chrispapas

I saw this on ebay look

1987RX7guy

iTrader: (3)

umm I am not sure about 10 HP but you should not use an underdrive pully on a street car. just buy the pully from WWW.FC3S.ORG for 20 bux shipped anywhere in the US and be happy

kllntyme

Anything is possible. I haven't added any underdrives to my rex, but when I put them on my old 302 H.O. I felt a noticable diffrence in power. I don't know what the ratios are for those pullies, but the V8 set I had featured a main pully that was half the size of the original. Just keep in mind that if the main is smaller and the dual belt alternator is the stock size then you actually lose rpm on the alt. If you run any electronics or a stereo system you might want to make sure that you won't have a problem.

ViperKillerWannabe

3-5 is more likely from what I understand.

chrispapas

read this http://www.mazdaracing.com/dynotest.htm

ViperKillerWannabe

3 hp and 12lbs of torque. Wow. I think I'm gonna get a set, after I fix my grounding problems...

13bpower

You cant argue with dyno results. You could argue that they did something else inbetween runs, because those numbers are kinda suprising for a stock high miles N/A.

13bpower

It was 14 hp, 10 tq on the dyno sheet posted above

jg1bad10th

I bought this setup for my car.I haven't had a chance to install it yet.I'm going to this weekend because I wanted to see what kind of gains I get before I put my new turbo setup on.I'll post and let you know if I can tell any big difference.

chrispapas

I put it the underdrive pullys in they work great spins up to redline fast

RETed

I really question that dyno sheet.&nbsp Pulleys do very little (i.e. power gain) on these cars.&nbsp The elimination of the 3,800RPM has nothing to do with the pulley, so that makes me very suspicious.


-Ted

jon88se

I certainly didn't feel no 14 hp and 10 lb ft...if these #'s are true than the aluminum flywheel on my NA made the equivalent of 30 hp hehe (i dont think flywheels register power gains on dynos)

ilike2eatricers

so has anybody who has installed pulleys felt some noticable or barely noticable gains?

chrispapas

I did , say 5-7 hp is what I think car starts better to

vectorminds

how hard is it to install the street series pully system (any risks involved and what not... and will i need different belts (might be a good time to replace them anyway, but will they need to be a different size)

Only asking cuz i never really gave it much though till seeing that dyno sheet... which seems preety impressive... and id like to squeeze as much power out of my na as i can...

And i didnt see any install instructions on the mazdaracing website... does anyone have a link for that?

Also... does anyone know how many amps less the alternator will be able to put out?

chrispapas

It took me 45 min I have air tools .the hard part was getting the main pully bolt to let go I had to buy a chain wrench to hold the pully so it would not spin as I turned the bolt not to bad of a job .