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Engine & DrivetrainDiscussions about the engine and drivetrain of your vehicle.
This is a discussion thread titled "New S/C pulley", within the Engine & Drivetrain forum, part of the Technical & Vehicle Assistance Forums category.
What size pulley do I buy if I want to upgrade the pulley for my supercharged V8? What is the difference in an overdrive and an underdrive pulley and do I need to replace both or only one? I have looked on the ASP website but it is pretty confusing. If I do replace them what else should be replaced to go along with the extra power?
underdrive pulley is larger (accesories) or smaller (crank) for a s/c it would give you less boost. the idea with UD pulleys is to increase HP by reducing parasitic drag on the engine.
a smaller pulley on your s/c will give you more boost. what size? i have no clue ask someone who has done it.
as far as other mods, you can prolly get away with just adding more fuel somehow, this can be done with ECU manipulation, there are many devices for this. (e.g. superchips, a'pex-i s-afcII)
good mods would be to eliminate as many restrictions as possible. start with and intake, exhaust, header, maybe even high flow cats. then if you still want more you can get a MAF sensor, larger throttle body, port/polish intake manifold. forged pistons are good as well.
basically the skies the limit. what do you want from your truck? if all you want is some usable everyday power get the smaller pulley and low restriction intake and full exhaust system.
ASP Racing is the one you need. Call Lee or Candice and they will help you. You can either supply your (or another) stock harmonic balancer (integral pulley) or they will locate and supply (you will pay for it) and they will modify it from a 5.52" diameter to a 5.9" diameter. Their fee is $200 to mod the balancer either way. If you have them buy the balancer, add that cost in. 5.9" will give you approximately 3 more lbs of boost. You can still use the same belt as the dif in diameter isn't much. This will be considered an overdrive pulley becuase it will drive everything upstream at a faster rate, to include the SC, hence, more boost. If you have a 2003 and later SC, it will have a ninth injector that will take care of some of the extra boost, or you could get in touch with the folks that distribute Unichip and go that route, or you could purchase an alcohol injection kit and install to take care of the potential for detonation at the higher boost level. If you go that route, make sure you get one that has a controller based on boost rather than an el-cheapo that is just an on/off switch. Anyway, that's my two cents while it is still fresh in my mind as I just did it this week. Hope it helps.
ASP Racing is the one you need. . . . You can still use the same belt as the dif in diameter isn't much.
I don't agree with this part. I have done the OD pulley mod on mine, and I could BARELY force the LARGER belt on. Tried so hard to use a smaller (stock) belt that I ended up breaking the tensioner pulley clean off.
Also, I would NOT do the OD pulley mod without an upgraded fuel pump (= supra TT fuel pump). The risk of being lean is just too great, although I have not actually checked the AFR before or after my mods. Just MHO.
Aloha
__________________
The Truck: 2003 Tundra Stepside Limited
The Mods: TRD Supercharger, Unichip (. . . removed . . .), Supra Twin Turbo fuel pump, 5.85" Overdrive crank pulley (9 psi), SS Autochrome headers, Flowmaster cat-back, K&N drop-in, Denso Iridium IK22 plugs, Cryo-Frozen Powerslot Rotors, Axxis/PBR Ultimate pads, Stull Billet Grill, Black Headlights, Black/Clear Corners, TRD Boost gague, PLX Wideband O2 sensor / data logging, AFR Dash-mount Gauge, Front 1.5" spacer lift, 1" rear block lift, Hellwig Rear Anti-Sway bar, SOS Rear Disc Conversion, Wet Okole seat covers, Alpine & JL A/V system, Custom dash stereo & guage panel, Secondskin sound dampening, 20" DeModa Authority (black) wheels & 295/45 Toyo Proxes S/Ts
The NEAR Future: A "real" lift kit, "Offroad" tires, Unichip reprogram . . .
The Future: IPT Valve Body mod, HPC Header Coating, Flex-a-Lite electric fans . . .
