Ok I want everyones opinions an thoughts
#1
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Ok since there are alot of new and old guys getting more and more interested in making great power out of our cars so lets start listing what you think is the best power upgrades for these cars??
So far this is what I think makes a good difference I think these cars are easily capable of 420 to 450 rwhp without the addition of a twin screw. Now we just need to figure out how to do so.
04-08 Gen 5 blower
crank pulley upgrade
tune
ported n polished intake manny
ported TB
things I am thinking that would help performance
weight reduction (hidden weight reduction so as to keep all stock looking appearance)
rear end gear changed 3.50 range would be great
3.5 in aluminum intake mandrel bent for better flow
larger mannys or short tube headers with high flow cats and 2.5 down pipes with xpipe all the way out through magnaflows
better designed camshafts
ported and polished heads
better intercooling system
So far this is what I think makes a good difference I think these cars are easily capable of 420 to 450 rwhp without the addition of a twin screw. Now we just need to figure out how to do so.
04-08 Gen 5 blower
crank pulley upgrade
tune
ported n polished intake manny
ported TB
things I am thinking that would help performance
weight reduction (hidden weight reduction so as to keep all stock looking appearance)
rear end gear changed 3.50 range would be great
3.5 in aluminum intake mandrel bent for better flow
larger mannys or short tube headers with high flow cats and 2.5 down pipes with xpipe all the way out through magnaflows
better designed camshafts
ported and polished heads
better intercooling system
#2
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when I had my SC rebuilt they put in the 5th gen lobes, I couldn't detect any difference but due to the SC overhaul my car was out of service for a few months. In cooperation with all of those other things it could be a noticeable improvement.
I definitely agree that the intercooler could use some help, the fact that it has pipes that share/exchange coolant with the engine is silly to me. A separate intercooler coolant system would definitely be good in my opinion.
I definitely agree that the intercooler could use some help, the fact that it has pipes that share/exchange coolant with the engine is silly to me. A separate intercooler coolant system would definitely be good in my opinion.
#3
#4
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A larger intercooler radiator would still be very useful together with an upgraded pump. Powerhouse and some other (eurotoys?) sell a bigger radiator, but it's just a thicker version of the original. There have been speculations that it restricts air flow more, and only helps as it increases the capacity of the system. A radiator with a larger surface area would be more beneficial if that is true. Would be interesting to see some numbers on this.
Another thing that should bring more power on a boosted engine is E85. It cools the air charge more than regular gas and it's more knock-resistant. This would probably need larger injectors (available from Buckhead for about $1300), but as no-one seems to have specs on the stock injectors, it's hard to say for sure.
#7
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#9
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As I am still learning these cars I am not sure how much I can add.
With the same blower on a 4.6 Ford V8 you hit a wall around 470rwhp and thats through a T56 with much less parasitic drain and through a dedicated intercooling system that is MUCH more efficient compared to the Jags and can keep IATs at ambient or lower. That is also spooling the blower to 13-14 PSI.
E85 is an idea but wont help enough IMHO. Again in the Mustang world there are people that use it on the twin screw upgrades. With the twin screw, tune and fuel upgrades only they can make over 700 RWHP on E85. If it were pump gas they would melt the 7&8 pistons. LOL
With the same blower on a 4.6 Ford V8 you hit a wall around 470rwhp and thats through a T56 with much less parasitic drain and through a dedicated intercooling system that is MUCH more efficient compared to the Jags and can keep IATs at ambient or lower. That is also spooling the blower to 13-14 PSI.
E85 is an idea but wont help enough IMHO. Again in the Mustang world there are people that use it on the twin screw upgrades. With the twin screw, tune and fuel upgrades only they can make over 700 RWHP on E85. If it were pump gas they would melt the 7&8 pistons. LOL
#10
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That's right, the XJR has the better transmission. I didn't think these motors could push much more than 400hp. How much does it cost to achieve 450hp in these, $8k?
#11
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At the wheels..... well thats a different story. $8000 is prolly close cause you need to port and polish and change to the newer blower etc etc.
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mechelement (06-01-2012)
#12
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450 at the crank or wheels? At the crank it should just take a tune, pulley, exhaust and maybe an intake although the stock air box does not look very restrictive. All that will run you $1000-$1500.
At the wheels..... well thats a different story. $8000 is prolly close cause you need to port and polish and change to the newer blower etc etc.
At the wheels..... well thats a different story. $8000 is prolly close cause you need to port and polish and change to the newer blower etc etc.
#14
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#16
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First tuning, then supercharger, then 2011 powertrain. Why wouldn't you just perform a friggin LS swap and have access to power upgrades at your fingertips for a fraction of the cost? I would think the ZF trans would self destruct and our motors would melt at 450hp. Lol.
#17
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I heard tht the intake system sucks and if my buddy gets free we are making a nice mandrel 3in or 3.5in system all the way and then since I relocated the window washer the filter would be perfect right behind the headlights. We will also make a heat shield and seal it to the hood with a very large cone filter.
#18
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I heard tht the intake system sucks and if my buddy gets free we are making a nice mandrel 3in or 3.5in system all the way and then since I relocated the window washer the filter would be perfect right behind the headlights. We will also make a heat shield and seal it to the hood with a very large cone filter.
Exactly what I did:
![](http://i50.tinypic.com/2wdc7xf.jpg)
#19
#20
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Also I look at the cars online where they have upper and lower pulleys, ported Eaton and exhaust and they are all only doing 355-380 rwhp. Now that seems to be on a stock tune so I guess on a cool day with low humidity and a tune that 420ish seems obtainable with the porting work you have done. Eeking out that last 40 hp is always the hardest. LOL