3rdgen92maro

i was planning on installing a vortec s-trim supercharger on my 91 z28 it has the L98 engine. i was wondering if anyone has done this install and what kind of numbers i will get with a stock motor and is it worth the 3500.00 it costs. any input will be great thanks.

sleepybu

what dose vortec say it'll do

Treys_IROC

ehhh...i dunno, i'd look for one used, i found my procharger for 1700. i think it was worth it but i dont know if i'd pay 3500 bucks for one. As for numbers, i dont know how much boost a vortec s trim puts out. so...

CrazyHawaiian

I've got that kit installed on a stock L98 in a 91Z28. Its the S-Trim V1 kit. I see a max of 6psi boost with the stock pulley setup. The kit uses a secondary inline pump and a FMU using stock 730 ECM w/ stock chip. And it comes with a MSD 6B ignition with timing retard. The kit was installed before I bought the car, so I didnt do the install. Alot of accessories had to be relocated. I dont know if its worth it since I didnt pay retail price for it, kinda came included.

According to Vortech it adds 95hp and 85 ft/lbs of torque to a stock L98. So in theory you should be making around 340hp and 430 ft/lbs at the flywheel. Of course this would depend on how well the engine is running, how it was maintained, and whatever else you might have done as far as mods. I've never dyno'd my car so I cant say I know how much power it makes. I can hang with LS1's but Z06 vettes pull away (not as fast as I thought they would, but they do). My stock 700R4 eventually bit the dust so tranny swap is in progress.

As far as how good it is, I think the Vortech setup is great but I dont think its a good match for the stock L98. With the stock TPI, heads, and cam, the powerband starts to end around 4800rpm. Considering the lag to build boost, you only end up with about 1,500rpm in the strong part of the powerband. Of course it will continue to boost past 4800rpm, but there is a noticable drop in acceleration when going WOT. I think to really take advantage of the Vortech setup you should consider an Intake and Cam change w/ better valvetrain at the least. Heads would make a huge difference. The V1 unit sounds crazy insane. People have described it as sounding like a jet plane. Its very noticable because its very loud. My neighbors hate me.

cisco kid

My 89 Formula 350 has a Vortech S-trim. Combined with headers and cam my car dynoed at 336 rwhp and over 370 lbs or tq. I can beat ls 1's including 04 GTO's. This set up has been reliable and a lot of fun. It is noisy, although I think it sounds kind of neat. The new sq line from Vortech are much quieter. As far as install, the worst part is the instructions because they are tough to follow. The alternator and washer fluid must be relocated which isn't a big deal. $3500 is a lot of money, but man, it's a fun way to spend it!

89ta383sc

When i got my trans am it had headrs, flowmaster exhuast, and a vortech s-trim on it. the car ran 13.5's all day till the trans went out. i ut a t-56 in and it went 13.3's. have you done anything to the tpi intake setup?

3rdgen92maro

thanks for the input. i plan on putting headers, mangnaflow exhaust, and possibly slp runners or a holley stealth ram and do some porting and polishing on the stock L98 heads before i do the supercharger.

CeeDubYa

ProCharger > Vortech. Older technology, oil fed head units, non-intercooled (don't have much faith in their aftercoolers either). If you want to boost your car, do it right. Their kits are a fair amount more money, but heat is an issue, and it's worth spending the extra funds getting it done properly.

D-MANN

what blower would you guys recommend,a v1 or p600b procharger for a mild engine?

Tony89GTA

iTrader: (7)

I have to agree here, with the stock L98 boost comes on after you passed your powerband, A turbo or roots style of blower would be best.

anesthes

iTrader: (12)

I totally dissagree.

I've experimented with a lot of pullys on the vortech setup. A 2.95 pully is perfect match for a TPI car. You'll cross 10-12psi right at shift.

On a lt1/singleplane/etc setup with a healthy cam (>6000rpm shift) a 3.33 pully works outstanding.

Install takes about 4 hours on a rusy old car with stuck bolts.
Time consuming stuff is pulling ps pump pully on and off, punching hole in oil pan, etc. Most everythign else is straight forward.. Extend some wires.

I'm not a fan of the FMU and electronics. Mine went on ebay long ago. But to get you started it's not bad.

-- Joe

anesthes

iTrader: (12)

I've experimented with a front mount IC, and with vortechs air to water on my buddy's 01 cobra.

The air/water setup is a pita to plumb because you need to find location for the water box. Maintenence wise, you need to check the water level regularly. Pump could burn out, etc.

FMIC blocks the radiator, the discharge piping often gets heat soak from the engine bay and you end up with just as high IAT on the outlet as the inlet (or higher).

End result? A air/water setup is gonna make more power. Especially if its routed right. The Vortech Cobra mustang setup is just outstanding. Tight but good stuff.

ATI's thirdgen kit is just lame. If you want to look at a NICE intercooler setup, check out willie's thread on the twin-highflow IC. No more blocking radiator, but I'd still imagine some of the piping would get heat soak.

I ran an intercooler on my '89 for a while and found it wasn't as effective as say it would be on a honda civic. (You have to admit, turbo setups and FMIC just go together on those cars).

Which supercharger setup do you have?

-- Joe

CrazyHawaiian

Definately listen to anesthes, he knows his stuff. I guess dont make the same mistake as me and run the stock pulley on a stock L98. Something definately needs to be changed hehe.

KiLLJ0Y

iTrader: (1)

can we still use the Supercharger if we changed to an LT1 intake?? it sits about 2" lower than the TPI..

anesthes

iTrader: (12)

Just need to modify or fabricate the discharge tube.

-- Joe

KiLLJ0Y

iTrader: (1)

awesome.. with that said..

my engine is basically an LT1 without the opti (using a 93 LT1 Ybody cam) L98 heads with 1.60 exhaust, 1.5 RR, full exhaust, ect..

i also have an LT1 intake, LT1 fuel pump which i heard is double the flow of the TPI pump... and 24# LT1 injectors.. would i still need to go with bigger injectors and a larger fuel pump when using a supercharger? i wouldnt want to use an FMU, i would rather change over to the 749ecm..

NEEDforSPEED

i dont know, should i photoshop it?....

KiLLJ0Y

iTrader: (1)

hahahahaha yeah please?? that would rule.... IT WOULD RULE!!!!