low enough to hit speed humps ( my car is lowered ) so I cut the bottom holes off mine. I have never run my car without the Caltracks but on a well prepped track I never get wheelspin off the line.
cool man, thx for the info...the slide-a-links are at a fairly good price locally so I'll give em a go...after all I've nothing to lose.
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  #43  
Old 05-05-2012, 10:49 AM
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gke60 gke60 is offline
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good times, scott, getting there. you ok to run 10's up there at street meets now ? we can run 10:50 now in our old junk, keep at it, cheers.
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  #44  
Old 06-05-2012, 03:56 PM
SBC-68-FIREBIRD SBC-68-FIREBIRD is offline
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good times, scott, getting there. you ok to run 10's up there at street meets now ? we can run 10:50 now in our old junk, keep at it, cheers.
Thanks Graham,
I believe we are allowed but I still have not rang the track to ask the question as I have not got there yet Am pretty much down to just timing changes & jetting changes now for any further improvements as trying to put whatever cash comes my way into parts for new bottom end.
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  #45  
Old 01-07-2012, 10:03 PM
SBC-68-FIREBIRD SBC-68-FIREBIRD is offline
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Headed out to the track today for another run. The only change from last time was to take some timing out of the engine. Its down at about 34 degrees advance now. I did drop it to 32 degrees but it dropped 2 tenths & 2 mph so put it back up.
1st July 2012 @ WSID Test n Tune.
60' - 1.602
330' - 4.555
660' - 7.060 @ 97.85mph.
1000' - 9.236.
1/4 - 11.087 @ 121.50mph.
My 60 foot time was a bit slow on this run so I know there is still a bit more left in the old girl yet
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