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krawczuk
Learner
5 Posts
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 Posted - 18 Apr 2006 : 02:31:28 AM
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hi, i have a vn v6 with t70 turbo , 85 lb holley injectors, buick turbo pistons and rods, 70mm tb, ported heads and manifold, 4l60 trans , 3000 rpm stall, microtech lt8 efi ecu. and std cam,(i know, i know....) , 1.60 roller rockers. running about 18 lb boost.
does any body have any suggestions as to what specs i should be running for a suitable camshaft dura@50, lobe sep,lift etc.....
any help is appreciated,...
thanks,.
mark k
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mouce
National Driver
1525 Posts
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Posted - 18 Apr 2006 : 10:25:39 AM
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| Got no idea on what cam to run, but holy crap that thing must have some serious power at the rear wheels. What does it spin on the dyno? |
Bite off more than you can chew, and chew like hell - Peter Brock (1945-2006) |
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krawczuk
Learner
5 Posts
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Posted - 18 Apr 2006 : 4:01:17 PM
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quote:
Originally posted by mouce
Got no idea on what cam to run, but holy crap that thing must have some serious power at the rear wheels. What does it spin on the dyno?
hi, it flashed up to 350 hp at rear , then the intercooling piping blew of.
the thing is when its hitting boost you can tell there is somethin wrong , and i am pretty certain its the cam ??
mark k |
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mouce
National Driver
1525 Posts
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Posted - 18 Apr 2006 : 6:47:01 PM
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| What are the symptoms that tell you something is wrong when it's on full boost? |
Bite off more than you can chew, and chew like hell - Peter Brock (1945-2006) |
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krawczuk
Learner
5 Posts
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Posted - 18 Apr 2006 : 7:25:35 PM
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quote:
Originally posted by mouce
What are the symptoms that tell you something is wrong when it's on full boost?
hi, it starts to get going , then it just wont go any more ,and u can tell , " boy it should be going alot better than this..." its like its hitting a wall , and its making a noise which i think is the ext wastegate going off...
maybe there isnt enough lift etc.. on the cam , and its building up boost inthe manifold and setting the wastegate of early ?
mark k |
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mouce
National Driver
1525 Posts
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Posted - 18 Apr 2006 : 8:52:04 PM
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Depending on how hard you push it, and how many k's the engine has on it (though it sounds like you've done a full rebuild), you may be hitting valve bounce. I know that my valve springs aren't doing too well, and I hit valve bounce at 4600rpm. It's like hitting a wall...she pulls hard right up until then and just won't go past there too well.
Said and done though, having the 1.6:1 rockers on there should be enough to compensate for not having a custom cam in there. I mean let's face it, I can't see duration being the issue (although I could be wrong), you suggested lift, well...I reckon that 1.6 ratio roller rockers would provide enough lift (again, I could be wrong).
I know you've got uprated injectors, but what fuel pump are you running? Maybe it just can't get enough fuel into the cylinder at full boost at WOT. To be honest I don't know what the fuel pump will flow at, but that might be worth investigating.
When you had it dyno tested, did you ask anyone at the workshop what they thought? |
Bite off more than you can chew, and chew like hell - Peter Brock (1945-2006) |
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lolo
Fully Licenced
503 Posts
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Posted - 09 May 2006 : 11:25:43 PM
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Mate if u live in Melbourne head down to Bresciani in 76 Foeden drive Campbellfield n they sure will give your beast a good massage.
btw how much did u spend cos im looking at goin down that rarely trodden turbo path myself....geez u must have a good job |
Marcus Rogulic R.I.P (1980-2007)
"The Good Die Young" |
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johnny cade
On a small holiday
338 Posts
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Posted - 13 May 2006 : 4:50:12 PM
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i have a vn v6 with t70 turbo , 85 lb holley injectors, buick turbo pistons and rods, 70mm tb, ported heads and manifold, 4l60 trans , 3000 rpm stall, microtech lt8 efi ecu. and std cam,(i know, i know....) , 1.60 roller rockers. running about 18 lb boost.
lol..i have...no idea what u said..but lets go with it |
He sees an old man and says “See we’ll part with your hard,
Earned cash or rest in peace we can start with your heart.
Some girl steps not afraid she’s gonna cop it sweet,
And gets decked before she made it even on her feet,
The old man leaped to her aid and to his horror he’d,
Thrusted his chest into the blade of his robber s piece,
He grabbed the wallet, dropped the knife as he fled the car,
Concerned about the loss of life he’d never went this far,
What’s done is done, he’d got the prize and he’d spent his half,
Of two dollars in change and a pension card. |
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