Thursday, February 21, 2008 - 11:50 pm, by: Kim Hunt(Lxtasi)
i have a uzz31 that i have recently supercharged. i have a 2.4inch (approx) pulley which is meant to produce 10PSI. my problem is that the supercharger is only putting out 7-8PSI. i have no leaks that i have found and the intake piping to the intercooler is very short because it is all under the bonnet. so i'm wondering if anyone has any ideas for why my setup isn't producing the right boost. hope fully Gary Nimmo can help me out for i had my kit made by Joel Alexander just like his.I'm also wondering if Joel's canculations on a 55mm-60mm pulley to make 10PSI was using my crank pulley size and not a variant motor's. i have the 91 model uzz31.
Friday, February 22, 2008 - 12:13 am, by: Daniel Clarke(Dieseltrain)
Could possibly be that Kim... Maybe get him to make another pulley on the current calculations from the Pulley thats on the car now and see if it makes 10psi?
Andrew Ferres DieHard WA '90 C-F Celsior V8, '84 Soarer V8, '91 Supra V8
Friday, February 22, 2008 - 11:55 am, by: Cihan Aday(Cihan)
Its a positive displacement supercharger, it moves a set amount of air. Everyone running a 1UZFE + 2.4" pulley should make similar power irrespective of other modifications (a little more if intercooled).
Boost has little to do with it ie. If your motor is breathing well and the engine bay is cool, the blower will make less boost (but slightly more power).
The idiots running modified M90's (on v6sc.com) to push 18-22psi are overspeeding the charger to the point where its so out of efficiency the intake charge is expanded enough to double in pressure (basic gas law). As such they're only making 230rwkw or so (up from 200 @ 10psi).
Friday, February 22, 2008 - 10:12 pm, by: Kim Hunt(Lxtasi)
yes i was using that boost chart an yes my air in the engine is always cool due to the W2A intercooler. but as i said it only peaks at 7PSI and i actually think that the boost dies down at high rpms but i will have to confirm this. i'm trying to get Joel to make me a smaller pulley so i can swap it on and off for power cruise which i have entered so yeh. any more suggestions? thanks guys
Friday, February 22, 2008 - 10:19 pm, by: Daniel Clarke(Dieseltrain)
How restrictive is the exhaust system? What kind of headers and what kind of Catalyctic Convertors and mufflers? What pipe sizes? What Intake? Pod filter or BFI box?
Friday, February 22, 2008 - 10:58 pm, by: Kim Hunt(Lxtasi)
ok from the cat back there is 2 1/2" dual pipes that merge into a custom x pipe then to 2 stainless steel mufflers. the intake has no (i forget the name but its the box that stops the intake noise), after the AFM or MAM what ever the one it is is a quite large Drift brand filter. the intake pipe is roughly standard length. hope that helps
Saturday, February 23, 2008 - 06:23 am, by: Daniel Clarke(Dieseltrain)
COuld be the factory headers and stock cats that are holding you back ? Definately invest in some of Neil's Extractors and some high flow cats, this should help some.
Saturday, February 23, 2008 - 11:42 am, by: Kim Hunt(Lxtasi)
yeh thats what i was planning to do but i still thought that the blower would put out 10PSI and that the exhaust wouldn't effect it tooo much. has anyone else found that - the pulley wasn't the right size for their boost application?
Saturday, February 23, 2008 - 03:54 pm, by: Kim Hunt(Lxtasi)
well the exhaust thing i think should be ruled out because unlike a turbo the blower doesn't rely on the exhaust gases speed and flow. how would i know if the belt is slipping? just wear on the belt? black dust near pulley? how much is a gator back belt?and where can i buy it from?
Saturday, February 23, 2008 - 05:20 pm, by: Daniel Clarke(Dieseltrain)
If the Exhaust is restrictive, It wont get all the gasses out fast enough, so wont be able to produce as much to go in as there is still some of the old stuff hanging around in the chamber?
Andrew Ferres DieHard WA '90 C-F Celsior V8, '84 Soarer V8, '91 Supra V8
Saturday, February 23, 2008 - 07:45 pm, by: Kim Hunt(Lxtasi)
so what your saying is that my motor breaths tooo well. any ways i do think that the belt is slipping. i have rubber dust near the pulley, the boost will peak at 8 when throttle opened but will hang around at 7 and i split a belt today so i think it was cause by the belt slipping. any help on how to fix. i have till thursday cause i'm going in powercruise. thanks
Andrew Ferres DieHard WA '90 C-F Celsior V8, '84 Soarer V8, '91 Supra V8
Sunday, February 24, 2008 - 12:13 am, by: Kim Hunt(Lxtasi)
oh no squeeling but a bit of rubber dust is pressent. where can i get a gator back belt? and does the sugar just make it sticky?what would be causing my belt to half pop off and end up slipping? so the only reason that i can think of that isnt eliminated is that cause the engine is running stock compression and breaths pretty well it will only make 7-8PSI right?
Andrew Ferres DieHard WA '90 C-F Celsior V8, '84 Soarer V8, '91 Supra V8
Sunday, February 24, 2008 - 08:09 am, by: Andrew Ferres(Peewee)
NFI exactly what the sugar does, but its free, and apparently it works.
