just dyno'd precision 6262 .84 on a ported engine
#1
just dyno'd precision 6262 .84 on a ported engine
i made a post about the precision 6262 .84 asking if it is too small.
my setup is:
pineapple streetports
haltech PS1k
550 primaries, ID2000 secondaries
turblown divided manifold, older single wastegate style
tial MVR 44mm wastegate vented to atmosphere
11psi wastegate spring
3" downpipe and full 3" exhaust
well i dyno'd and tuned tonight, and when i started doing full pulls, i'd make it to about 6000rpms before the boost would shoot up to ~16psi and hit my boost cut.
anyway, it was at about 320whp at 11psi and 6000rpms.
i'll post a datalog for any of the haltech platinum guys. this run made it to 340whp before hitting the boost cut.
time to sell it for a 6766 or a s360. i'm now thinking a 1.00 or .96+ turbine housing?
my setup is:
pineapple streetports
haltech PS1k
550 primaries, ID2000 secondaries
turblown divided manifold, older single wastegate style
tial MVR 44mm wastegate vented to atmosphere
11psi wastegate spring
3" downpipe and full 3" exhaust
well i dyno'd and tuned tonight, and when i started doing full pulls, i'd make it to about 6000rpms before the boost would shoot up to ~16psi and hit my boost cut.
anyway, it was at about 320whp at 11psi and 6000rpms.
i'll post a datalog for any of the haltech platinum guys. this run made it to 340whp before hitting the boost cut.
time to sell it for a 6766 or a s360. i'm now thinking a 1.00 or .96+ turbine housing?
#2
Sounds about right for your setup. You'll probably enjoy a bigger turbine housing if your deciding to switch. Nonetheless 300whp rx7's are fun on the streets!
You'll be surprise how fast a 1.06 turbine spools on a stock ported 13b. Congrats on the dyno!
You'll be surprise how fast a 1.06 turbine spools on a stock ported 13b. Congrats on the dyno!
Last edited by abc; 05-13-13 at 10:38 PM.
#3
Original Gangster/Rotary!
iTrader: (213)
Why not correct the overboosting issue and see what the car can really do?
I absolutely would not move to something like a 6766 from what you have, that's a few steps up the chain and you won't be happy with the response IMO. Seems silly to just install another turbo before you know what the one you have can do
What are your power goals and planned boost settings?
I absolutely would not move to something like a 6766 from what you have, that's a few steps up the chain and you won't be happy with the response IMO. Seems silly to just install another turbo before you know what the one you have can do
What are your power goals and planned boost settings?
#7
Rotary Enthusiast
You will get the same problem on a 1:00 or 0.96 AR as well.
I was boost spiking to 28psi at 6000rpm with a Tial 44 on a 1:00. I went dual WG's and fixed the problem.
I was boost spiking to 28psi at 6000rpm with a Tial 44 on a 1:00. I went dual WG's and fixed the problem.
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#9
In the burnout box...
iTrader: (32)
A 44mm wastegate is sufficient if the manifold is routed properly. I wasn't the first and nobody can really claim to be, but I've had excellent results with dual wastegates for around 5 years now. It seems around 50% of companies are now offering dual wastegates standard.
Again, you should have no problem controlling boost with a single 44mm wastegate. Proper routing of the manifold is crucial for proper wastegate response. I still push dual wastegates as a standard turbo manifold option.
Again, you should have no problem controlling boost with a single 44mm wastegate. Proper routing of the manifold is crucial for proper wastegate response. I still push dual wastegates as a standard turbo manifold option.
#10
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Join Date: Sep 2011
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agreed with everyone else so far. stick with that turbo! are you using any AI? if not, fix that and turn the boost up a few more lbs when you correct the wastegate issue
#14
Back to basics
iTrader: (4)
You might want to check you wastegate lines, check for tears or rips in it. Also check the diaphragm for tears. I had this same problem a couple of months ago with my Tial V44 wastegate, it was a combo of a ripped diaphragm and a clogged pressure source line that led to the wastegate. Once I fixed those two problems my boost control was rock solid. I'm running a 6766 @ 20psi on low and 25psi on high (plan on going higher, but my clutch doesn't like it right now). I'd personally stick with your 6262 if those are your power goals as well, should have awesome spool time and still deliver the power you want.
