For those with superchargers...Need technical advice

[Tallowood_Air]

Originally Posted by OrangeCrush

I went with Nelson's tune. I asked about a smaller pulley but they said it wasn't worth it.

Yesterday I raced another H2 and totally pulled on him. I have to tell you, it's not a race car but the supercharger pulls HARD out of the hole.

Tim (TTK on the forum) has the same tune from Nelson and I think he dynoed out at 504 (I think) point is, 500+ at the wheels on a 4 wheel dyno.

Works for me... just gas mileage sucks... it's hard to keep your foot out of it.

500+ RWHP?

c'mon.

[HUMMERcustoms.com/TAZ]

Before I added SC but, with a tune. I had Dynatech catback header system, throttle body spacer, electric fans and all the other stuff I had on it when i did add SC and I ran 400/407 at the wheels using a G-Tech Pro unit. Book said to make 3 to 5 runs and average. I ran 10 passes 5 from each direction and still stunned me. I called support over and over asking them how reliable is this and got different person each call and they said sir please trust the unit. Our units are what NASCAR and NHRA are now going to while running G force tests and preliminary HP and torque check tests etc. They are getting rid of the $10,000 electronic units they had been using for the same purpose.

I was stunned because i new i was chirping wheels before SC. I was running down little foreign rigs with 20lbs. of boost all the carbon fiber the dudes could hang on the ride making them so light it would be easy to blow them over on there backs with a strong wind while parked.

The torque steering was rough before SC and became unreal after SC. With SC on I beat my cousins new 2005 vette late summer after adding SC in a 0 to 60 run. If it had been to 75 or 100MPH he may have run me down. I jumped him so far out of the hole at launch I thought his engine must have died or something. He did not have the upgraded engine package but, whatever a vette runs well period.

People can believe whatever but, these H2's and some better than others, just as in the muscle car days when some built on a certain day it all came together right, the H2 can do more than imagined if pushed and done right. All the wheels pulling get's you moving allot sooner than the others smoking their tires or pedaling the throttle to get their rig to hook up.
It has surprised me for sure looking at these beast. I made a believer out of myself and still have allot of pushing yet to do when i get better.

TAZ

[freytes2004]

Thanks H2BILL
A dyno would be great but I can't seem to find one that is 4wheel capable Diablo Sport told me they took the front driveshaft off on their H2 because they don't have a four wheel dyno to develop a tuner is that something I should do since my choices of dynos are limited?

[H2 Bill]

That would be great. Have them disconnect the front wheel drive and go for the dyno tune.

[OrangeCrush]

Originally Posted by Tallowood_Air

500+ RWHP?

c'mon.

Don't shoot the messenger, I'm just telling you what they said it dynoed at.

I haven't dynoed mine so I couldn't tell ya what it would do. 500 does seem kinda steep but I wasn't there.

Originally Posted by H2 Bill

That would be great. Have them disconnect the front wheel drive and go for the dyno tune.

Isn't there a trick to removing the front driveshaft. I remember when I was having a vibration problem, I removed the frt shaft so I could eliminate one possible source.

Once I removed it, the truck wouldn't go into gear.

If I remember correctly, you have to bypass some plug or something... I can't quite remember... perhaps someone can clue me in.

[HUMMERcustoms.com/TAZ]

If you just unhook driveshaft the rig will not run so you can do a RWD dyno check. It is because of the way the transfer case is designed to put load at 40% front and 60% rear axle.

There usually is a work around everything but, i did not try anymore because the only dyno near me is one axle only and even with stock tires and rims the H2 was to wide for the dynojet.

TAZ