Monday, October 31, 2016 - 10:13 pm, by: John Stafford(Johng12)
I have recently fitted an M90 (first bullet install on a Soarer) and feel it was a good move. Always a bit disappointed with the get up and go of the stock V8, nothing down low. This supercharger fixes that. Not great wheel spinning, axle tromping beast but much more fun.
Because the boost is low (6 lbs) it is not as instant as my WRX manual but when the revs get going over 3, like my WRX then there is lots of lift, so you need to select the low gear if below 30 klm/hr or 2nd gear if you really want to get going under 100 klm/hr. I used 2 gear a lot before fitting the M90 but now only if in a real hurry.
Seems plenty of torque once over 2500 revs.
If you have the money then go for the twin screw, which would have much more down low with more boost possible but this thing gets husling very well. Now a days with cars much faster and more efficient than 25 years ago the V8 would not be in the race without this addition. I read recently that extractors don't make any real difference to M90 on the Soarer V8 but I have found otherwise. Since fitting them (Stainless with ceramic coating) a couple of weeks ago the difference is certainly noticeable, obtaining much better final speed up hill over the same stretch of road, and the sound with no second set of intermediary mufflers is real V8. Great sound especially when boost comes in.
I have the air box enclosed and whole front cut out.
You will need some stiffer suspension to keep it down (I would like some supra modded sway bars one day as even though my gixer drew Bilstein set up is good, it could still do with something else to keep it flatter under hard cornering). A limited slip diff would be great too.
On cruise the economy is better than a standard V8 because the bypass butterfly is small, letting less air in and so less fuel gets used. But when you put the foot down and the small butterfly gets bypassed you really get going and then it uses the fuel for sure.
Hope this helps. the question is what do you want to do with the car? If you want to go racing then the twin screw is for you with better cooling, and the result of much more power when pushed really hard for a while.
If you just want something more responsive that goes a bit better than a well tuned twin turbo six, with more torque and lots of fun then the M90 is still a great choice in my opinion.
Tuesday, November 01, 2016 - 12:35 pm, by: John Stafford(Johng12)
In answer to your personal message to me about the ecu temp sensor being the reason for low torque under 3000 rpm. It did not do anything for me when I replaced my green temp sensor (that is the main one) but when I replaced my little dash temp sensor on my 1991 V8 it solved my cold start issue, later 92 and on did not have cold start like the '91s.
No problem with torque on my car now that the M90 boosts it. It is away like a shot. These V8s are renowned for their ability to rev out after 3000 rpm. Maybe a cam issue?
Wednesday, November 02, 2016 - 09:37 pm, by: Raoul Duke(Hunter)
It will be very interesting to find out what's causing the low down torque loss on my car.
Maybe you have the problem too, but the supercharger masks it so everything is fine?
I've still got to give it a plug wire change. I have a suspicion many people with the low power down low have not changed their plugs and wires in 15 years or more.
I read on the LS400 forums in the USA that these two sensors are doing miracles. Luckily it wasn't a super expensive part to change and swap out, and it really should be done considering most cars are 20+ years old now.
Looking at graphs the 1uz should have plenty of power from 1500rpm, I think it was 300nm by 2000rpm in a linear power delivery with a max of 353nm at 5000rpm. Don't quote me though.
A lot i've been in have been lacking down low. Strange phenomena.
Did you ever do a dyno John? What were your torque figures with the m90? I also agree with the fact extractors will give a further performance gain on top of a supercharger.
John Street DieHard NSW Supercharged 95 v8 , 2015 VW Jetta TDI, 2009 Saab 9-3 Turbo
Thursday, November 03, 2016 - 12:50 pm, by: John Street(Rex2ce)
You need to listen to what you are being told Rauol, before spending unnecessary money.in standard form the 1UZ has very little urge between idle and 2500 rpm, that's why people put superchargers on them to fill that hole with some torque, the repairs you are suggesting are normal maintenance and will make the engine smoother, but not more powerful. Hope this helps
Thursday, November 03, 2016 - 06:16 pm, by: Raoul Duke(Hunter)
I re read some 1uz graphs and it turns out that they are lacking a bit in torque under 3000rpm after all, but I still would have thought they'd be more perky.
Monday, November 07, 2016 - 09:44 am, by: Mike Beck(Gold_40gt)
Raoul Duke wrote on Monday, October 31, 2016 - 08:14 pm:
I'm seriously considering an M90 setup, I don't want to spend too much on it,
I like your lines here.. quite the oxymoron :p
I think M90s are a waste of time, better off with the M112, but even those are iffy with the heat they make, the chargers to use are twin screws, much more efficient and don't need intercoolers like old M units do (roots type), but the cost goes up significantly. ECU and fuel upgrades are also required to get more out of a supercharged setup, again more costs.
If you want more go out of your stock v8 without spending too much throw in a 3UZ-FE 4.3 V8 with a 5 speed auto like I did in mine. 300hp and 435nm, up from 250hp and 353nm, massive performance gain without having to do anything modification wise.
Would make a UZZ31 go from doing average 0-100kph times of mid 7s to mid 5s
Fairly involved electrical work required to make such a setup work, but that was easy for me since I deal with vehicle electronics.
Saturday, December 03, 2016 - 05:48 pm, by: Andrew Brown(Crazyassdrummerboy)
I have been advised by the owner of Bullet superchargers in Brisbane that the best route to take when supercharging a 1uz is to use the HTV range with the Eaton TVS system (Twin Vortices Series)
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