gta324

Hi...

After bending the long bolts that are holding the ATI bracket I decided to build something stronger. This have been working perfect this year, along with a spring loaded tensioner. I also removed the lower "idler" pulley.

gta324

Some more pictures.

gta324

Well since I've had belt slipping problems at high rpm with my 3.45 pulley (procharger spinning around 70-72k) I decided to try to built something better.

So far.........
Spring loaded tension



Adjustable pulley that will give alot more belt wrap.



Belt wrap with 3.45" pulley

I can make the slot for the adj.pulley a little bit longer if needed.

Will start with a 3.75" pulley since I also changed to a 8.25" crank pulley.
The 3.45" will give blower speed at 78k

Dont bother about the looks of the build yet, will make it alot nicer if it works

ericjon262

it's all good, the best builds start with function then work on form.

FSTFBDY

iTrader: (33)

Looking good. Ive always liked your build.

I need to do the same and Take off my bracket and make it alot stiffer for my novi2000.

would be alot easier on my build as I have nothing but the novi2000 hanging off the D.side of my LT1

dennisbernal91z

iTrader: (2)

Can't wait to see what I can copy from this. I don't have the ability to make a whole new bracket like that, but I do have a small MIG,, so I can make support brackets. Do you think if I brace the stock bracket, and install a springs tensioner, and maybe soothe idler, I can get rid of belt slip? I assumed that's what you are going for.

gta324

Well here it is on the car

So far its working good, havent done any WOT passes yet, this thing is a beast and I take the tuning slow step by step.

15psi at 5000rpm so far.................next time I'll push it to 5500 or 6000rpm....

ericjon262

Looking good! I love the belt guard!

gta324

Thx

Will improve the looks during the winter

bonesbrakr

iTrader: (3)

Looks good!!! I think you should sell the first bracket... yes that was a hint.....

ericjon262

I wasn't joking! I really like it!

haisud

415TPI FTW
what mpg you get and how much hp that setup do?

gta324

There are some sharp edges around the nut

MPG....Not sure but according to TP I get 20mpg cruising at 90km/h, havent tuned for max milage so dont know if It can get better

HP...dont know.......

86TA355SR

iTrader: (1)

I have really watched your car over the years and all I can say is...wow, this thing keeps getting better.

I have been thinking of putting my P600B back on, really miss that blower!

Z28ricer

iTrader: (2)

That bracket looks awesome.

gta324

thx!

...over the years many things have changed

See what I will do this winter, chassie upgrades maybe? time will tell........

stateman72

Did you modify the spring tensioner to suit the 12 rib belt or can you buy off the shelf ? Do you have the part number ? I have f1r and will not make more than 5 psi boost. Need more belt tension.thanks

gta324

Hi

Well I modified my tensioner by adding a spacer, seen on picture, then I reused an 12rib idler puller from procharger. Had to make an adapter, there is pictures of it here somewhere in the spring loaded tensioner thread..

But It seems like there is a 12rib tensioner availible for a cumming diesel, see If I can find the part nbr again....

stateman72

I was looking for Cummins part number , i found a thread with a international tensioner but only wide enough for 10 rib after mod. Any help would be great, i've only just purchased this F1R system in the last month and cannot stop belt from slipping . Very dissappointed . Thanks again

gta324

check this number from cummings 3043674....It might be a 12rib....

gta324

some more pictures

compared with stock ATI bracket



Still a bit rough in the design but think it suits the rest of the engine compartment



backside


didnt like the long bolt through the alternator so I modified it

bonesbrakr

iTrader: (3)

Too bad you didnt offer this as a kit. Sure a few people would buy it.....

gta324

the stock setup is not the best if you want to push some boost and I think a high stall speed convertor also put extra stress on the stock setup due to the quick rev up. I actually bent and broke the long bolts that holds the stock bracket when I hade 5k rpm stall speed

Making this was actually rather simple the most is made without any expensive machines/tools.

The only think I have not been abel to do home is to lathe...

/N.

85Iroc-Z

iTrader: (4)

What if you were to just switch out the aluminum procharger bracket for a duplicate one that is made of steel. Would that correct all the problems or does the tensioner still need to be improved upon?

gta324

Actually the P1/d1/F1 bracket isnt that bad. I made a new bracket since I would liketo have more belt wrap and didnt what to "destroy" the procharger one.

Everybody that has a procharger would gain from adding a spring loaded tensioner.

The custom bracket/bracing that holds the plate I made just because I bent the long bolts that holds the bracket in the original set up.

This was a combination of high stall and a misplaced spring loaded tensioner I think. When It flashed and began to pull the spring loaded tensioner made the belt toucht it self and snapped ...... But I would strongly recommend everybody to atleast think of mocking up something like this, its rock solid and a "bolt on".........

formula_novice

iTrader: (1)

Love the bracket GTA! I'm really new to metalworking and was wondering how you made it? I'm guessing 1/2" aluminum, cut on a band-saw and welded with a TIG?

gta324

tnx....

Yes 1/2" aluminium. Well since I dont have a big machine park I had to use angle grinder for cutting . Nothing is TIG welded on this, the adj.plate on the back where the pulley is attached is made of steel.

anesthes

iTrader: (12)

Thank for the link to this.


Right now, I have one made out of 3/8" steel.

Was thinking of going aluminum..

-- Joe

gta324

update

3.85" pulley 15psi at 5000rpm.

no slip, if I use a longer belt I can adjust the pulley down some and get more belt wrap if I need......

Anyone have a bigger pulley? Thinking at 6k rpm the boost maybe will be to high....as I see it know the 3.5" pulley wont be needed.....

Jason Spearman

How does this work so far?

gta324

No problems, only issue I've had is broke the woodruff key on the crank.........

anesthes

iTrader: (12)

Oh boy...

Time for twin key?

-- Joe

gta324

I didnt want to remove the crank so I made a tool and "pinned" the crank like they do on Ls engines.....

anesthes

iTrader: (12)

I didn't realize that was a thing haha. awesome!

-- Joe