Slipping is caused by either a lack of tension (stretched belt and tensioner at max, or tensioner on its way out), or caused by lack of belt wrap on the supercharger (due to poor design).
Richwood Aero recommend you run an 8 rib belt for anything over 10psi, and the M112 comes with an 8rib pulley from factory.
Sunday, February 24, 2008 - 05:29 pm, by: Kim Hunt(Lxtasi)
well i chucked on a new belt and there is really no signs of slipping. i thought there was but i was wrong. i guess its the the engine's breathing that only allows me 7psi
Andrew Ferres DieHard WA '90 C-F Celsior V8, '84 Soarer V8, '91 Supra V8
Sunday, February 24, 2008 - 06:26 pm, by: Kim Hunt(Lxtasi)
unfortunately no i don't, and my M90 I was told by Joel is rebuilt and seems like it. its nice and tight , spins freely and gets on boost really well just doesn't hit full boost.
Sunday, February 24, 2008 - 08:24 pm, by: Kim Hunt(Lxtasi)
Jan Christiansson wrote on Sunday, February 24, 2008 - 06:47 pm:
I have an M90 and my pulley is 62mm (nearly 2.5") and have 9psi boost.
is yours intercooled cause that could make a difference between yours and mine. but that is strange anyways. i will have to ask Joel about this reconditioning of the blower and ask about the clearances. oh ans Jan what is done to your motor?exhaust? intake? come to think of it would a leak in the manifold gasket leak 2-3PSI or would it just lose boost? what would it sound like? cause i sometimes smell a fuel smell which is the exact same as if i smelt the pipe that goes into my manifold. so maybe it has a leak?
I also have big extractors, other Cams, No intercooler, I had a leak at intake gasket I don't know if the boost was down but the car run very rough, Niall found the leak.
Monday, February 25, 2008 - 12:13 am, by: Kim Hunt(Lxtasi)
well only indication that might point to a leak is that if you free rev the engine it will die down and turn off when you get off the throttle.like as if it ain't getting enough air or something. i have this leak testing spray that i'm going to try out tomorrow to see if i can find anything. will get back to you's
Gary Nimmo TryHard WA V8 Supercharged & intercooled
Monday, February 25, 2008 - 10:48 am, by: Gary Nimmo(Gazzasore)
Hi Kim Mine only makes about 7.5 psi I loose a bit through my intercooler Make sure you use Spray on belt slip stuff If you have Leaks somewhere Your engine will run like ••••• Do you have Supercharger headers from Neil if not get some upgrade your exhaust My exhaust is the same as Pete,s http://www.planetsoarer.com/V8Exhaust/V8Exhaust.htm Apart from I have 3 inch stainless cats Mine runs sweet now nice even power Good luck
Monday, February 25, 2008 - 10:52 am, by: Kim Hunt(Lxtasi)
Jan Christiansson wrote on Sunday, February 24, 2008 - 08:35 pm:
I also have big extractors, other Cams, No intercooler, I had a leak at intake gasket I don't know if the boost was down but the car run very rough, Niall found the leak.
Jan how exactly did Niel find the leak? i was using that spray stuff i told you about earlier but i figured that unless it's on boost it wont work cause it indicates by forming bubbles. hopefully you can help me out Jan. thanks
Tuesday, February 26, 2008 - 12:07 am, by: Kim Hunt(Lxtasi)
Gary Nimmo wrote on Monday, February 25, 2008 - 10:48 am:
Hi Kim Mine only makes about 7.5 psi I loose a bit through my intercooler Make sure you use Spray on belt slip stuff If you have Leaks somewhere Your engine will run like ••••• Do you have Supercharger headers from Neil if not get some upgrade your exhaust My exhaust is the same as Pete,s http://www.planetsoarer.com/V8Exhaust/V8Exhaust.htm Apart from I have 3 inch stainless cats Mine runs sweet now nice even power Good luck
oh ok, how much is it meant to make? i will deffinitely invest in some headers. i already have 2 1/2 inch from the cats back but will get the whole thing done. yeh my car doesn't run rough or like •••• at all so i guess i don't have a leak yay! but mine does seem to choke when i take off sometimes. i have to ease on the throttle sometimes but i can always get around it doing it. mine makes sh*t loads of power and torque ( not dyno'd yet. will happen at powercruise and next week)
Miles Baker wrote on Monday, February 25, 2008 - 11:02 am:
Looks to me like the chart is for non-intercooled. You have an intercooler. Boost will be lower but power may be higher. The numbers look right to me.
I believe your M90 is now redlined too. Please go to your nearest ATM and get some cash in preparation for an M112.
oh ok so the boost will be different with an intercooler? makes sense now
Jan Christiansson wrote on Monday, February 25, 2008 - 12:57 pm:
It wasn't Neil who find the leak, it was Niall in Botany and he used some kind of powder.
oh sorry i thought you said Niel. i should read more carefully
well an update for everyone. i shortened all my vacuum and boost lines so that they have only nessesary length and my boost gauge is now reading 8PSI so i dunno maybe there is something going on with the line to the gauge. i also heat wrapped my intercooler pipes to keep heat down and i hope it makes a difference.
is anyone going to NSW PowerCruise?come on i need some support
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