makes a lot of sense when you read it through. when i can finally afford to do these little things that im planning i will definetly give this a go. money is a big problem. thanks again guys. its good to hear the oppinions and experience from other people. Daniel.

Yes indeed, we all could use more money. But the car can be gradually improved and upgraded and kept on the road. The main thing is to think ahead and have a plan. Stocky has been working on his for three years, and with some fairly spectacular results. Matty too has been at this a long time. It is all great fun and very instructive. A unique and superior car that you built up yourself is something to be really proud of.

will having an intercooler make a big difference. i will be running the tb in the stock place with the bypass system you guys were talkin about but with no cooler for now. so would it make a big difference? thanks in advance guys Some original photos have not been recovered yet.

Yes, it will. You will get lag but.. people think SC = no lag.. you do get lag, but its only like .5 of a second MAX, You can feel it, But only when your driving. it will make alot of differance. i have been behind the controlls of both intercooled and non cooled, for the price of coolers off Ebay and how good they work is it really an option not too?

ok thanks. i will hopefully get one when its back on the road. cheers

It depends on how much boost you plan to run, and the time of year, as well as where you are (climate). Hot less dense air really defeats the purpose of supercharging. But if you are running very low boost in Hobart in a frosty mid winter night at 3Am, An intercooler is probably not going to be a huge advantage . But High boost in a Darwin summer in the middle of the day, would make a vast difference to power and response. There is no simple answer.

But are you only going to drive your car at 3am mid winter?

well i dont live in hobart or darwin so that make it easy. ill get one adventually.well im not going to be changing pulleys every morning to suit the weather. ill be running bout 4psi..

changing pullys isnt an easy job.. If you have an SC14 supercharger (i dont know what your running) Its fun changing one.. And new pullys are so over priced.. I got one made for 1/6000 of what a new one is..

yeah ive got an sc14. how much was the new pulley and how puch psi was it for.

would a plumbback bov plumbing back to the inlet of the charger work instead of wastegate?

No it will not. Although on the surface it appears that a BOV works in exactly the same way as a wastegate, the difference is that a BOV opens and closes suddenly and extremely violently. A wastegate will open and closes quite smoothly with gradual pressure changes working against the spring, and can remain partly open anywhere in it's operating range. The wastegate opening follows the position of your right foot precisely and instantly, just as the pointer on a vacuum gauge does. A BOV would suddenly snap open and snap shut at two definite throttle settings. On or off like a light switch, so there would be sudden jerks and surges, and would feel really horrible to drive. With a properly set up wastegate bypass (correct spring selection), boost comes in so very smoothly. Without a boost gauge, it is impossible to feel exactly where boost begins, it will be so beautifully smooth to drive. The spring selection sets at what throttle opening boost starts to climb, and how fast it comes in. So you can play around a fair bit with how the car feels to drive, and your own personal preference.

nishmix i think you'll find you'll regret swapping a N/A intake for a Turbo intake. the N/A manifold is actually better and alot of Turbo boys actually run it instead of a the turbo one you get lot more air flow and torque with the N/A manifold.

Quote: Originally Posted by Fischer would a plumbback bov plumbing back to the inlet of the charger work instead of wastegate? where does the wastegate some into it? But Yeah can get a plumb-back bov to work as a re-curculation valve, you just have it set with a weaker spring so that it is open, and re-curculating whenever the engine is under vaccum. say idle and crusing.

Try a using a blowoff valve on your supercharger for yourself then, and see. After you have frigged around with it for three months, and it still does not work properly, try fitting an external wastegate modified with a weaker spring. It will work perfectly. We have all tried this, and IT DOES NOT WORK. But go ahead and discover that for yourself. Learning is a great experience.

A wastegate is better, i didn't mean to argue against that. just that julian edgar guy used a bov to this effect, and he's a very smart man, i know it was on a different car, but the principles are the same... I guess what works on a supercharged toyota prius doesn't allways work on a supercharged vl.

In theory a blowoff valve should work, after all it works in an identical manner, but for several practical reasons it would not be a good choice. The biggest objection is probably the air passages inside a blowoff valve are quite small. It only has to blow off excess boost, not all of the boost. So for getting rid of a really high boost spike it will work fine with a small exit hole. That is why they are usually so noisy, only a small exit area. A supercharger bypass needs to bypass ALL the air that the supercharger is pumping, and do it with a very low a pressure drop. If the bypass is restrictive, the supercharger will not be completely unloaded during light throttle running, and it defeats the main purpose of fitting a bypass. The second problem is that the control diapragm really needs two ports so it sees the pressure drop across the throttle body. Many blowoff valves don't have that second port fitted, so it will need some modification. The third problem is the spring. Some blowoff valves are fixed and sealed. There is no way to take it apart and get it back together. The adjustable ones may not be able to be adjusted low enough, and if you cannot take it apart to change the spring you are stuffed. I am sure there are some blowoff valves out there that may be possible to use, but I doubt if they would be the cheap ones. But an external wastegate is absolutely ideal for the job, the only problem being the suitability of the original spring. So I agree, a blowoff valve might be made to work, or it may not, depending on what you actually have to work with. I still don't know anyone that has been happy with the results of trying this. But if you already have a spare blowoff valve out in the shed, give it a try. But if you have to go out and buy something, an external wastegate is the much better solution.

Quote: Originally Posted by monaro327 nishmix i think you'll find you'll regret swapping a N/A intake for a Turbo intake. the N/A manifold is actually better and alot of Turbo boys actually run it instead of a the turbo one you get lot more air flow and torque with the N/A manifold. yer im a bit undecided on this, was thinking about just using the injectors and fuel rail on what i have.

Yeah the turbo manifold is designed for turbos to help reduce turbo lag for 1 you have a super charger so this isn't an issue and 2 it doesn't work how it was intended cause most turbo duddes use the N/A manifold as a cheap upgrade anyway. you can just look at them and see that the N/A manifold is better design and easily flows more air...

hey guys can i get some pics up of your bypass valves? and some instructions on how to make it thanks. going to get onto this soon.