xirforever
New Member
It doesnt look like that engine is in any Lexus vehicle, so im guessing his cableing issue will be different than yours, my guess is that you would have to lengthen the throttle cable and maybe another one. just my 0.02
As I look at your supercharger system, I'm wondering if the very top pulley, which is under the top radiator hose that you're using is stock. Does the pulley's teeth cut the belt's outer side? How long have you've been using this setup? Do you think it's possible to replace that pulley by another smooth pulley bearing?Cobra said:
How did you machine the ribs off the pulley? What tool did you use?Cobra said:I machined the ribs off the pulley.
Do you think it's possible not to use the bypass valve in supercharging the 1UZ-FE? Will it harm anything? It's because I find it difficult to fit the bypass valve section while retaining the factory throtle body position. I hope the best fitment would be without the bypass valve so that the supercharger itself is shorter. Thanks.quadcam boat said:Yeah,
after the throttle body but before the supercharger. That way the accessories you are relocating will have vacuum at idol and atmospheric pressure at wide open throttle (which would be full boost into the engine). This would be the same situation as before you fit the supercharger - vacuum at idol and atmospheric pressure at WOT for these accessories.
It would be a good idea to refit the idol control as it is a great thing. Things like the crankcase breather can be deleted and replaced with an oil catch can, which has some advantages, but may give you some dramas for a roadworthy certificate of emissions testing.
You would put your blow off valve after the supercharger and before the air enters the engine (of course!!), but I'm not sure why you would want to fit a blow off valve??
To regulate the boost pressure on a positive displacement supercharger, just change the pulley sizes untill you get the boost you want. You don't need a blow off valve.
I'm not a turbo freak, buit I think they are intended for turbo setups to allow excess boost to vent as you back off the throttle (especially during gear changes). By venting the excess air, the turbo dosen't loose it's rotational speed and is spinning fast enough to have boost come on quicker when you plant your foot again after changing gears.
I have heard of some people have used them on cyntrifugal supercharger setups so they can run a higher drive ratio and bring on boost in the lower RPM range.
At higher RPM, the high drive ratio creates too much boost, so the blow off valve vents excess pressure to regulate the boost to a level that the engine can handle.
A bit of a waste really, because the supercharger is drawing excess power to make the boost and then it is being wasted as the excess boost is being bled off anyway. This is the tradeoff to get a cyntrifugal to create boost in the lower RPM range.
The only other reason to fit a blow off valve is for 'wank' factor.
Today after I had the measurement of the Eaton M90, I found it difficult to fit the supercharger with its bypass valve while retaining the factory throtle body position. The length of the Eaton is 19.5 inches and its height is 5.4 inches. After lining up, the bypass valve's end almost hit the firewall of the car. And the height of the supercharger wouldn't allow me to keep the factory's manifold lower part. If I screw up with the manifold without success, it will be expensive to get one. So I don't know if I can be able to proceed with it. Therefore, I'll wait to see if I need the smooth idler pulley or not. I appreciate for your consideration. Thanks.Cobra said:Just a metal lath. I have a few spare, send me your details and I will post one to you.
I'm not sure but the seller advertised it as a short snout from a GM 3.8 with the size of 19 1/2" long, 10 1/2" wide, and 5 1/4" tall.. Also, another seller with a long snout from a 1996-2002 GM 3800 gave me the size of 22" long, 10" wide, and 5 1/4" tall. These sizes just turn me off and cut my dream. And I wonder how you could do an amazing job out of them.Cobra said:What model M90 do you have?
Hello Zuffen,Zuffen said:Steve,
The Supercharger can't be bolted to the chassis.
The belt will be passing 50+hp so it needs to stay very tight. Even 1/4" movment between engine and chassis would see the belt go loose.
Lextreme sells centifugal brackets. Check out the home page.