Cchris1109

iTrader: (11)

Hey guys, sorry about the last post but researching more I want to go with a supercharger. Have a couple of questions

1. How well do LT1s and their trannys hold up on the 4.5/6 psi kits
2. What kind of gains for 4.5-6 psi kits should i expect.
3. They fit my car I know, but how hard is it to fit
4. What kind of gas mileage decrease is expected.
5. Summit offers a powerdyne supercharger kit for 2.7k *the 4.5 psi one* should i do it?

bone324

iTrader: (2)

I'm no expert, so correct me if I'm wrong:

1. 4.5 psi is fine for a stock LT1 tuned properly. I still run the stock T56 at 8.5 psi. The 10-bolt could go at any moment though.
2. 85 hp at the crank, 60-70 whp according to this:http://dev3.bydomino.com/lgm/shop/pr...869b0fc4080b02
3. Do a search on this. Most agree they're not too difficult. I don't have the time or ability to do it myself and paid quite a bit to have mine installed professionally.
4. Depends on how you drive, how well it's tuned, and other mods. I could probably get 15-18 mpg on my setup, but usually get between 10-12. You should get better with less boost.
5. That's up to you. You could probably gain 65 whp for less. I haven't found alot of positive reviews for this supercharger: https://ls1tech.com/forums/showthrea...=powerdyne+lt1
https://ls1tech.com/forums/showthrea...=powerdyne+lt1
http://lt1tech.com/cgi-bin/ultimateb...c;f=9;t=002097

EPP

iTrader: (22)

1. How well do LT1s and their trannys hold up on the 4.5/6 psi kits
http://www.exoticperformanceplus.com...tCar.php?car=7
Check out our '95 Formula with an ATI ProCharger.

2. What kind of gains for 4.5-6 psi kits should i expect.
I would go with 8 psi with an ATI ProCharger. With the air to air intercoolers that ATI ProCharger uses, more boost can be run without encountering detonation. We normally see an extra 140 rwhp on our chassis dyno with 8 psi of boost.

3. They fit my car I know, but how hard is it to fit
The LT1 engine is a little harder of an install, but with a little bit of patience it isn't too bad.

4. What kind of gas mileage decrease is expected.
With our dyno tuning, gas mileage with the LT1 cars actually seems to pick up. GM left some fine tuning to be found in the LT1 vehicles to be found when dyno tuning, and many of our customers have found better part throttle fuel mileage, even with the added parasitic loss of running the blower.

5. Summit offers a powerdyne supercharger kit for 2.7k *the 4.5 psi one* should i do it?
No, I wouldn't. The Powerdyne blowers have an internal belt that commonly breaks. Most people who purchase a Powerdyne supercharger are usually sorry with the poor performance gains from them. Bob

Fire67

iTrader: (3)

1) the motor will hold up fine, assuming a proper tune to prevent the possibility of detonation, the tranny however will not. I toasted the clutch packs in three diff 'built' 4L60Es with the powerdyne blower @ 6psi making no more than 360rwhp.
2)See reply #1. Thats all I could get out of 6psi non-intercooled on a stock motor.
3)As long as you dont have TCS, its not to bad. With the Prochargers twin intercoolers the install gets to be somewhat difficult, but still within the realm of the shadetree mechanic.
4) With my stock motor on the Powerdyne, I got 20+mpg on the interstate. With the stock motor and the Procharger D1-sc I still managed damn near 20mpg on the interstate. Around town was a joke with either blower, mainly because of my lead foot though.
5)I wouldnt recommend it. For the money, there are other things you can do to get more power than that Powerdyne will get you. Save some more and get an intercooled Procharger kit. You'll be able to run more boost and make WAY more power than that Powerdyne would ever be capable of.
BTW, the stock motor made 450rwhp and 430 rwtq with a D1-sc, twin intercoolers, and 10psig

T/A KID

iTrader: (12)

Fire67 what pulley combination were you running to make that power with your D1SC??? you say stock motor but did you have boltons too (LT's, exhuast, RR's EWP, ETC.

Fire67

iTrader: (3)

Im not sure the pulley diameters, but I can measure them tonight and check. They are 12 rib, and made 10psi at 6500rpms.
The motor was entirely stock on the inside. Outside- Longtubes, ORY, 4" Mufflex cat-back, Meziere pump, MSD box & coil, NGK TR6ix plugs, 42#injectors (which were maxed out), and Jeremy Formato's tuning on the dyno.
Those injectors hit 100% duty cycle by 5800, while the 450rwhp peak was right at 6500.

T/A KID

iTrader: (12)

Man if you don't care measure those pulley's I have a VRE 383 with LE AFR heads in my shop with my D1SC custom SDCE 8rib tensioner setup with a 4inch OBC FMIC. I have a 7.625 crank pulley and I am going to run a 3.3 on the blower to see about 59000 Blower RPM at 6200 should see around 15lbs on the built motor.
I thought just to have fun for now I could put on the D1SC and run a big Blower pulley 4.25 or so and rev the stock motor to 6000. I only want to see like 5lbs of boost. I could put on the 60lb motrons, and the fuel system.

CHRISPY

DITTO! I ran a 2 core ATI P1 kit on my old 95 Z28. With STOCK internals, stock 3.42s on DR's I ran 11.8@120mph on a 1.90 sixty. Full weight, not even spare/jack removed.

ATI used my car in their advertising back in 97. The kit performed flawlessly for me.

I used an FMU, inline pump and 24# SVO injectors. Given todays tech I would recommend an intank pump, bigger injectors and Lt1 edit.

Before times with blower: 13.1@105mph
After: 11.8@119-120mph

Well worth the money. I ran the kit for 2 and a half years without any problems.

T/A KID

iTrader: (12)

Chrispy how much boost were you seeing??

Just wondering if I can pulley my D1SC to make about 5lbs I have the 7.625 crank pulley, I know it will take a good size blower pulley??

CHRISPY

I was running the 8# kit on my car.

You can run 8#'s safely with a good tune and fuel system mods.

Fire67

iTrader: (3)

Sure, Im gonna try to measure them today when I get home from work. So I'll post up tomorrow with my results.
I know they were 'supposed' to supply 8psi at the factory rev limit of 5750rpm. I just never had the limiter that low, nor paid any attention to the gage when at that rpm, but if it got 10 - 10.5psi at 6500rpm it had to be close to their ratings.

T/A KID

iTrader: (12)

just got off the phone with ATI and they told me to run a 7.00 crank pulley and a 4.5 Blower pulley to see 5lbs on my Bolt-on LT1 reving to 6000 RPM.
When I do the math I get 38266 Blower RPM.

If I put in the 7.625 Crank pulley (that I have) and a 4.5 Blower pulley at 5800RPM. I get 40293. So I am wondering how much boost difference it would be for about 2000 blower RPM???

How long did your setup Run Chrispy if you don't mind me asking??
I don't know if I can get a Dyno tune but I can give owe Ed Wright or Bryan herter (Tune I have now) a call and we can do something.

CHRISPY

Mine ran until I sold it. (About 3 years)

Never even need to change a belt

Fire67

iTrader: (3)

Sorry guys, wasnt able to measure the pulleys last night. I ended up staying at work making an aluminum fan shroud for my car untill 10pm. So I got home, showered, and then promptly passed out. I will get those pulley specs this afternoon.