Twin Scroll Turbos?? Monster Spool.. FACT or FICTION???
Unfortunately I had no choice but to get the twinscroll t4 .84 a/r for my 6466, but its going on a stock block so I wont really need to push it yet. Lets hope his spools fast and runs well.
Is it possible to spool 42psi on a t4 divided .84 housing by 4800rpm non mivec on a 2.0l?
Obviously your housing would be more ideal for potential gains, but for spool purposes what are we looking at here?
t4 divided 6466 .84
full race mani
dual 44 mvr
non mivec
2.0l (oem compression)
I feel like it is from what I see with these 1.15 housings....
[QUOTE=Ted B;10948143]
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LOL yeah I know its not ideal, but the price was. I think if I'm not revving it out or pushing 35+ lbs of boost it won't choked off, no obviously if I was a on a built block this small of a/r would be silly but lets face it the turbo on its worst day is making 600whp and that is appraching the stock blocks limitations. If anything I might spool faster and when I throw new block in a $200 hotside swap will be all the difference
[/QUOTELOL yeah I know its not ideal, but the price was. I think if I'm not revving it out or pushing 35+ lbs of boost it won't choked off, no obviously if I was a on a built block this small of a/r would be silly but lets face it the turbo on its worst day is making 600whp and that is appraching the stock blocks limitations. If anything I might spool faster and when I throw new block in a $200 hotside swap will be all the difference
The smart move is to keep torque limited to no more than 400ft/lb, and power under 550whp. That keeps the forces of stress and heat somewhat in check, especially in the higher gears. And while there are zero guarantees by any stretch of the imagination, if you are fortunate, you won't have to add a block, crank, and possibly a head to your shopping list.
As the old saying goes, an ounce of prevention is worth a pound of cure, and we've seen plenty of a need for stock block 'cure' here over the years.
FYI, that's about 50whp more than what becomes particularly risky with a stock block, especially if one is dealing with a higher mileage, tired block.
The smart move is to keep torque limited to no more than 400ft/lb, and pow
er under 550whp. That keeps the forces of stress and heat somewhat in check, especially in the higher gears. And while there are zero guarantees by any stretch of the imagination, if you are fortunate, you won't have to add a block, crank, and possibly a head to your shopping list.
As the old saying goes, an ounce of prevention is worth a pound of cure, and we've seen plenty of a need for stock block 'cure' here over the years.
The smart move is to keep torque limited to no more than 400ft/lb, and pow
er under 550whp. That keeps the forces of stress and heat somewhat in check, especially in the higher gears. And while there are zero guarantees by any stretch of the imagination, if you are fortunate, you won't have to add a block, crank, and possibly a head to your shopping list. As the old saying goes, an ounce of prevention is worth a pound of cure, and we've seen plenty of a need for stock block 'cure' here over the years.
I had a PT&E rebuild fail on me at 22#,; as soon as I bolted it up. But, mine may have been the exceotion to the rule. This is not to say that Harry Hruska is totally inept. He probably doesn't personally do every turbo that leaves his shop.
The backpressure would be out of hand before that would be possible. Twin scroll loves larger housings. I will get the dyno graph up tomorrow as I was going from memory...some error may have crept in.
Aaron
Aaron
Is it possible to spool 42psi on a t4 divided .84 housing by 4800rpm non mivec on a 2.0l?
Obviously your housing would be more ideal for potential gains, but for spool purposes what are we looking at here?
t4 divided 6466 .84
full race mani
dual 44 mvr
non mivec
2.0l (oem compression)
I feel like it is from what I see with these 1.15 housings....
Obviously your housing would be more ideal for potential gains, but for spool purposes what are we looking at here?
t4 divided 6466 .84
full race mani
dual 44 mvr
non mivec
2.0l (oem compression)
I feel like it is from what I see with these 1.15 housings....
This year I am on the same setup but with a larger runner manifold VS the small runner I had. Soon I'll see some results. I may even try the 1.32 housing
Last edited by EvoDan2004; Sep 6, 2013 at 09:29 AM.
Probably depends on the application. Seems like the 7670 reaches it's airflow limit by like 30psi on a 2.0L 4G63. Going to a larger A/R is likely to just lose spool and do little for power.
Maybe on a larger displacement engine running lower boost it would be a nice housing but it seems to big for the 4G63 that loves the higher boost pressures. I could see twin 7670s being pretty nasty with big housings on something like an LS1 running crap fuel.
Maybe on a larger displacement engine running lower boost it would be a nice housing but it seems to big for the 4G63 that loves the higher boost pressures. I could see twin 7670s being pretty nasty with big housings on something like an LS1 running crap fuel.
FYI, that's about 50whp more than what becomes particularly risky with a stock block, especially if one is dealing with a higher mileage, tired block.
The smart move is to keep torque limited to no more than 400ft/lb, and power under 550whp. That keeps the forces of stress and heat somewhat in check, especially in the higher gears. And while there are zero guarantees by any stretch of the imagination, if you are fortunate, you won't have to add a block, crank, and possibly a head to your shopping list.
As the old saying goes, an ounce of prevention is worth a pound of cure, and we've seen plenty of a need for stock block 'cure' here over the years.
The smart move is to keep torque limited to no more than 400ft/lb, and power under 550whp. That keeps the forces of stress and heat somewhat in check, especially in the higher gears. And while there are zero guarantees by any stretch of the imagination, if you are fortunate, you won't have to add a block, crank, and possibly a head to your shopping list.
As the old saying goes, an ounce of prevention is worth a pound of cure, and we've seen plenty of a need for stock block 'cure' here over the years.
Yes back pressure is going to be the enemy with this small hosing, and like I've stated I wanted the magical 1.15 because I'm sure it would be more power everywhere BUT lets hope that what I will lack in additional power(not that I will benifit from it on this block) I will pick up in spool. Logically the smaller a/r should do SOMETHING better. If it doesn't...well that's an easy decision when the time comes.