malloynx said:
One thought is having the manifold Extrude Hone ported. If it makes a stock 5.0 Mustang intake manifold flow really well, it has to work in this application.
found the limit of the stock exhaust manifold
- Thread starter malloynx
- Start date
Time for a new turbo I think? I don't see any simpler solutions other then getting an adapter.
I have a T3 -> CT26 adapter (with an external wastegate built in as well), and I have a Turbo Concepts 61mm Turbo and Tial 40mm wastegage bolted onto the stock manifold via this adapter. 550's and MAFT-PRO are being shipped as we speak. I'll be happy with 400hp, anything extra is just bonus.
Later on I will do FFIM, get a powerhouse or turbonetics exhaust manifold (I don't like tubular), and bolt up my turbo to one of those, or get a new turbo who knows. But to me, the stock manifold is just a stepping stone.
I have a T3 -> CT26 adapter (with an external wastegate built in as well), and I have a Turbo Concepts 61mm Turbo and Tial 40mm wastegage bolted onto the stock manifold via this adapter. 550's and MAFT-PRO are being shipped as we speak. I'll be happy with 400hp, anything extra is just bonus.
Later on I will do FFIM, get a powerhouse or turbonetics exhaust manifold (I don't like tubular), and bolt up my turbo to one of those, or get a new turbo who knows. But to me, the stock manifold is just a stepping stone.
I asked Ron a while ago about making a tubular manifold to work with the SP61 GT, and he hasn't said no yet, but I also know he is really busy. What I would want is a tubular one to replace the factory one and yet allow me to re-use all the performance parts I have already bought.
Have you looked into your wastegate? What is the base spring rate? I know with my old wastegate, with the 7psi spring, I couldnt get it to boost past 16psi... When I swapped to a TiAL with a higher spring rate, I was able to hit 30+... Now I didnt MEAN to hit 30+, lol, but I did...
Anyway, just a thought...
Anyway, just a thought...
That's exactly what we talked about tonight, Jake.
It's a 14psi spring I believe.
I wanted to shim it... but meh.
It's a 14psi spring I believe.
I wanted to shim it... but meh.
Why is everyone here so determined to keep their old equipment anyways? If it's in good working order, and especially if it has warranty on it, you'll be able to sell it for at least 70% of what you paid for it. Why try and make a square peg fit in a round hole? It's not like you'll be at a total loss if you switch setups, you may even save money actually.
Brent: a 1bar spring should be able to pull 2 bar easily... Hmmm... And he's using maft pro, right? I dunno... That would be my gues, the spring, and then the boost controller... But if he's runnin the big spring with a M/P, its hard to point that as the problem... Maybe its the small size of the wastegate? How big is it? 35mm? And Im still not a big fan of internal gates... That very well may be part of the problem...
B2D: I think it's a pride thing... To see just how far you can push it and be the man on top of the mountain to plant the flag first...
B2D: I think it's a pride thing... To see just how far you can push it and be the man on top of the mountain to plant the flag first...
I don't believe the turbo is stopping him. The turbo is out flowing his motor so the area to look at is his 1) head 2) the intake or 3) the exhaust manifold.
Mike said that he is running around town on 28 lb of boost. and holding it with no variation. Going from a stage 5 to the next larger P trim will only give him more lag. If 600 hp can be made on the stock manifold, the turbo he is using will get him there and then some. I see his bottle neck is in the head or exhaust manifold.
If you weld the wast gate shut you will still only see 24 lbs of boost on the dyno yesterday.
Greg
Lipp
Mike said that he is running around town on 28 lb of boost. and holding it with no variation. Going from a stage 5 to the next larger P trim will only give him more lag. If 600 hp can be made on the stock manifold, the turbo he is using will get him there and then some. I see his bottle neck is in the head or exhaust manifold.
If you weld the wast gate shut you will still only see 24 lbs of boost on the dyno yesterday.
Greg
Lipp
Adjuster
Supramania Contributor
I have seen a few CT based manifolds made from weld el's used to make up hand rails and other stuff like that.
Basicly very thick pipe fittings. (My elbow is made from one, and holds up to the exhaust heat just fine.)
JBL made one, and there was a MAXX version out there too IIRC.
Start with the flange to the head, and then build your ends with 90 corners, and the middle ones with "T" fittings, design your "box" to merge it all at the turbo and your good to go. (These have much larger than stock ID's so flow would not be a problem anymore.) IIRC, they are like 40mm ID, and that's larger than the stock exhaust port, about the same size as the gasket holes.
What I did on my head was port the exhaust runners to almost the same size as the gasket, and ported around the valve seats in the bowl area to clean up all the sharp edges and possible flow restrictions. I'm running 1mm larger stainless valves, and using BBC inner valve springs from Comp Cams.
