Jump to content
SAU Community

Recommended Posts

The SC's capa sell are pretty inificient and work in much the same way as a turbo..

the way you want to go, is a twin screw setup, the twin screw units themselves are only $2500 from harrop, the cost is getting them mounted up, as you'll need a custom bracket setup..

Theres an s13 race car thats based out perth here with one, that makes over 400 at the treads with it, thats using a 2.3l unit, as well as there being an xr6 with a 2.3l unit bolted to the side, which is making over 600hp at the wheels, and cuts low 10's at the drags, think its down to 10.2 now, you can get a 3.3l unit which i imagine will make more than enough power for anyones demands here, and be totally linear in its power delivery..

the catch is it just takes moeny to develop a mounting kit, and also time and development to ensure it all functions as its meant to..

exactly, while you can get easier power from a turbo setup, a screw charger will give you better drivability and instant torque! you dont get that mad rush, more of a feeling of increased displacement. Excellent balance next to most of the big power turbo setups.

would like to see it done for something different!

Turbos are quick, cheap and easy. If you want a serious amount of power though, it will most likely end up a laggy pig.

Superchargers are complicated and expensive, similar top end power but a MOUNTAIN of torque and no lag. You get what you pay for.

So many guys compare a $ 300 secondhand Toyota blower to a beautiful $ 1500 ball bearing turbo, and say the blower is crap. They are right.

Now take a smokey old $ 300 secondhand turbo off a 1.5 litre engine, and compare it to a $3000 screw blower that can make 500 Hp. That proves turbos are all rubbish, right ?

If you are going to compare turbos to superchargers, start with a similar budget. The more you spend, the better it will be, no matter which you decide.

I have owned both, and like both, but for different reasons.

Anyone that thinks superchargers don't make power should realise that ALL the fastest drag race classes run superchargers.

So where are the four second top fuel turbo cars ? If it could be done, people would be doing it, and there would be new classes started for really fast turbo cars.

Edited by Warpspeed

Or you could get an Opcon Autorotor. They are available over the counter in Melbourne.

The largest has a rated flow of around 29 cubic metres of air per minute, that is 1,024 CFM, around 680 horsepower worth of air. Is that enough ?

http://www.hi-flow.com/HP7Super.htm

They also provide full boost over about a 10:1 engine speed range. How about 35 psi boost from 900 rpm to 9,000 Rpm.

Show me a turbo that is fully spooled at 900 Rpm, and does not run out of flow at 9,000 Rpm. Absolutely no contest......

Edited by Warpspeed
So where are the four second top fuel turbo cars ?  If it could be done, people would be doing it, and there would be new classes started for really fast turbo cars.

I think they spat the turbos out.

You CANT put a turbo on a top fueler. moot point. end of story.

There are two types of supercharger, and a fixed displacement type will provide boost from nowhere, but is not as efficient at top end.

Then there is the compressor bladed supercharger - same as a turbo, except that boost is proportional to rpm, not exhaust. There *is* lag, but its always the same. no boost creep, and no problems with short ramp settings on dynos

Either way, supercharger have a higher cost (in kilowatts) to run than an equivalent turbo.

better or worse? What are you after?

a supercharger (screw type) IS on my wish list... but I'm keeping the turbo.

So where are the four second top fuel turbo cars ? If it could be done, people would be doing it, and there would be new classes started for really fast turbo cars.

on the other side u have PANIC that can get from start to finish in about 5-4 secs but takes 5-4 secs to spool up :D

what about the extra heat from supercharging the intake ?

You can intercool it still, like a normal turbo setup..

basically most of the principles stay the same, your forcing more air in, same as a turbo, tuning is lsightly different, but instead of driving the air pump with exhaust gas, your driving it with the crank of the motor..

And as for drag cars, they only run for about a minute total, and really only 10 seconds tops on full noise, and aside from top fuellers which run on nitro, most cars run methonal, which runs a lot cooler than normal fuels do, if you take note a lot of cars runing methonal will actualy get condensation on the side of the blower/hats etc from the fuel..

