GTAman

iTrader: (2)

So i'm looking for more power out of my corvette L98. Right now i'm thinking either a turbo set up or a procharger. I'm torn 50/50 between the two because the pros and cons make them dead even. For instance, fitment wise, a turbo set up requires a decent amount of fabrication whereas the procharger is a direct bolt on kit. However, financially, I can get a twin turbo kit from CXracing for $1500 compared to over $5000 for a procharger. If i found a procharger complete kit used for the right price i would pick it up.

So this is my preliminary question: Procharger or Turbo?

HP goal is 500.

Also, my apologies if this has been discussed already. I've been reading turbo threads for the last few hours and i'm full of questions. I'm the kind of guy who weighs all the aspects before going ahead with anything. Thank you!

Clayton91

Im going to guess that's a at the crank goal?

anesthes

iTrader: (12)

What turbo kit are you looking at from cxracing?

I don't know that the single turbo header will work with the 113 heads without some cutting and rewelding. I know my AFR heads had issues on #8 and #6.

-- Joe

Street Lethal

iTrader: (16)

I'm also running a Corvette, but its a '96 w/LT1. I was running a D1SC Procharger for awhile, but that was yanked because I was close to selling the car w/out it. In my opinion, skip the D series, and consider getting an F series Procharger w/the correct pulley for your goal. Turbo's in a C4, although are very doable, are just too much trouble to even bother with, unless you go rear mount, and if you do get an aero charger (self contained turbo)...

http://aerocharger.com/

anesthes

iTrader: (12)

I don't think he owns a Corvette. I think he has a Corvette L98 in his thirdgen.

-- Joe

Street Lethal

iTrader: (16)

Your definitely right Joe, I just now took a glance at his profile to confirm.

If it's going in a 3rd gen, then go turbo and don't look back...

anesthes

iTrader: (12)

Yep. Turbo thirdgen is cool stuff.

-- Joe

Orr89RocZ

iTrader: (20)

To get a crx "kit" to work you'll have tons of time in it and end up spending alot on small parts to get it to work. If you cant fab yourself skip the turbo idea.

500 hp is doable with the blowers. Could find used vortech kits here under 2, and sone prochargers here under 3.5-4g. Not bad. D1 procharger is a great blower. Even the small p1 or whatever could get you near that power. D1 can do 800 hp, no need for anything bigger

GTAman

iTrader: (2)

Wow a lot of responses already! Thanks everyone! I do not have a corvette, just an engine from one ha ha good enough! Anyway, I would like to see 500 hp at the wheels. My main influence is the Trans am GTA "Firefox" experimental car Gm toyed around with back in the day. Sounds like there's a lot of votes for turbo here! I've read quite a few threads this far and saw a LOT of fabrication going on. Unfortunately, I do not have welding experience and the equipment for fabrication of that magnitude. I know there are no die t bolt on kits or else everyone would've bought a kit and have a turbo car by now. Also, for tuning, I still need to get my EBL ECM. Please give me your thoughts! Thank you!

Street Lethal

iTrader: (16)

I am running the EBL-P4, I am extremely impressed with it. Turbo headers are very easy to fabricate, if you can get your hands on a used Edelbrock shorty header setup (headers and y-pipe), then fabricating a single turbo system will be a breeze. That is how I did mine. If you need any help with fabricating or tuning let me know, I'm in Jerzey too...

GTAman

iTrader: (2)

Lethal i though I remembered you. I've been following your thread for a long time! Is the p4 the one based off the 7730 ECM? I remember emailing them and I remember them saying not to get the flash model because I have the older ECM and I have MAF. I have hedman shorties and y pipe on the car now. Not sure if that helps or not. I have to go over your thread and make notes. Thanks!

Street Lethal

iTrader: (16)

Yes, we would just need to do a few repins to the harness (takes a minute) then the EBL Flash will hook right up to the stock connectors. Very very easy hookup, as Rbob made everything a breeze to do. The Hedman shorty headers are perfect, just figure out what turbo you want to run (preferably T4), then get yourself a T4 flange on ebay. The welding is the easy part, just need to line everything up beforehand. While you have the headers off, that is the best time to get that oil return fitting in the oil pan. Don't use the block off plate for the mechanical fuel pump as the return, as at high oil pressures it will cause a back up, and its better you just return it to the oil pan directly...