The Past (Taken Off): SOS 1.5"/3" drop kit, Tokico shocks
AlohaTundra, you are correct concerning the upgraded fuel pump, thanks for weighing in and keeping me straight....my bad, forgot to mention. Interesting that you had trouble with the stock SC belt as mine fit fine. There is only .38" difference between the diameters of the stock and modified pulley and my tensioner accomodated that difference. What belt did you end up having to use?
you can not use the stock sc belt - you need the larger one.
i forget what the size is but can get it to anyone who needs it for the 03'.
i can tell you this, the correct belt should go on and take all the adjustment out of the tensioner pulley ( that means it will be all out of further adjustment),
this is the only way ,once the belt initially streches , that it will fit correct and not slip. it will go on extremely hard but you should not need to pry it on.
Thank you all for your input, it is greatly appreciated. I already have the full stainless TRD duals on the truck and I have SS headers sitting on my floor that are going to be installed this weekend. I also already have the 9th and 10th injectors for the charger installed. I beleive they were put on when the charger went on. I will contact asp and see what they say and I plan on buying the URD computer and supercharger upgrade kit from them as well which I believe includes a larger fuel pump and larger injectors, etc.. What kind of real driving power and torque increase did you notice with the extra 3 lbs?
What package is available for the V8? I thought the URD stuff was designed for the V6 application.
Jason
Quote:
Originally Posted by Tom Coates
Thank you all for your input, it is greatly appreciated. I already have the full stainless TRD duals on the truck and I have SS headers sitting on my floor that are going to be installed this weekend. I also already have the 9th and 10th injectors for the charger installed. I beleive they were put on when the charger went on. I will contact asp and see what they say and I plan on buying the URD computer and supercharger upgrade kit from them as well which I believe includes a larger fuel pump and larger injectors, etc.. What kind of real driving power and torque increase did you notice with the extra 3 lbs?
Thank you all for your input, it is greatly appreciated. I already have the full stainless TRD duals on the truck and I have SS headers sitting on my floor that are going to be installed this weekend. I also already have the 9th and 10th injectors for the charger installed. I beleive they were put on when the charger went on. I will contact asp and see what they say and I plan on buying the URD computer and supercharger upgrade kit from them as well which I believe includes a larger fuel pump and larger injectors, etc.. What kind of real driving power and torque increase did you notice with the extra 3 lbs?
Yeah i dont believe URD makes a V8 application as of yet. Email gadget and i think he will confirm this. The injectors they supply with the kit would most likely have to be bigger than the ones that go with the V6. You could however buy the URD super grip pulley from them...although im not entirely pos if they fit the V8. The URD FTC made by split second will definetly work with your app. Also you should purchase the Walbro 190 fuel pump.
__________________ SR5 V6 4X4 5Spd Modifications Include... ACT performance clutch, Bassani Split Side Duals, Fabtech Shocks and front Coilovers, IS Kit, Grillecraft Grille, BBS Wheels, 285/75/16 Firestone Destination M/T's for wheelin, 20" Enkei RT-6's w 295/50/20's for street , Air Box Mod, Pro Comp Boost GaugeTRD Supercharger, URD Fuel kit, URD 2.2 Pulley ALL GONE - Now Audi S4 Avant
I just got mine today (5.9 overboost crank pulley and proper belt)Thanx Charlie and have the TT Supra fuel pump coming.The fuel pump costs 200 plus shipping.Next thing is to get my Unichip reprogrammed to the same as Glens and Scott's fuel mapping....Then I'll be at the ragged edge of the limits of the mighty Iforce V8 .