I've also noticed on the dyno that with my bolt on 60-1, I could only boost 18psi. (Trent I believe was in the same boat, with similer HP and boost numbers on his old setup.) On the street, I can get 25psi.
The new setup is ebay manifold based, and will have a larger turbo like the one Mike's running, so it will be interesting to see if I get whatever boost levels I want on the dyno, or if there will be some limit again. (I'm betting there will be a limit, but it will be higher I hope.)
I have been told by a few dyno operators and other friends that they see this all the time. Guys come in and say they run 20lbs of boost on this setting out on the street, but then can't get more than 15 on the dyno. (Or whatever the numbers are, it is generally less on the dyno..) Says it's because the dyno can't accurately load the turbo/engine like moving the mass of the real car does, so it never spools up quite like the "real" movement of the car.
So here is one more thing to chew on.
With the head mods, and a very ported exhaust manifold, but still using the port matched bolt on 60-1 T04 that made 420rwhp at 18psi... guess what it made at 18psi on the stroker motor with all the goodies...?
419rwhp... LOL but I picked up over 100lbs of tourqe at the same time, so it FEELS much faster, and really is actually faster. I'm sort of curious why it does not make any more HP, and with the larger displacement, it's acting like a stock CT26, very, very fast spool, but it loses power over 5500rpm, and I can't get it to boost more than 18psi on the dyno..
Great setup for street driving, nice quick spool, and lots of tourqe, but I want more top end power, and if it costs me some low end, that's fine since the low end boosting tourqe just smokes the tires anyway.
Basicly very thick pipe fittings. (My elbow is made from one, and holds up to the exhaust heat just fine.)
JBL made one, and there was a MAXX version out there too IIRC.
Start with the flange to the head, and then build your ends with 90 corners, and the middle ones with "T" fittings, design your "box" to merge it all at the turbo and your good to go. (These have much larger than stock ID's so flow would not be a problem anymore.) IIRC, they are like 40mm ID, and that's larger than the stock exhaust port, about the same size as the gasket holes.
What I did on my head was port the exhaust runners to almost the same size as the gasket, and ported around the valve seats in the bowl area to clean up all the sharp edges and possible flow restrictions. I'm running 1mm larger stainless valves, and using BBC inner valve springs from Comp Cams.
I've also noticed on the dyno that with my bolt on 60-1, I could only boost 18psi. (Trent I believe was in the same boat, with similer HP and boost numbers on his old setup.) On the street, I can get 25psi.
The new setup is ebay manifold based, and will have a larger turbo like the one Mike's running, so it will be interesting to see if I get whatever boost levels I want on the dyno, or if there will be some limit again. (I'm betting there will be a limit, but it will be higher I hope.)
I have been told by a few dyno operators and other friends that they see this all the time. Guys come in and say they run 20lbs of boost on this setting out on the street, but then can't get more than 15 on the dyno. (Or whatever the numbers are, it is generally less on the dyno..) Says it's because the dyno can't accurately load the turbo/engine like moving the mass of the real car does, so it never spools up quite like the "real" movement of the car.
So here is one more thing to chew on.
With the head mods, and a very ported exhaust manifold, but still using the port matched bolt on 60-1 T04 that made 420rwhp at 18psi... guess what it made at 18psi on the stroker motor with all the goodies...?
419rwhp... LOL but I picked up over 100lbs of tourqe at the same time, so it FEELS much faster, and really is actually faster. I'm sort of curious why it does not make any more HP, and with the larger displacement, it's acting like a stock CT26, very, very fast spool, but it loses power over 5500rpm, and I can't get it to boost more than 18psi on the dyno..
Great setup for street driving, nice quick spool, and lots of tourqe, but I want more top end power, and if it costs me some low end, that's fine since the low end boosting tourqe just smokes the tires anyway.
congrats mike.
however, i dont nec agree that its the stock exh manifold that is the restriction. it could be other things. i agree, the stock exh manifold is restrictive, dont get me wrong. but you will not know for sure what is holding you back until you swap out a part and see what difference it makes. oftentimes tho, more than one part is changed out at once and not sure what caused what.
however, i dont nec agree that its the stock exh manifold that is the restriction. it could be other things. i agree, the stock exh manifold is restrictive, dont get me wrong. but you will not know for sure what is holding you back until you swap out a part and see what difference it makes. oftentimes tho, more than one part is changed out at once and not sure what caused what.
since your boss turbo is based on an ITS turbo, find out if you can just replace the exhaust housing with a t4 unit.
IJ. said:
anyone ever tried acid porting(as an alternative to grinding) the exhaust manifold, wouldn't be as nice as extrude honing, but would enlarge all areas. Just a thought....
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