***c4 Forced Induction Thread***

[tntcorvette]

Since this thread http://corvetteactioncenter.com/forums/showthread.php?threadid=39845 died, I think it is a good idea to start a thread about forced induction options for the C4 including: SuperChargers, n2o, and turbochargers.

Personally I do not want to run n2o in my car, although the motor was built for it. I would rather have the power there 24/7 versus when the tanks are full, armed, etc, etc, etc.

One thing about superchargers is that they seem to all suffer from belt slip unless you go with a COG drive setup. But on the C4 L98 I do not see how that is possible with the crank pully so close to the p.s. rack and frame brace.

Installing a single turbo on the early L98 cars ('85-'89) would be pretty simple. All that is needed is to move the alternator to where the aim pump was (it would be deleted), and put the turbo in that cavity where the alternator was, then have all the exhaust plumbing stuffed on the driver side, including a 3" down pipe. Heat insulation for the brake lines, brake booster, spark plug wires would be a must. All in all it is possible.

Here is a link to a great turbo website for models, pricing, etc

http://www.precisionte.com/

So what do you guys/gals think?

Hopefully this thread will receive some consistent input from everyone.

 

[UB2 SLOW]

I got a friend who has a 94 LT1. He asked me to do some checking on a Supercharger. Anyone have any suggestions? What all does he need? How much boost can he run?

 

[Mad-Mic]

i found these on doing some research one day from www.SuperchargersOnline.com these were the only 2 that the companies made for L98 Vettes. i'd take the P600B H.O. kit with 12 lbs of boost


ProCharger P600B H.O. Supercharger Kit w/2-Core Intercooler for 85-91 Chevy Corvette TPI (8 psi/10 psi/12 psi Polished)
Part Number: A1GB212-10I
SuperchargersOnline.com*: $3,899.00
List Price: $4596
You Save: $697

ProCharger D-1 H.O. Supercharger Kit w/2-Core Intercooler for 85-91 Chevy Corvette TPI (10+ psi - polished)
Part Number: A1GB212-D1
SuperchargersOnline.com*: $4,049.00
List Price: $4996
You Save: $947

 

[Mad-Mic]

I got a friend who has a 94 LT1. He asked me to do some checking on a Supercharger. Anyone have any suggestions? What all does he need? How much boost can he run?

most likely he can run 8 lbs of boost with the stock long block. anything more he'd have to lower compression to around 8.5.1 to 9.1. and most likely some computer tuning.

 

[Edmond]

I hate to be the party pooper here but looking at those prices of the superchargers for the L98's, you could build a sick stroker motor and save some money. $4000 sounds like it's too much. Then again, maybe I'm saying that because I'm a fan of more cubic inches as opposed to forced induction.:W

 

[Grizzly]

Blower Options

Just a quick look shows Doug Rippie has a 340hp L98 for $6K. I think this at least is a better deal. A friend trashed his L98 with a blower, they just aren't built for boost. Without the boost you don't get the significant HP gains the advertisements talk about.

If you are lucky enought to have an LT 1 Lingenfelter will give you 430 hp for $6k. They even go through the motor which DRM doesn't mention.

If you can do a lot of the work yourself, build a stroker motor, if not these are better options than a blower.

Merry Christmas....................

 

[Mad-Mic]

yes i agree on a built motor before S/C. i've been thinking on going S/C after my build up. i think i can hit 12.0's-12.2's N/A and then i get to a point if i want to go faster. i can always opt miniram but LTR setup has the torque down low. i think i'm gonna go with some juice when i decide to go with a power adder.

 

[rkreigh]

I agree that putting blowers on high compression stock engines may not be the best path to power, however, after running around in both a 500 rwhp ZR1 and a little turbo buick for quite a few years I can tell you that the turbo cars have a ton of potential. just don't expect big durable HP AND cheap.

unfortunately not too many tuners want to mess around with turbos on the c4 because of packaging constraints. its obviously possible, but when you look at the engineering and packaging of the callway cars, it's not simple.

just have a look at the "rogue vette" with a stage II turbo buick engine, the sledgehammer, and Meaney's new 1200 HP c4 and you can see that the turbo cars have a fantastic potential. if the SS manifolds and plumbing and packaging can be worked out in a kit along with pistons and a correct cam, and computer calibration, you really have something.

the blowers build boost at too high an RPM, turbos can be setup to provide BIG low end torque, much more useable HP/torq "under the curve" and make much more power due to the greater CFM flow potential.

how many F1 cars do you see running around with cent blowers???

turbos unfortunately have a bad rap from the early days and clearly are harder to package and tune, but the results are well worth it.