__________________
Unichip'd TRD Supercharger & 5.9 Overboost Crank Pulley,TRD Boost guage and Oak color matched pod,TRD LSD,Valvebody Upgrade by IPT in NY, JBA headers,Y pipe, K&N(Evol) SS catback exhaust, Helwig Rear antisway bar, Rear custom Leafpack,TRD Coils,Cornfed Spacers's with Y/B Bilsteins,Westin Outdoorsman Bushbar and Nerf Tubes, TRD Ivan Stewart 16X8 Rims and 285/75/R16 Revo AT tires.Pioneer 5500 MP3 Head unit/Q-Logic sub enclosure with dual crossfire subs/ 700 watts of Crossfire Amps/Bazooka 6.5's and 5.25's in Kickpanels/ CodeAlarm Remote starter/antitheft system.
you can not use the stock sc belt - you need the larger one.
i forget what the size is but can get it to anyone who needs it for the 03'.
i can tell you this, the correct belt should go on and take all the adjustment out of the tensioner pulley ( that means it will be all out of further adjustment),
this is the only way ,once the belt initially streches , that it will fit correct and not slip. it will go on extremely hard but you should not need to pry it on.
is 190lph all that is needed on the v8 as well? i was reading urd's website and it recomended the 190lph for the v6? wondering which one i need.
I don't know the rating for the Supra TT pump, but I would recommend using this part, rather than another aftermarket pump. The hookup is pretty easy and I (and others here) have had good results.
Quote:
Originally Posted by silverTRD
does the s/c come with the 9th injector? and 10th?
For the '03+, yes, the TRD s/c includes a 9th and 10th injector - they are RIGHT next to each other at the very back of the assembly.
Quote:
Originally Posted by silverTRD
are the larger injectors that were spoke of only the 9th and 10th or the engine injectors?
Not sure what you're asking.
Quote:
Originally Posted by silverTRD
also, what spark plugs should i use? (im getting the s/c, unichip, s&s long tubes, 5.9 pulley, and an upgraded fuel pump).
I believe that Toyota recommends Denso Iridium IK22 plugs. That is what I'm using. I have used these plugs in other applications (VW/Audi 1.8Ts) and have had very good results. Not everyone here agrees, however, so you might want to do a search.
FYI, I am running the s/c, TT fuel pump, OD pulley and am right now running withOUT the unichip. I had lots of knocking with the stock fuel pump, and the knocking continued with the Unichip and TT pump. Now I am back to the TRD piggyback ECU and the TT pump (no Unichip) and the knocking is very minimal. My problems with knocking seem to be unique, but you should be aware that the Unichip did not really help, and the fuel pump did. The unichip makes more power, but in my truck I can't use it due to the knocking.
Good luck. Your truck will scream.
__________________
The Truck: 2003 Tundra Stepside Limited
The Mods: TRD Supercharger, Unichip (. . . removed . . .), Supra Twin Turbo fuel pump, 5.85" Overdrive crank pulley (9 psi), SS Autochrome headers, Flowmaster cat-back, K&N drop-in, Denso Iridium IK22 plugs, Cryo-Frozen Powerslot Rotors, Axxis/PBR Ultimate pads, Stull Billet Grill, Black Headlights, Black/Clear Corners, TRD Boost gague, PLX Wideband O2 sensor / data logging, AFR Dash-mount Gauge, Front 1.5" spacer lift, 1" rear block lift, Hellwig Rear Anti-Sway bar, SOS Rear Disc Conversion, Wet Okole seat covers, Alpine & JL A/V system, Custom dash stereo & guage panel, Secondskin sound dampening, 20" DeModa Authority (black) wheels & 295/45 Toyo Proxes S/Ts
The NEAR Future: A "real" lift kit, "Offroad" tires, Unichip reprogram . . .
The Future: IPT Valve Body mod, HPC Header Coating, Flex-a-Lite electric fans . . .
The Past (Taken Off): SOS 1.5"/3" drop kit, Tokico shocks
New S/C pulley
, Air Box Mod, Pro Comp Boost GaugeTRD Supercharger, URD Fuel kit, URD 2.2 Pulley ALL GONE - Now Audi S4 Avant
and have the TT Supra fuel pump coming.The fuel pump costs 200 plus shipping.Next thing is to get my Unichip reprogrammed to the same as Glens and Scott's fuel mapping....Then I'll be at the ragged edge of the limits of the mighty Iforce V8 .