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now


  • Similar Content

  • Latest Posts

    • Surely somebody has one in VIC. Have you asked at any shops?  Is this the yearly inspection or did you get a canary?
    • This is where I share pain with you, @Duncan. The move to change so many cooling system pieces to plastic is a killer! Plastic end tanks and a few plastic hose flanges on my car's fail after so little time.  Curious about the need for a bigger rad, is that just for long sessions in the summer or because the car generally needs more cooling?
    • So, that is it! It is a pretty expensive process with the ATF costing 50-100 per 5 litres, and a mechanic will probably charge plenty because they don't want to do it. Still, considering how dirty my fluid was at 120,000klm I think it would be worth doing more like every 80,000 to keep the trans happy, they are very expensive to replace. The job is not that hard if you have the specialist tools so you can save a bit of money and do it yourself!
    • OK, onto filling. So I don't really have any pics, but will describe the process as best I can. The USDM workshop manual also covers it from TM-285 onwards. First, make sure the drain plug (17mm) is snug. Not too tight yet because it is coming off again. Note it does have a copper washer that you could replace or anneal (heat up with a blow torch) to seal nicely. Remove the fill plug, which has an inhex (I think it was 6mm but didn't check). Then, screw in the fill fitting, making sure it has a suitable o-ring (mine came without but I think it is meant to be supplied). It is important that you only screw it in hand tight. I didn't get a good pic of it, but the fill plug leads to a tube about 70mm long inside the transmission. This sets the factory level for fluid in the trans (above the join line for the pan!) and will take about 3l to fill. You then need to connect your fluid pump to the fitting via a hose, and pump in whatever amount of fluid you removed (maybe 3 litres, in my case 7 litres). If you put in more than 3l, it will spill out when you remove the fitting, so do quickly and with a drain pan underneath. Once you have pumped in the required amount of clean ATF, you start the engine and run it for 3 minutes to let the fluid circulate. Don't run it longer and if possible check the fluid temp is under 40oC (Ecutek shows Auto Trans Fluid temp now, or you could use an infrared temp gun on the bottom of the pan). The manual stresses the bit about fluid temperature because it expands when hot an might result in an underfil. So from here, the factory manual says to do the "spill and fill" again, and I did. That is, put an oil pan under the drain plug and undo it with a 17mm spanner, then watch your expensive fluid fall back out again, you should get about 3 litres.  Then, put the drain plug back in, pump 3 litres back in through the fill plug with the fitting and pump, disconnect the fill fitting and replace the fill plug, start the car and run for another 3 minutes (making sure the temp is still under 40oC). The manual then asks for a 3rd "spill and fill" just like above. I also did that and so had put 13l in by now.  This time they want you to keep the engine running and run the transmission through R and D (I hope the wheels are still off the ground!) for a while, and allow the trans temp to get to 40oC, then engine off. Finally, back under the car and undo the fill plug to let the overfill drain out; it will stop running when fluid is at the top of the levelling tube. According to the factory, that is job done! Post that, I reconnected the fill fitting and pumped in an extra 0.5l. AMS says 1.5l overfill is safe, but I started with less to see how it goes, I will add another 1.0 litres later if I'm still not happy with the hot shifts.
    • OK, so regardless of whether you did Step 1 - Spill Step 2 - Trans pan removal Step 3 - TCM removal we are on to the clean and refill. First, have a good look at the oil pan. While you might see dirty oil and some carbony build up (I did), what you don't want to see is any metal particles on the magnets, or sparkles in the oil (thankfully not). Give it all a good clean, particularly the magnets, and put the new gasket on if you have one (or, just cross your fingers) Replacement of the Valve body (if you removed it) is the "reverse of assembly". Thread the electrical socket back up through the trans case, hold the valve body up and put in the bolts you removed, with the correct lengths in the correct locations Torque for the bolts in 8Nm only so I hope you have that torque wrench handy (it feels really loose). Plug the output speed sensor back in and clip the wiring into the 2 clips, replace the spring clip on the TCM socket and plug it back into the car loom. For the pan, the workshop manual states the following order: Again, the torque is 8Nm only.
×
×
  • Create New...