#17
seandizzle, i had the wastegate opened up on my table about a week ago, checking the spring combination to make sure it was the 10.5psi combo before going out tuning. the diaphram was fine and everything was nice and clean and it good shape inside.
and let me rephrase the boost creep issue. the boost sits perfectly at 11psi from about 4000-6000rpms, then shoots up to my boost cut (16 psi) at 6500.
i am pretty sure the wastegate is functioning as well as it can.
and let me rephrase the boost creep issue. the boost sits perfectly at 11psi from about 4000-6000rpms, then shoots up to my boost cut (16 psi) at 6500.
i am pretty sure the wastegate is functioning as well as it can.
#19
It is not a wastegate, or turbo issue. It is a manifold issue. The wg runners are in the direction of flow, but there is a divider that runs up to the WG valve seat, blocking considerable surface area. The divider must be thick or it will blow out. This divider seperates the pulses completely before the valve opens which helps with boost response. That manifold was never intended for low boost, per the original owner's intentions.
Best solution would be to put in a 1.1 bar spring, and run it at 17psi. If that is not an option, next easiest solution would be a more restricitive exhaust system.
If one wants to run low boost you generally need our new manifold design.
Best solution would be to put in a 1.1 bar spring, and run it at 17psi. If that is not an option, next easiest solution would be a more restricitive exhaust system.
If one wants to run low boost you generally need our new manifold design.
#21
the manifold is one of turblown's earlier single wastegate manifolds, which were designed for higher boost, apparently.
elliot, thanks for the reply. i do get the feeling though that the boost will continue to shoot to infinity though, and not level off at ~17psi...
do your new design manifolds have the same turbo flange location as the one i have?
(attached pic is from previous owner)
It is not a wastegate, or turbo issue. It is a manifold issue. The wg runners are in the direction of flow, but there is a divider that runs up to the WG valve seat, blocking considerable surface area. The divider must be thick or it will blow out. This divider seperates the pulses completely before the valve opens which helps with boost response. That manifold was never intended for low boost, per the original owner's intentions.
Best solution would be to put in a 1.1 bar spring, and run it at 17psi. If that is not an option, next easiest solution would be a more restricitive exhaust system.
If one wants to run low boost you generally need our new manifold design.
Best solution would be to put in a 1.1 bar spring, and run it at 17psi. If that is not an option, next easiest solution would be a more restricitive exhaust system.
If one wants to run low boost you generally need our new manifold design.
do your new design manifolds have the same turbo flange location as the one i have?
(attached pic is from previous owner)
#22
B O R I C U A
iTrader: (14)
the manifold is one of turblown's earlier single wastegate manifolds, which were designed for higher boost, apparently.
elliot, thanks for the reply. i do get the feeling though that the boost will continue to shoot to infinity though, and not level off at ~17psi...
do your new design manifolds have the same turbo flange location as the one i have?
(attached pic is from previous owner)
elliot, thanks for the reply. i do get the feeling though that the boost will continue to shoot to infinity though, and not level off at ~17psi...
do your new design manifolds have the same turbo flange location as the one i have?
(attached pic is from previous owner)
#23
the manifold is one of turblown's earlier single wastegate manifolds, which were designed for higher boost, apparently.
elliot, thanks for the reply. i do get the feeling though that the boost will continue to shoot to infinity though, and not level off at ~17psi...
do your new design manifolds have the same turbo flange location as the one i have?
(attached pic is from previous owner)
elliot, thanks for the reply. i do get the feeling though that the boost will continue to shoot to infinity though, and not level off at ~17psi...
do your new design manifolds have the same turbo flange location as the one i have?
(attached pic is from previous owner)
I highly doubt the boost pressure would go sky high as the engine is already past peak torque, and you have the smaller turbine a/r that will restrict the engine on the top end. You arent going to get more than another 1000rpms out of that a/r.
#25
i'm thinking this is a perfectly good manifold for someone who wants to run higher boost, as it's very high quality and well made (as is everything elliot makes, apparently), so i could sell it to someone who wants to make more power.
i'd hate to hack it up.
but i need to run low boost for track days. my FD is supposed to be a weekend/track car, so i need to keep the boost/heat down, especially with this small turbine housing.
i'd hate to hack it up.
but i need to run low boost for track days. my FD is supposed to be a weekend/track car, so i need to keep the boost/heat down, especially with this small turbine housing.