GTAman

iTrader: (2)

Correction: bob told me the EBL flash would be the best bet for me. He said the p4 would need a total repinning.

Street Lethal

iTrader: (16)

Yes, the differences between the two are minimal in terms of features, but since your terminal connectors are different under the dash leading to the ECM from the stock harness in comparison with the 7730, the EBL Flash is definitely the way to go. If you need any help at all just say the word...

anesthes

iTrader: (12)

If you go turbo, make your manifolds out of mild steel.

Mine are chopped up and re-welded XS-power stainless headers. Even with a tig, my welding on stainless looks like a turd. Unless you weld stainless regularly, just do mild.



-- Joe

GTAman

iTrader: (2)

Hey Guys,

So i just got around to reading the whole thread thouroughly and it seems Turbo is the way to go. It looks like i will be looking into welding classes so i can do quality fab work to fit 2 mean hair driers. i've seen some pics so far and looks like the best way (aesthetically and functionally) is to place them where the battery and the Charcoal canister goes (behind each headlight).

Questions: How big should i go on fuel injectors? also, due to tight spaces, has anyone experimented with oval exhaust tubing for the down pipes?

project89

iTrader: (1)

i have all the materials except header flanges to build a set of twin turbo log headers if ur interested , i can sell u the materials or make u a set of headers







i also have a setup of up and fowards that are 85% complete if u wanted to use those for a twin or single setup, i would use them for a single gt45 setup though that will get u to 500 crank hp easily

luvofjah

iTrader: (2)

BBS is selling Turbo kits... I got a single turbo header, crossover pipe and driver's header for about $900 I think... I got the option to keep my AC (Live in Florida / Black Firebird)... TurboTPI was making 570 rwp with his single turbo BBS header...
EBL P4 here too...

As for the ATI price / power, I would go turbo too...

GTAman

iTrader: (2)

Thanks everyone!

So i did some math to size up my fuel injectors for this project, using a formula i got from accel, and for 500 hp i should be using 47 lb injectors. That sound about right?

Street Lethal

iTrader: (16)

... assuming a BSFC of around .65, and an 80% duty cycle, you will want to run 50lb injectors at a minimum for 500-FWHP. If we're talking RWHP, you will want to run 60lb injectors.

Orr89RocZ

iTrader: (20)

Yup just find some 60lb siemens. Relatively cheap and work fantastic

anesthes

iTrader: (12)

Why are we concerned about going over 80% 'duty cycle' on modern injectors?

-- Joe

Street Lethal

iTrader: (16)

I still try to utilize 80% as a range due to any slight increase in boost pressure that the user wasn't ready or prepared for, from either boost creep, or a flawed boost control system, as it will allow for the user to cover additional kpa if need be. Call it added insurance...

anesthes

iTrader: (12)

I guess. I've had more problems dealing with oversized injectors at idle than I've had running out of fuel up top.

I realize that some of the OE injectors would get erratic at higher duty cycles, but any modern injectors will work properly even static as long as your software is compensating for open and close time.

Running static will of course lead to issues when you suddenly need more fuel, but I've run mid 90% for over a decade with no issues

-- Joe

86trbota

If you decide to build your own kit it is well worth the time and effort. I have about $700 into my whole hotside, headers crossover and downpipe. That includes welding and paint and wrap. I bought header flanges and a open wheel header kit from jegs and started cutting. One thing i have learned is do NOT cheap out the first time it will cost you in the end.

DIGGLER

iTrader: (1)

i built a set like that a long time ago but never used them. when i got finished i realized i had used 18ga. tubing and figured that would never hold up.

86trbota

I bet they would have done ok for a while as long as they dont rust and good bracing. Mine is 16g and only the headers were aluminized i hope it lasts for a while!