I'm working with SGC on a twin turbo ZR1 project. a handful of these have already been done and they are spectacular!!

hope this is food for thought.

 

[tntcorvette]

The only C4, IMO, that can handle boost with the stock internals is the '85 because it has forged TRW pistons from the factory. The crossfire too, but the intake on that car is too restrictive.

$4K for a stroker, IMO, will not be enough to get you rolling. You still will need intake, exhaust, computer work, etc before it reaches its potential.

Turbo -vs- S/C....good debate here. Some say a S/C can perform just as well, if not better than a turbo car. Mainly the centrifigual s/c that build boost in the compressor housing and not the intake manifold.

 

[Last Ride]

I agree that to get the true potential out of the forced induction application, you need to rebuild the motor to suit the application. I am wanting to do either a twin turbo or a supercharger for my LT1, and after hearing about Gale Banks coming to market with an LT1 "kit", I think the nod is going to twin turbo. I have a little advantage over the average C4 LT1 guy because there is a lot more room in my C3 compartment. I was planning on building a 396 with an 8.5-9.0 compession, forged internals, etc. This would still give me 350-400 horsepower, which sounds pretty tame for such a motor. strap on some hairdryers or a centrifugal, and away we go!

 

[tntcorvette]

I like the idea of turbocharging. In the C4 it is possible to go twin turbo and keep the a/c and stuff. But it will cost like any other project.

The centrifugal s/c can also use a blow off valve to achieve max boost at a lower rpm.

For instance, if you have a supercharger that is making a total of 15lbs of boost @ 5000 rpm, and 10 lbs of boost at 3800 rpms yo ucan use a blow off valve set at 10 lbs of boost and achieve max. boost at a lower rpm.

Great idea. And if I go supercharger its going to have a seperate pully for the s/c and possible a cog setup. With a s/c I would imagine the oil supply line can be fed to a seperate oil resivor vs the oil pan? Say a small box, enough to hold a quart+

I do not see the supercharger generating enough heat to get the oil temp over 130 degrees. Say some good synthetic 5W30 oil.

I would like to see the Gale Banks turbo headers That is also a serious consideration for me.

 

[Last Ride]

I would like to see the Gale Banks turbo headers That is also a serious consideration for me.

Go to Gale Banks and take a look at their new twin turbo performance engines. 800-1600 HP trim lines! Supposedly, the C4 (and C5) systems are going to be derivitive of these systems. The major difference I heard was that the Corvette systems would be mounted low like the Lingenfelter kit.

Bryan

 

[Will]

The only C4, IMO, that can handle boost with the stock internals is the '85 because it has forged TRW pistons from the factory. The crossfire too, but the intake on that car is too restrictive.

The 84 & 85 C4's came with forged pistons from the factory? You lucky duck.
I'm suprised that GM didnt consider that too expensive to do to a production car at that time. But then again I'm a newbie and always suprised. Everythings new to me!
I wonder why they didnt keep doing it to the rest of the L-98's?

 

[l98vette1986]

Nitrous is not Forced induction

 

[topless82vette]

My best friend is going to supercharge his 1990 six speed vette with one of those P600B's. I saw his complete kit and trust me your paying alot for all the relocation stuff to make the system work thats why it has a hefty price tag. His is the twin intercooled version. However, this is what else is going on the car.

396 stroker with ZZ-383 cola crank, Carillo 6 inch rods, forged splay caps, main cap girdle, venolia pistons I believe dished for 8.0 compression, O-ringed block, AFR heads, heavily ported SLP runners and TPIS big mouth base.

For the exhaust he went with TPIS ceramic coated long tubes, 3 inch collector pipes, 3.5 inch high flow cat, 3 inch TPIS catback.

The motor is being built to withstand 12psi-15psi so needless to say it should be a interesting combination when he gets it all together .... What do you all think this car could be capable of in the 1/4?