pros and cons for 20b or v8

[turbo boy]

Some luck has finally come my way and i start my new better paid job next week after having a pretty "average year".
I`ve got most of my single turbo parts and will continue doing that throughout the winter, when its done it will have around 450hp to keep it reliable. If i get a whole year of driving it without any problems i will sell off the engine.
 
As soon as the single turbo conversion is complete im gonna start saving for an ls3 engine straight from the corvette factory.
 The cost of the engine is £6000
                   t56 gearbox £2000
              diff and subframe, kit £2500
                    ancilleries   £1500
Remember this engine will be completly standard and still push out 500hp and 500lb torque whilst doing 30mpg. I didnt want it to come to this but having the car for 6 yrs and only driving it for 1 of those yrs i have had to re-think my future plans for my car. Seem to spend more time with my head under the bonnet than driving the thing!
 
How much would a 20b cost to build with the same power?
I was looking at prices for billet rotors and upgraded seals... ridiculous!
 I really like the sound of 20bs too, oh well

[tinker-27]

A ls3 is not 500 std , and you don\'t want a corvette spec one , I wouldn\'t buy new as you can get a pull out for a lot less , they don\'t really go wrong so silly to pay through the nose . You would be better not using the t56 if you have the choice , a ls3 will be fantastic in it but do your research as it may same you a fortune in time and money !!

[turbo boy]

I think their 470 so a tubular manifold and remap should get me 500. Which gearbox is best for this conversion?

[tinker-27]

It depends on what Dyno you use as they all read different set they are about 400@ wheels and very smooth and bags of torque , they work very well with a cam to make them breath better , use a tr 6060 if you can

[turbo boy]

Sweet, yeah ive heard of them boxes. You fancy doing the conversion next winter?:god

[Mir]

There is nothing better than 20b. But if you really want V8, then use tinker27\'s services. His work is good.
 
But, I would still say, ignore V8 and buy 20b.
 
Depends on your goals but roughly,
 
2500 Engine RX Motors ask for Tim
Roughly 3500 Rebuild by WGT/Hayward/Powergains/OLDONE Racing
1000 porting and Injectors along with Fuel pump and bits
1500 ECU
 
Job done and you could have a reliable and FASTER car. I know, I may have missed something but that is still a better option
 
Cheers

[Grant Monkhouse]

20B= £20,000. Simples. Lol.

If you were to do a 20B you got to get some beefy bridge ports in it to give it that sound. Gt42/45 turbo at 1bar would probably give 650Fwhp.

I would have the 20B over the v8 but if your wanting your fuel to take you further, then a ported 20B is not the sensible solution.

[Mir]

20B= £20,000. Simples. Lol.
 
If you were to do a 20B you got to get some beefy bridge ports in it to give it that sound. Gt42/45 turbo at 1bar would probably give 650Fwhp.

Grant I am sure you saw the Dyno Sheet of my FD. I made 520FWHp on a Street Ported Engine. So, with a bridge port and GT42 OR 45 Turbo you are looking 750FWHP at only about 10 Bar a Boost!! "Roughly"
 
Mir

[lee mills]

Grant I am sure you saw the Dyno Sheet of my FD. I made 520FWHp on a Street Ported Engine. So, with a bridge port and GT42 OR 45 Turbo you are looking 750FWHP at only about 10 Bar a Boost!! "Roughly"
 
Mir

750fwhp @ 10 bar of boost:eek::Giggle:rolleyes::rolleyes:
would want a lot more than that for the 2 seconds the engine would last:Thumbsup!:Giggle:Giggle

[bimbleuk]

If I was to convert my RX again I would either go with an LSx V8 and a 5 speed box as the T56 has too many niggles and ends up with either 1st or 6th being practically redundant.
 
However from some recent experience on another conversion project I\'d now use the Jag/Mazda 3.0 AJV6. Cheap supply of engines. The 5 speed manual on them is tiny though much harder to find. The bottom end is able to withstand very high RPM and only needs a cam and throttle bodies to get 320-340 BHP.

[re japi]

You cant ignore weight differense. If you are building track car, v8 is far too heavy. And it effects Fd´s axle weight, it wont be 50/50.

[Grant Monkhouse]

Grant I am sure you saw the Dyno Sheet of my FD. I made 520FWHp on a Street Ported Engine. So, with a bridge port and GT42 OR 45 Turbo you are looking 750FWHP at only about 10 Bar a Boost!! "Roughly"
 
Mir

Well yes but I was giving the lower amount so that people would be surprised at the HP they would actually get.

650 would be a good number to start with

[bimbleuk]

You cant ignore weight differense. If you are building track car, v8 is far too heavy. And it effects Fd´s axle weight, it wont be 50/50.

You\'re right I\'ve only managed 51/49 F/R so I\'ve failed miserably
 
I won\'t argue that a rotary will always that little bit lighter like for like but it\'s possibly not as much as many people think.

[Grant Monkhouse]

A 20b turbo will probably be heavier then a v8 me thinks?

Weight distribution can be made better by some firewall chopping.

[tinker-27]

Craig win had a 20b (kermit) and a v8 at the same time and the v8 was quicker round the track ! , I\'m not saying the 20b is not any good because it is , I drove it and it was very fast . They make two different types of cars , and the 20b used about three times the fuel I kid you not !!! He turned up to the first shake down run a donnington with a full tank and four jerry cans , which is what his 13b would have used in a full day on the track , he sent home with three jerry cans full , I would look into both options and have a drive in both and make your own mind up don\'t take people\'s word for it as most don\'t really know what they are talking about ,even with v8s there are lots of options kits/people who do them , same as 20b conversions try to get a all done price as there are things that need doing to make it right . With a v8 you are fitting all new ( 2006>) stuff , what gear box would you run with a 20b as a std box won\'t last long ? . We all think our way is the best just find the best choice for you and your pocket  .